10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_______________________________

FORM 10‑K

_______________________________

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

or

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________ to _______________

Commission file number 1-4347

_______________________________

ROGERS CORPORATION

(Exact Name of Registrant as Specified in its Charter)

_______________________________

Massachusetts	06-0513860
(State or Other Jurisdiction of Incorporation or Organization)	(I. R. S. Employer Identification No.)
2225 W. Chandler Blvd., Chandler, Arizona	85224-6155
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s telephone number, including area code: (480) 917-6000

Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, $1 Par Value	New York Stock Exchange
Securities registered pursuant to Section 12(g) of the Act: None

_______________________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes ýNo ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes ¨No ý

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ýNo ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes ýNo ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     ý

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ý	Accelerated filer o	Non-accelerated filer o
Smaller reporting company o	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act)    Yes ¨No ý

The aggregate market value of the voting common equity held by non-affiliates as of June 30, 2018, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $2,026,896,605. Rogers has no non-voting common equity. The number of shares outstanding of common stock as of February 15, 2019 was 18,438,502.

Documents Incorporated by Reference:

Portions of Rogers’ Definitive Proxy Statement for its 2019 Annual Meeting of Shareholders, currently scheduled for May 9, 2019, are incorporated by reference into Part III of this Form 10-K.

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ROGERS CORPORATION

FORM 10-K

December 31, 2018

TABLE OF CONTENTS
Part I
Item 1.	Business	4
Item 1A.	Risk Factors	9
Item 1B.	Unresolved Staff Comments	13
Item 2.	Properties	14
Item 3.	Legal Proceedings	15
Item 4.	Mine Safety Disclosures	16
Part II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	17
Item 6.	Selected Financial Data	18
Item 7.	Management’s Discussion and Analysis of Results of Operations and Financial Position	19
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	34
Item 8.	Financial Statements and Supplementary Data	35
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	82
Item 9A.	Controls and Procedures	82
Item 9B.	Other Information	82
Part III
Item 10.	Directors, Executive Officers and Corporate Governance	83
Item 11.	Executive Compensation	83
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	83
Item 13.	Certain Relationships and Related Transactions, and Director Independence	83
Item 14.	Principal Accountant Fees and Services	83
Part IV
Item 15.	Exhibits, Financial Statement Schedules	83
Item 16.	Form 10-K Summary	85
	Signatures	86

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Part I

Item 1. Business

As used herein, the “Company,” “Rogers,” “we,” “us,” “our” and similar terms include Rogers Corporation and its subsidiaries, unless the context indicates otherwise.

Forward-Looking Statements

This Annual Report on Form 10-K includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Such statements are generally accompanied by words such as “anticipate,” “assume,” “believe,” “could,” “estimate,” “expect,” “foresee,” “goal,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “should,” “seek,” “target” or similar expressions that convey uncertainty as to future events or outcomes. Forward-looking statements are based on assumptions and beliefs that we believe to be reasonable; however, assumed facts almost always vary from actual results, and the differences between assumed facts and actual results could be material depending upon the circumstances. Where we express an expectation or belief as to future results, that expectation or belief is expressed in good faith and based on assumptions believed to have a reasonable basis. We cannot assure you, however, that the stated expectation or belief will occur or be achieved or accomplished. Among the factors that could cause our results to differ materially from those indicated by forward-looking statements are risks and uncertainties inherent in our business including, without limitation:

• failure to capitalize on, volatility within, or other adverse changes with respect to the Company’s growth drivers, including advanced mobility and advanced connectivity, such as delays in adoption or implementation of new technologies;

• uncertain business, economic and political conditions in the United States and abroad, particularly in China, South Korea, Germany, Hungary and Belgium, where we maintain significant manufacturing, sales or administrative operations;

• the ongoing trade policy dispute between the United States and China, as well as adverse changes in trade policy, tariff regulation or other trade restrictions;

• fluctuations in foreign currency exchange rates;

• our ability to develop innovative products and have them incorporated into end-user products and systems;

• the extent to which end-user products and systems incorporating our products achieve commercial success;

• the ability of our sole or limited source suppliers to deliver certain key raw materials, including commodities, to us in a timely manner;

• intense global competition affecting both our existing products and products currently under development;

• failure to realize, or delays in the realization of, anticipated benefits of acquisitions and divestitures due to, among other things, the existence of unknown liabilities or difficulty integrating acquired businesses;

• our ability to attract and retain management and skilled technical personnel;

• our ability to protect our proprietary technology from infringement by third parties and/or allegations that our technology infringes third party rights;

• changes in effective tax rates or tax laws and regulations in the jurisdictions in which we operate;

• failure to comply with financial and restrictive covenants in our credit agreement or restrictions on our operational and financial flexibility due to such covenants;

• the outcome of ongoing and future litigation, including our asbestos-related product liability litigation;

• changes in environmental laws and regulations applicable to our business; and

• disruptions in, or breaches of, our information technology systems.

Our forward-looking statements are expressly qualified by these cautionary statements, which you should consider carefully, along with the risks discussed under the headings “Item 1A. Risk Factors” and “Item 7. Management’s Discussion and Analysis of Results of Operations and Financial Position” and elsewhere in this report, any of which could cause actual results to differ materially from historical results or anticipated results. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, unless required by law.

Overview

Rogers Corporation designs, develops, manufactures and sells high-quality and high-reliability engineered materials and components for mission critical applications. We operate three strategic operating segments: Advanced Connectivity Solutions (ACS), Elastomeric Material Solutions (EMS) and Power Electronics Solutions (PES). The remaining operations, which represent our non-core businesses, are reported in the Other operating segment. We have a history of innovation and have established Innovation Centers for our research and development activities in Chandler, Arizona; Burlington, Massachusetts; Eschenbach, Germany; and Suzhou, China. We are headquartered in Chandler, Arizona.

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Growth Strategy and Recent Acquisitions

Our growth strategy is based upon the following principles: (1) market-driven organization, (2) innovation leadership, (3) synergistic mergers and acquisitions, and (4) operational excellence. As a market-driven organization, we are focused on growth drivers, including advanced mobility and advanced connectivity. More specifically, the key trends currently affecting our business include the increasing use of advanced driver assistance systems and adoption of electric and hybrid electric vehicles in the automotive industry and new technology adoption in the telecommunications industry, including next generation wireless infrastructure. In addition to our focus on advanced mobility and advanced connectivity in the automotive and telecommunications industries, we sell into a variety of other end markets including renewable energy, consumer electronics, aerospace and defense and diverse general industrial applications.

Our sales and marketing approach is based on addressing these trends, while our strategy focuses on factors for success as a manufacturer of engineered materials and components: quality, service, cost, efficiency, innovation and technology. We have expanded our capabilities through organic investment and acquisitions, and we strive to ensure high quality solutions for our customers. We continue to review and re-align our manufacturing and engineering footprint in an effort to attain a leading competitive position globally. We have established or expanded our capabilities in various locations in support of our customers’ growth initiatives.

We seek to enhance our operational and financial performance by investing in research and development, manufacturing and materials efficiencies, and new product initiatives that respond to the needs of our customers. We strive to evaluate operational and strategic alternatives to improve our business structure and align our business with the changing needs of our customers and major industry trends affecting our business.

In executing on our growth strategy, we have completed three strategic acquisitions in the last three fiscal years: (1) in July 2018, we acquired Griswold LLC (Griswold), a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions, (2) in January 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), a custom silicone product development and manufacturing business serving a wide range of high reliability applications, and (3) in November 2016, we acquired DeWAL Industries LLC (DeWAL), a manufacturer of polytetrafluoroethylene and ultra-high molecular weight polyethylene films, pressure sensitive tapes and specialty products for the industrial, aerospace, automotive and electronics markets. Additionally, in August 2018, we acquired a production facility and related machinery and equipment located in Chandler, Arizona from Isola USA Corp (Isola).

Operating Segments

Advanced Connectivity Solutions

Our ACS operating segment designs, develops, manufactures and sells circuit materials and solutions enabling high-performance and high-reliability connectivity for applications in wireless infrastructure (e.g., power amplifiers, antennas, small cells and distributed antenna systems), automotive (e.g., active safety, advanced driver assistance systems, telematics and thermal management), aerospace and defense, connected devices (e.g., mobile internet devices and Internet of Things), wired infrastructure (e.g., computing and IP infrastructure) and consumer electronics. We believe these products have characteristics that offer performance and other functional advantages in many market applications that serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits. Trade names for our ACS products include: RO3000^®, RO4000^®, RT/duroid^®, TMM^®, AD Series^TM and CLTE Series^TM. As of December 31, 2018, our ACS operating segment had manufacturing and administrative facilities in Chandler, Arizona; Rogers, Connecticut; Bear, Delaware; Evergem, Belgium; and Suzhou, China.

Elastomeric Material Solutions

Our EMS operating segment designs, develops, manufactures and sells engineered material solutions for a wide variety of applications and end markets. These include polyurethane and silicone materials used in critical cushioning, sealing and vibration management applications for portable electronics (e.g., smart phones), automotive, aerospace, rail, footwear and printing end markets; customized silicones used in flex heater and semiconductor thermal applications; polytetrafluoroethylene and ultra-high molecular weight polyethylene materials used in wire and cable, pressure-sensitive tapes and automotive applications. We believe these materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers’ products from other commonly available materials. EMS products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs). Trade names for our EMS products include: PORON^®, BISCO^®, DeWAL^®, ARLON^®, DSP^®, Griswold^®, eSORBA^®, XRD^®, HeatSORB™ and R/bak^®.

As of December 31, 2018, our EMS operating segment had administrative and manufacturing facilities in Moosup, Connecticut; Rogers, Connecticut; Woodstock, Connecticut; Bear, Delaware; Carol Stream, Illinois; Narragansett, Rhode Island; Santa Fe Springs, California; Ansan, South Korea; and Suzhou, China. We also own 50% of: (1) Rogers Inoac Corporation (RIC), a joint venture established in Japan to design, develop, manufacture and sell PORON products predominantly for the Japanese market and (2) Rogers INOAC Suzhou Corporation (RIS), a joint venture established in China to design, develop, manufacture and sell PORON products primarily for RIC customers in various Asian countries. INOAC Corporation owns the remaining 50% of both

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RIC and RIS. RIC has manufacturing facilities at the INOAC facilities in Nagoya and Mie, Japan, and RIS has manufacturing facilities at Rogers’ facilities in Suzhou, China.

Power Electronics Solutions

Our PES operating segment designs, develops, manufactures and sells ceramic substrate materials for power module applications (e.g., variable frequency drives, vehicle electrification and renewable energy), laminated busbars for power inverter and high power interconnect applications (e.g., mass transit, hybrid-electric and electric vehicles, renewable energy and variable frequency drives) and micro-channel coolers (e.g., laser cutting equipment). We sell our ceramic substrate materials and micro-channel coolers under the curamik^® trade name, and our busbars under the ROLINX^® trade name. As of December 31, 2018, our PES operating segment had manufacturing and administrative facilities in Evergem, Belgium; Eschenbach, Germany; Budapest, Hungary; and Suzhou, China.

Other

Our Other operating segment consists of elastomer components for applications in ground transportation, office equipment, consumer and other markets; elastomer floats for level sensing in fuel tanks, motors, and storage tanks; and inverters for portable communications and automotive markets. Trade names for our elastomer components include: NITROPHYL^® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR^® elastomer rollers.

Sales and Competition

We sell our materials and components primarily through direct sales channels positioned near major concentrations of our customers in North America, Europe and Asia. We sold to over 5,000 customers worldwide in 2018, primarily OEMs and component suppliers. No individual customer represented more than 10% of our total net sales for 2018; however, there are concentrations of OEM customers in our ACS (Chinese telecommunications equipment manufacturers) and PES (semiconductor and automotive manufacturers) operating segments. Although the loss of any one of our larger customers would require a period of adjustment, during which the results of operations could be materially adversely impacted, we believe that such events could be successfully mitigated over a period of time due to the diversity of our customer base.

We employ a technical sales and marketing approach pursuant to which we work collaboratively to provide design engineering, testing, product development and other technical support services to OEMs that incorporate our engineered materials and components in their products. Component suppliers convert, modify or otherwise incorporate our engineered materials and components into their components for these OEMs in accordance with their specifications. Accordingly, we provide similar technical support services to component suppliers.

We compete primarily with manufacturers of high-end materials, some of which are large, multi-national companies, principally on the basis of innovation, historical customer relationships, product quality, reliability, performance and price, technical and engineering service and support, breadth of product line, and manufacturing capabilities. We also compete with manufacturers of commodity materials, including smaller regional producers with lower overhead costs and profit requirements located in Asia that attempt to upsell their products based principally upon price, particularly for products that have matured in their life cycle. We believe that we have a competitive advantage because of our reputation for innovation, the quality and reliability of our materials and components, and our commitment to technical support and customer service.

Research and Development

We have a history of innovation, and innovation leadership is a key component of our overall business strategy. The markets we serve are typically characterized by rapid technological changes and advances. Accordingly, the success of our strategy is in part dependent on our ability to develop market-leading products, which is primarily driven by efforts in research and development. We are focused on identifying technologies and innovations related to both our current product portfolio as well as initiatives targeted at further diversifying and growing our business. As part of this technology commitment, we have Rogers Innovation Centers at Northeastern University in Burlington, Massachusetts, as well as at our facilities in Chandler, Arizona, Eschenbach, Germany and Suzhou, China. Our Innovation Centers focus on early stages of technical and commercial development of new high-tech materials solutions in an effort to align with market direction and needs.

Patents and Other Intellectual Property

We have many domestic and foreign patents, licenses and have additional patent applications pending related to technology in each of our operating segments. These patents and licenses vary in duration and provide some protection from competition. We also own a number of registered and unregistered trademarks and have acquired and developed certain confidential and proprietary technology, including trade secrets that we believe to be of some importance to our business.

While we believe our patents and other intellectual property provide a competitive advantage to our operating segments, we believe that a significant part of our competitive position and future success will be determined by factors such as the innovative skills, systems and process knowledge, and technological expertise of our personnel; the range of new products we develop; and our customer service and support.

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Manufacturing and Raw Materials

The key raw materials used in our business are as follows: for our ACS operating segment, copper, polymer and polytetraflouroethylene materials; for our EMS operating segment, polyurethane, polytetraflouroethylene, polyethylene, silicone and natural rubber materials; and for our PES operating segment, copper, ceramic and brazing paste materials.

Some of the raw materials used in our business are available through sole or limited-source suppliers. While we have undertaken strategies to mitigate the risks associated with sole or limited source suppliers, these strategies may not be effective in all cases, and price increases or disruptions in our supply of raw materials could have a material adverse impact on our business. For additional information, refer to “Item 1A. Risk Factors.”

Seasonality

Except for some minor seasonality for consumer products, which often aligns with year-end holidays and product launch cycles, the operations of our segments have not been seasonal.

Our Employees

As of December 31, 2018, we employed approximately 3,700 people.

Backlog

Our backlog of firm orders was $152.8 millionas of December 31, 2018, compared to $122.8 millionas of December 31, 2017. The year-over-year increase in backlog was mainly comprised of a $24.1 million increase in the backlog for our PES operating segment, primarily due to overall sales growth in 2018 compared to 2017 and favorable foreign currency fluctuations, in addition to $4.2 million of backlog related to Griswold. The backlog of firm orders is expected to be filled within the next 12 months.

Executive Officers

Our executive officers as of February 20, 2019 were as follows:

Name	Age	Present Position	Year Appointed to Present Position	Other Relevant Positions Held
Bruce D. Hoechner	59	President and Chief Executive Officer, Director, Principal Executive Officer	2011
Michael M. Ludwig	57	Senior Vice President, Chief Financial Officer and Treasurer, Principal Financial Officer	2018	Senior Vice President and Chief Financial Officer, FormFactor, Inc., from May 2011 to March 2018.
Marc J. Beulque	54	Vice President, Global Operations	2016	Vice President, Power Electronics Solutions Operations and Research and Development, Rogers, from June 2013 to April 2016; General Manager, Power Distribution Systems from December 2011 to May 2013. Mr. Beulque was promoted to Vice President, Global Operations in April 2016 and was appointed as an executive officer in February 2018 as a result of an expansion of his responsibility to oversee all global operations of the Company.
Benjamin M. Buckley	46	Vice President and Chief Human Resources Officer	2019	Associate General Counsel and Director of Global Compliance and Integrity, Rogers, from October 2014 to January 2019. President and Chief Executive Officer, Verge America Ltd., from May 2013 to October 2014.
Robert C. Daigle	55	Senior Vice President and Chief Technology Officer	2009
Jeffrey M. Grudzien	57	Senior Vice President and General Manager, Advanced Connectivity Solutions	2017	Vice President, Advanced Connectivity Solutions, Rogers, from February 2012 to February 2017.
Jay B. Knoll	55	Senior Vice President, Corporate Development, General Counsel and Secretary	2017	Vice President and General Counsel, Rogers, from November 2014 to February 2017; Senior Vice President, General Counsel PKC Group Oyj - North America from June 2012 to November 2014.
Helen Zhang	55	Senior Vice President and General Manager, Power Electronics Solutions and President, Rogers Asia	2017	Vice President, Power Electronics Solutions and President, Rogers Asia, Rogers, from May 2012 to February 2017.

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Available Information

We make available on our website (http://www.rogerscorp.com), or through a link posted on our website, free of charge, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, reports filed by our executive officers and directors pursuant to Section 16 of the Securities Exchange Act of 1934, as amended (the Exchange Act), and amendments to those reports filed pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission (SEC). In addition, the SEC maintains an internet site that contains these reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC (http://www.sec.gov).

We also make available on our website, in a printable format, the charters for our Audit Committee, Compensation and Organization Committee, and Nominating and Governance Committee, in addition to our Corporate Governance Guidelines, Bylaws, Code of Business Ethics, Related Party Transactions Policy and Compensation Recovery Policy. Our website is not incorporated into or a part of this Form 10-K.

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Item 1A. Risk Factors

Our business, results of operations and financial position are subject to various risks, including those discussed below, which may affect the value of our capital stock. The risks discussed below are those that we believe are currently the most significant, although additional risks not presently known to us or that we currently deem less significant may also impact our business, results of operations and financial position, perhaps materially.

Failure to capitalize on, volatility within, or other adverse changes with respect to the Company’s growth drivers, including advanced connectivity and advanced mobility, may adversely affect our business.

We derived approximately 25% and 27% of our net sales for the year ended December 31, 2018 from sales relating to the key market growth drivers of advanced connectivity and advanced mobility, respectively. These growth drivers are served by our direct and indirect customers in a variety of end markets, including transportation (specifically including the advanced driver assistance systems and electric and hybrid electric vehicles markets), communications, wireless infrastructure and portable electronics. These growth drivers, as well as specific market and industry trends within them, may be volatile, cyclical and sensitive to a variety of factors, including general economic conditions, technology disruptions, consumer preferences and political priorities. Adverse or cyclical changes to and within these growth drivers, such as delays in adoption or implementation of new technologies, has resulted in, and may continue to result in, reduced demand for certain of our products, production overcapacity, increased inventory levels and related risks of obsolescence, as well as price erosion, ultimately leading to a decline in our operating results. Acceleration within these growth drivers and corresponding rapid increases in demand for certain products may also require us to make significant capital investments or acquisitions in order to increase production levels and to maintain customer relationships and market positions. However, we may not be able to increase our production levels with sufficient speed or efficiency to capitalize on such increases in demand.

We have extensive international operations, and events and circumstances that have general international consequence or specific impact in the countries in which we operate may materially adversely affect our business.

For the year ended December 31, 2018, approximately 72% of our net sales resulted from sales in foreign markets, with approximately 47% and 22% of such net sales occurring in Asia and Europe, respectively. We expect our net sales in foreign markets to continue to represent a substantial majority of our consolidated net sales. We maintain significant manufacturing and administrative operations in China, South Korea, Germany, Hungary and Belgium, and approximately 62% of our employees are located outside the United States. Risks related to our extensive international operations include the following:

• foreign currency fluctuations, particularly in the value of the Euro, the Hungarian forint, the Japanese yen, the Chinese yuan and the South Korean won against the U.S. dollar;

• economic and political instability, due to regional or country-specific events or changes in relations between the United States and the countries in which we operate;

• accounts receivable practices across countries, including longer payment cycles;

• export control or customs matters, the ongoing trade policy dispute between the United States and China and adverse changes in trade policy, tariff regulations or other trade restrictions;

• complications in complying, and failure to comply, with a variety of foreign laws, including due to unexpected changes in the laws or regulations of the countries in which we operate;

• failure to comply with the Foreign Corrupt Practices Act or other applicable anti-corruption laws;

• greater difficulty protecting our intellectual property;

• compliance with foreign employment regulations, as well as work stoppages and labor and union disputes.

The foregoing risks may be particularly acute in emerging markets such as China and India, where our operations are subject to greater uncertainty due to increased volatility associated with the developing nature of the economic, legal and governmental systems of these countries, changes in bilateral and multilateral arrangements with the United States and other governments, and challenges that some multinational customers that are headquartered in emerging markets may have complying fully with United States and other developed market extraterritorial regulations. In addition, our business has been, and may continue to be, adversely affected by the lack of development, or disruptions, of transportation or other critical infrastructure in emerging markets. If we are unable to successfully manage the risks associated with expanding our global business, or to adequately manage operational fluctuations, it may materially adversely affect our business, results of operations and financial position.

Our business is dependent upon our development of innovative products and our customers’ incorporation of those products into end user products and systems that achieve commercial success.

As a manufacturer and supplier of engineered materials and components, our business depends upon our ability to innovate and sell our materials and components for inclusion in other products that are developed, manufactured and sold by our customers. We strive to differentiate our products and secure long-term demand through our engagement with our customers to design in our materials and components as part of their product development processes. The value of any design-in largely depends upon the decision of our customers to manufacture their products or systems in sufficient production quantities, the commercial success of the end product and the extent to which the design of our customers’ products or systems could accommodate substitution of

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competitor products. A consistent failure to introduce new products in a timely manner, achieve design-ins or achieve market acceptance on commercially reasonable terms could materially adversely affect our business, results of operations and financial position. The introduction of new products presents particularly significant business challenges in our business because product development commitments and expenditures must be made well in advance of product sales.

Our dependence on sole or limited source suppliers for certain of our raw materials could materially adversely affect our ability to manufacture products and materially increase our costs.

We rely on sole and limited source suppliers for certain of the raw materials that are critical to the manufacturing of our products. This reliance subjects us to risks related to our potential inability to obtain an adequate supply of required raw materials, particularly given our use of lean manufacturing and just-in-time inventory techniques, and our reduced control over pricing and timing of delivery of raw materials. Our operating results could be materially adversely affected if we were unable to obtain adequate supplies of these materials in a timely manner or if their cost increased significantly.

While we believe we could obtain and qualify alternative sources for most sole and limited source supplier materials if necessary, the transition time could be long, particularly if the change requires us to redesign our systems. Ultimately, we may be unable to redesign our systems, which could further increase delays or prevent us from manufacturing our products at all. Even if a system redesign is feasible, increased costs associated with such a redesign would decrease our profit margins, perhaps materially, if we could not effectively pass such costs along to our customers. Further, it would likely result in production and delivery delays, which could lead to lost sales and damage to our relationships with current and potential customers.

We face intense global competition, which could reduce demand for our products or create additional pricing pressure on our products.

We operate in a highly competitive global environment and compete with domestic and international companies principally on the basis of the following:

• innovation;

• historical customer relationships;

• product quality, reliability, performance and price;

• technical and engineering service and support;

• breadth of product line; and

• manufacturing capabilities.

Our competitors include commodity materials suppliers, which offer product substitutions based mostly on price, and suppliers of alternate solutions, which offer product substitutions or eliminations based mostly on disruptive technology. Furthermore, our customers may engage in internal manufacturing of products that may result in reduced demand for our products. Certain of these competitors have greater financial and other resources than we have and, in some cases, these competitors are well established in specific product niches. We expect that our competitors will continue to improve the design and performance of their products, which could result in the development of products that offer price or performance features superior to our products. If we are unable to maintain our competitive advantage for any reason, demand for our products may be materially reduced, which may adversely affect our business, results of operations and financial position.

We may acquire or dispose of businesses, or engage in other transactions, which expose us to a variety of risks that could materially adversely affect our business operating results and financial position.

From time to time, we have explored and pursued transaction opportunities that we believe complement our core businesses, and we expect to do so again in the future. We have divested and may again consider divesting businesses or assets that we do not regard as part of our core businesses. These transaction opportunities may come in the form of acquisitions, joint ventures, investments, divestitures or other structures. There are risks associated with such transactions, including, without limitation, general business risk, technology risk, market acceptance risk, litigation risk, environmental risk, regulatory approval risk and risks associated with the failure to complete announced transactions. In addition, if we are unsuccessful in integrating any acquired company or business into our operations or if integration is more difficult than anticipated, we may experience disruptions that could harm our business and result in our failure to realize the anticipated benefits of the acquisitions. In the case of acquisitions, we may not be able to discover, during the due diligence process or otherwise, all known and unknown risks associated with the business we are acquiring, including the existence of liabilities. We may spend a significant portion of available cash, incur substantial debt or issue equity securities, which would dilute current shareholders’ equity ownership, to pay for the acquisitions. In the case of divestitures, we may agree to indemnify acquiring parties for known or unknown liabilities arising from the businesses we are divesting. We have incurred, and may in the future incur, significant costs in the pursuit and evaluation of transactions that we do not consummate for a variety of reasons.

As a result, these transactions may not ultimately create value for us or our shareholders and may harm our reputation and materially adversely affect our business, results of operations and financial position.

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Our business may be materially adversely affected if we cannot protect our proprietary technology or if we infringe the proprietary rights of others.

Our proprietary technology supports our ability to compete effectively with other companies, and we seek to protect our intellectual property rights by obtaining domestic and foreign patents, trademarks and copyrights, and maintaining trade secrets for our manufacturing processes. It is possible, however, that our efforts to obtain such protection in the United States and abroad will be unsuccessful or that the protection afforded will not be sufficiently broad to protect our technology.

Even if domestic and foreign laws do grant initial protection to our technology, our competitors or other third parties may subsequently obtain and unlawfully copy, use or disclose our technologies, products, and processes. We believe that the risk of piracy of our technology is particularly acute in the foreign countries in which we operate. In circumstances in which we conclude that our proprietary technology has been infringed, we have pursued, and may again pursue, litigation to enforce our rights. The defense and prosecution of intellectual property infringement suits are both costly and time consuming, even if the outcome is favorable to us. If we are not successful in protecting our proprietary technology or if the protection afforded to us is not sufficiently broad, our competitors may be able to manufacture and offer products substantially similar to our own, thereby reducing demand for our products and adversely affecting our results of operations and financial position. We may also be adversely affected by, and subject to increased competition as a result of, the normal expiration of our issued patents.

Our competitors or other third parties may also assert infringement or invalidity claims against us in the future. In addition to the significant costs associated with such suits, as noted above, an adverse outcome could subject us to significant liabilities to third parties and require us to license rights from third parties or cease selling our products. Any of these events may have a material adverse effect on our business, results of operations and financial position.

The failure to attract and retain specialized technical and management personnel could impair our expected growth and future success.

We depend upon the continued services and performance of key executives, senior management and skilled technical personnel, particularly our sales engineers and other professionals with significant experience in the key industries we serve. Competition for these personnel from other companies, academic institutions and government entities is intense, and our expected growth and future success will depend, in large part, upon our ability to attract and retain these individuals.

As a multinational corporation doing business in the United States and various foreign jurisdictions, changes in tax laws or exposures to additional tax liability could negatively impact our operating results.

As a result of the variability and uncertainty in global taxation, we are subject to a wide variety of tax-related risks, any of which could provoke changes in our global structure, international operations or intercompany agreements, which could materially reduce our net income in future periods or result in restructuring costs, increased effective tax rates and other expenses. Given the global nature of our business, a number of factors may increase our effective tax rates, including:

• decisions to redeploy foreign earnings outside of their country of origin for which we have not previously provided for income taxes;

• increased scrutiny of our transactions by taxing authorities;

• changes in the geographic mix of our profits among jurisdictions with differing statutory income tax rates;

• ability to utilize, or changes in the valuation of, deferred tax assets; and

• changes in tax laws and regulations or issuance of new interpretations of the law applicable to us.

For instance, on December 22, 2017, the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform) was signed into law, making significant changes to the Internal Revenue Code. As a result, we recognized an income tax expense in 2017 and made adjustments to the original estimate in 2018. This tax expense is related to the transition tax on our previously untaxed foreign earnings and the remeasurement of deferred income taxes. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes” to “Item 8. Financial Statements and Supplementary Data.”

The terms of our credit agreement subject us to risks, including potential acceleration of our outstanding indebtedness if we fail to satisfy financial ratios and comply with numerous covenants.

Our credit agreement contains, and any future debt agreements into which we enter may contain, certain financial ratios and certain restrictive covenants that, among other things, limit our ability to incur indebtedness or liens, acquire other businesses, dispose of assets, or make investments. Our ability to make scheduled payments on these borrowings and to satisfy financial ratios may be adversely affected by changes in economic or business conditions beyond our control, while the restrictive covenants to which we are subject may limit our ability to take advantage of potential business opportunities as they arise. Failure to satisfy these financial ratios or to comply with the covenants in our credit agreement would constitute a default. An uncured default with respect to one or more of our covenants could result in outstanding borrowings thereunder being declared immediately due and payable, which may also trigger an obligation to repay other outstanding indebtedness. Any such acceleration of our indebtedness would have a material adverse effect on our cash flows, financial position and results of operations.

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Our credit agreement currently permits us to borrow euro-currency loans that bear interest based on the London interbank offered rate (LIBOR), plus a specified spread. In July 2017, the United Kingdom’s Financial Conduct Authority, which regulates LIBOR, announced that it intends to phase out LIBOR by the end of 2021. LIBOR borrowings may become unavailable before that date, and it is unclear what reference rate might replace it. If LIBOR becomes unavailable, the credit agreement presently provides for the interest rate on our loans to convert to a higher base reference rate plus a spread. Even if we agree with our lenders to amend the credit agreement to identify a new reference rate for borrowings thereunder, this rate may be higher than our present interest rate, thereby causing the cost of our borrowings to increase.

We may be adversely affected by litigation stemming from product liability and other claims.

Our products may contain defects that we do not detect before sale, which may lead to warranty or damage claims against us or product recalls. We are involved in various unresolved legal matters that arise in the ordinary course of our operations, including asbestos-related product liability claims related to our operations before the 1990s. For additional information, refer to “Item 3. Legal Proceedings” and “Note 13 – Commitments and Contingencies” to “Item 8. Financial Statements and Supplementary Data.” We maintain insurance coverage with respect to certain claims, but the policy coverage limits may not be adequate or cover a particular loss. Costs associated with, among other things, the defense of, or settlements or judgments relating to, claims against us that are not covered by insurance or that result in recoveries in excess of insurance coverage may adversely affect our business, results of operations and financial position. Irrespective of insurance coverage, claims against us could divert the attention of our senior management and/or result in reputational damage, thereby adversely affecting our business.

Our projections on the potential exposure and expected insurance coverage relating to our asbestos-related product liability claims are based on a number of assumptions, including the number of new claims to be filed each year, the average cost of disposing of such claims, the length of time it takes to dispose of such claims, coverage issues among insurers and the continuing solvency of various insurance companies, as well as the numerous uncertainties surrounding asbestos litigation in the United States. To the extent such assumptions are inaccurate, the net liabilities that we have recorded in our financial statements may fail to approximate the losses we could suffer in connection with such claims.

We are subject to many environmental laws and regulations as well as potential environmental liabilities that could adversely affect our business.

We are subject to a variety of federal, state, local and foreign laws, rules and regulations related to the use, storage, handling, discharge or disposal of certain toxic, volatile or otherwise hazardous chemicals, gases and other substances used in manufacturing our products. Some of these laws in the United States include the Federal Clean Water Act, Clean Air Act, Resource Conservation and Recovery Act, Comprehensive Environmental Response, Compensation, and Liability Act, Toxic Substances Control Act, and similar state statutes and regulations. In the European Union (EU) we are subject to the EU regulation on Registration, Evaluation, Authorization and Restriction of Chemicals. Compliance with these laws and regulations could require us to incur substantial expenses, including in connection with the acquisition of new equipment. Any failure to comply with present or future environmental laws, rules and regulations could result in criminal and civil liabilities, fines, suspension of production or cessation of certain operations, any of which could have a material adverse effect on our business, results of operations and financial position.

In addition, some environmental laws impose liability, sometimes without fault, for investigating and/or cleaning up contamination on, or emanating from, properties currently or formerly owned, leased or operated by us, as well as for damages to property or natural resources and for personal injury arising out of such contamination. Such liability may be joint and several, meaning that we could be held responsible for more than our share of the liability involved, or even the entire liability. For additional information, refer to “Note 13 – Commitments and Contingencies” to “Item 8. Financial Statements and Supplementary Data.”

A significant disruption in, or breach in security of, our information technology systems or violations of data protection laws could materially adversely affect our business and reputation.

In the ordinary course of business, we collect and store confidential information, including proprietary business information belonging to us, our customers, suppliers, business partners and other third parties and personally identifiable information of our employees. We rely on information technology systems to protect this information and to keep financial records, process orders, manage inventory, coordinate shipments to customers, and operate other critical functions. Our information technology systems may be susceptible to damage, disruptions or shutdowns due to power outages, hardware failures, telecommunication failures and user errors. If we experience a disruption in our information technology systems, it could result in the loss of sales and customers and significant incremental costs, which could materially adversely affect our business.

We may also be subject to security breaches caused by computer viruses, illegal break-ins or hacking, sabotage, or acts of vandalism by disgruntled employees or third parties. The risk of a security breach or disruption, particularly through cyberattack or cyber intrusion, including by computer hackers, foreign governments and cyber terrorists, has increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. Our information technology network and systems have been and, we believe, continue to be under constant attack. Accordingly, despite our security measures or those of our third party service providers, a security breach may occur, including breaches that we may not be able to detect. Security breaches of our information technology systems could result in the misappropriation or unauthorized disclosure of confidential

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information belonging to us or to our customers, suppliers, business partners, employees or other third parties, which could result in our suffering significant financial and reputational damage. If we are unable to protect sensitive information, our customers or governmental authorities could question the adequacy of our security processes and procedures and our compliance with evolving government cyber security requirements for government contractors.

In addition, the processing and storage of certain information is increasingly subject to privacy and data security regulations, and many such regulations are country-specific. The interpretation and application of data protection laws in the United States, Europe, and elsewhere, including the EU General Data Protection Regulation and the California Consumer Privacy Act, are uncertain, evolving and may be inconsistent among jurisdictions. Compliance with these various laws may be onerous and require us to incur substantial costs or to change our business practices in a manner that adversely affects our business, while failure to comply with such laws may subject us to substantial penalties.

Employee benefit cost increases and costs associated with the proposed termination of certain of our pension plans could reduce our profitability.

Our profitability is affected by employee benefit costs, particularly medical, pension and other employee benefits. In recent years, employee medical costs have increased due to factors such as the increase in health care costs in the United States. These factors will continue to put pressure on our business and financial performance, as employee benefit costs continue to escalate. We may not succeed in limiting future cost increases. Continued employee benefit cost increases could have an adverse effect on our results of operations, cash flows and financial position.

We also sponsor various defined benefit pension plans that cover certain employees. Our costs of providing defined benefit pension plans have risen dramatically in recent years, and are dependent upon a number of factors and assumptions that drive our projected liabilities and annual expenses, such as discount rates, the actual and projected rates of return on the plans’ assets, governmental regulation, global equity prices, portfolio composition, mortality rates and required or voluntary contributions to the plans. Changes in assumptions, the inability to grow our pension investments over time to increase the value of the plans’ assets, and other factors relating to worldwide and domestic economic trends and financial market conditions, could all have a negative impact on our pension plans, which could result in an increase in our pension liabilities, a reduction in the funded status of our plan, increases in annual expense recognized related to the plans, and requirements to increase funding for some or all of our defined benefit pension plans, among other factors, all of which could negatively impact our results of operations and financial position.

In October 2017, the Company merged two of its qualified noncontributory defined benefit pension plans (the Merged Plan). The Company currently intends to terminate the Merged Plan and has requested a determination letter from the IRS. The termination of the Merged Plan remains subject to final approval by both management and the IRS. We expect the settlement process to be completed in 2019, but the process for finalizing the termination of the Merged Plan includes compliance with a regulatory review by the IRS and the timing of the resolution of the compliance process may be delayed. Following receipt of approval from the IRS and upon the effectiveness of the termination of the Merged Plan, we plan to distribute the benefits remaining in the Merged Plan. This distribution could have an adverse effect on our results of operations, cash flows and financial position.

Item 1B. Unresolved Staff Comments

None.

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Item 2. Properties

We operate various general offices and manufacturing facilities throughout the United States, Europe and Asia. The following table provides certain information about the principal general offices and manufacturing facilities used by our operating segments:

Location	Floor Space (Square Feet)	Type of Facility	Leased / Owned	Operating Segment
United States
Chandler, Arizona	147,000	Manufacturing	Owned	ACS
Chandler, Arizona	105,100	Manufacturing	Owned	ACS
Chandler, Arizona	100,000	Manufacturing	Owned	ACS
Chandler, Arizona	75,000	Administrative Offices	Owned	All
Chandler, Arizona	17,000	Warehouse / Administrative Offices	Leased through 3/2020	ACS
Rogers, Connecticut	388,100	Manufacturing / Administrative Offices	Owned	All
Moosup, Connecticut	185,500	Manufacturing	Owned	EMS
Woodstock, Connecticut	150,600	Manufacturing	Owned	EMS
Carol Stream, Illinois	216,600	Manufacturing	Owned	EMS
Bear, Delaware	125,000	Manufacturing / Administrative Offices	Owned	ACS & EMS
Burlington, Massachusetts	6,000	R&D Lab / Administrative Offices	Leased through 2/2021	All
Narragansett, Rhode Island	84,600	Manufacturing	Owned	EMS
North Kingston, Rhode Island	10,000	Warehouse	Leased through 3/2020	EMS
Santa Fe Springs, California	42,000	Manufacturing / Administrative Offices	Leased through 3/2019	EMS
Europe
Eschenbach, Germany	149,000	Manufacturing / Administrative Offices	Leased through 6/2021	PES
Eschenbach, Germany	24,100	Warehouse / Administrative Offices	Leased through 3/2020	PES
Eschenbach, Germany	1,050	Warehouse	Leased through 3/2020	PES
Evergem, Belgium	122,000	Manufacturing / Administrative Offices	Owned	ACS & PES
Evergem, Belgium	55,700	Warehouse / Administrative Offices	Leased through 5/2021	ACS & PES
Ghent, Belgium	45,000	Warehouse	Leased through 3/2020	ACS & EMS
Budapest, Hungary	64,000	Manufacturing	Leased through 2/2023	PES
Asia
Suzhou, China	821,000	Manufacturing / Administrative Offices	Owned	All
Ansan, South Korea	40,000	Manufacturing	Leased through 10/2021	EMS

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Item 3. Legal Proceedings

Asbestos Products Litigation

We, like many other industrial companies, have been named as a defendant in a number of lawsuits filed in courts across the country by persons alleging personal injury from exposure to products containing asbestos. We were a defendant in 745 asbestos-related product liability cases as of December 31, 2018, compared to 687 cases as of December 31, 2017, with the change reflecting new cases, dismissals, settlements and other dispositions. We have never mined, milled, manufactured or marketed asbestos; rather, we made and provided to industrial users a limited number of products that contained encapsulated asbestos, but we stopped manufacturing these products in the late 1980s. In virtually all of the cases against us, the plaintiffs are seeking unspecified damages above a jurisdictional minimum against multiple defendants who may have manufactured, sold or used asbestos-containing products to which the plaintiffs were allegedly exposed and from which they purportedly suffered injury. Most of these cases are being litigated in Illinois, Maryland, Missouri and New York; however, we are also defending cases in other states. We intend to vigorously defend these cases, primarily on the basis of the plaintiffs’ inability to establish compensable loss as a result of exposure to our products. As of December 31, 2018, the estimated liability and estimated insurance recovery for all current and future claims projected through 2058 was $70.3 million and $63.8 million, respectively.

The defense and settlement costs of our asbestos-related product liability litigation to date have been substantially covered by insurance. As of December 31, 2018, our consolidated statements of financial position include approximately $6.5 million of estimated asbestos-related expenses that exceed asbestos-related insurance coverage for all current and future claims projected through 2058. For additional information regarding our asbestos-related product liability litigation, refer to “Note 13 – Commitments and Contingencies” to “Item 8. Financial Statements and Supplementary Data.”

Other Matters

We are currently involved in a variety of other legal proceedings that we view as ordinary routine litigation incidental to our business, including commercial disputes, intellectual property matters, personal injury claims, tax claims and employment matters. Although the outcome of no legal matter can be predicted with certainty, we do not believe that the outcome of any of these legal proceedings, either individually or in the aggregate, will have a material adverse effect on our business, results of operations, cash flows or financial position. In addition, we are involved in certain environmental matters, principally investigations, which we do not view as material legal proceedings, either pending or known to be contemplated. For additional information regarding these matters, refer to “Note 13 – Commitments and Contingencies” to “Item 8. Financial Statements and Supplementary Data.”

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Item 4. Mine Safety Disclosures

Not applicable.

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Part II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Capital Stock Market Prices and Dividend Policy

Our capital stock is traded on the New York Stock Exchange under the symbol “ROG”. As of the end of business on February 15, 2019, we had 312 shareholders of record. On the same date, the trading price of our capital stock closed at $136.05 per share.

We expect to maintain a policy of emphasizing longer-term growth of capital rather than immediate dividend income and do not anticipate paying cash dividends in the foreseeable future.

Performance Graph

The following graph compares the cumulative total return on Rogers’ capital stock over the past five fiscal years with the cumulative total return on the Standard & Poor’s Industrials Index (S&P Industrials) and the S&P Small Cap 600 Electronic Equipment, Instruments & Components Index. The graph tracks the performance of a $100 investment in the Company’s common stock and in each of the indexes (with the reinvestment of all dividends) on the date specified.

Issuer Purchases of Equity Securities

In 2015, we initiated a share repurchase program (the Program) of up to $100.0 million of the Company’s capital stock. We initiated the Program to mitigate dilutive effects of stock option exercises and vesting of restricted stock units granted by the Company, in addition to enhancing shareholder value. The Program has no expiration date, and may be suspended or discontinued at any time without notice.

During the year ended December 31, 2018, we made $3.0 million of repurchases using cash from operations and cash on hand. As of December 31, 2018, $49.0 million remained available to purchase under the Program. For additional information regarding share repurchases, refer to “Note 21 – Share Repurchases” to “Item 8. Financial Statements and Supplementary Data.”

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Item 6. Selected Financial Data

(Dollars in thousands, except per share amounts)	2018			2017			2016			2015			2014
Financial Results
Net sales	$	879,091		$	821,043		$	656,314		$	641,443		$	610,911
Income before income tax expense	$	110,589		$	132,925		$	82,280		$	66,173		$	81,224
Net income	$	87,651		$	80,459		$	48,283		$	46,320		$	53,412
Per Share Data
Basic earnings per share	$	4.77		$	4.43		$	2.68		$	2.52		$	2.94
Diluted earnings per share	$	4.70		$	4.34		$	2.65		$	2.48		$	2.86
Book value	$	46.12		$	41.99		$	35.28		$	32.55		$	31.91
Financial Position
Current assets	$	485,786		$	454,523		$	458,401		$	428,665		$	438,174
Current liabilities	$	107,180		$	113,808		$	101,185		$	78,648		$	120,445
Ratio of current assets to current liabilities	4.5 to 1			4.0 to 1			4.5 to 1			5.5 to 1			3.6 to 1
Cash and cash equivalents	$	167,738		$	181,159		$	227,767		$	204,586		$	237,375
Net working capital	$	378,606		$	340,715		$	357,216		$	350,017		$	317,729
Property, plant and equipment, net	$	242,759		$	179,611		$	176,916		$	178,661		$	150,420
Total assets	$	1,279,344		$	1,125,134		$	1,056,500		$	930,355		$	840,435
Borrowings under revolving credit facility	$	228,482		$	130,982		$	235,877		$	173,557		$	25,000
Shareholders’ equity	$	848,324		$	766,573		$	635,786		$	584,582		$	587,281
Borrowings under revolving credit facility as a percentage of shareholders’ equity	26.9		%	17.1		%	37.1		%	29.7		%	4.3		%
Other Data
Depreciation and amortization	$	50,073		$	44,099		$	37,847		$	34,054		$	26,268
Research and development expenses	$	33,075		$	29,547		$	28,582		$	27,644		$	22,878
Capital expenditures	$	90,549		$	27,215		$	18,136		$	24,837		$	28,755
Number of employees (approximate)	3,700			3,400			3,100			2,800			2,800
Net sales per employee	$	238		$	241		$	212		$	229		$	218
Number of shares outstanding at year end	18,395			18,255			18,021			17,957			18,403

Amounts disclosed above for 2014 have been adjusted for our 2015 change in accounting principle from the last in, first out (LIFO) cost method to the first in, first out (FIFO) cost method for valuing inventory for all operations that were using the LIFO cost method. The financial data included within the preceding table should be read in conjunction with our Management’s Discussion and Analysis of Results of Operations and Financial Position as well as the Financial Statements and Supplementary Data included in Items 7 and 8, respectively, of this Form 10-K, and with our previously filed Forms 10-K.

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Item 7. Management’s Discussion and Analysis of Results of Operations and Financial Position

The following discussion and analysis of our results of operations and financial position should be read together with the Selected Financial Data and our Consolidated Financial Statements and the related notes that appear elsewhere in this Form 10-K.

Business Overview

Rogers Corporation designs, develops, manufactures and sells high-quality and high-reliability engineered materials and components for mission critical applications. We operate three strategic operating segments: Advanced Connectivity Solutions (ACS), Elastomeric Material Solutions (EMS) and Power Electronics Solutions (PES). The remaining operations, which represent our non-core businesses, are reported in the Other operating segment. We have a history of innovation and have established Innovation Centers for our research and development activities in Chandler, Arizona; Burlington, Massachusetts; Eschenbach, Germany and Suzhou, China. We are headquartered in Chandler, Arizona.

Growth Strategy and Recent Acquisitions

Our growth strategy is based upon the following principles: (1) market-driven organization, (2) innovation leadership, (3) synergistic mergers and acquisitions, and (4) operational excellence. As a market-driven organization, we are focused on growth drivers, including advanced mobility and advanced connectivity. More specifically, the key trends currently affecting our business include the increasing use of advanced driver assistance systems and adoption of electric and hybrid electric vehicles in the automotive industry and new technology adoption in the telecommunications industry, including next generation wireless infrastructure. In addition to our focus on advanced mobility and advanced connectivity in the automotive and telecommunications industries, we sell into a variety of other end markets including renewable energy, consumer electronics, aerospace and defense and diverse general industrial applications.

Our sales and marketing approach is based on addressing these trends, while our strategy focuses on factors for success as a manufacturer of engineered materials and components: quality, service, cost, efficiency, innovation and technology. We have expanded our capabilities through organic investment and acquisitions, and we strive to ensure high quality solutions for our customers. We continue to review and re-align our manufacturing and engineering footprint in an effort to attain a leading competitive position globally. We have established or expanded our capabilities in various locations in support of our customers’ growth initiatives.

We seek to enhance our operational and financial performance by investing in research and development, manufacturing and materials efficiencies, and new product initiatives that respond to the needs of our customers. We strive to evaluate operational and strategic alternatives to improve our business structure and align our business with the changing needs of our customers and major industry trends affecting our business.

In executing on our growth strategy, we have completed three strategic acquisitions in the last three fiscal years: (1) in July 2018, we acquired Griswold LLC (Griswold), a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions, (2) in January 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), a custom silicone product development and manufacturing business serving a wide range of high reliability applications, and (3) in November 2016, we acquired DeWAL Industries LLC (DeWAL), a manufacturer of polytetrafluoroethylene and ultra-high molecular weight polyethylene films, pressure sensitive tapes and specialty products for the industrial, aerospace, automotive and electronics markets. Additionally, in August 2018, we acquired a production facility and related machinery and equipment located in Chandler Arizona from Isola USA Corp (Isola).

2018 Executive Summary

In 2018 as compared to 2017, our net sales increased7.1% to $879.1 million, gross margin decreased approximately 340 basis points to 35.4%, and operating income as a percentage of net sales decreased approximately 290 basis points to 12.8%. The following key factors should be considered when reviewing our results of operations, financial position and liquidity for the periods discussed:

• Our net sales increase in 2018 was attributable to increases in net sales in our EMS and PES strategic operating segments. Net sales were favorably impacted by higher net sales in electric and hybrid electric vehicle and micro-channel cooler applications in our PES operating segment and higher net sales in portable electronics and automotive applications in our EMS operating segment, partially offset by lower net sales in wireless 4G LTE and portable electronics applications in our ACS operating segment. The increase in net sales was also driven in part by net sales of $13.7 million, or 1.7%, related to our acquisition of Griswold, as well as $15.5 million, or 1.9%, of favorable impacts from appreciation in value of the Euro and Renminbi relative to the U.S. dollar. The adoption of new accounting guidance for revenue recognition favorably impacted net sales in 2018 by $4.6 million, or 0.6%.

• Our gross margin decreased approximately 340 basis points to 35.4% in 2018 from 38.8% in 2017. Gross margin was unfavorably impacted as a result of strategic investments in capacity optimization and infrastructure to support future growth initiatives, increased costs for raw materials, facility consolidation and new product launch, as well as unfavorable

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absorption of fixed costs. The adoption of new accounting guidance for revenue recognition favorably impacted gross margin in 2018 by $1.5 million, or 0.5%.

• Our operating income decreased12.7% to $112.7 million in 2018, as compared to $129.1 million in 2017. The decrease was primarily due to a decrease in gross margin, as well as a $2.4 millionincrease in selling, general & administrative (SG&A) expenses and a $3.5 millionincrease in research and development (R&D) expenses, furthered by a decrease in other operating income of $2.2 million. The increase in SG&A expenses was driven by increases in acquisition expenses as well as other intangible assets amortization related to Griswold. SG&A expenses decreased as a percentage of net sales from 19.7% in 2017 to 18.7% in 2018. The decrease in other operating income was primarily due to the $3.5 million of depreciation expense on leased assets netted against the $0.9 million of imputed income related to the Isola asset acquisition.

• We are an innovation company, and in 2018 we continued our investment in R&D, with R&D expenses comprising 3.8% of net sales, an increase of approximately 20 basis points from 2017. R&D expenses were $33.1 million in 2018, as compared to $29.5 million in 2017. We have made concerted efforts to realign our R&D organization to better fit the expected future direction of our Company, including dedicating resources to focus on current product extensions and enhancements to meet our expected short-term and long-term technology needs.

• We acquired Griswold in July 2018, as we continue to execute on our synergistic acquisition strategy. Acquisitions are a core part of our growth strategy, and the Griswold acquisition extends the product portfolio and technology capabilities of our EMS operating segment. We financed our acquisition of Griswold with $82.5 million in borrowings under our revolving credit facility. As a result, borrowings under our revolving credit facility increased in 2018.

• In preparation for expected demand in advanced connectivity and advanced mobility, we acquired a production facility and related machinery and equipment from Isola in August 2018. We intend to use the purchased assets for capacity expansion within our ACS operating segment in contemplation of expected future demand from our 5G customers. We financed the asset acquisition with $43.4 million in cash on hand.

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Results of Operations

The following table sets forth, for the periods indicated, selected operations data expressed as a percentage of net sales.

	2018		2017		2016
Net sales	100.0	%	100.0	%	100.0	%
Gross margin	35.4	%	38.8	%	38.0	%
Selling, general and administrative expenses	18.7	%	19.7	%	21.2	%
Research and development expenses	3.8	%	3.6	%	4.4	%
Restructuring and impairment charges	0.5	%	0.4	%	0.1	%
Other operating (income) expense, net	(0.4	)%	(0.6	)%	—	%
Operating income	12.8	%	15.7	%	12.3	%
Equity income in unconsolidated joint ventures	0.6	%	0.6	%	0.6	%
Other income (expense), net	(0.1	)%	0.6	%	0.2	%
Interest expense, net	(0.7	)%	(0.7	)%	(0.6	)%
Income before income tax expense	12.6	%	16.2	%	12.5	%
Income tax expense	2.6	%	6.4	%	5.1	%
Net income	10.0	%	9.8	%	7.4	%

2018 vs. 2017

Net Sales
(Dollars in thousands)	2018		2017		Percent Change
Net sales	$	879,091	$	821,043	7.1%

Net sales increased by 7.1% in 2018 compared to 2017. Our EMS and PES operating segments had net sales increases of 9.2% and 20.8%, respectively, while our ACS operating segment had a net sales decrease of 2.3%. The increase in net sales was favorably impacted by higher net sales in electric and hybrid electric vehicles and micro-channel cooler applications in our PES operating segment and higher net sales in portable electronics and automotive applications in our EMS operating segment, partially offset by lower net sales in wireless 4G LTE and portable electronics applications in our ACS operating segment. The increase in net sales was also driven in part by net sales of $13.7 million, or 1.7%, related to our acquisition of Griswold, as well as $15.5 million, or 1.9%, of favorable currency fluctuations due to the appreciation in value of the Euro and Renminbi relative to the U.S. dollar. The adoption of new accounting guidance for revenue recognition favorably impacted net sales in 2018 by $4.6 million, or 0.6%. For additional information regarding the impacts of adoption of new accounting guidance for revenue recognition, refer to “Note 16 – Revenue from Contracts with Customers,” as well as “Note 15 – Operating Segment and Geographic Information” to “Item 8. Financial Statements and Supplementary Data.”

Gross Margin
(Dollars in thousands)	2018			2017			Percent Change
Gross margin	$	310,783		$	318,575		(2.4)%
Percentage of net sales	35.4		%	38.8		%

Gross margin as a percentage of net sales decreased approximately 340 basis points to 35.4% in 2018 compared to 38.8% in 2017. Gross margin in 2018 was unfavorably impacted by strategic investments in capacity optimization and infrastructure to support future growth initiatives, increased costs for raw materials, facility consolidation and new product launch, as well as unfavorable absorption of fixed costs. The adoption of new accounting guidance for revenue recognition favorably impacted gross margin in 2018 by $1.5 million, or 0.5%.

Selling, General and Administrative Expenses
(Dollars in thousands)	2018			2017			Percent Change
Selling, general and administrative expenses	$	164,046		$	161,651		1.5%
Percentage of net sales	18.7		%	19.7		%

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SG&A expenses increased1.5% in 2018 from 2017, due to a $2.0 million increase in other intangible assets amortization and a $0.5 million increase in acquisition expenses year-over-year. SG&A expenses were also unfavorably impacted by increases in sales and marketing investments to support future growth initiatives and other SG&A expenses, which were almost completely offset by decreases in total compensation and benefits. The total year-over-year increase in other SG&A expenses was favorably impacted by cost control initiatives executed in the fourth quarter. SG&A expenses decreased as a percentage of net sales to 18.7% in 2018 from 19.7% from 2017.

Research and Development Expenses
(Dollars in thousands)	2018			2017			Percent Change
Research and development expenses	$	33,075		$	29,547		11.9%
Percentage of net sales	3.8		%	3.6		%

R&D expenses increased11.9% in 2018 from 2017 due to concerted efforts to realign our R&D organization to better fit the expected future direction of our Company, including dedicating resources to focus on current product extensions and enhancements to meet our expected short-term and long-term technology needs. R&D expenses increased as a percentage of net sales to 3.8% in 2018 from 3.6% from 2017.

Restructuring and Impairment Charges and Other Operating (Income) Expense, Net
(Dollars in thousands)	2018			2017			Percent Change
Restructuring and impairment charges	$	4,038		$	3,567		13.2%
Other operating (income) expense, net	$	(3,087	)	$	(5,329	)	(42.1)%

We incurred restructuring charges associated with the relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona and the consolidation of our Santa Fe Springs, California operations into the Company’s facilities in Carol Stream, Illinois and Bear, Delaware. We recognized $2.0 million and $0.6 million of restructuring charges associated with the facility consolidation and our global headquarters relocation, respectively, in 2018, and $2.8 million of restructuring charges related to the global headquarters relocation in 2017. We did not recognize any restructuring charges related to the facility consolidation in 2017. We estimate that approximately $0.5 million of additional costs related to the facility consolidation will be incurred in 2019.

In 2018, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition, which was allocated to our ACS operating segment. In 2017, we recognized a $0.3 million impairment charge related to our remaining investment in BrightVolt, Inc. and recognized a $0.5 million impairment charge related to the remaining net book value of an other intangible asset within our ROLINX^® product line in our PES operating segment. The impairment of our remaining investment in BrightVolt, Inc. was allocated ratably among the three operating segments, while the impairment of the ROLINX^® related other intangible asset was allocated to our PES operating segment.

In 2018, we recognized lease income of approximately $0.9 million and related depreciation expense on leased assets of approximately $3.5 million in connection with the transitional leaseback of a portion of the facility and certain machinery and equipment acquired from Isola in August 2018. We recorded a gain from the settlement of antitrust litigation in the amount of $4.2 million, a gain of $0.7 million for the settlement of indemnity claims related to the DSP acquisition, income of $0.6 million from economic incentive grants related to the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona and a gain on sale of property, plant and equipment of $0.2 million. In 2017, we recognized other operating income of $5.3 million as a result of the sales of a facility and a parcel of land located in Belgium. For additional information related to the year-over-year changes in other operating income (expense), refer to “Note 18 – Supplemental Financial Information” to “Item 8. Financial Statements and Supplementary Data.”

Equity Income in Unconsolidated Joint Ventures
(Dollars in thousands)	2018		2017		Percent Change
Equity income in unconsolidated joint ventures	$	5,501	$	4,898	12.3%

Equity income in unconsolidated joint ventures increased12.3% in 2018 from 2017 due to higher demand, primarily in portable electronics applications.

Other Income (Expense), Net
(Dollars in thousands)	2018			2017		Percent Change
Other income (expense), net	$	(994	)	$	5,019	(119.8)%

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Other income (expense), net decreased119.8% in 2018 from 2017 due to declines in the value of our copper derivatives and foreign exchange contracts, as well as unfavorable changes in foreign currency transaction costs.

Interest Expense, Net
(Dollars in thousands)	2018			2017			Percent Change
Interest expense, net	$	(6,629	)	$	(6,131	)	8.1%

Interest expense, net, increased by 8.1% in 2018 from 2017 due to higher interest rates, partially offset by a lower average outstanding balance on our revolving credit facility in 2018 compared to 2017. The lower average outstanding balance was a result of discretionary payments of $50.0 million and $60.0 million during the second and third quarters of 2017, respectively, to reduce our outstanding borrowings under our revolving credit facility, largely offset by new borrowings under our revolving credit facility during the third quarter of 2018 to fund our acquisition of Griswold and our voluntary pension contribution in connection with the proposed plan termination process.

Income Tax Expense
(Dollars in thousands)	2018			2017			Percent Change
Income tax expense	$	22,938		$	52,466		(56.3)%
Effective tax rate	20.7		%	39.5		%

Our effective income tax rate for 2018 was 20.7% compared to 39.5% for 2017. The 2018 rate decrease was primarily due to a lower U.S. statutory tax rate in 2018 and the absence of the one-time impact from the enactment of the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform) in 2017, an increase in reversal of reserves associated with uncertain tax positions and lower foreign tax impact on remitted and unremitted foreign earnings and profits.

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and developments credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes” to “Item 8. Financial Statements and Supplementary Data.”

2017 vs. 2016

Net Sales
(Dollars in thousands)	2017		2016		Percent Change
Net sales	$	821,043	$	656,314	25.1%

Net sales increased by 25.1% in 2017 compared to 2016. This increase was driven by the net sales from our acquisitions of DeWAL and DSP, as well as higher organic net sales in our three strategic operating segments (ACS, EMS and PES). The ACS operating segment had an increase in net sales of 8.4% due to higher end-market demand in automotive radar, consumer electronics, and aerospace and defense applications, partially offset by lower demand in wireless infrastructure applications and satellite TV dish applications. EMS net sales increased 53.9% primarily due to the acquisitions of DeWAL and DSP, and from higher end-market product demand from core markets, including automotive, mass transit, portable electronics, general industrial and consumer products applications. PES had increased net sales of 21.4% due to higher end-market demand in laser diode cooler applications, renewable energy, mass transit, electric and hybrid electric vehicles and variable frequency motor drives. Net sales were unfavorably impacted by 0.1% due to currency fluctuations primarily as a result of the depreciation in value of the Renminbi relative to the U.S. dollar, offset in part by appreciation in value of the Euro relative to the U.S. dollar.

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Gross Margin
(Dollars in thousands)	2017			2016			Percent Change
Gross Margin	$	318,575		$	249,485		27.7%
Percentage of sales	38.8		%	38.0		%

Gross margin as a percentage of net sales increased by 79 basis points to 38.8% in 2017 compared to 38.0% in 2016. In 2017, gross margin was favorably impacted by an increase in net sales combined with operational excellence initiatives across our operating segments, including increased capacity utilization, operational process enhancements and automation, conversion of fixed cost structure to variable, benefits from low cost country manufacturing expansion, and synergies from the acquisitions of DeWAL and DSP.

Selling, General and Administrative Expenses
(Dollars in thousands)	2017			2016			Percent Change
Selling, general and administrative expenses	$	161,651		$	139,272		16.1%
Percentage of net sales	19.7		%	21.2		%

SG&A expenses increased by 16.1% in 2017 compared to 2016, due principally to $6.1 million of additional equity and incentive compensation expense, $4.8 million of additional other intangible assets amortization and depreciation related to the acquisitions, $4.7 million of additional SG&A expenses from the operations of the acquired businesses, $3.6 million of additional sales and marketing costs, $1.3 million of corporate development activity costs, and $3.4 million for additional asbestos liability accruals. Our 2017 results also included $3.2 million of acquisition and integration costs related to DeWAL and DSP. SG&A decreased as a percent of net sales to 19.7% in 2017 compared to 21.2% in 2016 as a result of administrative cost containment activities.

Research and Development Expenses
(Dollars in thousands)	2017			2016			Percent Change
Research and development expenses	$	29,547		$	28,582		3.4%
Percentage of net sales	3.6		%	4.4		%

R&D expenses increased by 3.4% in 2017 compared to 2016. The increase was due to continued investments that are targeted at developing new platforms and technologies focused on long-term growth initiatives at our Innovation Centers in the United States, Europe and Asia. As a percentage of sales, R&D costs decreased from 4.4% in 2016 to 3.6% in 2017 primarily due to sales growth increasing at a higher rate than the increase in R&D spend.

Restructuring and Impairment Charges and Other Operating (Income) Expense, Net
(Dollars in thousands)	2017			2016		Percent Change
Restructuring and impairment charges	$	3,567		$	734	386.0%
Other operating (income) expense, net	$	(5,329	)	$	—	N/A

In the second quarter of 2017, we completed the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona. We recorded $2.8 million of expense related to this project in 2017 compared to $0.7 million recorded in 2016.

In the third quarter of 2017, we recognized a $0.3 million impairment charge related to our remaining investment in BrightVolt, Inc. As this investment did not relate to a specific operating segment, we allocated it ratably among the three operating segments.

In the fourth quarter of 2017, we recognized a $0.5 million impairment charge related to the remaining net book value of an other intangible asset within our ROLINX^® product line in our PES operating segment.

In the first quarter of 2017, we completed the planned sale of a parcel of land in Belgium that had been classified as held for sale as of December 31, 2016 and recognized a gain on sale of approximately $0.9 million in operating income.

Also in the third quarter of 2017, we completed the sale of a facility located in Belgium and recognized a gain on sale of approximately $4.4 million in operating income.

Equity Income in Unconsolidated Joint Ventures
(Dollars in thousands)	2017		2016		Percent Change
Equity income in unconsolidated joint ventures	$	4,898	$	4,146	18.1%

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Equity income in unconsolidated joint ventures increased 18.1% in 2017 from 2016. The increase was due to higher demand, primarily in the portable electronics market.

Other Income (Expense), Net
(Dollars in thousands)	2017		2016		Percent Change
Other income (expense), net	$	5,019	$	1,167	(330.1)%

In 2017, the increase in other income (expense), net was attributable to gains in copper derivative transactions of approximately $1.9 million compared to gains of $0.5 million in 2016, as well as gains from foreign currency fluctuations of $0.8 million compared to losses of $1.8 million in 2016. In 2016, we also recorded an additional loss related to the sale of the Arlon polyimide and thermoset laminate business of $0.2 million, and $0.8 million of expense for tax indemnity receivables that were reversed due to the release of uncertain tax positions.

Interest Expense, Net
(Dollars in thousands)	2017			2016			Percent Change
Interest expense, net	$	(6,131	)	$	(3,930	)	56.0%

Interest expense, net, increased by 56.0% in 2017 from 2016. This increase was primarily due to higher outstanding borrowings on our credit facility in 2017 compared to 2016 due to borrowings to fund the acquisitions of DeWAL and DSP. As explained in “Liquidity, Capital Resources and Financial Position” below, we made discretionary principal payments of $110.2 million in 2017 to reduce our outstanding borrowings under our credit facility to $131.0 million as of December 31, 2017.

Income Tax Expense
(Dollars in thousands)	2017			2016			Percent Change
Income tax expense	$	52,466		$	33,997		54.3%
Effective tax rate	39.5		%	41.3		%

Our effective tax rate for 2017 was 39.5%, including our provisional estimate of the impact of the U.S. Tax Reform, compared to 41.3% in 2016. The 2017 rate decrease was primarily due to lower foreign tax impact on remitted and unremitted foreign earnings and profits, equity compensation excess tax deductions recognized in 2017 and increased international tax rate benefits due to earnings mix. This was substantially offset by our provisional estimate of the impact of U.S. Tax Reform, a decrease in reversal of reserves associated with uncertain tax positions and a change in valuation allowance associated with deferred tax assets that are capital in nature. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes” to “Item 8. Financial Statements and Supplementary Data.”

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. In accordance with SAB 118, we determined that the $1.7 million of the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and liabilities and the $12.0 million of tax expense recorded in connection with the transition tax on the mandatory deemed repatriation of foreign earnings was a provisional amount and a reasonable estimate at December 31, 2017. Under SAB 118, we completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and developments credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes” to “Item 8. Financial Statements and Supplementary Data.”

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Operating Segment Net Sales and Operating Income

Advanced Connectivity Solutions

(Dollars in thousands)	2018		2017		2016
Net sales	$	294,154	$	301,092	$	277,787
Operating income	$	33,827	$	55,410	$	42,455

2018 vs. 2017

ACS net sales decreased by 2.3% in 2018 compared to 2017. The decrease in net sales was primarily driven by lower demand in wireless 4G LTE and portable electronics applications, partially offset by favorable currency fluctuations of $2.8 million, or 0.9%, due to the appreciation in value of the Euro and Renminbi relative to the U.S. dollar, as well as higher demand in automotive radar and aerospace and defense applications. The adoption of new accounting guidance for revenue recognition did not impact ACS net sales in 2018.

Operating income decreased by 39.0% in 2018 compared to 2017. The decrease in operating income was due to lower net sales, increased costs for copper commodities and multi-site product qualification, including freight, lower capacity utilization due to process issues and machine downtime, as well as strategic investments in capacity optimization, infrastructure and sales and marketing to support future growth initiatives. Additionally, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition. The adoption of new accounting guidance for revenue recognition did not impact ACS operating income in 2018. As a percentage of net sales, the 2018 operating income was 11.5%, an approximately 690 basis point decrease as compared to the 18.4% reported in 2017.

2017 vs. 2016

Net sales in this segment increased by 8.4% in 2017 compared to 2016. The increase in net sales was primarily driven by end market demand in automotive radar, consumer electronics and aerospace and defense applications, partially offset by lower demand in wireless infrastructure and satellite TV dish applications. Net sales were unfavorably impacted by 0.4% due to currency fluctuations, primarily as a result of the depreciation in value of the Renminbi relative to the U.S. dollar.

Operating income improved by 30.5% in 2017 compared to 2016. As a percentage of net sales in 2017, operating income was 18.4%, a 310 basis point increase, compared to 15.3% in 2016. This increase was primarily due to higher net sales as well as lower costs from continued operational efficiencies and cost reduction initiatives.

Elastomeric Material Solutions

(Dollars in thousands)	2018		2017		2016
Net sales	$	341,364	$	312,661	$	203,181
Operating income	$	52,502	$	50,908	$	25,884

2018 vs. 2017

EMS net sales increased by 9.2% in 2018 compared to 2017. The increase in net sales was primarily driven by net sales related to our acquisition of Griswold of $13.7 million, or 4.4%, higher demand in portable electronics and automotive applications, as well as favorable currency fluctuations of $3.5 million, or 1.1%, due to the appreciation in value of the Euro and Renminbi relative to the U.S. dollar. The adoption of new accounting guidance for revenue recognition favorably impacted EMS net sales in 2018 by $0.7 million, or 0.2%.

Operating income increased by 3.1% in 2018 compared to 2017. The increase in operating income was primarily due to increased net sales related to our acquisition of Griswold and organic growth, a gain from the settlement of antitrust litigation of $4.2 million, discussed in “Note 18 – Supplemental Financial Information” to “Item 8. Financial Statements and Supplementary Data,” a gain of $0.7 million for the settlement of indemnity claims related to the DSP acquisition, as well as discretionary cost control. These increases in operating income were partially offset by increased costs for raw materials and facility consolidation, unfavorable absorption of fixed costs, strategic investments in sales and marketing to support future growth initiatives, as well as increases in other intangible assets amortization. The adoption of new accounting guidance for revenue recognition favorably impacted EMS operating income in 2018 by $0.2 million, or 0.4%. As a percentage of net sales, the 2018 operating income was 15.4%, an approximately 90 basis point decrease as compared to the 16.3% reported in 2017.

2017 vs. 2016

Net sales in this segment increased 53.9% in 2017 compared to 2016. The increase in net sales was primarily driven by the acquisitions of DeWAL and DSP, 38.8%, as well as an increase in organic net sales 15.1%. EMS experienced higher end-market demand in core markets including automotive, mass transit, portable electronics, general industrial and consumer products

26

applications. Net sales were unfavorably impacted by 0.4% due to currency fluctuations, primarily as a result of the depreciation in value of the Renminbi relative to the U.S. dollar, partially offset by the appreciation in value of the Korean Won and Euro relative to the U.S. dollar.

Operating income improved 96.7% in 2017 as compared to 2016. As a percentage of net sales, 2017 operating income was 16.3%, a 360 basis point increase compared to 12.7% in 2016. This increase was primarily due to higher net sales attributable to both acquisitions and organic growth, as well as lower costs from continued operational efficiencies. Operating income in 2017 included a $1.6 million charge to reflect a purchase accounting fair value adjustment for inventory related to the DeWAL and DSP acquisitions and $3.2 million of acquisition and integration costs. Operating income in 2017 also included increased other intangible assets amortization and depreciation expense of $4.9 million related to the DeWAL and DSP acquisitions.

Power Electronics Solutions

(Dollars in thousands)	2018		2017		2016
Net sales	$	223,338	$	184,954	$	152,367
Operating income	$	19,648	$	15,668	$	5,229

2018 vs. 2017

PES net sales increased by 20.8% in 2018 compared to 2017. Net sales increased in electric and hybrid electric vehicles and micro-channel coolers applications, primarily due to higher demand. Net sales were also impacted by favorable currency fluctuations of $8.9 million, or 4.8%, due to the appreciation in value of the Euro and Renminbi relative to the U.S. dollar. The adoption of new accounting guidance for revenue recognition favorably impacted PES net sales in 2018 by $6.3 million, or 3.4%.

Operating income increased25.4% in 2018 compared to 2017. The adoption of new accounting guidance for revenue recognition favorably impacted PES operating income in 2018 by $2.0 million, or 12.8%. The increase in operating income was also due to increases in net sales from higher demand, partially offset by strategic investments in capacity optimization and sales and marketing to support future growth initiatives, a commercial settlement, increased costs for facility consolidation and new product launch, as well as process issues. As a percentage of net sales, the 2018 operating income was 8.8%, an approximately 30 basis point increase as compared to the 8.5% reported in 2017.

2017 vs. 2016

Net sales in this segment increased 21.4% in 2017 compared to 2016. The increase in net sales was driven by higher demand for laser diode coolers, renewable energy, mass transit, electric and hybrid electric vehicles and variable frequency motor drives applications. Net sales were favorably impacted by 0.8% due to currency fluctuations primarily as a result of the appreciation in value of the Euro relative to the U.S. dollar, partially offset by the depreciation in value of the Renminbi relative to the U.S. dollar.

Operating income increased 199.6% in 2017 compared to 2016. As a percentage of net sales, 2017 operating income was 8.5%, a 510 basis point increase as compared to 3.4% in 2016. This increase was primarily due to higher net sales and increased equipment utilization, supply chain volume discounts, and improved productivity from operational excellence initiatives, partially offset by a $0.5 million impairment charge related to the remaining net book value of an other intangible asset within our ROLINX^® product line in our PES operating segment.

Other

(Dollars in thousands)	2018		2017		2016
Net sales	$	20,235	$	22,336	$	22,979
Operating income	$	6,734	$	7,153	$	7,329

2018 vs 2017

Net sales in this segment decreased by 9.4% in 2018 compared to 2017. The decrease in net sales was primarily driven by the adoption of new accounting guidance for revenue recognition, which resulted in a $2.4 million unfavorable impact, or 10.5%. Currency fluctuations had a $0.3 million favorable impact on net sales during 2018 due to the appreciation in value of the Euro and Renminbi relative to the U.S. dollar.

Operating income decreased by 5.9% in 2018 compared to 2017. This decrease in operating income was primarily driven by lower net sales, partially offset by operational improvements and efficiency initiatives. Operating income in 2018 was unfavorably impacted by $0.7 million, or 10.5%, from the adoption of new accounting guidance for revenue recognition. As a percentage of net sales, the 2018 operating income was 33.3%, an approximately 130 basis point increase as compared to the 32.0% reported in the 2017.

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2017 vs. 2016

Net sales decreased 2.8% in 2017 compared to 2016, primarily due to lower demand in global light vehicles, as well as a negative impact from currency fluctuations of 0.7% resulting from a depreciation in the value of the Renminbi relative to the U.S. dollar.

Operating income in 2017 decreased by 2.4% compared to 2016 primarily due to lower net sales, partially offset by the impact of continuing operating efficiencies.

Product and Market Development

Our research and development team is dedicated to growing our business by developing cost effective solutions that improve the performance of customers’ products and by identifying business and technology acquisition or development opportunities to expand our market presence.

Liquidity, Capital Resources and Financial Position

We believe that our existing sources of liquidity and cash flows that are expected to be generated from our operations, together with our available credit facilities, will be sufficient to fund our operations, currently planned capital expenditures, research and development efforts and our debt service commitments, for at least the next 12 months. We regularly review and evaluate the adequacy of our cash flows, borrowing facilities and banking relationships seeking to ensure that we have the appropriate access to cash to fund both our near-term operating needs and our long-term strategic initiatives.

(Dollars in thousands)	As of December 31,
Key Financial Position Accounts:	2018		2017
Cash and cash equivalents	$	167,738	$	181,159
Accounts receivable, less allowance for doubtful accounts	144,623		140,562
Contract assets	22,728		—
Inventories	132,637		112,557
Borrowings under revolving credit facility	228,482		130,982

The following table illustrates the location of our cash and cash equivalents by our three major geographic areas:

	As of December 31,
(Dollars in thousands)	2018		2017		2016
United States	$	41,833	$	35,653	$	95,481
Europe	31,244		41,307		37,791
Asia	94,661		104,199		94,495
Total cash and cash equivalents	$	167,738	$	181,159	$	227,767

Approximately $125.9 million of cash and cash equivalents were held by non-U.S. subsidiaries as of December 31, 2018. The Company did not make any changes in 2018 to its position on the permanent reinvestment of its earnings from foreign operations. With the exception of certain of our Chinese subsidiaries, we continue to assert that historical foreign earnings are indefinitely reinvested.

Net working capital was $378.6 million, $340.7 million and $357.2 million as of December 31, 2018, 2017 and 2016, respectively.

Significant changes in our statement of financial position accounts from December 31, 2017 to December 31, 2018 were as follows:

• Accounts receivable, less allowance for doubtful accounts increased2.9% to $144.6 millionas of December 31, 2018, from $140.6 million as of December 31, 2017. The increase was primarily due to higher net sales at the end of 2018 compared to at the end of the 2017.

• We recorded contract assets of $22.7 millionas of December 31, 2018 related to the adoption of ASU 2014-09. For additional information, refer to “Note 16 – Revenue from Contracts with Customers” to “Item 8. Financial Statements and Supplementary Data.”

• Inventoriesincreased17.8% to $132.6 millionas of December 31, 2018, from $112.6 million as of December 31, 2017, as a result of our acquisition of Griswold, additional purchases as a result of changes in vendor allocations, supplier transition, safety stock replenishment and raw material cost increases, partially offset by the impact from the adoption of new accounting guidance for revenue recognition. For additional information regarding the impact of the new revenue recognition adoption, refer to “Note 16 – Revenue from Contracts with Customers” to “Item 8. Financial Statements and Supplementary Data.”

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• Accrued employee benefits and compensation decreased to $30.5 millionas of December 31, 2018, from $39.4 million as of December 31, 2017. This decrease is primarily due to incentive compensation payouts of $18.2 million that occurred during 2018, partially offset by $5.8 million of accruals for projected incentive compensation payouts for the 2018 performance year.

• Goodwillincreased11.7% to $264.9 millionas of December 31, 2018, from $237.1 million as of December 31, 2017, primarily due to the acquisition of Griswold in July 2018.

• Other intangible assets, net of amortization, increased10.4% to $177.0 millionas of December 31, 2018, from $160.3 million as of December 31, 2017, primarily due to the acquisition of Griswold in July 2018.

(Dollars in thousands)	For the year ended December 31,
Key Cash Flow Measures:	2018			2017			2016
Net cash provided by operating activities	$	66,820		$	138,982		$	116,967
Net cash used in investing activities	(167,437		)	(78,270		)	(151,804		)
Net cash provided by (used in) financing activities	88,682			(113,187		)	57,869

As of December 31, 2018, cash and cash equivalents were $167.7 million as compared to $181.2 million as of December 31, 2017, a decrease of $13.4 million, or 7.4%. This decrease was primarily due to $78.0 million paid for the Griswold acquisition, net of cash acquired, $47.1 million in capital expenditures, $43.4 million paid for the Isola asset acquisition, and $25.4 million in pension and other postretirement benefits contributions, along with $6.6 million in tax payments related to net share settlement of equity awards, $5.0 million of principal payments made on our outstanding borrowings on our revolving credit facility and $3.0 million in repurchases of capital stock. This activity was partially offset by proceeds of $102.5 million from additional borrowings under our revolving credit facility, of which $82.5 million and $20.0 million were used to fund the Griswold acquisition and the voluntary pension plan contribution, respectively, and by cash flows generated by operations.

In 2017, cash and cash equivalents decreased$46.6 million, primarily due to $110.2 million of principal payments made on our outstanding borrowings on our revolving credit facility, $60.2 million cash paid for the DSP acquisition, net of cash acquired and $27.2 million in capital expenditures, partially offset by cash flows generated by operations.

In 2016, cash and cash equivalents increased $23.2 million, primarily due to proceeds of $166.0 million from borrowings under our revolving credit facility and cash flows generated by operations, partially offset by $133.9 million of cash paid for the DeWAL acquisition, net of cash acquired, $100.0 million of principal payments made on our outstanding borrowings under our revolving credit facility and $18.1 million in capital expenditures.

Revolving Credit Facility

On February 17, 2017, we entered into a secured five year credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto (the Third Amended Credit Agreement), which amended and restated the Second Amended Credit Agreement. The Third Amended Credit Agreement refinanced the Second Amended Credit Agreement, eliminated the term loan under the Second Amended Credit Agreement, increased the principal amount of our revolving credit facility to up to $450.0 million of borrowing capacity, with sublimits for multicurrency borrowings, letters of credit and swing-line notes, and provided an additional $175.0 million accordion feature.

All revolving loans under the Third Amended Credit Agreement are due on the maturity date, February 17, 2022. We are not required to make any quarterly principal payments under the Third Amended Credit Agreement. During 2018, 2017 and 2016, we made discretionary principal payments of $5.0 million, $110.2 million and $100.0 million, respectively on the outstanding borrowings under our revolving credit facility. As of December 31, 2018, we had $228.5 million in outstanding borrowings under our revolving credit facility. For additional information regarding the Third Amended Credit Agreement, refer to “Note 11 – Debt and Capital Leases” to “Item 8. Financial Statements and Supplementary Data.”

Restriction on Payment of Dividends

Our Third Amended Credit Agreement generally permits us to pay cash dividends to our shareholders, provided that (i) no default or event of default has occurred and is continuing or would result from the dividend payment and (ii) our leverage ratio does not exceed 2.75 to 1.00. If our leverage ratio exceeds 2.75 to 1.00, we may nonetheless make up to $20.0 million in restricted payments, including cash dividends, during the fiscal year, provided that no default or event of default has occurred and is continuing or would result from the payments. Our leverage ratio did not exceed 2.75 to 1.00as of December 31, 2018.

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Contractual Obligations

The following table summarizes our significant contractual obligations as of December 31, 2018.

	Payments Due by Period
(Dollars in thousands)	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
Operating leases	$	11,217	$	3,951	$	5,268	$	1,998	$	—
Capital leases	5,344		543		4,801		—		—
Interest payments on capital lease	295		125		170		—		—
Inventory purchase obligations	344		344		—		—		—
Capital commitments(1)	17,606		17,606		—		—		—
Borrowings under revolving credit facility(2)	228,482		—		—		228,482		—
Interest payments on outstanding borrowings(3)	28,000		8,955		17,851		1,194		—
Retiree health and life insurance benefits	1,880		334		436		285		825
Total	$	293,168	$	31,858	$	28,526	$	231,959	$	825

⁽¹⁾  This amount represents non-cancelable vendor purchase commitments.

⁽²⁾  All outstanding borrowings under our revolving credit facility are due on February 17, 2022.

⁽³⁾  Estimated future interest payments are based on a leverage ratio based spread that ranges from 1.375% to 1.75%, plus projected forward 1-month LIBOR rates, and have been adjusted for the impact of the floating to fixed rate interest rate swap on $75.0 million of the outstanding borrowings under our revolving credit facility. For additional information, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments” to “Item 8. Financial Statements and Supplementary Data.”

Unfunded pension benefit obligations, which amount to $0.2 million as of December 31, 2018, are expected to be paid from operating cash flows and the timing of payments is not definitive. Retiree health and life insurance benefits, which amount to $1.9 million, are expected to be paid from operating cash flows.

Other long-term liabilities, such as deferred taxes, unrecognized tax benefits and asbestos-related product liability reserves, have been excluded from the table due to the uncertainty of the timing of payments combined with the absence of historical trends to be used as a predictor for such payments.

Effects of Inflation

We do not believe that inflation had a material impact on our business, net sales, or operating results during the periods presented.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements that have, or are, in the opinion of management, reasonably likely to have, a current or future material effect on our results of operations or financial position.

Critical Accounting Estimates

Our consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles, which require management to make estimates, judgments and assumptions that affect the amounts reported in the financial statements and accompanying notes. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances and believe that appropriate reserves have been established based on reasonable methodologies and appropriate assumptions based on facts and circumstances that are known; however, actual results may differ from these estimates under different assumptions or conditions. An accounting policy is deemed to be critical if it requires an accounting estimate to be made based on assumptions that are highly judgmental and uncertain at the time the estimate is made, if different estimates could reasonably have been used, or if changes to those estimates are reasonably likely to periodically occur that could affect the amounts carried in the financial statements. A summary of our critical accounting estimates is presented below:

Inventory Valuation

Inventories are stated at the lower of cost or net realizable value with costs determined primarily on a first-in first-out basis. We also maintain a reserve for excess, obsolete and slow-moving inventory that is primarily developed by utilizing both specific product identification and historical product demand as the basis for our analysis. Products and materials that are specifically identified as obsolete are fully reserved. In general, most products that have been held in inventory greater than one year are fully reserved unless there are mitigating circumstances, including forecasted sales or current orders for the product. The remainder of the allowance is based on our estimates and fluctuates with market conditions, design cycles and other economic factors. Risks associated with this allowance include unforeseen changes in business cycles that could affect the marketability of certain products and an unexpected decline in current production. We closely monitor the marketplace and related inventory levels and have historically maintained reasonably accurate allowance levels. Our obsolescence reserve has ranged from 9% to 14% of gross inventory over the last three years.

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Goodwill and Other Intangible Assets

We have made acquisitions over the years that included the recognition of intangible assets. Intangible assets are classified into three categories: (1) goodwill; (2) other intangible assets with definite lives subject to amortization; and (3) other intangible assets with indefinite lives not subject to amortization. Other intangible assets can include items such as trademarks and trade names, licensed technology, customer relationships and covenants not to compete, among other things. Each definite-lived other intangible asset is amortized over its respective economic useful life using the economic attribution method.

Goodwill is tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that our goodwill is impaired, then we compare the estimated fair value of each of our reporting units to their respective carrying value. If a reporting unit’s carrying value is greater than its fair value, then an impairment is recognized for the excess and charged to operations. We currently have four reporting units with goodwill: ACS, EMS, curamik^® and Elastomer Components Division (ECD). Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018.

The application of the annual goodwill impairment test requires significant judgment, including the identification of reporting units, assignment of assets and liabilities to reporting units and determination of the fair value of each reporting unit. Determining the fair value is subjective and requires the use of significant estimates and assumptions, including financial projections for net sales, gross margin and operating margin, discount rates, terminal year growth rates and future market conditions, among others. We estimated the fair value of our reporting units using an income approach based on the present value of future cash flows through a five year discounted cash flow analysis. The discounted cash flow analysis utilized the discount rates for each of the reporting units ranging from 11.3% for EMS to 12.9% for ECD, and terminal year growth rates ranging from 4.9% for curamik^® to 5.9% for ACS. We believe this approach yields the most appropriate evidence of fair value as our reporting units are not easily compared to other corporations involved in similar businesses. We further believe that the assumptions and rates used in our annual goodwill impairment test are reasonable, but inherently uncertain. There were no impairment charges resulting from our goodwill impairment analysis for the year ended December 31, 2018. Our ACS, EMS, curamik^® and ECD reporting units had allocated goodwill of approximately $51.7 million, $142.6 million, $68.4 million and $2.2 million respectively, as of December 31, 2018.

Indefinite-lived other intangible assets are tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that an indefinite-lived other intangible asset is impaired, then we compare the estimated fair value of that indefinite-lived other intangible asset to its respective carrying value. If an indefinite-lived other intangible asset’s carrying value is greater than its fair value, then an impairment charge is recognized for the excess and charged to operations. The application of the annual indefinite-lived other intangible asset impairment test requires significant judgment, including the determination of fair value of each indefinite-lived other intangible asset. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our indefinite-lived other intangible assets impairment analysis for the year ended December 31, 2018. Our curamik^® reporting unit had an indefinite-lived other intangible asset of approximately $4.5 million as of December 31, 2018.

Definite-lived other intangible assets are tested for recoverability whenever events or changes in circumstances indicate the carrying value may not be recoverable. The recoverability test involves comparing the estimated sum of the undiscounted cash flows for each definite-lived other intangible asset to its respective carrying value. If a definite-lived other intangible asset’s carrying value is greater than the sum of its undiscounted cash flows, then the definite-lived other intangible asset’s carrying value is compared to its estimated fair value and an impairment charge is recognized for the excess and charged to operations. The application of the recoverability test requires significant judgment, including the identification of the asset group and determination of undiscounted cash flows and fair value of the underlying definite-lived other intangible asset. Determination of undiscounted cash flows requires the use of significant estimates and assumptions, including certain financial projections. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our definite-lived other intangible assets impairment analysis for the year ended December 31, 2018. Our ACS, EMS and curamik^® reporting units had definite-lived other intangible assets of approximately $7.9 million, $152.2 million and $12.4 million, respectively, as of December 31, 2018.

Product Liabilities

We endeavor to maintain insurance coverage with reasonable deductible levels to protect us from potential exposures to product liability claims. Any liability associated with such claims is based on management’s best estimate of the potential claim value, while insurance receivables associated with related claims are not recorded until verified by the insurance carrier.

For asbestos-related claims, we recognize projected asbestos liabilities and related insurance receivables, with any difference between the liability and related insurance receivable recognized as an expense in the consolidated statements of operations. Our estimates of asbestos-related contingent liabilities and related insurance receivables are based on an independent actuarial analysis and an independent insurance usage analysis prepared annually by third parties. The actuarial analysis contains numerous

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assumptions, including number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, average settlement costs, average defense costs, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these assumptions are subject to even greater uncertainty as the projection period lengthens. The insurance usage analysis considers, among other things, applicable deductibles, retentions and policy limits, the solvency and historical payment experience of various insurance carriers, the likelihood of recovery as estimated by external legal counsel and existing insurance settlements.

The liability projection period covers all current and future claims through 2058, which represents the expected end of our asbestos liability exposure with no further ongoing claims expected beyond that date. This conclusion was based on our history and experience with the claims data, the diminished volatility and consistency of observable claims data, the period of time that has elapsed since we stopped manufacturing products that contained encapsulated asbestos and an expected downward trend in claims due to the average age of our claimants, which is approaching the average life expectancy.

There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we may incur additional charges for our asbestos liabilities and defense costs in the future, that could exceed existing reserves and insurance recovery. We plan to continue to vigorously defend ourselves and believe we have substantial unutilized insurance coverage to mitigate future costs related to this matter.

We review our asbestos-related projections annually in the fourth quarter of each year unless facts and circumstances materially change during the year, at which time we would analyze these projections. We believe the assumptions made on the potential exposure and expected insurance coverage are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation.

As of December 31, 2018, the estimated liability and estimated insurance recovery for all current and future claims projected through 2058 was $70.3 million and $63.8 million, respectively.

Revenue Recognition

Recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. We recognize revenue when all of the following criteria are met: (1) we have entered into a binding agreement, (2) the performance obligations have been identified, (3) the transaction price to the customer has been determined, (4) the transaction price has been allocated to the performance obligations in the contract, and (5) the performance obligations have been satisfied. The majority of our shipping terms permit us to recognize revenue at point of shipment. Some shipping terms require the goods to be through customs or be received by the customer before title passes. In those instances, revenue is not recognized until either the customer has received the goods or they have passed through customs, depending on the circumstances. Shipping and handling costs are treated as fulfillment costs. Sales tax or value added tax (VAT) are excluded from the measurement of the transaction price.

The Company manufactures some products to customer specifications which are customized to such a degree that it is unlikely that another entity would purchase these products or that we could modify these products for another customer. These products are deemed to have no alternative use to the Company whereby we have an enforceable right to payment evidenced by contractual termination clauses. In accordance with ASC 606, for those circumstances we recognize revenue on an over-time basis. Revenue recognition does not occur until the product meets the definition of “no alternative use” and therefore, items that have not yet reached that point in the production process are not included in the population of items with over-time revenue recognition.

As appropriate, we record estimated reductions to revenue for customer returns, allowances, and warranty claims. Provisions for such reductions are made at the time of sale and are typically derived from historical trends and other relevant information.

Pension and Other Postretirement Benefits

We provide various defined benefit pension plans for our U.S. employees and sponsor three defined benefit health care plans and a life insurance plan. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rates of return on plan assets, mortality rates, and other factors. The assumptions used were determined as follows: (i) the discount rate used is based on the PruCurve high quality corporate bond index, with comparisons against other similar indices; and (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market conditions and our expectations of future returns. We determine these assumptions based on consultation with outside actuaries and investment advisors. Any changes in these assumptions could have a significant impact on future recognized pension costs, assets and liabilities.

The rates used to determine our costs and obligations under our pension and postretirement plans are disclosed in “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans” to “Item 8. Financial Statements and Supplementary Data.” Each assumption has different sensitivity characteristics. For the year ended December 31, 2018, a 25 basis

32

point decrease in the discount rate would have increased our pension expense for Rogers Corporation Employees’ Pension Plan (the Union Plan), the Rogers Corporation Defined Benefit Pension Plan (following its merger with the Hourly Employees Pension Plan of Arlon LLC, Microwave Material and Silicone Technologies Divisions, Bear, Delaware (the Merged Plan)), and the Rogers Corporation Amended and Restated Pension Restoration Plan and the Rogers Corporation Amended and Restated Pension Restoration Plan (the Nonqualified Plans) by a de minimis amount. A 25 basis point decrease in the discount rate would have decreased the other post-employment benefits (OPEB) expense by a de minimis amount. A 25 basis point decrease in the expected return on assets would have increased the total 2018 pension expense for the Union Plan and the Merged Plan by approximately $0.4 million. Since the OPEB and Nonqualified Plans are unfunded, those plans would not be impacted by this assumption change.

Equity Compensation

Determining the amount of equity compensation expense to be recorded requires us to develop estimates to be used in calculating the grant-date fair value of performance-based restricted stock units.

Performance-Based Restricted Stock Units

As of December 31, 2018, we had performance-based restricted stock units from 2018, 2017 and 2016 outstanding. These awards generally cliff vest at the end of a three year measurement period. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed during the measurement period. Participants are eligible to be awarded shares ranging from 0% to 200% of the original award amount, based on certain defined performance measures.

The 2018, 2017 and 2016 awards have one measurement criteria: the three year total shareholder return (TSR) on the performance of our capital stock as compared to that of a specified group of peer companies. The TSR measurement criteria of the awards is considered a market condition. As such, the fair value of this measurement criteria was determined on the grant date using a Monte Carlo simulation valuation model. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards. We account for forfeitures as they occur.

Below were the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2018 and 2017:

	September 17, 2018	February 8, 2018	February 9, 2017
Expected volatility	36.6%	34.8%	33.6%
Expected term (in years)	3.0	3.0	3.0
Risk-free interest rate	2.85%	2.28%	1.38%

Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility.

Expected term – We use the measurement period of the award to determine the expected term assumption for the Monte Carlo simulation valuation model.

Risk-free interest rate – We use an implied “spot rate” yield on U.S. Treasury Constant Maturity rates as of the grant date for our assumption of the risk-free interest rate.

Expected dividend yield – We do not currently pay dividends on our capital stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model.

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Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Market Risk

• Foreign Currency Risk

Our financial results are affected by changes in foreign exchange rates and economic conditions in foreign countries in which we operate. Our primary overseas markets are in Europe and Asia, thus exposing us to exchange rate risk from fluctuations in the Euro and the various currencies used in Asia. Exposure to variability in currency exchange rates is mitigated, when possible, through the use of natural hedges, whereby purchases and sales in the same foreign currency and with similar maturity dates offset one another. We further mitigate this exposure through hedging activities by entering into foreign exchange forward contracts with third parties when the use of natural hedges is not possible or desirable. We currently do not use derivative instruments for trading or speculative purposes. We monitor foreign exchange risks and at times manage such risks on specific transactions. Our risk management process primarily uses analytical techniques and sensitivity analysis. In 2018, a 10% strengthening of the U.S dollar relative to other currencies would have resulted in a decrease to net sales and net income of approximately $37 million and $5 million, respectively, while a 10% weakening of the U.S. dollar relative to other currencies would have resulted in an increase to net sales and net income of approximately $45 million and $6 million, respectively.

• Interest Rate Risk

As of December 31, 2018, we had $228.5 million in borrowings outstanding under our revolving credit facility. The interest charged on these borrowings fluctuates with movements in the benchmark LIBOR. As of December 31, 2018, the effective all-in rate of interest on our revolving credit facility was 3.77%, net of the impact of our interest rate swap, and a 100 basis point increase in LIBOR would have increased the amount of interest expense by approximately $1.8 million for the year ended December 31, 2018.

• Commodity Risk

We are subject to fluctuations in the cost of raw materials used to manufacture our materials and products. In particular, we are exposed to market fluctuations in commodity pricing as we utilize certain materials, such as copper and ceramic, that are key materials in certain of our products. In order to minimize the risk of market driven price changes in these commodities, we utilize hedging strategies to insulate us against price fluctuations of copper, the most frequently used commodity in our manufacturing processes. We currently do not use hedging strategies to minimize the risk of price fluctuations on other commodity-based raw materials; however, we regularly review such strategies to hedge market risk on an ongoing basis.

For additional discussion, refer to “Note 2 – Fair Value Measurements” and “Note 3 – Hedging Transactions and Derivative Financial Instruments” to “Item 8. Financial Statements and Supplementary Data.”

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Item 8. Financial Statements and Supplementary Data

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of Rogers Corporation

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial position of Rogers Corporationand its subsidiaries (the “Company”) as of December 31, 2018 and 2017,and the related consolidated statements of operations, comprehensive income, shareholders’ equity and cash flows for each of the three years in the period ended December 31, 2018, including the related notes and financial statement schedule listed in the index appearing under Item 15(2) (collectively referred to as the “consolidated financial statements”).We also have audited the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework(2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidatedfinancial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of itsoperations and itscash flows for each of the three years in the period ended December 31, 2018in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework(2013)issued by the COSO.

Change in Accounting Principle

As discussed in Note 16 to the consolidated financial statements, the Company changed the manner in which it accounts for revenues from contracts with customers in 2018.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidatedfinancial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidatedfinancial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidatedfinancial statements included performing procedures to assess the risks of material misstatement of the consolidatedfinancial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidatedfinancial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidatedfinancial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

As described in Management’s Report on Internal Control over Financial Reporting, management has excluded Griswold LLC (Griswold) from its assessment of internal control over financial reporting as of December 31, 2018, because it was acquired by the Company in a purchase business combination during 2018. We have also excluded Griswold from our audit of internal control over financial reporting. Griswold is a wholly-owned subsidiary whose total assets and total revenues excluded from management’s assessment and our audit of internal control over financial reporting represent 1.3% and 1.6%, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2018.

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Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Hartford, Connecticut

February 20, 2019

We have served as the Company’s auditor since 2015.

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ROGERS CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

For each of the fiscal years in the three-year period ended December 31, 2018

(Dollars and shares in thousands, except per share amounts)	2018			2017			2016
Net sales	$	879,091		$	821,043		$	656,314
Cost of sales	568,308			502,468			406,829
Gross margin	310,783			318,575			249,485
Selling, general and administrative expenses	164,046			161,651			139,272
Research and development expenses	33,075			29,547			28,582
Restructuring and impairment charges	4,038			3,567			734
Other operating (income) expense, net	(3,087		)	(5,329		)	—
Operating income	112,711			129,139			80,897
Equity income in unconsolidated joint ventures	5,501			4,898			4,146
Other income (expense), net	(994		)	5,019			1,167
Interest expense, net	(6,629		)	(6,131		)	(3,930		)
Income before income tax expense	110,589			132,925			82,280
Income tax expense	22,938			52,466			33,997
Net income	$	87,651		$	80,459		$	48,283
Basic earnings per share	$	4.77		$	4.43		$	2.68
Diluted earnings per share	$	4.70		$	4.34		$	2.65
Shares used in computing:
Basic earnings per share	18,374			18,154			17,991
Diluted earnings per share	18,659			18,547			18,223

The accompanying notes are an integral part of the consolidated financial statements.

37

ROGERS CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

For each of the fiscal years in the three-year period ended December 31, 2018

(Dollars in thousands)	2018			2017			2016
Net income	$	87,651		$	80,459		$	48,283
Foreign currency translation adjustment	(12,505		)	28,463			(5,081		)
Derivative instrument designated as cash flow hedge:
Change in unrealized gain (loss) before reclassifications, net of tax (Note 4)	519			(6		)	—
Unrealized (gain) loss reclassified into earnings, net of tax (Note 4)	(191		)	32			11
Pension and other postretirement benefits:
Actuarial net gain (loss) incurred, net of tax (Note 4)	(1,678		)	(1,481		)	1,106
Amortization of gain, net of tax (Note 4)	176			99			160
Other comprehensive income (loss)	(13,679		)	27,107			(3,804		)
Comprehensive income	$	73,972		$	107,566		$	44,479

The accompanying notes are an integral part of the consolidated financial statements.

38

ROGERS CORPORATION

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

(Dollars and share amounts in thousands, except par value of capital stock)	As of December 31,
	2018			2017
Assets
Current assets
Cash and cash equivalents	$	167,738		$	181,159
Accounts receivable, less allowance for doubtful accounts of $1,354 and $1,525	144,623			140,562
Contract assets	22,728			—
Inventories	132,637			112,557
Prepaid income taxes	3,093			3,087
Asbestos-related insurance receivables, current portion	4,138			5,682
Assets held for sale	—			896
Other current assets	10,829			10,580
Total current assets	485,786			454,523
Property, plant and equipment, net of accumulated depreciation of $317,414 and $289,909	242,759			179,611
Investments in unconsolidated joint ventures	18,667			18,324
Deferred income taxes	8,236			6,008
Goodwill	264,885			237,107
Other intangible assets, net of amortization	177,008			160,278
Asbestos-related insurance receivables, non-current portion	59,685			63,511
Other long-term assets	22,318			5,772
Total assets	$	1,279,344		$	1,125,134
Liabilities and Shareholders’ Equity
Current liabilities
Accounts payable	$	40,321		$	36,116
Accrued employee benefits and compensation	30,491			39,394
Accrued income taxes payable	7,032			6,408
Capital lease obligations, current portion	420			579
Asbestos-related liabilities, current portion	5,547			5,682
Other accrued liabilities	23,369			25,629
Total current liabilities	107,180			113,808
Borrowings under revolving credit facility	228,482			130,982
Capital lease obligations, non-current portion	4,629			5,873
Pension liability	270			8,720
Retiree health care and life insurance benefits	1,469			1,685
Asbestos-related liabilities, non-current portion	64,799			70,500
Non-current income tax	8,418			12,823
Deferred income taxes	10,806			10,706
Other long-term liabilities	4,967			3,464
Commitments and contingencies (Note 13)
Shareholders’ equity
Capital stock - $1 par value; 50,000 authorized shares; 18,395 and 18,255 shares issued and outstanding	18,395			18,255
Additional paid-in capital	132,360			128,933
Retained earnings	776,403			684,540
Accumulated other comprehensive loss	(78,834		)	(65,155		)
Total shareholders' equity	848,324			766,573
Total liabilities and shareholders' equity	$	1,279,344		$	1,125,134

The accompanying notes are an integral part of the consolidated financial statements.

39

ROGERS CORPORATION

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY

For each of the fiscal years in the three-year period ended December 31, 2018

(Dollars in thousands)	Capital Stock			Additional Paid-In Capital			Retained Earnings		Accumulated Other Comprehensive Loss			Total Shareholders’ Equity
Balance as of December 31, 2015	$	17,957		$	112,017		$	543,066	$	(88,458	)	$	584,582
Net income	—			—			48,283		—			48,283
Other comprehensive income (loss)	—			—			—		(3,804		)	(3,804		)
Shares issued for vested restricted stock units, net of cancellations for tax withholding	63			(1,440		)	—		—			(1,377		)
Stock options exercised	95			4,048			—		—			4,143
Shares issued for employee stock purchase plan	23			835			—		—			858
Shares issued to directors	24			(24		)	—		—			—
Equity compensation expense	—			11,275			—		—			11,275
Tax adjustments on share-based compensation	—			(179		)	—		—			(179		)
Shares repurchased	(141		)	(7,854		)	—		—			(7,995		)
Balance as of December 31, 2016	18,021			118,678			591,349		(92,262		)	635,786
Net income	—			—			80,459		—			80,459
Other comprehensive income (loss)	—			—			—		27,107			27,107
Shares issued for vested restricted stock units, net of cancellations for tax withholding	121			(5,430		)	—		—			(5,309		)
Stock options exercised	83			3,002			—					3,085
Shares issued for employee stock purchase plan	15			880			—					895
Shares issued to directors	15			(15		)	—					—
Equity compensation expense	—			11,818			—					11,818
Cumulative-effect adjustment of change in accounting for share-based compensation	—			—			12,732		—			12,732
Shares repurchased	—			—			—		—			—
Balance as of December 31, 2017	18,255			128,933			684,540		(65,155		)	766,573
Net income	—			—			87,651		—			87,651
Other comprehensive income (loss)	—			—			—		(13,679		)	(13,679		)
Shares issued for vested restricted stock units, net of cancellations for tax withholding	117			(6,717		)	—		—			(6,600		)
Stock options exercised	22			839			—		—			861
Shares issued for employee stock purchase plan	12			1,070			—		—			1,082
Shares issued to directors	12			(12		)	—		—			—
Equity compensation expense	—			11,223			—		—			11,223
Cumulative-effect adjustment of revenue recognition	—			—			4,212		—			4,212
Shares repurchased	(23		)	(2,976		)	—		—			(2,999		)
Balance as of December 31, 2018	$	18,395		$	132,360		$	776,403	$	(78,834	)	$	848,324

The accompanying notes are an integral part of the consolidated financial statements.

40

ROGERS CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

For each of the fiscal years in the three-year period ended December 31, 2018

(Dollars in thousands)	2018			2017			2016
Operating Activities:
Net income	$	87,651		$	80,459		$	48,283
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	50,073			44,099			37,847
Equity compensation expense	11,223			11,818			11,275
Deferred income taxes	(3,325		)	17,513			7,382
Equity in undistributed income of unconsolidated joint ventures	(5,501		)	(4,898		)	(4,146		)
Dividends received from unconsolidated joint ventures	4,431			3,529			2,757
Pension and other postretirement benefits	(1,552		)	(1,561		)	(2,822		)
Asbestos-related charges	704			3,400			313
(Gain) loss on sale or disposal of property, plant and equipment	(164		)	(5,154		)	225
Impairment charges	1,506			807			—
Provision (benefit) for doubtful accounts	236			(439		)	1,321
Proceeds from insurance related to operations	—			932			—
Changes in assets and liabilities:
Accounts receivable	(3,824		)	(14,059		)	(13,005		)
Contract assets	(22,728		)	—			—
Inventories	(19,013		)	(14,208		)	9,689
Pension and postretirement benefit contributions	(25,354		)	(906		)	(842		)
Other current assets	(648		)	(576		)	1,933
Accounts payable and other accrued expenses	(7,886		)	12,341			21,472
Other, net	991			5,885			(4,715		)
Net cash provided by operating activities	66,820			138,982			116,967
Investing Activities:
Acquisition of business, net of cash received	(77,969		)	(60,191		)	(133,943		)
Isola asset acquisition	(43,434		)	—			—
Capital expenditures	(47,115		)	(27,215		)	(18,136		)
Proceeds from the sale of property, plant and equipment, net	1,081			8,095			—
Proceeds from insurance claims	—			1,041			275
Net cash used in investing activities	(167,437		)	(78,270		)	(151,804		)
Financing Activities:
Proceeds from borrowings under revolving credit facility	102,500			—			166,000
Line of credit issuance costs	—			(1,169		)	—
Repayment of debt principal and capital lease obligations	(6,162		)	(110,689		)	(103,760		)
Payments of taxes related to net share settlement of equity awards	(6,600		)	(5,309		)	(1,377		)
Proceeds from the exercise of stock options, net	861			895			858
Proceeds from issuance of shares to employee stock purchase plan	1,082			3,085			4,143
Share repurchases	(2,999		)	—			(7,995		)
Net cash provided by (used in) financing activities	88,682			(113,187		)	57,869
Effect of exchange rate fluctuations on cash	(1,486		)	5,867			149
Net increase (decrease) in cash and cash equivalents	(13,421		)	(46,608		)	23,181
Cash and cash equivalents at beginning of period	181,159			227,767			204,586
Cash and cash equivalents at end of period	$	167,738		$	181,159		$	227,767
Supplemental Disclosures:
Accrued capital additions	$	2,744		$	2,376		$	1,081
Assets obtained under leasing arrangements	$	—		$	883		$	—
Cash paid during the year for:
Interest, net of amounts capitalized	$	7,040		$	5,787		$	3,924
Income taxes	$	29,161		$	36,918		$	23,952

The accompanying notes are an integral part of the consolidated financial statements.

41

ROGERS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1 – Basis of Presentation, Organization and Summary of Significant Accounting Policies

As used herein, the terms “Company,” “Rogers,” “we,” “us,” “our” and similar terms mean Rogers Corporation and its subsidiaries, unless the context indicates otherwise.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and our wholly-owned subsidiaries, after elimination of inter-company accounts and transactions. The preparation of financial statements, in conformity with accounting principles generally accepted in the United States (U.S. GAAP), requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassification

On January 1, 2018, the Company adopted ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. Upon adoption, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from “Selling, general and administrative expenses” to “Other income (expense), net” for the years ended December 31, 2017 and 2016, respectively. Refer to “Note 19 – Recent Accounting Standards” for further information.

Organization

Our reporting structure is comprised of three strategic operating segments: Advanced Connectivity Solutions (ACS), Elastomeric Material Solutions (EMS) and Power Electronics Solutions (PES). The remaining operations are accumulated and reported as our Other operating segment.

Advanced Connectivity Solutions

Our ACS operating segment designs, develops, manufactures and sells circuit materials and solutions enabling high-performance and high-reliability connectivity for applications in wireless infrastructure (e.g., power amplifiers, antennas, small cells and distributed antenna systems), automotive (e.g., active safety, advanced driver assistance systems, telematics and thermal management), aerospace and defense, connected devices (e.g., mobile internet devices and Internet of Things), wired infrastructure (e.g., computing and IP infrastructure) and consumer electronics. We believe these products have characteristics that offer performance and other functional advantages in many market applications that serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits. Trade names for our ACS products include: RO3000^®, RO4000^®, RT/duroid^®, TMM^®, AD Series^TM and CLTE Series^TM. As of December 31, 2018, our ACS operating segment had manufacturing and administrative facilities in Chandler, Arizona; Rogers, Connecticut; Bear, Delaware; Evergem, Belgium; and Suzhou, China.

Elastomeric Material Solutions

Our EMS operating segment designs, develops, manufactures and sells engineered material solutions for a wide variety of applications and end markets. These include polyurethane and silicone materials used in critical cushioning, sealing and vibration management applications for portable electronics (e.g., smart phones), automotive, aerospace, rail, footwear and printing end markets; customized silicones used in flex heater and semiconductor thermal applications; polytetrafluoroethylene and ultra-high molecular weight polyethylene materials used in wire and cable, pressure-sensitive tapes and automotive applications. We believe these materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers’ products from other commonly available materials. EMS products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs). Trade names for our EMS products include: PORON^®, BISCO^®, DeWAL^®, ARLON^®, DSP^®, Griswold^®, eSORBA^®, XRD^®, HeatSORB™ and R/bak^®.

In July 2018, we acquired Griswold LLC (Griswold), a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions. In January 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), a custom silicone product development and manufacturing business, serving a wide range of high reliability applications, and in November 2016, we acquired DeWAL Industries LLC (DeWAL), a manufacturer of polytetrafluoroethylene and ultra-high molecular weight polyethylene films, pressure sensitive tapes and specialty products for the industrial, aerospace, automotive, and electronics markets. The acquisitions of Griswold, DSP and DeWAL, and their subsequent integration into our EMS operating segment, have enabled us to increase scale and complement our existing product offerings, thus enhancing our ability to support our customers.

As of December 31, 2018, our EMS operating segment had administrative and manufacturing facilities in Moosup, Connecticut; Rogers, Connecticut; Woodstock, Connecticut; Bear, Delaware; Carol Stream, Illinois; Narragansett, Rhode Island; Santa Fe

42

Springs, California; Ansan, South Korea; and Suzhou, China. We also own 50% of: (1) Rogers Inoac Corporation (RIC), a joint venture established in Japan to design, develop, manufacture and sell PORON products predominantly for the Japanese market and (2) Rogers INOAC Suzhou Corporation (RIS), a joint venture established in China to design, develop, manufacture and sell PORON products primarily for RIC customers in various Asian countries. INOAC Corporation owns the remaining 50% of both RIC and RIS. RIC has manufacturing facilities at the INOAC facilities in Nagoya and Mie, Japan, and RIS has manufacturing facilities at Rogers’ facilities in Suzhou, China.

Power Electronics Solutions

Our PES operating segment designs, develops, manufactures and sells ceramic substrate materials for power module applications (e.g., variable frequency drives, vehicle electrification and renewable energy), laminated busbars for power inverter and high power interconnect applications (e.g., mass transit, hybrid-electric and electric vehicles, renewable energy and variable frequency drives) and micro-channel coolers (e.g., laser cutting equipment). We sell our ceramic substrate materials and micro channel coolers under the curamik^® trade name, and our busbars under the ROLINX^® trade name. As of December 31, 2018, our PES operating segment had manufacturing and administrative facilities in Evergem, Belgium; Eschenbach, Germany; Budapest, Hungary; and Suzhou, China.

Other

Our Other operating segment consists of elastomer components for applications in ground transportation, office equipment, consumer and other markets; elastomer floats for level sensing in fuel tanks, motors, and storage tanks; and inverters for portable communications and automotive markets. Trade names for our elastomer components include: NITROPHYL^® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR^® elastomer rollers.

Summary of Significant Accounting Policies

Cash Equivalents

Highly liquid investments with original maturities of three months or less are considered cash equivalents. These investments are stated at cost, which approximates fair value.

Investments in Unconsolidated Joint Ventures

We account for our investments in and advances to unconsolidated joint ventures, both of which are 50% owned, using the equity method of accounting.

Foreign Currency

All balance sheet accounts of foreign subsidiaries are translated or remeasured at exchange rates in effect at each year end, and income statement items are translated using the average exchange rates for the year. Translation adjustments for those entities that operate under a local currency are recorded directly to a separate component of shareholders’ equity, while remeasurement adjustments for those entities that operate under the parent’s functional currency are recorded to the income statement as a component of “Other income (expense), net.” Currency transaction gains and losses are reported as income or expense, respectively, in the consolidated statements of operations as a component of “Other income (expense), net.” Such adjustments resulted in losses of $0.7 million in 2018, gains of $0.9 million in 2017 and losses of $2.7 million in 2016.

Allowance for Doubtful Accounts

The allowance for doubtful accounts is determined based on a variety of factors that affect the potential collectability of the related receivables, including the length of time receivables are past due, customer credit ratings, financial stability of customers, specific one-time events and past customer history. In addition, in circumstances where we are made aware of a specific customer’s inability to meet its financial obligations, a specific allowance is established. The majority of accounts are individually evaluated on a regular basis and appropriate reserves are established as deemed appropriate based on the criteria previously mentioned. The remainder of the reserve is based on our estimates and takes into consideration historical trends, market conditions and the composition of our customer base.

Inventories

Inventories are stated at the lower of cost or net realizable value. The cost of inventories is determined using the first in, first out (FIFO) method. An allowance is made for estimated losses due to obsolescence. The allowance is determined for groups of products based on purchases in the recent past and/or expected future demand and market conditions. Abnormal amounts of idle facility expense and waste are not capitalized in inventory. The allocation of fixed production overheads to the inventory cost is based on the normal capacity of the production facilities.

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Inventories consisted of the following:

	As of December 31,
(Dollars in thousands)	2018		2017
Raw materials	$	59,321	$	43,092
Work-in-process	30,086		28,133
Finished goods	43,230		41,332
Total inventories	$	132,637	$	112,557

Property, Plant and Equipment

Property, plant and equipment are stated on the basis of cost. For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

Software Costs

We capitalize certain computer software and software development costs incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, and (ii) compensation and related benefits for employees who are directly associated with the software project. Capitalized software costs are amortized on a straight-line basis when placed into service over the estimated useful lives of the software, which approximates three to five years. Net capitalized software and development costs were $1.7 million and $4.7 million for the years ended December 31, 2018 and 2017, respectively. Capitalized software is included within “Property, plant and equipment, net of accumulated depreciation” in the consolidated statements of financial position.

Goodwill and Other Intangible Assets

We have made acquisitions over the years that included the recognition of intangible assets. Intangible assets are classified into three categories: (1) goodwill; (2) other intangible assets with definite lives subject to amortization; and (3) other intangible assets with indefinite lives not subject to amortization. Other intangible assets can include items such as trademarks and trade names, licensed technology, customer relationships and covenants not to compete, among other things. Each definite-lived other intangible asset is amortized over its respective economic useful life using the economic attribution method.

Goodwill is tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that our goodwill is impaired, then we compare the estimated fair value of each of our reporting units to their respective carrying value. If a reporting unit’s carrying value is greater than its fair value, then an impairment is recognized for the excess and charged to operations. We currently have four reporting units with goodwill: ACS, EMS, curamik^® and Elastomer Components Division (ECD). Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018.

The application of the annual goodwill impairment test requires significant judgment, including the identification of reporting units, assignment of assets and liabilities to reporting units and determination of the fair value of each reporting unit. Determining the fair value is subjective and requires the use of significant estimates and assumptions, including financial projections for net sales, gross margin and operating margin, discount rates, terminal year growth rates and future market conditions, among others. We estimated the fair value of our reporting units using an income approach based on the present value of future cash flows through a five year discounted cash flow analysis. The discounted cash flow analysis utilized the discount rates for each of the reporting units ranging from 11.25% for EMS to 12.90% for ECD, and terminal year growth rates ranging from 4.9% for curamik^® to 5.9% for ACS. We believe this approach yields the most appropriate evidence of fair value as our reporting units are not easily compared to other corporations involved in similar businesses. We further believe that the assumptions and rates used in our annual goodwill impairment test are reasonable, but inherently uncertain. There were no impairment charges resulting from our goodwill impairment analysis for the year ended December 31, 2018. Our ACS, EMS, curamik^® and ECD reporting units had allocated goodwill of approximately $51.7 million, $142.6 million, $68.4 million and $2.2 million respectively, as of December 31, 2018.

Indefinite-lived other intangible assets are tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that an indefinite-lived other intangible

44

asset is impaired, then we compare the estimated fair value of that indefinite-lived other intangible asset to its respective carrying value. If an indefinite-lived other intangible asset’s carrying value is greater than its fair value, then an impairment charge is recognized for the excess and charged to operations. Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018. The application of the annual indefinite-lived other intangible asset impairment test requires significant judgment, including the determination of fair value of each indefinite-lived other intangible asset. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our indefinite-lived other intangible assets impairment analysis for the year ended December 31, 2018. The curamik^® reporting unit had an indefinite-lived other intangible asset of approximately $4.5 million as of December 31, 2018.

Definite-lived other intangible assets are tested for recoverability whenever events or changes in circumstances indicate the carrying value may not be recoverable. The recoverability test involves comparing the estimated sum of the undiscounted cash flows for each definite-lived other intangible asset to its respective carrying value. If a definite-lived other intangible asset’s carrying value is greater than the sum of its undiscounted cash flows, then the definite-lived other intangible asset’s carrying value is compared to its estimated fair value and an impairment charge is recognized for the excess and charged to operations. The application of the recoverability test requires significant judgment, including the identification of the asset group and determination of undiscounted cash flows and fair value of the underlying definite-lived other intangible asset. Determination of undiscounted cash flows requires the use of significant estimates and assumptions, including certain financial projections. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our definite-lived other intangible assets impairment analysis for the year ended December 31, 2018. Our ACS, EMS and curamik^® reporting units had definite-lived other intangible assets of approximately $7.9 million, $152.2 million and $12.4 million, respectively, as of December 31, 2018.

Environmental and Product Liabilities

We accrue for our environmental investigation, remediation, operating and maintenance costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. For environmental matters, the most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. For sites with multiple potential responsible parties (PRPs), we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. When no amount within a range of estimates is more likely to occur than another, we accrue to the low end of the range and disclose the range. When future liabilities are determined to be reimbursable by insurance coverage, an accrual is recorded for the potential liability and a receivable is recorded for the estimated insurance reimbursement amount. We are exposed to the uncertain nature inherent in such remediation and the possibility that initial estimates will not reflect the final outcome of a matter.

We review our asbestos-related projections annually in the fourth quarter of each year unless facts and circumstances materially change during the year, at which time we would analyze these projections. We believe the assumptions made on the potential exposure and expected insurance coverage are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation. Our estimates of asbestos-related contingent liabilities and related insurance receivables are based on an independent actuarial analysis and an independent insurance usage analysis prepared annually by third parties. The actuarial analysis contains numerous assumptions, including number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, average settlement costs, average defense costs, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these assumptions are subject to even greater uncertainty as the projection period lengthens. The insurance usage analysis considers, among other things, applicable deductibles, retentions and policy limits, the solvency and historical payment experience of various insurance carriers, the likelihood of recovery as estimated by external legal counsel and existing insurance settlements.

We believe the assumptions used in our models for determining our potential exposure and related insurance coverage are reasonable at the present time, but such assumptions are inherently uncertain. Given the inherent uncertainty in making projections, we plan to re-examine periodically the assumptions used in the projections of current and future asbestos claims, and we will update them if needed based on our experience, changes in the assumptions underlying our models, and other relevant factors, such as changes in the tort system. There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we may incur additional charges for our asbestos liabilities and defense costs in the future, that could exceed existing reserves and insurance recovery. We plan to continue to vigorously defend ourselves and believe we have unutilized insurance coverage to mitigate future costs related to this matter.

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Fair Value of Financial Instruments

Management believes that the carrying values of financial instruments, including cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities approximate fair value based on the maturities of these instruments. The fair value of our borrowings under credit facility are determined using discounted cash flows based upon our estimated current interest cost for similar type borrowings or current market value, which falls under Level 2 of the fair value hierarchy. Based on our credit characteristics as of December 31, 2018, borrowings would generally bear interest at LIBOR plus 150.0 basis points. As the current borrowings under our Third Amended Credit Agreement bear interest at adjusted 1-month LIBOR plus 150.0 basis points, we believe the carrying value of our borrowings approximates fair value. For additional information on the calculation of fair value measurements, refer to “Note 2 – Fair Value Measurements.”

Hedging Transactions and Derivative Financial Instruments

From time to time, we use derivative instruments to manage commodity, interest rate and foreign currency exposures. Derivative instruments are viewed as risk management tools and are not used for trading or speculative purposes. To qualify for hedge accounting treatment, derivatives used for hedging purposes must be designated and deemed effective as a hedge of the identified underlying risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.

Derivatives used to hedge forecasted cash flows associated with interest rates, foreign currency commitments, or forecasted commodity purchases are accounted for as cash flow hedges. For those derivative instruments that qualify for hedge accounting treatment, if the hedge is highly effective, all changes in the fair value of the derivative hedging instrument are recorded in other comprehensive income (loss). The derivative hedging instrument will be reclassified to earnings when the hedged item impacts earnings. For those derivative instruments that do not qualify for hedge accounting treatment, any related gains and losses are recognized in the consolidated statements of operations as a component of “Other income (expense), net.” For additional information, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

Concentration of Credit and Investment Risk

We extend credit on an uncollateralized basis to almost all customers. Concentration of credit and geographic risk with respect to accounts receivable is limited due to the large number and general dispersion of accounts that constitute our customer base. We routinely perform credit evaluations on our customers. As of December 31, 2018 and 2017, there were no customers that individually accounted for more than 10% of total accounts receivable. We have purchased credit insurance coverage for certain accounts receivable. We did not experience significant credit losses on customers’ accounts in 2018, 2017 or 2016.

We are subject to credit and market risk by using derivative instruments. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value of the derivative instrument. We seek to minimize counterparty credit (or repayment) risk by entering into derivative transactions with major financial institutions with investment grade credit ratings.

We invest excess cash principally in investment grade government securities and time deposits. We have established guidelines relative to diversification and maturities in order to maintain safety and liquidity. These guidelines are periodically reviewed and modified to reflect changes in market conditions.

Income Taxes

We are subject to income taxes in the United States and in numerous foreign jurisdictions. The Company accounts for income taxes following Accounting Standards Codification (ASC) 740, Income Taxes, recognizing deferred tax assets and liabilities using enacted tax rates for the effect of temporary differences between book and tax basis of recorded assets and liabilities. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some or all of a deferred tax asset will not be realized.

As a result of the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform), all post-1986 undistributed foreign subsidiary earnings and profits as of December 31, 2018 have been subjected to U.S. tax through the transition tax. Our unremitted foreign earnings could be subject to additional income taxes if they are redeployed outside of their country of origin. The Company did not make any changes in 2018 to its position on the permanent reinvestment of its historical earnings from foreign operations. With the exception of certain Chinese subsidiaries, the Company continues to assert that historical foreign earnings are indefinitely reinvested. As of December 31, 2018 and 2017, the Company had recorded a deferred tax liability of $1.8 million and $3.1 million, respectively, for Chinese withholding tax on undistributed earnings that are not indefinitely reinvested. The other remaining foreign subsidiaries have both the intent and ability to indefinitely reinvest their undistributed earnings and the Company does not expect that these undistributed earnings should give rise to significant additional tax liabilities as a result of such earnings. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes.”

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in

46

reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we have completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and development credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities.

U.S. Tax Reform includes two new U.S. tax base erosion provisions, the Global Intangible Low-Taxed Income (GILTI) provisions and the Base Erosion and Anti-Abuse Tax (BEAT) provisions. The GILTI provisions require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary's tangible assets. The Company has elected to account for GILTI tax in the period in which it is incurred, and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the year ended December 31, 2018. The BEAT provisions eliminate the deduction of certain base-erosion payments made to related foreign corporations, and impose a minimum tax if greater than regular tax. Starting January 1, 2018, the Company has accounted for BEAT in the period in which it is incurred to the extent the Company is subject to it. We have determined that our base erosion payments do not exceed the threshold for applicability for the year ended December 31, 2018 and we do not currently anticipate any significant long-term impact from the BEAT on our effective tax rate in future periods.

We record benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain position is recognized. If the threshold is met, we recognize the largest amount of the tax benefit that is greater than fifty percent likely to be realized upon ultimate settlement.

We recognize interest and penalties within the “Income tax expense” line item in the consolidated statements of operations. Accrued interest and penalties are included within the related tax liability line item in the consolidated statements of financial position.

Revenue Recognition

Recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. We recognize revenue when all of the following criteria are met: (1) we have entered into a binding agreement, (2) the performance obligations have been identified, (3) the transaction price to the customer has been determined, (4) the transaction price has been allocated to the performance obligations in the contract, and (5) the performance obligations have been satisfied. The majority of our shipping terms permit us to recognize revenue at point of shipment. Some shipping terms require the goods to be through customs or be received by the customer before title passes. In those instances, revenue is not recognized until either the customer has received the goods or they have passed through customs, depending on the circumstances. Shipping and handling costs are treated as fulfillment costs. Sales tax or VAT are excluded from the measurement of the transaction price.

Pension and Other Postretirement Benefits

We provide various defined benefit pension plans for our U.S. employees and we sponsor multiple fully insured or self-funded medical plans and fully insured life insurance plans for retirees. In 2013, the defined benefit pension plans were frozen, so that future benefits no longer accrue. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rate of return on plan assets, mortality rates, and other factors. The assumptions used in these models are determined as follows: (i) the discount rate used is based on the PruCurve index; (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market results and our expectations of future returns, as well as current market assumptions related to long-term return rates; and (iii) the mortality rate is based on a mortality projection that estimates current longevity rates and their impact on the long-term plan obligations. We review these assumptions periodically throughout the year and update as necessary.

In October 2017, the Company merged two of its defined benefit pension plans: the Rogers Corporation Defined Benefit Pension Plan and the Hourly Employees Pension Plan of Arlon LLC, Microwave Material and Silicone Technologies Divisions, Bear, Delaware (collectively, the Merged Plan). The Company currently intends to terminate the Merged Plan and has requested a determination letter from the Internal Revenue Service (IRS). The termination of the Merged Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Merged Plan and we expect the settlement process to be completed in 2019. The Company lacks sufficient information as of December 31, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Rogers Corporation Employees’ Pension Plan (the Union Plan). For additional information, refer to “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans.”

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Advertising Costs

Advertising costs are expensed as incurred and amounted to $3.8 million, $4.4 million and $3.0 million for 2018, 2017 and 2016, respectively.

Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding.

Equity Compensation

Equity compensation mainly consists of expense related to restricted stock units and deferred stock units.

Performance-based restricted stock unit compensation expense is based on achievement of both market and service conditions. The fair value of these awards is determined based on a Monte Carlo simulation valuation model on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards.

Time-based restricted stock units compensation expense is based on the achievement of only service conditions. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period.

Deferred stock units, which are granted to non-management directors, are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. The compensation related to these grants is expensed immediately on the date of grant.

Note 2 – Fair Value Measurements

The accounting guidance for fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value.

• Level 1 – Quoted prices in active markets for identical assets or liabilities.

• Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

From time to time we enter into various instruments that require fair value measurement, including foreign currency contracts, copper derivative contracts and interest rate swaps. Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:

	Derivative Instruments at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Foreign currency contracts	$	—	$	522	$	—	$	522
Copper derivative contracts	$	—	$	583	$	—	$	583
Interest rate swap	$	—	$	461	$	—	$	461

	Derivative Instruments at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2			Level 3		Total
Foreign currency contracts	$	—	$	(396	)	$	—	$	(396	)
Copper derivative contracts	$	—	$	2,016		$	—	$	2,016
Interest rate swap	$	—	$	41		$	—	$	41

For further discussion on our derivative contracts, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

Note 3 – Hedging Transactions and Derivative Financial Instruments

We are exposed to certain risks related to our ongoing business operations. The primary risks being managed through our use of derivative instruments are foreign currency exchange rate risk and commodity pricing risk (primarily related to copper). During

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2017, we entered into an interest rate swap to hedge interest rate risk. We do not use derivative financial instruments for trading or speculative purposes. The valuation of derivative contracts used to manage each of these risks is described below:

• Foreign Currency - The fair value of any foreign currency option derivative is based upon valuation models applied to current market information such as strike price, spot rate, maturity date and volatility, and by reference to market values resulting from an over-the-counter market or obtaining market data for similar instruments with similar characteristics.

• Commodity - The fair value of copper derivatives is computed using a combination of intrinsic and time value valuation models, which are collectively a function of five primary variables: price of the underlying instrument, time to expiration, strike price, interest rate and volatility. The intrinsic valuation model reflects the difference between the strike price of the underlying copper derivative instrument and the current prevailing copper prices in an over-the-counter market at period end. The time value valuation model incorporates changes in the price of the underlying copper derivative instrument, the time value of money, the underlying copper derivative instrument’s strike price and the remaining time to the underlying copper derivative instrument’s expiration date from the period end date.

• Interest Rates- The fair value of interest rate swap instruments is derived by comparing the present value of the interest rate forward curve against the present value of the swap rate, relative to the notional amount of the swap. The net value represents the estimated amount we would receive or pay to terminate the agreements. Settlement amounts for an “in the money” swap would be adjusted down to compensate the counterparty for cost of funds, and the adjustment is directly related to the counterparties’ credit ratings.

The guidance for the accounting and disclosure of derivatives and hedging transactions requires companies to recognize all of their derivative instruments as either assets or liabilities at fair value in the statements of financial position. The accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies for hedge accounting treatment as defined under the applicable accounting guidance. For derivative instruments that are designated and qualify for hedge accounting treatment as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (loss). This gain or loss is reclassified into earnings in the same line item of the consolidated statements of operations associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. As of December 31, 2018 and 2017, only our interest rate swap qualified for hedge accounting treatment as a cash flow hedge, and the hedge was highly effective.

Foreign Currency

During 2018, we entered into Korean Won, Japanese Yen, Euro, Hungarian Forint and Chinese Renminbi forward contracts. We entered into these foreign currency forward contracts to mitigate certain global transactional exposures. These contracts do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in “Other income (expense), net” in our consolidated statements of operations in the period in which the adjustment occurred.

As of December 31, 2018 the notional values of these foreign currency forward contracts were as follows:

Notional Values of Foreign Currency Derivatives
KRW/USD	₩	1,325,760,000
JPY/EUR	¥	675,000,000
EUR/USD	€	10,449,335
USD/CNY	$	23,655,942

Commodity

As of December 31, 2018, we had 26 outstanding contracts to hedge exposure related to the purchase of copper in our PES and ACS operating segments. These contracts are held with financial institutions and are intended to offset rising copper prices and do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in“Other income (expense), net” in our consolidated statements of operations in the period in which the adjustment occurred.

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As of December 31, 2018, the volume of our copper contracts outstanding were as follows:

Volume of Copper Derivatives
January 2019 - March 2019	189 metric tons per month
April 2019 - June 2019	188 metric tons per month
July 2019 - September 2019	191 metric tons per month
October 2019 - December 2019	195 metric tons per month
January 2020 - March 2020	202 metric tons per month

Interest Rates

In March 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. For additional information regarding our revolving credit facility, refer to “Note 11 – Debt and Capital Leases.”

Effects on Financial Statements

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2018			Fair Values of Derivative Instruments as of December 31, 2018
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(333	)	$	522
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	(2,101	)	$	583
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	420		$	461

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2017			Fair Values of Derivative Instruments as of December 31, 2017
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(7	)	$	(396	)
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	1,928		$	2,016
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	41		$	41

⁽¹⁾ All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2018 interest rate swap balance, which was recorded in the “Other long-term assets” line item in the consolidated statements of financial position.

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Note 4 – Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive loss by component for the years ended December 31, 2018 and 2017 were as follows:

(Dollars and accompanying footnotes in thousands)	Foreign Currency Translation Adjustments			Pension and Other Postretirement Benefits(1)			Derivative Instrument Designated as Cash Flow Hedge(2)			Total
Balance as of December 31, 2016	$	(46,446	)	$	(45,816	)	$	—		$	(92,262	)
Other comprehensive income (loss) before reclassifications	28,463			—			(6		)	28,457
Actuarial net loss incurred in the fiscal year	—			(1,481		)	—			(1,481		)
Amounts reclassified from accumulated other comprehensive loss	—			99			32			131
Net current-period other comprehensive income (loss)	28,463			(1,382		)	26			27,107
Balance as of December 31, 2017	(17,983		)	(47,198		)	26			(65,155		)
Other comprehensive income (loss) before reclassifications	(12,505		)	—			519			(11,986		)
Actuarial net loss incurred in the fiscal year	—			(1,678		)	—			(1,678		)
Amounts reclassified from accumulated other comprehensive loss	—			176			(191		)	(15		)
Net current-period other comprehensive income (loss)	(12,505		)	(1,502		)	328			(13,679		)
Balance as of December 31, 2018	$	(30,488	)	$	(48,700	)	$	354		$	(78,834	)

⁽¹⁾ Net of taxes of $9,984, $9,563 and $9,160 for the years ended December 31, 2018, 2017 and 2016, respectively.

⁽²⁾ Net of taxes of $106, $15 and $0 for the years ended December 31, 2018, 2017 and 2016, respectively.

The impacts to the statements of operations related to reclassifications from accumulated other comprehensive loss for the years ended December 31, 2018 and 2017 were as follows:

(Dollars in thousands)	December 31, 2018			December 31, 2017			Financial Statement Line Item
Amortization of pension and other postretirement benefits
	$	(227	)	$	(154	)	Other income (expense), net(1)
	51			55			Income tax expense
	$	(176	)	$	(99	)	Net income
Unrealized gains (losses) on derivative instruments held at year end
	$	247		$	(51	)	Other income (expense), net
	(56		)	19			Income tax expense
	$	191		$	(32	)	Net income

⁽¹⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. For additional details, refer to “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans.”

Note 5 – Acquisitions

Griswold

On July 6, 2018, we acquired 100% of the membership interests in Griswold for an aggregate purchase price of $78.0 million, net of cash acquired, pursuant to the terms of the Membership Interest Purchase Agreement, dated July 6, 2018 by and among the Company and the owners of Griswold (the MIPA). We used borrowings of $82.5 million under our revolving credit facility to fund the acquisition. There was a possible earn-out capped at $3.0 million based on certain of Griswold’s 2018 product sales. At the time of acquisition, we determined that the probability of the earn-out was extremely low, and as a result, assigned no fair value to the contingent consideration as of the valuation date. No earn-out was actually paid based on the related sales results.

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Griswold is a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions across the automotive, transportation, medical, office products, printing and electronics industries. The acquisition built on our existing EMS platform of engineered materials and added new products and capabilities to the portfolio of our EMS operating segment.

The acquisition has been accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill primarily related to the expected synergies from combining operations and the value of Griswold’s existing workforce, which is expected to be deductible for tax purposes. We also recorded other intangible assets related to acquired customer relationships, developed technology, trademarks and trade names, and a covenant not to compete.

The following table represents the fair values assigned to the acquired assets and liabilities assumed in the transaction. As of the filing date of this Form 10-K, the purchase accounting and purchase price allocation for the Griswold acquisition are substantially complete, as we continue to refine our valuation of certain acquired assets and assumed liabilities.

(Dollars in thousands)	July 6, 2018
Assets:
Accounts receivable, less allowance for doubtful accounts	$	2,553
Inventories	2,951
Other current assets	155
Property, plant & equipment	7,554
Other intangible assets	34,120
Goodwill	31,738
Total assets	79,071
Liabilities:
Accounts payable	711
Accrued employee benefits and compensation	299
Other accrued liabilities	92
Total liabilities	1,102
Fair value of net assets acquired	$	77,969

The other intangible assets consist of customer relationships valued at $22.1 million, developed technology valued at $9.6 million, trademarks and trade names valued at $1.8 million, and a covenant not to compete valued at $0.6 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 9.5 years for customer relationships, 3.5 years for developed technology, 10.4 years for trademarks and trade names, and 3.2 years for the covenant not to compete, resulting in amortization expenses ranging from $0.7 million to $3.0 million annually. The estimated annual future amortization expense is $2.8 million for 2019, $3.0 million for 2020, $2.8 million for 2021, $2.7 million for 2022, and $2.5 million for 2023.

During 2018, we incurred transaction costs of $1.1 million related to the Griswold acquisition, which were recorded within selling, general and administrative (SG&A) expenses in the consolidated statements of operations.

The results of Griswold have been included in our consolidated financial statements for the period subsequent to the completion of the acquisition on July 6, 2018, through December 31, 2018. Griswold’s net sales for that period totaled $13.7 million.

DSP

On January 6, 2017, we acquired the principal operating assets of DSP, pursuant to the terms of the Asset Purchase Agreement by and among the Company, DSP and the principal shareholders of DSP (the Purchase Agreement). Pursuant to the terms of the Purchase Agreement, we acquired certain assets and assumed certain liabilities of DSP for a total purchase price of approximately $60.2 million. We used borrowings of $30.0 million under our revolving credit facility in addition to cash on hand to fund the acquisition.

The acquisition was accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill primarily related to the expected synergies from combining operations and the value of the existing workforce. We also recorded other intangible assets related to customer relationships, developed technology, trade names and a covenant not to compete.

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The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	January 6, 2017
Assets:
Accounts receivable	$	2,724
Prepaid expenses	21
Inventory	2,433
Property, plant & equipment	1,589
Other intangible assets	35,860
Goodwill	17,793
Total assets	60,420
Liabilities:
Accounts payable	179
Accrued expenses	50
Total liabilities	229
Fair value of net assets acquired	$	60,191

The other intangible assets consist of customer relationships valued at $30.5 million, developed technology valued at $1.8 million, trademarks valued at $3.3 million, and a covenant not to compete valued at $0.3 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 11.8 years for customer relationships, 4.3 years for developed technology, 11.7 years for trademarks, and 4.1 years for the covenant not to compete, resulting in amortization expenses ranging from $1.1 million to $2.0 million annually. The estimated annual future amortization expense is $1.8 million for each of 2019, 2020 and 2021, and $1.7 million for each of 2022 and 2023.

During 2017, we incurred transaction costs of $0.5 million related to the DSP acquisition, which were recorded within SG&A expenses in the consolidated statements of operations. DSP’s net sales totaled $22.3 million for the year ended December 31, 2017.

DeWAL

On November 23, 2016, we acquired all of the membership interests in DeWAL pursuant to the terms of the Membership Interest Purchase Agreement, dated November 23, 2016, by and among the Company and the owners of DeWAL for an aggregate purchase price of $135.5 million. We used borrowings of $136.0 million under our revolving credit facility to fund the acquisition.

The acquisition was accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill, primarily related to the expected synergies from combining operations and the value of the existing workforce. We also recorded other intangible assets related to customer relationships, developed technology, trade names and covenants not to compete.

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The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	November 23, 2016
Assets:
Cash and cash equivalents	$	1,539
Accounts receivable	7,513
Other current assets	691
Inventory	9,915
Property, plant & equipment	9,932
Other intangible assets	73,500
Goodwill	35,985
Other long-term assets	101
Total assets	139,176
Liabilities:
Accounts payable	2,402
Other current liabilities	1,292
Total liabilities	3,694
Fair value of net assets acquired	$	135,482

The other intangible assets consist of customer relationships valued at $46.7 million, developed technology valued at $22.0 million, trademarks valued at $4.3 million, and covenants not to compete valued at $0.5 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 13.5 years for customer relationships, 8.6 years for developed technology, 5.2 years for trademarks, and 3.8 years for the covenants not to compete, resulting in amortization expenses ranging from $2.4 million to $4.3 million, annually. The future estimated annual amortization expense is $4.1 million for 2019, $4.3 million for each of 2020, 2021, 2022 and 2023.

During 2016, we incurred transaction costs of $2.1 million related to the DeWAL acquisition, which were recorded within SG&A expenses in the consolidated statements of operations. DeWAL’s net sales totaled $5.4 million for the year ended December 31, 2016.

Pro Forma Financial Information

The following unaudited pro forma financial information presents the combined results of operations of Rogers, Griswold, DSP, and DeWAL as if the Griswold acquisition had occurred on January 1, 2017, the DSP acquisition had occurred on January 1, 2016 and the DeWAL acquisition had occurred on January 1, 2015. The unaudited pro forma financial information is not intended to represent or be indicative of our consolidated results of operations that would have been reported had the Griswold, DSP, and DeWAL acquisitions been completed as of January 1, 2017, January 1, 2016 and January 1, 2015, respectively, and should not be taken as indicative of our future consolidated results of operations.

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	893,878	$	851,122	$	724,877
Net income	87,584		80,283		50,349

Isola Asset Acquisition

On August 28, 2018, the Company entered into an Asset Purchase Agreement (APA) with Isola USA Corp. (Isola) to acquire a production facility and related machinery and equipment located in Chandler, Arizona for cash consideration of $43.4 million. In connection with the APA, the Company also entered into a Transition Services Agreement and a Lease Agreement with Isola whereby Isola leases back a portion of the facility and related machinery and equipment from the Company during the transition period through December 31, 2019. We used cash on hand to fund the asset purchase. This transaction was evaluated under ASC 805, Business Combinations and was determined to be an asset acquisition as the transaction did not meet the definition of a business.

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The assets acquired in connection with the acquisition were recorded by the Company at their estimated relative fair values as follows:

(Dollars in thousands)	August 28, 2018
Land	$	6,104
Buildings	8,401
Machinery and equipment	18,616
Equipment in process	12,633
Total property, plant and equipment	$	45,754

The $45.8 million of capitalized cost summarized above includes both lease consideration valued at $2.0 million and transaction costs incurred of $0.4 million.

Note 6 – Property, Plant and Equipment

	As of December 31,
(Dollars in thousands)	2018			2017
Land	$	21,525		$	14,620
Buildings and improvements	175,279			135,191
Machinery and equipment	256,301			238,000
Office equipment	64,886			56,554
Property plant and equipment, gross	517,991			444,365
Accumulated depreciation	(317,414		)	(289,909		)
Property, plant and equipment, net	200,577			154,456
Equipment in process	42,182			25,155
Total property, plant and equipment, net	$	242,759		$	179,611

Depreciation expense was $33.5 million in 2018, $29.3 million in 2017 and $26.6 million in 2016. Additionally, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition.

In the second quarter of 2017, we began actively marketing for sale unutilized property in Chandler, Arizona, consisting of a building and two adjacent parcels of land with an aggregate net book value of $0.9 million. In the second quarter of 2018, we completed the sale of the building and one parcel of land and recognized a gain on sale of approximately $0.4 million in operating income. The remaining parcel of land, which was previously classified as held for sale, had a net book value of $0.4 million and was reclassified in the third quarter of 2018 to held and used as the initial held for sale classification had surpassed one year.

In the third quarter of 2017, we completed the sale of a facility located in Belgium that had been classified as held for sale as of June 30, 2017 and recognized a gain on sale of approximately $4.4 million in operating income.

In the first quarter of 2017, we completed the planned sale of a parcel of land in Belgium that had been classified as held for sale as of December 31, 2016 and recognized a gain on sale of approximately $0.9 million in operating income.

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Note 7 – Goodwill and Other Intangible Assets

On July 6, 2018, we acquired Griswold. For further detail on the goodwill and other intangible assets recorded in connection with the acquisition, refer to “Note 5 – Acquisitions.”

Goodwill

The changes in the carrying amount of goodwill for the period ending December 31, 2018, by operating segment, were as follows:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions			Power Electronics Solutions			Other		Total
December 31, 2017	$	51,693	$	111,575		$	71,615		$	2,224	$	237,107
Acquisition	—		32,305			—			—		32,305
Purchase accounting adjustment	—		(567		)	—			—		(567		)
Foreign currency translation adjustment	—		(724		)	(3,236		)	—		(3,960		)
December 31, 2018	$	51,693	$	142,589		$	68,379		$	2,224	$	264,885

Other Intangible Assets

The changes in the carrying amount of other intangible assets for the two-year period ending December 31, 2018, were as follows:

	December 31, 2018						December 31, 2017
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	149,753	$	30,078	$	119,675	$	128,907	$	22,514	$	106,393
Technology	81,535		38,624		42,911		73,891		33,491		40,400
Trademarks and trade names	12,019		3,213		8,806		10,213		2,157		8,056
Covenants not to compete	1,340		249		1,091		1,799		1,108		691
Total definite-lived other intangible assets	244,647		72,164		172,483		214,810		59,270		155,540
Indefinite-lived other intangible asset	4,525		—		4,525		4,738		—		4,738
Total other intangible assets	$	249,172	$	72,164	$	177,008	$	219,548	$	59,270	$	160,278

In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations.

Amortization expense was approximately $16.5 million, $14.8 million and $11.2 million in 2018, 2017 and 2016, respectively. The estimated annual future amortization expense is $17.7 million, $14.6 million, $13.8 million, $13.3 million and $12.7 million in 2019, 2020, 2021, 2022 and 2023, respectively. These amounts could vary based on changes in foreign currency exchange rates.

The weighted average amortization period as of December 31, 2018, by definite-lived other intangible asset class, is presented in the table below:

Definite-Lived Other Intangible Asset Class	Weighted Average Remaining Amortization Period
Customer relationships	7.6
Technology	4.4
Trademarks and trade names	5.0
Covenants not to compete	2.1
Total definite-lived other intangible assets	6.6

Note 8 – Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding.

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The following table sets forth the computation of basic and diluted earnings per share:

	Years Ended December 31,
(In thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	87,651	$	80,459	$	48,283
Denominator:
Weighted-average shares outstanding - basic	18,374		18,154		17,991
Effect of dilutive shares	285		393		232
Weighted-average shares outstanding - diluted	18,659		18,547		18,223
Basic earnings per share:	$	4.77	$	4.43	$	2.68
Diluted earnings per share:	$	4.70	$	4.34	$	2.65

Certain options to purchase shares were excluded from the calculation of diluted weighted-average shares outstanding because the exercise price was greater than the average market price of our capital stock during the year. For 2018, 36,642 shares were excluded. No shares were excluded in 2017 and 2016.

Note 9 – Capital Stock and Equity Compensation

Capital Stock

Our 2009 Long-Term Equity Compensation Plan, which expired in early February 2019, permitted the granting of restricted stock units and certain other forms of equity awards to officers and other key employees. Under this plan, we also awarded each non-management director deferred stock units, which permitted non-management directors to receive, at a later date, one share of Rogers capital stock for each deferred stock unit, with no payment of any consideration by the director at the time the shares were received.

Shares of capital stock reserved for possible future issuance were as follows:

	As of December 31,
	2018	2017
Shares reserved for issuance under the stock acquisition program(1)	—	120,883
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan(2)	—	169,044
Shares reserved for issuance under outstanding stock options and restricted stock unit awards	413,294	545,018
Deferred compensation to be paid in stock, including deferred stock units	13,498	17,100
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan(3)	777,385	793,603
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees	106,344	117,987
Total	1,310,521	1,763,635

⁽¹⁾  The Company ceased offering capital stock under the stock acquisition program prior to the periods covered by this table.

⁽²⁾  The Company ceased offering its capital stock as an investment option under the Rogers Employee Savings and Investment Plan prior to the periods covered by this table.

⁽³⁾ This plan expired in early February 2019, and these shares are no longer available for issuance thereunder.

Equity Compensation

Performance-Based Restricted Stock Units

As of December 31, 2018, we had performance-based restricted stock units from 2018, 2017 and 2016 outstanding. These awards generally cliff vest at the end of a three year measurement period. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed during the measurement period. Participants are eligible to be awarded shares ranging from 0% to 200% of the original award amount, based on certain defined performance measures.

The outstanding awards have one measurement criteria: the three year total shareholder return (TSR) on our capital stock as compared to that of a specified group of peer companies. The TSR measurement criteria of the awards is considered a market condition. As such, the fair value of this measurement criteria is determined on the grant date using a Monte Carlo simulation valuation model. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards. We account for forfeitures as they occur.

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Below were the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2018 and 2017:

	September 17, 2018	February 8, 2018	February 9, 2017
Expected volatility	36.6%	34.8%	33.6%
Expected term (in years)	3.0	3.0	3.0
Risk-free interest rate	2.85%	2.28%	1.38%

Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility.

Expected term – We use the vesting period of the award to determine the expected term assumption for the Monte Carlo simulation valuation model.

Risk-free interest rate – We use an implied “spot rate” yield on U.S. Treasury Constant Maturity rates as of the grant date for our assumption of the risk-free interest rate.

Expected dividend yield – We do not currently pay dividends on our capital stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model.

A summary of activity of the outstanding performance-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	169,202		$	97.16	151,769		$	89.72	107,229		$	66.13
Awards granted	75,760		163.55		56,147		110.77		84,443		69.01
Stock issued	(81,230	)	131.72		(34,442	)	86.59		(25,397	)	72.68
Awards forfeited	(21,298	)	114.40		(4,272	)	99.35		(14,506	)	104.83
Awards outstanding as of December 31	142,434		$	110.19	169,202		$	97.16	151,769		$	89.72

We recognized $4.4 million, $4.7 million and $4.6 million of compensation expense related to performance-based restricted stock units for the years ended December 31, 2018, 2017 and 2016, respectively. As of December 31, 2018, there was $6.0 million of total unrecognized compensation cost related to unvested performance-based restricted stock units. That cost is expected to be recognized over a weighted-average period of 0.9 years.

Time-Based Restricted Stock Units

As of December 31, 2018, we had time-based restricted stock unit awards from 2018, 2017 and 2016 outstanding. The outstanding awards all ratably vest on the first, second and third anniversaries of the original grant date. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed subsequent to the last grant anniversary date. Each time-based restricted stock unit represents a right to receive one share of the Rogers’ capital stock at the end of the vesting period. The fair value of the award is determined by the market value of the underlying stock price at the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period. We account for forfeitures as they occur.

A summary of activity of the outstanding time-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	173,331		$	69.10	239,189		$	57.71	208,318		$	64.27
Awards granted	46,810		143.93		80,535		83.17		118,660		51.70
Stock issued	(82,921	)	84.92		(140,208	)	58.18		(60,326	)	64.03
Awards forfeited	(19,744	)	112.06		(6,185	)	60.70		(27,463	)	64.60
Awards outstanding as of December 31	117,476		$	116.10	173,331		$	69.10	239,189		$	57.71

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We recognized $5.6 million, $5.7 million and $5.6 million of compensation expense related to time-based restricted stock units for the years ended December 31, 2018, 2017 and 2016, respectively. As of December 31, 2018, there was $6.7 million of total unrecognized compensation cost related to unvested time-based restricted stock units. That cost is expected to be recognized over a weighted-average period of 0.9 years.

Deferred Stock Units

We grant deferred stock units to non-management directors. These awards are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. Each deferred stock unit results in the issuance of one share of Rogers’ capital stock. The grant of deferred stock units is typically done annually during the second quarter of each year. The fair value of the award is determined by the market value of the underlying stock price at the grant date.

A summary of activity of the outstanding deferred stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	9,250		$	109.48	11,900		$	58.82	23,950		$	27.22
Awards granted	8,400		108.86		9,250		109.48		11,900		58.82
Stock issued	(9,250	)	109.48		(11,900	)	58.82		(23,950	)	52.69
Awards outstanding as of December 31	8,400		$	108.86	9,250		$	109.48	11,900		$	58.82

We recognized compensation expense related to deferred stock units of $0.9 million, $1.0 million and $0.7 million, for the years ended December 31, 2018, 2017 and 2016, respectively.

Stock Options

Stock options have been granted under various equity compensation plans. The maximum contractual term for all options is normally 10 years. We have not granted any stock options since the first quarter of 2012. As of February 2016, all outstanding stock option awards were fully vested and the related compensation cost had been expensed. The total grant-date fair value of stock options that vested during 2016 and the equity compensation expense related to stock options that we recognized in 2016 were both de minimis.

During the years ended December 31, 2018 and 2017, the total intrinsic value of options exercised (i.e., the difference between the market price at time of exercise and the price paid by the individual to exercise the options) was $2.4 million and $6.0 million, respectively. The total amount of cash received from the exercise of these options was $0.9 million and $3.1 million, during the years ended December 31, 2018 and 2017, respectively.

A summary of the activity under our stock option plans for 2018, 2017 and 2016, is presented below:

	2018				2017				2016
	Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share
Options outstanding, vested and exercisable as of January 1	33,283		$	36.40	116,575		$	37.76	212,038		$	40.47
Options exercised	(22,333	)	38.57		(83,292	)	37.04		(95,113	)	43.56
Options forfeited	—		—		—		—		(350	)	44.32
Options outstanding, vested and exercisable as of December 31	10,950		$	31.99	33,283		$	36.40	116,575		$	37.76

As of December 31, 2018 and 2017, our outstanding stock options had a weighted-average remaining contractual life of 2.0 years and 2.2 years, respectively, and an aggregate intrinsic value of $0.7 million and $4.2 million, respectively.

Employee Stock Purchase Plan

We have an ESPP that allows eligible employees to purchase, through payroll deductions, shares of our capital stock at a discount to fair market value. The ESPP has twosix-month offering periods each year, the first beginning in January and ending in June and the second beginning in July and ending in December. The ESPP contains a look-back feature that allows the employee to

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acquire stock at a 15% discount from the underlying market price at the beginning or end of the applicable period, whichever is lower. We recognize compensation expense on this plan ratably over the offering period based on the fair value of the anticipated number of shares that will be issued at the end of each offering period. Compensation expense is adjusted at the end of each offering period for the actual number of shares issued. Fair value is determined based on two factors: (i) the 15% discount on the underlying stock’s market value on the first day of the applicable offering period, and (ii) the fair value of the look-back feature determined by using the Black-Scholes model. We recognized approximately $0.3 million of compensation expense associated with the plan for the year ended December 31, 2018, and $0.5 million for each of the years ended December 31, 2017 and 2016, respectively.

Note 10 – Joint Ventures

As of December 31, 2018, we had two joint ventures, each 50% owned, which are accounted for under the equity method of accounting.

Joint Venture	Location	Operating Segment	Fiscal Year-End
Rogers INOAC Corporation (RIC)	Japan	Elastomeric Material Solutions	October 31
Rogers INOAC Suzhou Corporation (RIS)	China	Elastomeric Material Solutions	December 31

We recognized equity income related to the joint ventures of $5.5 million, $4.9 million and $4.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. These amounts are presented in“Equity income in unconsolidated joint ventures” on our consolidated statements of operations.

The summarized financial information for the joint ventures for the periods indicated was as follows:

	As of December 31,
(Dollars in thousands)	2018		2017
Current assets	$	38,730	$	40,934
Non-current assets	$	4,839	$	4,947
Current liabilities	$	6,376	$	9,519
Shareholders' equity	$	37,193	$	36,362

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	55,465	$	54,597	$	47,321
Gross profit	$	21,229	$	21,462	$	16,829
Net income	$	11,002	$	9,796	$	8,292

Receivables from and payables to joint ventures arise during the normal course of business from transactions between us and the joint ventures. As ofDecember 31, 2018and2017, we had receivables of$1.5 millionand$3.7 million, respectively, due from RIC, RIS, our affiliated partner in the joint ventures, as well as its subsidiaries. These receivables are included in “Accounts receivable, less allowance for doubtful accounts” on our consolidated statements of financial position. As ofDecember 31, 2018and2017, we owed payables of$2.3 millionand$2.1 million, respectively, to RIC and RIS. These payables are included in “Accounts payable” on our consolidated statements of financial position.

Note 11 – Debt and Capital Leases

Debt

On February 17, 2017, we entered into a secured five year credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto (the Third Amended Credit Agreement), which increased the principal amount of our revolving credit facility to up to $450.0 million borrowing capacity, with sublimits for multicurrency borrowings, letters of credit and swing-line notes, and provided an additional $175.0 million accordion feature. Borrowings may be used to finance working capital needs, for letters of credit and for general corporate purposes in the ordinary course of business, including the financing of permitted acquisitions (as defined in the Third Amended Credit Agreement).

In 2018, we borrowed $82.5 million under our revolving credit facility to fund the acquisition of Griswold and an additional $20.0 million to fund the Merged Plan as part of the proposed plan termination process.

Borrowings under the Third Amended Credit Agreement can be made as alternate base rate loans or euro-currency loans. Alternate base rate loans bear interest that includes a base reference rate plus a spread of 37.5 to 75.0 basis points, depending on our leverage ratio. The base reference rate is the greater of the prime rate; federal funds effective rate (or the overnight bank funding rate, if

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greater) plus 50 basis points. Euro-currency loans bear interest based on adjusted LIBOR plus a spread of 137.5 to 175.0 basis points, depending on our leverage ratio. Based on our leverage ratio as of December 31, 2018, the spread was 150.0 basis points.

We incurred interest expense on our outstanding debt of $6.1 million, $5.2 million, and $3.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

In addition to interest payable on the principal amount of indebtedness outstanding from time to time under the Third Amended Credit Agreement, we are required to pay a quarterly fee of 20 to 30 basis points (based upon our leverage ratio) of the unused amount of the lenders’ commitments under the Third Amended Credit Agreement. We incurred an unused commitment fee of $0.6 million, $0.6 million and $0.4 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The Third Amended Credit Agreement contains customary representations, warranties, covenants, mandatory prepayments and events of default under which our payment obligations may be accelerated. If an event of default occurs, the lenders may, among other things, terminate their commitments and declare all outstanding borrowings to be immediately due and payable together with accrued interest and fees. The financial covenants include requirements to maintain (1) a leverage ratio of no more than 3.25 to 1.00, subject to an election to increase the maximum leverage ratio to 3.50 to 1.00 for one fiscal year in connection with a permitted acquisition, and (2) an interest coverage ratio of no less than 3.00 to 1.00.

All obligations under the Third Amended Credit Agreement are guaranteed by each of our existing and future material domestic subsidiaries, as defined in the Third Amended Credit Agreement (the Guarantors). The obligations are also secured by a Third Amended and Restated Pledge and Security Agreement, dated as of February 17, 2017, entered into by us and the Guarantors which grants to the administrative agent, for the benefit of the lenders, a security interest, subject to certain exceptions, in substantially all of the non-real estate assets of the Guarantors. These assets include, but are not limited to, receivables, equipment, intellectual property, inventory, and stock in certain subsidiaries.

All revolving loans are due on the maturity date, February 17, 2022. We are not required to make any quarterly principal payments under the Third Amended Credit Agreement and as of December 31, 2018, we had $228.5 million in outstanding borrowings under our revolving credit facility. However, we made discretionary principal payments totaling $5.0 million and $110.2 million on our revolving credit facility in 2018 and 2017, respectively.

As of December 31, 2018, we had $1.7 million of outstanding line of credit issuance costs that will be amortized over the life of the Third Amended Credit Agreement, which will terminate in February 2022. We recorded amortization expense of $0.6 million and $0.5 million for the years ended December 31, 2018 and 2017, respectively, related to these deferred costs.

In March 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. For further information regarding the interest rate swap, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

Restriction on Payment of Dividends

Our Third Amended Credit Agreement generally permits us to pay cash dividends to our shareholders, provided that (i) no default or event of default has occurred and is continuing or would result from the dividend payment and (ii) our leverage ratio does not exceed 2.75 to 1.00. If our leverage ratio exceeds 2.75 to 1.00, we may nonetheless make up to $20.0 million in restricted payments, including cash dividends, during the fiscal year, provided that no default or event of default has occurred and is continuing or would result from the payments. Our leverage ratio did not exceed 2.75 to 1.00 as of December 31, 2018.

Capital Leases

We have a capital lease obligation related to our manufacturing facility in Eschenbach, Germany. Under the terms of the leasing agreement, we have an option to purchase the property upon the expiration of the lease in 2021 at a price which is the greater of (i) the then-current market value or (ii) the residual book value of the land including the buildings and installations thereon. The total obligation recorded for this lease as of December 31, 2018 and 2017 was $5.0 million and $5.7 million, respectively. Depreciation expense related to this capital lease was $0.3 million for each of the years ending December 31, 2018, 2017 and 2016. The depreciation expense related to this capital lease was recorded in “Cost of sales” onour consolidated statements of operations. Accumulated depreciation as of December 31, 2018 and 2017 was $3.5 million and $3.3 million, respectively.

We also incurred an immaterial amount of interest expense on this capital lease for the years ended December 31, 2018, 2017 and 2016, respectively. The interest expense related to this capital lease was recorded in “Interest expense, net” on our consolidated statements of operations.

Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans

Pension and Other Postretirement Benefits

As of December 31, 2018, we had two qualified noncontributory defined benefit pension plans: 1) the Union Plan and 2) the Merged Plan. All qualified noncontributory defined benefit pension plans have been frozen and have ceased accruing benefits.

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The Company also maintains the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2004 and the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2005 (collectively, the Nonqualified Plans). The Nonqualified Plans serve to restore certain retirement benefits that might otherwise be lost due to limitations imposed by federal law on qualified pension plans, as well as to provide supplemental retirement benefits, for certain senior executives of the Company. In addition, we sponsor multiple fully insured or self-funded medical plans and life insurance plans for certain retirees. The measurement date for all plans is December 31^st for each respective plan year.

We are required, as an employer, to: (a) recognize in our consolidated statements of financial position an asset for a plan’s overfunded status or a liability for a plan’s underfunded status; (b) measure a plan’s assets and our obligations that determine our funded status as of the end of the year; and (c) recognize changes in the funded status of a defined benefit postretirement plan in the year in which the changes occur and report these changes in accumulated other comprehensive loss. In addition, actuarial gains and losses that are not immediately recognized as net periodic pension cost are recognized as a component of accumulated other comprehensive loss and amortized into net periodic pension cost in future periods.

Pension Plan Merger and Proposed Termination

The Company currently intends to terminate the Merged Plan and has requested a determination letter from the IRS. The termination of the Merged Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Merged Plan and we expect the settlement process to be completed in 2019. The Company lacked sufficient information as of December 31, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Union Plan.

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
Change in benefit obligation:	2018			2017			2018			2017
Benefit obligation at beginning of year	$	185,760		$	177,696		$	2,037		$	2,504
Service cost	—			—			73			80
Interest cost	6,758			7,356			62			71
Actuarial (gain) loss	(10,805		)	9,601			(5		)	460
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Plan amendment	—			—			—			(545		)
Benefit obligation at end of year	$	172,608		$	185,760		$	1,803		$	2,037

Change in plan assets:	2018			2017			2018			2017
Fair value of plan assets at the beginning of the year	$	180,056		$	171,778		$	—		$	—
Actual return on plan assets	(4,299		)	16,799			—			—
Employer contributions	25,000			372			364			533
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Fair value of plan assets at the end of the year	191,652			180,056			—			—
Funding status	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

Amounts included in the consolidated statements of financial position consist of:

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018			2017
Noncurrent assets	$	19,273		$	3,021		$	—		$	—
Current liabilities	(4		)	(5		)	(334		)	(352		)
Noncurrent liabilities	(225		)	(8,720		)	(1,469		)	(1,685		)
Net amount recognized at end of year	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

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(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018		2017
Net actuarial (loss) gain	$	(59,972	)	$	(59,645	)	$	68	$	63
Prior service benefit	—			—			1,220		2,821
Net amount recognized at end of year	$	(59,972	)	$	(59,645	)	$	1,288	$	2,884

The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with an accumulated benefit obligation in excess of plan assets were $0.2 million, $0.2 million and $0.0 million, respectively, as of December 31, 2018 and $155.8 million, $155.8 million and $147.1 million, respectively, as of December 31, 2017.

The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were $172.4 million, $172.4 million and $191.7 million, respectively, as of December 31, 2018. For 2017, the projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were $30.0 million, $30.0 million and $33.0 million, respectively.

Components of Net Periodic (Benefit) Cost

(Dollars in thousands)	Pension Benefits									Retirement Health and Life Insurance Benefits
	2018			2017			2016			2018			2017			2016
Service cost	$	—		$	—		—			$	73		$	80		$	133
Interest cost	6,758			7,356			7,530			62			71			75
Expected return of plan assets	(8,662		)	(9,221		)	(10,808		)	—			—			—
Amortization of prior service cost (credit)	—			—			—			(1,602		)	(1,602		)	(1,489		)
Amortization of net loss	1,828			1,755			1,784			—			—			(47		)
Settlement charge	—			—			—			—			—			—
Net periodic benefit cost (benefit)	$	(76	)	$	(110	)	$	(1,494	)	$	(1,467	)	$	(1,451	)	$	(1,328	)

The estimated net loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $1.8 million. The estimated net benefit for the defined benefit postretirement plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $1.0 million.

Weighted-average assumptions used to determine benefit obligations at December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	4.25	%	3.70	%	3.75	%	3.25	%

Weighted-average assumptions used to determine net benefit cost for the years ended December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	3.70	%	4.25	%	3.25	%	3.25	%
Expected long-term rate of return on plan assets	4.94	%	5.51	%	—	%	—	%

Rate of compensation increase - An expected rate of compensation increase was not included in the weighted average assumptions as there would be no impact to the net benefit cost, as the plans have been previously frozen.

Discount rate - To determine the discount rate, we review current market indices of high quality corporate bonds, particularly the PruCurve index, to ensure that the rate used in our calculations is consistent and within an acceptable range based on these indices, which reflect current market conditions. The market-based rates are modified to be Rogers-specific, which is done by applying our pension benefit cash flow projections to the generic index rate.

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Long-term rate of return on assets - To determine the expected long-term rate of return on plan assets, we review historical and projected portfolio performance, the historical long-term rate of return, and we consider how any change in the allocation of the assets could affect the anticipated returns. Adjustments are made to the projected rate of return if it is deemed necessary based on those factors and other current market trends.

Health care cost trend rates - For measurement purposes as of December 31, 2018, we assumed an annual health care cost trend rates of 7.00% and 7.00% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. The rates were assumed to decrease gradually by 0.25% annually until reaching 4.50% and 4.50%, respectively, and remain at those levels thereafter. For measurement purposes as of December 31, 2017, we assumed annual health care cost trend rates of 7.25% and 7.25% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one-percentage point change in assumed health care cost trend rates would have been expected to have the following effects as of December 31, 2018:

(Dollars in thousands)	Increase		Decrease
Effect on total service and interest cost	$	8	$	(8	)
Effect on other postretirement benefit obligations	$	65	(60		)

Pension Plan Assets

Our defined benefit pension assets are invested with the objective of achieving a total rate of return over the long-term that is sufficient to fund future pension obligations. In managing these assets and our investment strategy, we take into consideration future cash contributions to the plans, as well as the potential of the portfolio underperforming the market, which is partially mitigated by maintaining a diversified portfolio of assets.

In order to meet our investment objectives, we set asset allocation target ranges based on current funding status and future projections in order to mitigate the risk in the plan while maintaining its funded status. In November 2014, we implemented a pension risk reduction strategy related to our investments, which included a change in our asset mix to hold a larger amount of fixed income securities. As of December 31, 2018, we held approximately 1% equity securities and 99% fixed income and short-term cash securities in our portfolio, compared to December 31, 2017 when we held approximately 4% equity securities and 96% fixed income securities.

In determining our investment strategy and calculating the net benefit cost, we utilized an expected long-term rate of return on plan assets. This rate is developed based on several factors, including the plans’ asset allocation targets, the historical and projected performance on those asset classes, and the plans’ current asset composition. To justify our assumptions, we analyze certain data points related to portfolio performance. For example, we analyze the actual historical performance of our total plan assets, which has generated a return of approximately 7.05% over the past 20 year period. Based on the historical returns and the projected future returns, we determined that a target return of 4.69% is appropriate for the current portfolio. Investments were stated at fair value as of the dates reported.

Securities traded on a national securities exchange are valued at the last reported sales price on the last business day of the plan year. The fair value of the guaranteed deposit account was determined through discounting expected future investment cash flow from both investment income and repayment of principal for each investment purchased.

The estimated fair values of the participation units owned by the plan in pooled separate accounts were based on quoted redemption values and adjusted for management fees and asset charges, as determined by the recordkeeper, on the last business day of the relevant plan year. Pooled separate accounts are accounts established solely for the purpose of investing the assets of one or more plans. Funds in a separate account are not commingled with other Company assets for investment purposes.

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The following table presents the fair value of the pension plan net assets by asset category and level, within the fair value hierarchy, as of December 31, 2018 and 2017.

	Assets at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	1,216	$	—	$	1,216
Fixed income bonds	—		186,385		—		186,385
Mutual funds	2,691		—		—		2,691
Guaranteed deposit account	—		—		1,360		1,360
Total assets at fair value	$	2,691	$	187,601	$	1,360	$	191,652

	Assets at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	4,610	$	—	$	4,610
Fixed income bonds	—		162,934		—		162,934
Mutual funds	6,223		—		—		6,223
Guaranteed deposit account	—		—		6,289		6,289
Total assets at fair value	$	6,223	$	167,544	$	6,289	$	180,056

The table below sets forth a summary of changes in the fair value of the guaranteed deposit account’s Level 3 assetsfor the year ended December 31, 2018:

(Dollars in thousands)	Guaranteed Deposit Account
Balance at beginning of year	$	6,289
Change in unrealized gain (loss)	(194		)
Purchases, sales, issuances and settlements (net)	(4,735		)
Balance at end of year	$	1,360

Cash Flows

Contributions

We made a voluntary contribution of $25.0 million to the Merged Plan during the third quarter of 2018 as part of the proposed plan termination process. We made required contributions of $0.4 million to our qualified defined benefit pension plans in 2017. As there is no funding requirement for the Nonqualified Plans or the Retiree Health and Life Insurance benefit plans, we fund the amount of benefit payments made during the year.

Estimated Future Payments

The following pension benefit payments are expected to be paid through the utilization of plan assets for the funded plans and from the Company’s operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from the Company’s operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2018.

(Dollars in thousands)	Pension Benefits		Retiree Health and Life Insurance Benefits
2019	$	9,500	$	334
2020	$	9,597	$	265
2021	$	9,818	$	171
2022	$	10,038	$	134
2023	$	10,228	$	151
2024-2028	$	53,901	$	825

Employee Savings and Investment Plans

We sponsor the Rogers Employee Savings and Investment Plan (RESIP), a 401(k) plan for domestic employees. Employees can defer an amount they choose, up to the annual IRS limit of $18,500. Certain eligible participants are also allowed to contribute

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the maximum catch-up contribution per IRS regulations. Our matching contribution is 6% of an eligible employee’s annual pre-tax contribution at a rate of 100% for the first 1% and 50% for the next 5% for a total match of 3.5%. Unless otherwise indicated by the participant, the matching dollars are invested in the same funds as the participant’s contributions. RESIP related expense amounted to $5.6 million in 2018, $4.0 million in 2017 and $3.0 million in 2016, which related solely to our matching contributions.

We acquired Griswold in July 2018 and eligible Griswold employees were included in the Griswold LLC 401K Plan. As of January 2019, eligible Griswold employees are being included in the RESIP. Compensation expense related to the additional Griswold employees was de minimis in 2018. We acquired DSP in January 2017 and DeWAL in November 2016. Eligible DSP and DeWAL employees were included in the RESIP as of the third quarter of 2017 and the first quarter of 2018, respectively. Compensation expense related to the additional DSP and DeWAL employees was de minimis in 2017. DeWAL employees were initially included under the DeWAL Industries, Inc. 401k Profit Sharing Plan (DeWAL Plan) from the acquisition date through the end of 2017. The DeWAL Plan matching contribution was 100% of the first 3% of employee pre-tax contributions.

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Note 13 – Commitments and Contingencies

Leases

Our principal non-cancelable operating lease obligations are for building space and vehicles. The leases generally provide that we pay maintenance costs. The lease periods typically range from one to five years and include purchase or renewal provisions. We have leases that are cancelable with minimal notice. Additionally, we have capital leases for our manufacturing facility in Eschenbach, Germany as well as office related equipment in various worldwide locations.

The following table includes future minimum lease payments under capital leases together with the present value of the net future minimum lease payments as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	543
2020	525
2021	4,276
2022	—
2023	—
Thereafter	—
Total	5,344
Less: Interest	(295		)
Present Value of Net Future Minimum Lease Payments	$	5,049

The following table includes future minimum lease payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	3,951
2020	3,052
2021	2,216
2022	1,507
2023	491
Thereafter	—
Total	$	11,217

The following table includes lease expense for each of the three years ended December 31, 2018:

	For the Year Ended December 31,
(Dollars in thousands)	2018		2017		2016
Operating Leases	$	3,850	$	3,819	$	3,567
Capital Leases	$	472	$	608	$	564

Environmental & Legal

We are currently engaged in the following environmental and legal proceedings:

Voluntary Corrective Action Program

Our location in Rogers, Connecticut is part of the Connecticut Voluntary Corrective Action Program (VCAP). As part of this program, we partnered with the Connecticut Department of Energy and Environmental Protection (CT DEEP) to determine the corrective actions to be taken at the site related to contamination issues. We evaluated this matter and completed internal due diligence work related to the site in the fourth quarter of 2015. Remediation activities on the site are ongoing and are recorded as reductions to the accrual as they are incurred. We have incurred aggregate remediation costs of $0.7 million through December 31, 2018, and the accrual for future remediation efforts is $1.7 million.

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Asbestos

Overview

We, like many other industrial companies, have been named as a defendant in a number of lawsuits filed in courts across the country by persons alleging personal injury from exposure to products containing asbestos. We have never mined, milled, manufactured or marketed asbestos; rather, we made and provided to industrial users a limited number of products that contained encapsulated asbestos, but we stopped manufacturing these products in the late 1980s. Most of the claims filed against us involve numerous defendants, sometimes as many as several hundred.

The following table summarizes the change in number of asbestos claims outstanding during 2018 and 2017:

	2018		2017
Claims outstanding at beginning of year	687		605
New claims filed	275		362
Pending claims concluded*	(217	)	(280	)
Claims outstanding at end of year	745		687

* For the year ended December 31, 2018, 192 claims were dismissed and 25 claims were settled. For the year ended December 31, 2017, 258 claims were dismissed and 22 claims were settled.Settlements totaled approximately $7.1 million for the year ended December 31, 2018, compared to $5.0 million for the year ended December 31, 2017.

Impacts on Financial Statements

We recognize a liability for asbestos-related contingencies that are probable of occurrence and reasonably estimable. In connection with the recognition of liabilities for asbestos-related matters, we record asbestos-related insurance receivables that are deemed probable.

The liability projection period covers all current and future claims through 2058, which represents the expected end of our asbestos liability exposure with no further ongoing claims expected beyond that date. This conclusion was based on our history and experience with the claims data, the diminished volatility and consistency of observable claims data, the period of time that has elapsed since we stopped manufacturing products that contained encapsulated asbestos and an expected downward trend in claims due to the average age of our claimants, which is approaching the average life expectancy.

To date, the defense and settlement costs of our asbestos-related product liability litigation have been substantially covered by insurance. We have identified continuous coverage for primary, excess and umbrella insurance from the 1950s through the mid-1980s, except for a period in the early 1960s, with respect to which we have entered into an agreement for primary, but not excess or umbrella, coverage. In addition, we have entered into a cost sharing agreement with most of our primary, excess and umbrella insurance carriers to facilitate the ongoing administration and payment of claims by the carriers. The cost sharing agreement may be terminated by any party, but will continue until a party elects to terminate it. As of the filing date for this report, the agreement has not been terminated, and no carrier had informed us it intended to terminate the agreement. During 2018, we received notices that primary coverage for a period of eight years and excess coverage for a period of three years had been exhausted. In 2018, we incurred indemnity and defense costs of $1.2 million for the year ended December 31, 2018, primarily related to the periods referenced above. We expect to exhaust individual primary, excess and umbrella coverages over time, and there is no assurance that such exhaustion will not accelerate due to additional claims, damages and settlements or that coverage will be available as expected.

The amounts recorded for the asbestos-related liability and the related insurance receivables are based on facts known at the time and a number of assumptions. However, projecting future events, such as the number of new claims to be filed each year, the average cost of disposing of such claims, the length of time it takes to dispose of such claims, coverage issues among insurers and the continuing solvency of various insurance companies, as well as the numerous uncertainties surrounding asbestos litigation in the United States, could cause the actual liability and insurance recoveries for us to be higher or lower than those projected or recorded.

Changes recorded in the estimated liability and estimated insurance recovery based on the projections of asbestos litigation and corresponding insurance coverage, result in the recognition of expense or income. For the years ended December 31, 2018, 2017 and 2016, we recognized expense of $0.7 million, $3.4 million and $0.3 million, respectively. The increase in expense recognized in 2017 compared to 2016 was primarily attributable to the change in the forecast period from 10 years to 40 years.

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For the years ended December 31, 2018 and 2017, our projected asbestos-related claims and insurance receivables were as follows:

(Dollars in millions)	2018		2017
Asbestos-related claims	$	70.3	$	76.2
Asbestos-related insurance receivables	$	63.8	$	69.2

General

In addition to the above issues, the nature and scope of our business brings us in regular contact with the general public and a variety of businesses and government agencies. Such activities inherently subject us to the possibility of litigation, including environmental and product liability matters that are defended and handled in the ordinary course of business. We have established accruals for matters for which management considers a loss to be probable and reasonably estimable. It is the opinion of management that facts known at the present time do not indicate that such litigation will have a material adverse impact on our results of operations, financial position or cash flows.

Note 14 – Income Taxes

The “Income before income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	2018		2017		2016
Domestic	$	14,381	$	39,751	$	10,888
International	96,208		93,174		71,392
Total	$	110,589	$	132,925	$	82,280

The “Income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	Current			Deferred			Total
2018
Domestic	$	(341	)	$	(3,007	)	$	(3,348	)
International	26,604			(318		)	26,286
Total	$	26,263		$	(3,325	)	$	22,938
2017
Domestic	$	7,535		$	21,936		$	29,471
International	27,418			(4,423		)	22,995
Total	$	34,953		$	17,513		$	52,466
2016
Domestic	$	2,078		$	3,376		$	5,454
International	24,537			4,006			28,543
Total	$	26,615		$	7,382		$	33,997

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Deferred tax assets and liabilities as of December 31, 2018 and 2017, were comprised of the following:

(Dollars in thousands)	2018			2017
Deferred tax assets
Accrued employee benefits and compensation	$	4,269		$	8,410
Tax loss and credit carryforwards	18,604			7,905
Reserves and accruals	4,935			4,699
Other	1,953			2,977
Total deferred tax assets	29,761			23,991
Less deferred tax asset valuation allowance	(16,889		)	(8,754		)
Total deferred tax assets, net of valuation allowance	12,872			15,237
Deferred tax liabilities
Depreciation and amortization	8,335			14,300
Postretirement benefit obligations	3,234			2,311
Unremitted earnings	1,778			3,100
Other	2,094			224
Total deferred tax liabilities	15,441			19,935
Net deferred tax asset (liability)	$	(2,569	)	$	(4,698	)

As of December 31, 2018, the Company had state net operating loss carryforwards ranging from $3.7 million to $6.1 million in various state taxing jurisdictions, which expire between 2021 and 2038 and approximately $8.4 million of credit carryforwards in Arizona, which will expire between 2019 and 2033. The Company also had $8.3 million of federal research and development credit carryforwards that begin to expire in 2026. We believe that it is more likely than not that the benefit from certain of the state net operating loss, state credits and federal research and development credits carryforwards will not be realized. In recognition of this risk, we have provided a valuation allowance of $16.9 million relating to these carryforwards.

We currently have approximately $3.7 million of foreign tax credits that begin to expire in 2027 and $0.5 million of minimum tax credits that can be utilized or refunded by tax year 2021.

We had a valuation allowance of $16.9 million as of December 31, 2018 and $8.8 million as of December 31, 2017, against certain of our deferred tax assets, primarily carryforwards expected to expire unused and deferred tax assets that are capital in nature. No valuation allowance has been provided on our other deferred tax assets, as we believe it is more likely than not that all such assets will be realized in the applicable jurisdictions. We reached this conclusion after considering the availability of taxable income in prior carryback years, tax planning strategies, and the likelihood of future taxable income exclusive of reversing temporary differences and carryforwards in the respective jurisdictions or entities. Differences between forecasted and actual future operating results or changes in carryforward periods could adversely impact the amount of deferred tax asset considered realizable.

Income tax expense differs from the amount computed by applying the United States federal statutory income tax rate to income before income taxes. The reasons for this difference were as follows:

(Dollars in thousands)	2018			2017			2016
Tax expense at Federal statutory income tax rate	$	23,224		$	46,529		$	28,798
International tax rate differential	826			(9,603		)	(2,260		)
Foreign source income, net of tax credits (excluding U.S. Tax Reform)	(197		)	1,087			1,215
State tax, net of federal	121			279			(200		)
Unrecognized tax benefits	(869		)	2,874			(5,555		)
U.S. Tax Reform	209			13,683			—
Equity compensation excess tax deductions	(2,238		)	(3,867		)	—
General business credits	(2,172		)	(1,080		)	(1,125		)
Distribution related foreign taxes	1,916			2,173			12,433
Valuation allowance change (excluding U.S. Tax Reform)	602			1,393			171
Other	1,516			(1,002		)	520
Income tax expense (benefit)	$	22,938		$	52,466		$	33,997

Our effective income tax rate for 2018 was 20.7% compared to 39.5% for 2017. The 2018 rate decrease was primarily due to a lower U.S. statutory tax rate in 2018 and the absence of the one-time impact from the enactment of the Tax Cuts and Jobs Act of

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2017 (U.S. Tax Reform) in 2017, an increase in reversal of reserves associated with uncertain tax positions and lower foreign tax impact on remitted and unremitted foreign earnings and profits.

The Company did not make any changes in 2018 to its position on the permanent reinvestment of its earnings from foreign operations. With the exception of certain Chinese subsidiaries, the Company continues to assert that historical foreign earnings are indefinitely reinvested. As of December 31, 2018 and 2017, the Company had recorded a deferred tax liability of $1.8 million and $3.1 million, respectively, for Chinese withholding tax on undistributed earnings that are not indefinitely reinvested. The other remaining foreign subsidiaries have both the intent and ability to indefinitely reinvest their undistributed earnings and the Company does not expect that these undistributed earnings should give rise to significant additional tax liabilities as a result of distribution of such earnings.

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and development credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities.

Unrecognized tax benefits, excluding potential interest and penalties, for the years ended December 31, 2018 and December 31, 2017, were as follows:

(Dollars in thousands)	2018			2017
Beginning balance	$	14,565		$	5,883
Gross increases - current period tax positions	2,583			7,056
Gross increases - tax positions in prior periods	505			3,243
Gross decreases - tax positions in prior periods	—			(375		)
Foreign currency exchange	(142		)	467
Lapse of statute of limitations	(7,710		)	(1,709		)
Ending balance	$	9,801		$	14,565

Included in the balance of unrecognized tax benefits as of December 31, 2018 were $9.6 million of tax benefits that, if recognized, would impact the effective tax rate. Also included in the balance of unrecognized tax benefit as of December 31, 2018 were $0.2 million of tax benefits that, if recognized, would result in adjustments to other tax accounts, primarily deferred taxes.

We recognize interest accrued related to unrecognized tax benefit as income tax expense. Related to the unrecognized tax benefits noted above, at December 31, 2018 and 2017, we had accrued potential interest and penalties of approximately $0.5 million and $0.6 million, respectively. We have recorded a net income tax benefit of $0.1 million during 2018, net income tax expense of $0.2 million during 2017 and $0.9 million net income tax benefit during 2016. It is possible that up to $1.8 million of our currently unrecognized tax benefits could be recognized within 12 months as a result of projected resolutions of worldwide tax disputes or the expiration of the statute of limitations.

We are subject to taxation in the United States and various state and foreign jurisdictions. Our tax years from 2014 through 2018 are subject to examination by the tax authorities. With few exceptions, we are no longer subject to United States federal, state, local and foreign examinations by tax authorities for the years before 2014.

Note 15 – Operating Segment and Geographic Information

Our reporting structure is comprised of the following strategic operating segments: ACS, EMS and PES. The remaining operations, which represent our non-core businesses, are reported in the Other operating segment. We believe this structure aligns our external reporting presentation with how we currently manage and view our business internally.

On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers. For additional information regarding the impacts of adoption of new accounting guidance for revenue recognition, refer to “Note 16 – Revenue from Contracts with Customers.” We sell products to fabricators and distributors who then sell directly into various end markets. End markets within our ACS operating segment include wireless infrastructure, aerospace and defense, automotive, connected devices, wired infrastructure and consumer electronics. End markets within our EMS operating segment include portable electronics, mass transit,

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automotive and consumer. End markets within our PES operating segment include e-mobility, industrial, renewable energy, mass transit and micro channel coolers. End markets in our Other operating segment include automotive and industrial.

The following table presents a disaggregation of revenue from contracts with customers and other pertinent financial information, for the periods indicated; inter-segment sales have been eliminated from the net sales data:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
2018
Net sales - recognized over time	$	—	$	5,788	$	221,896	$	16,973	$	244,657
Net sales - recognized at a point in time	$	294,154	$	335,576	$	1,442	$	3,262	$	634,434
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
Operating income	$	33,827	$	52,502	$	19,648	$	6,734	$	112,711
Total assets	$	396,075	$	588,841	$	273,212	$	21,216	$	1,279,344
Capital expenditures	$	61,425	$	10,917	$	18,051	$	156	$	90,549
Depreciation & amortization	$	20,121	$	18,501	$	10,640	$	811	$	50,073
Investment in unconsolidated joint ventures	$	—	$	18,667	$	—	$	—	$	18,667
Equity income in unconsolidated joint ventures	$	—	$	5,501	$	—	$	—	$	5,501
2017
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
Operating income	$	55,410	$	50,908	$	15,668	$	7,153	$	129,139
Total assets	$	353,786	$	489,456	$	261,034	$	20,858	$	1,125,134
Capital expenditures	$	9,900	$	7,563	$	9,238	$	514	$	27,215
Depreciation & amortization	$	16,351	$	16,270	$	10,572	$	906	$	44,099
Investment in unconsolidated joint ventures	$	—	$	18,324	$	—	$	—	$	18,324
Equity income in unconsolidated joint ventures	$	—	$	4,898	$	—	$	—	$	4,898
2016
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314
Operating income	$	42,455	$	25,884	$	5,229	$	7,329	$	80,897
Total assets	$	361,746	$	421,011	$	247,187	$	26,556	$	1,056,500
Capital expenditures	$	7,569	$	4,051	$	6,009	$	507	$	18,136
Depreciation & amortization	$	15,654	$	10,141	$	11,208	$	844	$	37,847
Investment in unconsolidated joint ventures	$	—	$	16,183	$	—	$	—	$	16,183
Equity income in unconsolidated joint ventures	$	—	$	4,146	$	—	$	—	$	4,146

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The following table presents net sales by our operating segment operations by geographic area for the years indicated:

(Dollars in thousands)	Net Sales(1)
Region/Country	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
December 31, 2018
United States	$	52,661	$	152,284	$	37,325	$	4,527	$	246,797
Other Americas	3,104		14,453		931		773		19,261
Total Americas	55,765		166,737		38,256		5,300		266,058
China	136,315		101,036		39,781		4,959		282,091
Other APAC	63,318		40,788		28,414		2,892		135,412
Total APAC	199,633		141,824		68,195		7,851		417,503
Germany	18,165		9,907		62,359		584		91,015
Other EMEA	20,591		22,896		54,528		6,500		104,515
Total EMEA	38,756		32,803		116,887		7,084		195,530
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
December 31, 2017
United States	$	48,277	$	141,508	$	30,403	$	5,210	$	225,398
Other Americas	2,946		9,709		1,153		699		14,507
Total Americas	51,223		151,217		31,556		5,909		239,905
China	143,065		93,039		32,164		5,123		273,391
Other APAC	64,077		36,233		21,845		3,421		125,576
Total APAC	207,142		129,272		54,009		8,544		398,967
Germany	23,925		9,211		54,813		657		88,606
Other EMEA	18,802		22,961		44,576		7,226		93,565
Total EMEA	42,727		32,172		99,389		7,883		182,171
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
December 31, 2016
United States	$	46,951	$	61,188	$	25,599	$	5,499	$	139,237
Other Americas	2,035		7,722		313		855		10,925
Total Americas	48,986		68,910		25,912		6,354		150,162
China	137,695		77,033		20,964		5,511		241,203
Other APAC	53,082		29,109		17,751		3,898		103,840
Total APAC	190,777		106,142		38,715		9,409		345,043
Germany	19,842		7,621		53,426		849		81,738
Other EMEA	18,182		20,508		34,314		6,367		79,371
Total EMEA	38,024		28,129		87,740		7,216		161,109
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314

⁽¹⁾ Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated.

Information relating to our long-lived assets by geographic area was as follows as of December 31 for the year indicated:

	Long-Lived Assets(1)
(Dollars in thousands)	2018		2017		2016
United States	$	476,560	$	370,964	$	326,199
China	58,205		57,404		62,728
Germany	113,412		114,497		101,725
Other	36,475		34,131		32,242
Total	$	684,652	$	576,996	$	522,894

⁽¹⁾ Long-lived assets are based on the location of the asset and are comprised of goodwill, other intangible assets and property, plant and equipment. Countries with 10% of more of long-lived assets have been disclosed.

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Note 16 – Revenue from Contracts with Customers

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, to achieve a consistent application of revenue recognition, resulting in a single revenue model to be applied by reporting companies under U.S. generally accepted accounting principles. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. In addition, the new standard requires that reporting companies disclose the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

The Company manufactures some products to customer specifications which are customized to such a degree that it is unlikely that another entity would purchase these products or that we could modify these products for another customer. These products are deemed to have no alternative use to the Company whereby we have an enforceable right to payment evidenced by contractual termination clauses. In accordance with ASC 606, for those circumstances we recognize revenue on an over-time basis. Revenue recognition does not occur until the product meets the definition of “no alternative use” and therefore, items that have not yet reached that point in the production process are not included in the population of items with over-time revenue recognition.

As appropriate, we record estimated reductions to revenue for customer returns, allowances, and warranty claims. Provisions for such reductions are made at the time of sale and are typically derived from historical trends and other relevant information.

Performance Obligations

Manufactured goods are our primary performance obligations. Revenue related to our performance obligations is predominantly recognized at a point in time consistent with our shipping terms. For certain products that meet the criteria of no alternative use whereby the Company has the right to payment, we recognize revenue on an over-time basis.

The selection of a method to measure progress toward completion of a contract requires judgment and is based on the nature of the products or services to be provided. We use the cost incurred method to measure the progress of our contracts with no alternative use products whereby the Company has the right to payment as we believe it is the best depiction of the transferring of value to the customer. Under the cost incurred method, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the contract. Contract costs include labor, materials and subcontractors costs, as well as an allocation of indirect costs. Net sales, including estimated fees or profits, are recorded as costs are incurred.

Performance obligations are typically satisfied within three months of receipt of a customer order; therefore, a change in cost estimates will not have a material impact on the percentage of completion noted at the prior quarter end. Our typical payment terms with customers range from 30 days to 105 days. Product pricing is determined and negotiated on a standalone basis. Product pricing is determined without consideration for the pricing, margin, or other information specific to other products that the same customer or other parties related to that customer may also purchase, whether in the same or a different contract. Management allocates the transaction price to its performance obligations primarily based on stand-alone selling prices that may have been developed via specific customer quote for no alternative use products and non-standard products or standard price lists for standard products. The accounting for the estimate of variable consideration is consistent with our current practice.

Contract modifications occur when there is a change to the products, price, or both. Contract modifications are treated as a separate contract if there are additions to promised goods and services that are distinct and if the price for that separate performance obligation reflects the stand-alone selling price for those goods or services. However, if the obligations in the contract modification are not distinct and are part of a single performance obligation that is only partially satisfied, the contract is not determined to be a separate contract and is accounted for as a revision to an existing contract. These modifications are accounted for prospectively when remaining promises are distinct from those previously transferred, or through a cumulative catch-up adjustment.

Contract Balances

The Company has contract assets primarily related to unbilled revenue for revenue recognized related to products that are deemed to have no alternative use whereby we have the right to payment. Revenue is recognized in advance of billing to the customer in these circumstances as billing is typically performed at the time of shipment to the customer. The unbilled revenue is included in the contract assets on the consolidated statements of financial position.

The Company did not have any contract liabilities as of December 31, 2018.

The following table presents contract assets by operating segment as of December 31, 2018:

	December 31, 2018
(Dollars in thousands)	Advanced Connectivity Solutions	Elastomeric Material Solutions	Power Electronics Solutions	Other	Total
Contract Assets	—	943	19,738	2,047	22,728

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No impairment losses were recognized during the year ended December 31, 2018 on any receivables or contract assets arising from our contracts with customers.

Transition

We adopted ASU 2014-09 in the first quarter of 2018 retrospectively with the cumulative effect of applying the standard recognized at the date of implementation and without restatement of comparative periods. This application of the new standard resulted in an increase to the January 1, 2018 balance of retained earnings of approximately $4.2 million, net of tax.

The guidance was applied to all contracts that were not completed at the date of implementation. The primary reason for the impact of adoption is due to over-time revenue recognition.

If the criteria for over-time recognition are not met, revenue is recognized at a point in time. In considering at what point in time control of the product or service has transferred to the customer, we consider qualitative factors such as: 1) present right to payment; 2) legal title to the asset; 3) physical possession; 4) risks and rewards of ownership; and, 5) customer acceptance.

The impact of adoption using the modified retrospective method on the Company’s consolidated financial statements is as follows:

	As of
Consolidated Statements of Financial Position:	December 31, 2017					January 1, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	18,099		$	18,099
Inventories	112,557		(12,307		)	100,250
Deferred income taxes	10,706		1,580			12,286
Retained earnings	684,540		4,212			688,752

The following tables set forth the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606, as compared to the guidance that was in effect before its adoption. The impact of adoption on the consolidated financial statements as of and for the year ended December 31, 2018 is as follows:

Consolidated Statements of Operations:	Year Ended
	December 31, 2018				December 31, 2018
(Dollars in thousands, except per share amounts)	Under ASC 605		Impact of Adoption		Under ASC 606
Net sales	$	874,462	$	4,629	$	879,091
Cost of sales	565,160		3,148		568,308
Income tax expense	22,558		380		22,938
Net income	86,550		1,101		87,651
Basic earnings per share	$	4.71	$	0.06	$	4.77
Diluted earnings per share	$	4.64	$	0.06	$	4.70

	As of
Consolidated Statements of Financial Position:	December 31, 2018					December 31, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	22,728		$	22,728
Inventories	148,092		(15,455		)	132,637
Deferred income taxes	8,846		1,960			10,806
Retained earnings	771,090		5,313			776,403

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	Year Ended
Consolidated Statements of Cash Flows:	December 31, 2018						December 31, 2018
(Dollars in thousands)	Under ASC 605			Impact of Adoption			Under ASC 606
Cash provided by operating activities:
Net income	$	86,550		$	1,101		$	87,651
Deferred income taxes	(3,705		)	380			(3,325		)
Contract assets	—			(22,728		)	(22,728		)
Inventories	(34,468		)	15,455			(19,013		)
Other, net	(4,801		)	5,792			991
Net cash provided by operating activities	66,820			—			66,820

Practical Expedients

The Company recognizes the incremental costs of obtaining a contract as an expense when incurred as the amortization period of the asset is expected to be one year or less. The Company does not adjust the promised amount of consideration for the effects of a significant financing component as we expect, at contract inception, that the period between when the transfer of goods to our customer occurs and when the customer fully pays for the goods will be one year or less. We do not disclose the Company’s unsatisfied performance obligations as they are part of contracts that have an original expected duration of one year or less.

Note 17 – Restructuring and Impairment Charges

Restructuring Charges

Global Headquarters Relocation

In 2017, we completed the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona. We recorded $0.6 million, $2.8 million and $0.7 million of expense for the years ended December 31, 2018, 2017 and 2016, respectively, related to the headquarters relocation, including $0.1 million, $0.4 million and $0.6 million of severance benefits expense for the years ended December 31, 2018, 2017 and 2016, respectively. The fair value of the total severance benefits to be paid (including payments already made) in connection with the headquarter relocation was $1.1 million. The total severance costs were expensed ratably over the required service period for the affected employees.

The following table presents severance activity related to the headquarters relocation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Headquarters Relocation
Balance as of December 31, 2017	$	183
Provisions	186
Payments	(264		)
Balance as of December 31, 2018	$	105

Facility Consolidation

On April 24, 2018, we made the decision to consolidate our Santa Fe Springs, California operations into the Company’s facilities in Carol Stream, Illinois and Bear, Delaware. We recorded $2.0 million of expense for the year ended December 31, 2018 related to the facility consolidation, including $0.5 million of severance benefits expense for the year ended December 31, 2018. The fair value of the total severance benefits to be paid (including payments already made) in connection with the facility consolidation is $0.5 million. The total severance costs are being expensed ratably over the required service period for the affected employees. Additionally, we incurred $1.6 million in capital expenditures for the year ended December 31, 2018 related to the facility consolidation.

The following table presents severance activity related to the facility consolidation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Facility Consolidation
Balance as of December 31, 2017	$	—
Provisions	546
Payments	(23		)
Balance as of December 31, 2018	$	523

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Impairment Charges

In 2018, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition, which was allocated specifically to the ACS operating segment. In 2017, we recognized a $0.3 million charge related to the impairment of our remaining investment in BrightVolt, Inc. As this investment did not relate to a specific operating segment, we allocated it ratably among ACS, EMS and PES. Also in 2017, we recognized a $0.5 million impairment charge related to the remaining net book value of an other intangible asset within the ROLINX^® product line in our PES operating segment.

Allocation of Charges to Operating Segments

The following table summarizes the restructuring and impairment charges recorded in our operating results in 2018, 2017 and 2016:

(Dollars in thousands)	2018		2017		2016
Advanced Connectivity Solutions
Severance and other related costs	$	244	$	1,305	$	375
Allocated impairment charges	1,506		161		—
Elastomeric Material Solutions
Severance and other related costs	2,152		834		176
Allocated impairment charges	—		103		—
Power Electronics Solutions
Severance and other related costs	136		621		183
Allocated impairment charges	—		543		—
Total Restructuring and Impairment Charges	$	4,038	$	3,567	$	734

Note 18 – Supplemental Financial Information

The components of Other operating (income) expense, net are as follows:

	Year Ended December 31,
(Dollars in thousands)	2018			2017			2016
Gain from antitrust litigation settlement	$	(4,231	)	$	—		$	—
Gain on sale of property, plant and equipment	(164		)	(5,329		)	—
Lease income	(948		)	—			—
Depreciation on leased assets	3,512			—			—
Indemnity claim settlement from acquisitions	(700		)	—			—
Economic incentive grants	(556		)	—			—
	$	(3,087	)	$	(5,329	)	$	—

In 2018, we recorded a gain from the settlement of antitrust litigation in the amount of $4.2 million as a result of the settlement of a class action lawsuit, filed in 2005, which alleged that Dow Chemical Company and other urethane raw material suppliers unlawfully agreed to fix, raise, maintain or stabilize the prices of Polyether Polyol Products sold in the United States from January 1, 1999 through December 31, 2004 in violation of the federal antitrust laws. We also recorded a gain of $0.7 million for the settlement of indemnity claims related to the DSP acquisition, income of $0.6 million from economic incentive grants related to the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona and a gain on sale of property, plant and equipment of $0.2 million.

In 2018, we recognized lease income of approximately $0.9 million and related depreciation expense on leased assets of approximately $3.5 million in connection with the transitional leaseback of a portion of the facility and certain machinery and equipment acquired from Isola in August 2018.

In 2017, we recognized other operating income of $5.3 million as a result of the sales of a facility and a parcel of land located in Belgium.

Note 19 – Recent Accounting Standards

Recently Issued Standards

In October 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes, which permits the use of the OIS rate based on the SOFR as a U.S. benchmark interest rate for hedge accounting purposes. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The amendments in this update will be adopted on a prospective basis and the Company does not expect this guidance to have a significant impact on our results of operations or statements of cash flows.

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In August 2018, the FASB issued Accounting Standards Update ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud computing Arrangement that is a Service Contract,which aligns the requirements for capitalizing costs incurred in the implementation of a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year, with early adoption permitted. The amendments in this update may be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit plans or other postretirement plans. This ASU is effective for our fiscal year ending December 31, 2020, with early adoption permitted. ASU 2018-14 is required to be applied on a retrospective basis to all periods presented. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This ASU expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year. Early adoption is permitted. ASU 2018-13 is generally required to be applied retrospectively to all periods presented upon their effective date with the exception of certain amendments, which should be applied prospectively to the most recent interim or annual period presented in the year of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows for reclassification of stranded tax effects resulting from U.S. Tax Reform from accumulated other comprehensive loss to retained earnings but it does not require this reclassification. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this ASU in the first quarter of 2019 and will not elect to reclassify the stranded tax effects resulting from U.S. Tax Reform. As a result of that election, the adoption of ASU 2018-02 will not have an impact on the Company’s consolidated financial statements and disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to classify leases as either finance or operating leases and record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. An accounting policy election may be made to account for leases with a term of 12 months or less similar to existing guidance for operating leases today. ASU No. 2016-02 supersedes the existing guidance on accounting for leases. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which allows for an optional transition method for the adoption of Topic 842. The two permitted transition methods are now the modified retrospective approach, which applies the new lease requirements at the beginning of the earliest period presented, and the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02 is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this standard in the first quarter of 2019 using the optional transition method. The Company also intends to elect the practical expedients that allows us to carry forward the historical lease classification. The Company has established an inventory of existing leases and implemented a new process of evaluating the classification of each lease. The financial impact of the adoption of the new standard is estimated to increase total assets and total liabilities by approximately $9.0 million to $11.0 million, as of January 1, 2019.  The financial impact of the adoption primarily relates to the capitalization of right-of-use assets related to operating leases. The Company has implemented changes to its processes and internal controls, as necessary, to meet the reporting and disclosure requirements of the new standard.

Recently Adopted Standards Reflected in Our 2018 Financial Statements

In March 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740):Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. This ASU adds guidance that answers questions regarding how certain income tax effects from the U.S. Tax Reform should be applied to companies’ financial statements. The guidance also lists which financial statement disclosures are required under a measurement period approach.

In January 2018, the FASB released guidance on the accounting for tax on the Global Intangible Low Tax Income (GILTI) provisions of U.S. Tax Reform. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that accounting for deferred taxes related to GILTI inclusions or treating any taxes

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on GILTI inclusions as period costs are both acceptable methods subject to an accounting policy election. This guidance was effective for our first quarter of 2018 and the Company elected to treat any potential GILTI inclusions as a period cost.

In December 2017, SAB 118 was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of U.S. Tax Reform. In accordance with SAB 118, the company recorded provisional estimates for the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and tax expense associated with the mandatory deemed repatriation of foreign earnings at December 31, 2017. The Company completed the analysis of the impact of U.S. Tax Reform during 2018 and recorded an additional tax expense of $0.2 million for the year ended December 31, 2018.

In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The Company adopted this standard on January 1, 2018, which did not have a material effect on the consolidated financial statements. Adoption of this standard was applied prospectively to awards modified on or after the adoption date.

In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. The changes to the standard require employers to report the service cost component in the same line item as other compensation costs arising from services rendered by employees during the reporting period. The other components of net periodic pension benefit costs are now being presented in the statement of operations separately from the service cost and outside of a subtotal of operating income from operations. In addition, only the service cost component may be eligible for capitalization, where applicable. The Company adopted this standard on January 1, 2018. In conjunction with the adoption of this guidance, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from“Selling, general and administrative expenses” to “Other income (expense), net” for the years endedDecember 31, 2017and2016.

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Note 20 – Quarterly Results of Operations (Unaudited)

	2018
(Dollars in thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	214,611	$	214,675	$	226,863	$	222,942
Gross margin	$	76,606	$	76,672	$	79,130	$	78,375
Net income	$	26,136	$	17,329	$	19,734	$	24,452
Net income per share:
Basic	$	1.43	$	0.94	$	1.07	$	1.33
Diluted	$	1.40	$	0.93	$	1.06	$	1.31

(Dollars in thousands, except per share amounts)	2017
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	203,828	$	201,424	$	206,783	$	209,008
Gross margin	$	80,350	$	80,546	$	82,188	$	75,491
Net income	$	27,032	$	20,896	$	25,532	$	6,999
Net income per share:
Basic	$	1.50	$	1.15	$	1.40	$	0.38
Diluted	$	1.47	$	1.13	$	1.37	$	0.37

Note 21 – Share Repurchases

In 2015, we initiated a share repurchase program (the Program) of up to $100.0 million of the Company’s capital stock. We initiated the Program to mitigate potentially dilutive effects of stock options and shares of restricted stock granted by the Company, in addition to enhancing shareholder value. The share repurchase program has no expiration date, and may be suspended or discontinued at any time without notice. As of December 31, 2018, $49.0 million remained of our $100.0 million share repurchase program.

We repurchased the following shares of capital stock through the Program, using cash from operations and cash on hand, during the years presented below:

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017
Shares of capital stock repurchased	23,138		—
Value of capital stock repurchased	$	2,999	$	—

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SCHEDULE II

Valuation and Qualifying Accounts

(Dollars in thousands)	Balance at Beginning of Period		Charged to (Reduction of) Costs and Expenses			Taken Against Allowance			Other (Deductions) Recoveries		Balance at End of Period
Allowance for Doubtful Accounts
December 31, 2018	$	1,525	$	189		$	(360	)	$	—	$	1,354
December 31, 2017	$	1,952	$	(275	)	$	(152	)	$	—	$	1,525
December 31, 2016	$	695	$	1,321		$	(64	)	$	—	$	1,952

(Dollars in thousands)	Balance at Beginning of Period		Charged to (Reduction of) Costs and Expenses		Taken Against Allowance		Other (Deductions) Recoveries		Balance at End of Period
Valuation on Allowance for Deferred Tax Assets
December 31, 2018	$	8,754	$	8,135	$	—	$	—	$	16,889
December 31, 2017	$	6,388	$	2,366	$	—	$	—	$	8,754
December 31, 2016	$	6,202	$	186	$	—	$	—	$	6,388

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

EVALUATION OF DISCLOSURE CONTROLS AND PROCEDURES

The Company, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d- 15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as of December 31, 2018. The Company’s disclosure controls and procedures are designed (i) to ensure that information required to be disclosed by it in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and (ii) to ensure that information required to be disclosed in the reports the Company files or submits under the Exchange Act is accumulated and communicated to its management, including its Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Based on their evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures were effective as of December 31, 2018.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

There were no changes in the Company’s internal control over financial reporting during the fourth quarter of the fiscal year ended December 31, 2018 that have materially affected or are reasonably likely to materially affect its internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act. This evaluation excluded the operations of Griswold LLC (Griswold), which we acquired on July 6, 2018. As part of the ongoing integration activities, we will complete an assessment of Griswold’s existing controls and incorporate our controls and procedures into the acquired operations, as appropriate.

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

The management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Exchange Act Rules 13a-15(f) and 15d-15(f). The Company’s internal control over financial reporting was designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Company’s financial statements for external purposes in accordance with accounting principles generally accepted in the United States. Our internal control over financial reporting includes those policies and procedures that:

• pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets;

• provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with accounting principles generally accepted in the United States, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and

• provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2018. In making its assessment of internal control over financial reporting, management used the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013). Based on the results of this assessment, management, including our Chief Executive Officer and our Chief Financial Officer, has concluded that, as of December 31, 2018, our internal control over financial reporting was effective.

The Company’s independent registered public accounting firm, PricewaterhouseCoopers, LLP, has audited the effectiveness of the Company’s internal control over financial reporting as of December 31, 2018.

On July 6, 2018, the Company acquired 100% of the membership interests in Griswold. As a result, management has excluded Griswold from its assessment of internal control over financial reporting. The Griswold assets are held in a wholly-owned subsidiary whose total assets and total net sales represent 1.3% and 1.6%, respectively, of the Company’s total assets and net sales as of and for the year ended December 31, 2018.

Item 9B. Other Information

None.

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Part III

Item 10. Directors, Executive Officers and Corporate Governance

We are incorporating by reference the information with respect to the Directors, Executive Officers and Corporate Governance set forth under the captions “Nominees for Director, Director Qualifications and Experience”, “Section 16(a) Beneficial Ownership Reporting Compliance” and “Board of Directors - Meetings of the Board and Committees” in our Definitive Proxy Statement for our 2019 Annual Meeting of Shareholders, which we intend to file within 120 days after the end of our fiscal year pursuant to Section 14(a) of the Exchange Act. Information with respect to our executive officers is presented in Part I, Item 1 of this report and is hereby incorporated into this Item 10 by reference.

Code of Ethics

We have adopted a code of business conduct and ethics policy, which applies to all employees, officers and directors of Rogers Corporation. The Rogers Corporation Code of Business Conduct and Ethics Policy is posted on our website at http://www.rogerscorp.com. We intend to satisfy the disclosure requirements regarding any amendment to, or waiver of, a provision of the Code of Business Conduct and Ethics Policy for our principal executive officer, principal financial officer or principal accounting officer (or others performing similar functions) by posting such information on our website. Our website is not incorporated into or a part of this Form 10-K.

Item 11. Executive Compensation

We are incorporating by reference the information with respect to Executive Compensation set forth under the captions “Board of Directors - Directors’ Compensation”, “Board of Directors - Meetings of the Board and Committees”, “Compensation Discussion and Analysis”, “Compensation and Organization Committee Report” and “2018 Compensation” in our Definitive Proxy Statement for our 2019 Annual Meeting of Shareholders, which we intend to file within 120 days after the end of our fiscal year pursuant to Section 14(a) of the Exchange Act.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

We are incorporating by reference the information with respect to Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters set forth under the captions “Stock Ownership of Management and Directors” and “Beneficial Ownership of More Than Five Percent of Rogers Stock” in our Definitive Proxy Statement for our 2019 Annual Meeting of Shareholders, which we intend to file within 120 days after the end of our fiscal year pursuant to Section 14(a) of the Exchange Act.

Item 13. Certain Relationships and Related Transactions, and Director Independence

We are incorporating by reference the information with respect to Certain Relationships and Related Transactions and Director Independence as set forth under the captions “Related Party Transactions” and “Board of Directors-Director Independence” in our Definitive Proxy Statement for our 2019 Annual Meeting of Shareholders, which we intend to file within 120 days after the end of our fiscal year pursuant to Section 14(a) of the Exchange Act.

Item 14. Principal Accountant Fees and Services

We are incorporating by reference the information with respect to Accountant Fees and Services set forth under the caption “Fees of Independent Registered Public Accounting Firm” in our Definitive Proxy Statement for our 2019 Annual Meeting of Shareholders, which we intend to file within 120 days after the end of our fiscal year pursuant to Section 14(a) of the Exchange Act.

Part IV

Item 15. Exhibits, Financial Statement Schedules

(1) Financial Statements and Schedules.

The following consolidated financial statements of the Company are included in Item 8 of this Form 10-K:

Report of Independent Registered Public Accounting Firm

Consolidated Statements of Operations

Consolidated Statements of Comprehensive Income

Consolidated Statements of Financial Position

Consolidated Statements of Shareholders’ Equity

Consolidated Statements of Cash Flows

83

Notes to Consolidated Financial Statements

(2) Financial Statement Schedules.

Schedule II - Valuation and Qualifying Accounts

Other than as set forth above, schedules are omitted because they are not applicable, or are not required, or because the information is included in the consolidated financial statements and notes thereto.

(3) Exhibits.

The following list of exhibits includes exhibits submitted with this Form 10-K as filed with the SEC and those incorporated by reference to other filings.

3.1 Restated Articles of Organization of Rogers Corporation, as amended, incorporated by reference to Exhibit 3a to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2006 (the 2006 Form 10-K) (File No. 001-04347).

3.2 Amended and Restated Bylaws of Rogers Corporation, effective February 11, 2016, incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on February 26, 2016.

10.1 The Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Non-Management Directors, incorporated by reference to Exhibit 10i to the Registrant’s Quarterly Report on Form 10-Q filed November 8, 2007 (File No. 001-04347).**

10.1.1 First Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Non-Management Directors, incorporated by reference to Exhibit 10.5 to the Registrant’s Quarterly Report on Form 10-Q filed November 3, 2009 (File No. 001-04347).**

10.1.2 Second Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Non-Management Directors, incorporated by reference to Exhibit 10.5 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010 (the 2010 Form 10-K) (File No. 001-04347).**

10.2 The Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Key Employees, incorporated by reference to Exhibit 10j to the Registrant’s Quarterly Report on Form 10-Q filed November 8, 2007 (File No. 001-04347).**

10.2.1 First Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Key Employees, incorporated by reference to Exhibit 10j to the Registrant’s Quarterly Report on Form 10-Q filed August 7, 2008 (File No. 001-04347).**

10.2.2 Second Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Key Employees, incorporated by reference to Exhibit 10.6 to the Registrant’s Quarterly Report on Form 10-Q filed November 3, 2009 (File No. 001-04347).**

10.2.3 Third Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Key Employees, incorporated by reference to Exhibit 10.4 to the Registrant’s Current Report on Form 8-K filed February 17, 2010 (File No. 001-04347).**

10.2.4 Fourth Amendment to the Amended and Restated Rogers Corporation Voluntary Deferred Compensation Plan for Key Employees, incorporated by reference to Exhibit 10.6 to the 2010 Form 10-K (File No. 001-04347).**

10.3 Rogers Corporation Amended and Restated Pension Restoration Plan, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed December 17, 2008 (File No. 001-04347).**

10.3.1 First Amendment to Rogers Corporation Amended and Restated Pension Restoration Plan, incorporated by reference to Exhibit 10.4 to the Registrant’s Quarterly Report on Form 10-Q filed November 3, 2009 (File No. 001-04347).**

10.3.2 Second Amendment to Rogers Corporation Amended and Restated Pension Restoration Plan, incorporated by reference to Exhibit 10.10 to the 2010 Form 10-K (File No. 001-04347).**

10.4 Form of Indemnification Agreement between the Registrant and each of its executive officers, incorporated by reference to Exhibit 99.2 to the Registrant’s Current Report on Form 8-K on December 14, 2004 (File No. 001-04347).**

10.5 Form of Indemnification Agreement between the Registrant and each of its directors, incorporated by reference to Exhibit 99.1 to the Registrant’s Current Report on Form 8-K on December 14, 2004 (File No. 001-04347).**

10.6 Rogers Corporation 2009 Long-Term Equity Compensation Plan, as amended, incorporated by reference to Exhibit B to the Registrant’s Definitive Proxy Statement filed on March 24, 2014.**

84

10.7 Form of Performance-Based Restricted Stock Award Agreement under the 2009 Plan, incorporated by reference to Exhibit 10.14 to the Registrant’s 2015 Form 10-K.**

10.8 Form of Time-Based Restricted Stock Unit Award Agreement under the 2009 Plan, incorporated by reference to Exhibit 10.16 to the Registrant’s 2015 Form 10-K.**

10.9 Letter Agreement between the Registrant and Bruce D. Hoechner, dated September 15, 2011 and accepted on September 20, 2011, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed September 26, 2011 (File No. 001-04347).**

10.10 Letter Agreement between the Company and Michael M. Ludwig, dated August 28, 2018, incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on Form 10-Q filed November 2, 2018.

10.11 Rogers Corporation Deferred Compensation Plan, incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed June 26, 2014.**

10.12 Form of Officer Special Severance Agreement between the Company and each of its executive officers, incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q filed July 30, 2015.**

10.13 Third Amended and Restated Credit Agreement, dated as of February 17, 2017 among Rogers Corporation, the lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent, HSBC Bank USA, National Association and Citizens Bank, N.A. as co-syndication agents, and Citibank, N.A. as documentation agent, incorporated by reference to Exhibit 10.24 to the Registrant’s Form 10-K for the fiscal year ended December 31, 2016.

21 Subsidiaries of the Registrant, filed herewith.

23.1 Consent of PricewaterhouseCoopers, LLP, Independent Registered Public Accounting Firm, filed herewith.

31.1 Certification of President and Chief Executive Officer (Principal Executive Officer) Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.

31.2 Certification of Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer) Pursuant to Rule 13a-14(a) of the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.

32 Certification of President and Chief Executive Officer (Principal Executive Officer) and Senior Vice President, Chief Financial Officer and Treasurer (Principal Financial Officer) Pursuant to Rule 13a-14(b) of the Securities Exchange Act of 1934 and 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, filed herewith.

101 The following materials from Rogers Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2018, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Financial Position for the fiscal years ended December 31, 2018 and 2017; (ii) Consolidated Statements of Operations for the fiscal years ended December 31, 2018, 2017 and 2016; (iii) Consolidated Statements of Shareholders’ Equity for the fiscal years ended December 31, 2018, 2017 and 2016; and (iv) Consolidated Statements of Cash Flows for the fiscal years ended December 31, 2018, 2017 and 2016; and (v) Notes to Consolidated Financial Statements.

** Management contract or compensatory plan or arrangement.

Item 16. Form 10-K Summary

Not Applicable.

85

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ROGERS CORPORATION

(Registrant)

/s/ Bruce D. Hoechner

Bruce D. Hoechner

President and Chief Executive Officer

Principal Executive Officer

Dated: February 20, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below on February 20, 2019, by the following persons on behalf of the Registrant and in the capacities indicated.

/s/ Bruce D. Hoechner	/s/ Keith L. Barnes
Bruce D. Hoechner President and Chief Executive Officer Director Principal Executive Officer	Keith L. Barnes Director
/s/ Michael M. Ludwig	/s/ Carol R. Jensen
Michael M. Ludwig Senior Vice President, Chief Financial Officer and Treasurer Principal Financial Officer	Carol R. Jensen Director
/s/ Mark D. Weaver
Mark D. Weaver Chief Accounting Officer and Corporate Controller Principal Accounting Officer	Jeffrey J. Owens Director
/s/ Michael F. Barry	/s/ Ganesh Moorthy
Michael F. Barry Director	Ganesh Moorthy Director
/s/ Helene Simonet	/s/ Peter C. Wallace
Helene Simonet Director	Peter C. Wallace Director

86

EX-21

Exhibit 21

ROGERS CORPORATION AND CONSOLIDATED SUBSIDIARIES

Subsidiaries of the Registrant

Company	Percentage of Voting Securities Owned	Jurisdiction of Incorporation or Organization
Rogers Japan Inc.	100%	Delaware
Rogers Southeast Asia, Inc.	100%	Delaware
Rogers Taiwan, Inc.	100%	Delaware
Rogers Technologies Singapore, Inc.	100%	Delaware
Rogers Technologies (Suzhou) Co., Ltd.	100%	China
World Properties, Inc.	100%	Illinois
Rogers BVBA	100%	Belgium
Rogers GmbH	100%	Germany
Rogers U.K. Ltd.	100%	England
Rogers International Trading (Shanghai) Co. Ltd.	100%	China
Rogers KF, Inc.	100%	Delaware
Rogers Luxembourg Sarl	100%	Luxembourg
Rogers Benelux Sarl	100%	Luxembourg
Rogers Worldwide LLC	100%	Delaware
Rogers New Territories Corporation Limited	100%	Hong Kong
Rogers Asia Holding Company Limited	100%	Hong Kong
Rogers Pacific Limited	100%	Hong Kong
Utis Co., Ltd.	100%	Korea
Rogers Germany GmbH	100%	Germany
Rogers Korea, Inc.	100%	Korea
Arlon Holdings, LLC	100%	Delaware
Arlon LLC	100%	Delaware
Arlon MED International LLC	100%	Delaware
Rogers Material Technologies (Suzhou) Co., Ltd	100%	China
Arlon Materials for Electronics Co., Ltd	100%	China
Rogers Hungary KfT	100%	Hungary
Rogers Finance (Ireland) Unlimited Company	100%	Ireland
Rogers Finance (Luxembourg) Sarl	100%	Luxembourg
Chandler Holdings I Corporation	100%	Delaware
DeWAL Industries, Inc.	100%	Rhode Island
Diversified Silicone Products Corporation	100%	Delaware
Griswold LLC	100%	Delaware
Rogers Inoac Corporation *	50%	Japan
Rogers Inoac Suzhou Corporation *	50%	China

* These entities are unconsolidated joint ventures and accordingly are not included in the consolidated financial statements of Rogers Corporation, except to the extent required by the equity method of accounting.

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S‑8 (Nos. 333-198038, 333-181199, 333-174195, 333-159063, 333-124489, 333-59634, 333-50901, 333-42545, 333-14419 and 033-53353) of Rogers Corporation of our report dated February 20, 2019 relating to the financial statements, financial statement scheduleand the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Hartford, Connecticut

February 20, 2019

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Bruce D. Hoechner, certify that:

1. I have reviewed this Annual Report on Form 10-K of Rogers Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's fourth fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated: February 20, 2019

/s/ Bruce D. Hoechner

Bruce D. Hoechner

President and Chief Executive Officer
Principal Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Michael M. Ludwig, certify that:

1. I have reviewed this Annual Report on Form 10-K of Rogers Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's fourth fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated: February 20, 2019

/s/ Michael M. Ludwig

Michael M. Ludwig

Senior Vice President, Chief Financial Officer and Treasurer

Principal Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Rogers Corporation, a Massachusetts corporation (the “Corporation”), does hereby certify that:

The Annual Report on Form 10-K for the year ended December 31, 2018 (the “Form 10-K”) of the Corporation fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

/s/ Bruce D. Hoechner

Bruce D. Hoechner

President and Chief Executive Officer
Principal Executive Officer

February 20, 2019

/s/ Michael M. Ludwig

Michael M. Ludwig

Senior Vice President, Chief Financial Officer and Treasurer

Principal Financial Officer

February 20, 2019

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 15, 2019	Jun. 30, 2018
Document Documentand Entity Information [Abstract]
Entity Registrant Name	ROGERS CORP
Entity Trading Symbol	ROG
Entity Central Index Key	0000084748
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Voluntary Filer	No
Entity Current Reporting Status	Yes
Entity Well-known Season Filer	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		18,438,502
Entity Public Float			$ 2,026,896,605

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 879,091	$ 821,043	$ 656,314
Cost of sales	568,308	502,468	406,829
Gross margin	310,783	318,575	249,485
Selling, general and administrative expenses	164,046	161,651	139,272
Research and development expenses	33,075	29,547	28,582
Restructuring and impairment charges	4,038	3,567	734
Other operating (income) expense, net	(3,087)	(5,329)	0
Operating income	112,711	129,139	80,897
Equity income in unconsolidated joint ventures	5,501	4,898	4,146
Other income (expense), net	(994)	5,019	1,167
Interest expense, net	(6,629)	(6,131)	(3,930)
Income before income tax expense	110,589	132,925	82,280
Income tax expense	22,938	52,466	33,997
Net income	$ 87,651	$ 80,459	$ 48,283
Earnings per share:
Basic earnings per share (in dollars per share)	$ 4.77	$ 4.43	$ 2.68
Diluted earnings per share (in dollars per share)	$ 4.70	$ 4.34	$ 2.65
Shares used in computing:
Basic earnings per share (in shares)	18,374	18,154	17,991
Diluted earnings per share (in shares)	18,659	18,547	18,223

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 87,651	$ 80,459	$ 48,283
Other comprehensive income (loss) before reclassifications	(11,986)	28,457
Change in unrealized gain (loss) before reclassifications, net of tax
Unrealized (gain) loss reclassified into earnings, net of tax	(191)	32	11
Pension and other postretirement benefits:
Actuarial net gain (loss) incurred, net of tax (Note 4)	(1,678)	(1,481)
Amortization of gain, net of tax	(15)	131
Other comprehensive income (loss)	(13,679)	27,107	(3,804)
Comprehensive income	73,972	107,566	44,479
Foreign Currency Translation Adjustments
Other comprehensive income (loss) before reclassifications	(12,505)	28,463	(5,081)
Pension and other postretirement benefits:
Actuarial net gain (loss) incurred, net of tax (Note 4)	0	0
Amortization of gain, net of tax	0	0
Derivative Instruments Designated as Cash Flow Hedges
Other comprehensive income (loss) before reclassifications	519	(6)	0
Pension and other postretirement benefits:
Actuarial net gain (loss) incurred, net of tax (Note 4)	0	0
Amortization of gain, net of tax	(191)	32
Accumulated Other Comprehensive Income (Loss) Pension and Other Postretirement Benefits
Other comprehensive income (loss) before reclassifications	0	0
Pension and other postretirement benefits:
Actuarial net gain (loss) incurred, net of tax (Note 4)	(1,678)	(1,481)	1,106
Amortization of gain, net of tax	$ 176	$ 99	$ 160

XML

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 167,738	$ 181,159
Accounts receivable, less allowance for doubtful accounts of $1,354 and $1,525	144,623	140,562
Contract assets	22,728	0
Inventories	132,637	112,557
Prepaid income taxes	3,093	3,087
Asbestos-related insurance receivables, current portion	4,138	5,682
Assets held for sale	0	896
Other current assets	10,829	10,580
Total current assets	485,786	454,523
Property, plant and equipment, net of accumulated depreciation of $317,414 and $289,909	242,759	179,611
Investments in unconsolidated joint ventures	18,667	18,324
Deferred income taxes	8,236	6,008
Goodwill	264,885	237,107
Other intangible assets, net of amortization	177,008	160,278
Asbestos-related insurance receivables, non-current portion	59,685	63,511
Other long-term assets	22,318	5,772
Total assets	1,279,344	1,125,134
Current liabilities
Accounts payable	40,321	36,116
Accrued employee benefits and compensation	30,491	39,394
Accrued income taxes payable	7,032	6,408
Capital lease obligations, current portion	420	579
Asbestos-related liabilities, current portion	5,547	5,682
Other accrued liabilities	23,369	25,629
Total current liabilities	107,180	113,808
Borrowings under revolving credit facility	228,482	130,982
Capital lease obligations, non-current portion	4,629	5,873
Pension liability	270	8,720
Retiree health care and life insurance benefits	1,469	1,685
Asbestos-related liabilities, non-current portion	64,799	70,500
Non-current income tax	8,418	12,823
Deferred income taxes	10,806	10,706
Other long-term liabilities	4,967	3,464
Commitments and contingencies (Note 13)
Shareholders’ equity
Capital stock - $1 par value; 50,000 authorized shares; 18,395 and 18,255 shares issued and outstanding	18,395	18,255
Additional paid-in capital	132,360	128,933
Retained earnings	776,403	684,540
Accumulated other comprehensive loss	(78,834)	(65,155)
Total shareholders' equity	848,324	766,573
Total liabilities and shareholders' equity	$ 1,279,344	$ 1,125,134

XML

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, less allowance for doubtful accounts	$ 1,354	$ 1,525
Property, plant and equipment, net of accumulated depreciation	$ 317,414	$ 289,909
Capital Stock, par value (in dollars per share)	$ 1
Capital Stock, authorized shares	50,000
Capital Stock, shares issued	18,395
Capital Stock, shares outstanding	18,255

XML

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Capital Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2015	$ 584,582	$ 17,957	$ 112,017	$ 543,066	$ (88,458)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,283			48,283
Other comprehensive income (loss)	(3,804)				(3,804)
Shares issued for vested restricted stock units, net of cancellations for tax withholding	(1,377)	63	(1,440)
Stock options exercised	4,143	95	4,048
Shares issued for employee stock purchase plan	858	23	835
Shares issued to directors	0	24	(24)
Equity compensation expense	11,275		11,275
Tax adjustments on share-based compensation	(179)		(179)
Shares repurchased	(7,995)	(141)	(7,854)
Ending Balance at Dec. 31, 2016	635,786	18,021	118,678	591,349	(92,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80,459			80,459
Other comprehensive income (loss)	27,107				27,107
Shares issued for vested restricted stock units, net of cancellations for tax withholding	(5,309)	121	(5,430)
Stock options exercised	3,085	83	3,002
Shares issued for employee stock purchase plan	895	15	880
Shares issued to directors	0	15	(15)
Equity compensation expense	11,818		11,818
Cumulative-effect adjustment of change in accounting for share-based compensation	12,732			12,732
Shares repurchased	0		0
Ending Balance at Dec. 31, 2017	766,573	18,255	128,933	684,540	(65,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87,651			87,651
Other comprehensive income (loss)	(13,679)				(13,679)
Shares issued for vested restricted stock units, net of cancellations for tax withholding	(6,600)	117	(6,717)
Stock options exercised	861	22	839
Shares issued for employee stock purchase plan	1,082	12	1,070
Shares issued to directors	0	12	(12)
Equity compensation expense	11,223	0	11,223
Cumulative-effect adjustment of change in accounting for share-based compensation	4,212			4,212
Shares repurchased	(2,999)	(23)	(2,976)
Ending Balance at Dec. 31, 2018	$ 848,324	$ 18,395	$ 132,360	$ 776,403	$ (78,834)

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities:
Net income	$ 87,651	$ 80,459	$ 48,283
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	50,073	44,099	37,847
Equity compensation expense	11,223	11,818	11,275
Deferred income taxes	(3,325)	17,513	7,382
Equity in undistributed income of unconsolidated joint ventures	(5,501)	(4,898)	(4,146)
Dividends received from unconsolidated joint ventures	4,431	3,529	2,757
Pension and other postretirement benefits	(1,552)	(1,561)	(2,822)
Asbestos-related charges	704	3,400	313
(Gain) loss on sale or disposal of property, plant and equipment	(164)	(5,154)	225
Impairment charges	1,506	807	0
Provision (benefit) for doubtful accounts	236	(439)	1,321
Proceeds from insurance related to operations	0	932	0
Changes in assets and liabilities:
Accounts receivable	(3,824)	(14,059)	(13,005)
Contract assets	(22,728)	0	0
Inventories	(19,013)	(14,208)	9,689
Pension and postretirement benefit contributions	(25,354)	(906)	(842)
Other current assets	(648)	(576)	1,933
Accounts payable and other accrued expenses	(7,886)	12,341	21,472
Other, net	991	5,885	(4,715)
Net cash provided by operating activities	66,820	138,982	116,967
Investing Activities:
Acquisition of business, net of cash received	(77,969)	(60,191)	(133,943)
Isola asset acquisition	(43,434)	0	0
Capital expenditures	(47,115)	(27,215)	(18,136)
Proceeds from the sale of property, plant and equipment, net	1,081	8,095	0
Proceeds from insurance claims	0	1,041	275
Net cash used in investing activities	(167,437)	(78,270)	(151,804)
Financing Activities:
Proceeds from borrowings under revolving credit facility	102,500	0	166,000
Line of credit issuance costs	0	(1,169)	0
Repayment of debt principal and capital lease obligations	(6,162)	(110,689)	(103,760)
Payments of taxes related to net share settlement of equity awards	(6,600)	(5,309)	(1,377)
Proceeds from the exercise of stock options, net	861	895	858
Proceeds from issuance of shares to employee stock purchase plan	1,082	3,085	4,143
Share repurchases	(2,999)	0	(7,995)
Net cash provided by (used in) financing activities	88,682	(113,187)	57,869
Effect of exchange rate fluctuations on cash	(1,486)	5,867	149
Net increase (decrease) in cash and cash equivalents	(13,421)	(46,608)	23,181
Cash and cash equivalents at beginning of period	181,159	227,767	204,586
Cash and cash equivalents at end of period	167,738	181,159	227,767
Supplemental Disclosures:
Accrued capital additions	2,744	2,376	1,081
Assets obtained under leasing arrangements	0	883	0
Interest, net of amounts capitalized	7,040	5,787	3,924
Income taxes	$ 29,161	$ 36,918	$ 23,952

XML

Organization and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

Note 1 – Basis of Presentation, Organization and Summary of Significant Accounting Policies

As used herein, the terms “Company,” “Rogers,” “we,” “us,” “our” and similar terms mean Rogers Corporation and its subsidiaries, unless the context indicates otherwise.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and our wholly-owned subsidiaries, after elimination of inter-company accounts and transactions. The preparation of financial statements, in conformity with accounting principles generally accepted in the United States (U.S. GAAP), requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassification

On January 1, 2018, the Company adopted ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. Upon adoption, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from “Selling, general and administrative expenses” to “Other income (expense), net” for the years ended December 31, 2017 and 2016, respectively. Refer to “Note 19 – Recent Accounting Standards” for further information.

Organization

Our reporting structure is comprised of three strategic operating segments: Advanced Connectivity Solutions (ACS), Elastomeric Material Solutions (EMS) and Power Electronics Solutions (PES). The remaining operations are accumulated and reported as our Other operating segment.

Advanced Connectivity Solutions

Our ACS operating segment designs, develops, manufactures and sells circuit materials and solutions enabling high-performance and high-reliability connectivity for applications in wireless infrastructure (e.g., power amplifiers, antennas, small cells and distributed antenna systems), automotive (e.g., active safety, advanced driver assistance systems, telematics and thermal management), aerospace and defense, connected devices (e.g., mobile internet devices and Internet of Things), wired infrastructure (e.g., computing and IP infrastructure) and consumer electronics. We believe these products have characteristics that offer performance and other functional advantages in many market applications that serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits. Trade names for our ACS products include: RO3000^®, RO4000^®, RT/duroid^®, TMM^®, AD Series^TM and CLTE Series^TM. As of December 31, 2018, our ACS operating segment had manufacturing and administrative facilities in Chandler, Arizona; Rogers, Connecticut; Bear, Delaware; Evergem, Belgium; and Suzhou, China.

Elastomeric Material Solutions

Our EMS operating segment designs, develops, manufactures and sells engineered material solutions for a wide variety of applications and end markets. These include polyurethane and silicone materials used in critical cushioning, sealing and vibration management applications for portable electronics (e.g., smart phones), automotive, aerospace, rail, footwear and printing end markets; customized silicones used in flex heater and semiconductor thermal applications; polytetrafluoroethylene and ultra-high molecular weight polyethylene materials used in wire and cable, pressure-sensitive tapes and automotive applications. We believe these materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers’ products from other commonly available materials. EMS products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs). Trade names for our EMS products include: PORON^®, BISCO^®, DeWAL^®, ARLON^®, DSP^®, Griswold^®, eSORBA^®, XRD^®, HeatSORB™ and R/bak^®.

In July 2018, we acquired Griswold LLC (Griswold), a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions. In January 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), a custom silicone product development and manufacturing business, serving a wide range of high reliability applications, and in November 2016, we acquired DeWAL Industries LLC (DeWAL), a manufacturer of polytetrafluoroethylene and ultra-high molecular weight polyethylene films, pressure sensitive tapes and specialty products for the industrial, aerospace, automotive, and electronics markets. The acquisitions of Griswold, DSP and DeWAL, and their subsequent integration into our EMS operating segment, have enabled us to increase scale and complement our existing product offerings, thus enhancing our ability to support our customers.

As of December 31, 2018, our EMS operating segment had administrative and manufacturing facilities in Moosup, Connecticut; Rogers, Connecticut; Woodstock, Connecticut; Bear, Delaware; Carol Stream, Illinois; Narragansett, Rhode Island; Santa Fe Springs, California; Ansan, South Korea; and Suzhou, China. We also own 50% of: (1) Rogers Inoac Corporation (RIC), a joint venture established in Japan to design, develop, manufacture and sell PORON products predominantly for the Japanese market and (2) Rogers INOAC Suzhou Corporation (RIS), a joint venture established in China to design, develop, manufacture and sell PORON products primarily for RIC customers in various Asian countries. INOAC Corporation owns the remaining 50% of both RIC and RIS. RIC has manufacturing facilities at the INOAC facilities in Nagoya and Mie, Japan, and RIS has manufacturing facilities at Rogers’ facilities in Suzhou, China.

Power Electronics Solutions

Our PES operating segment designs, develops, manufactures and sells ceramic substrate materials for power module applications (e.g., variable frequency drives, vehicle electrification and renewable energy), laminated busbars for power inverter and high power interconnect applications (e.g., mass transit, hybrid-electric and electric vehicles, renewable energy and variable frequency drives) and micro-channel coolers (e.g., laser cutting equipment). We sell our ceramic substrate materials and micro channel coolers under the curamik^® trade name, and our busbars under the ROLINX^® trade name. As of December 31, 2018, our PES operating segment had manufacturing and administrative facilities in Evergem, Belgium; Eschenbach, Germany; Budapest, Hungary; and Suzhou, China.

Other

Our Other operating segment consists of elastomer components for applications in ground transportation, office equipment, consumer and other markets; elastomer floats for level sensing in fuel tanks, motors, and storage tanks; and inverters for portable communications and automotive markets. Trade names for our elastomer components include: NITROPHYL^® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR^® elastomer rollers.

Summary of Significant Accounting Policies

Cash Equivalents

Highly liquid investments with original maturities of three months or less are considered cash equivalents. These investments are stated at cost, which approximates fair value.

Investments in Unconsolidated Joint Ventures

We account for our investments in and advances to unconsolidated joint ventures, both of which are 50% owned, using the equity method of accounting.

Foreign Currency

All balance sheet accounts of foreign subsidiaries are translated or remeasured at exchange rates in effect at each year end, and income statement items are translated using the average exchange rates for the year. Translation adjustments for those entities that operate under a local currency are recorded directly to a separate component of shareholders’ equity, while remeasurement adjustments for those entities that operate under the parent’s functional currency are recorded to the income statement as a component of “Other income (expense), net.” Currency transaction gains and losses are reported as income or expense, respectively, in the consolidated statements of operations as a component of “Other income (expense), net.” Such adjustments resulted in losses of $0.7 million in 2018, gains of $0.9 million in 2017 and losses of $2.7 million in 2016.

Allowance for Doubtful Accounts

The allowance for doubtful accounts is determined based on a variety of factors that affect the potential collectability of the related receivables, including the length of time receivables are past due, customer credit ratings, financial stability of customers, specific one-time events and past customer history. In addition, in circumstances where we are made aware of a specific customer’s inability to meet its financial obligations, a specific allowance is established. The majority of accounts are individually evaluated on a regular basis and appropriate reserves are established as deemed appropriate based on the criteria previously mentioned. The remainder of the reserve is based on our estimates and takes into consideration historical trends, market conditions and the composition of our customer base.

Inventories

Inventories are stated at the lower of cost or net realizable value. The cost of inventories is determined using the first in, first out (FIFO) method. An allowance is made for estimated losses due to obsolescence. The allowance is determined for groups of products based on purchases in the recent past and/or expected future demand and market conditions. Abnormal amounts of idle facility expense and waste are not capitalized in inventory. The allocation of fixed production overheads to the inventory cost is based on the normal capacity of the production facilities.

Inventories consisted of the following:

	As of December 31,
(Dollars in thousands)	2018		2017
Raw materials	$	59,321	$	43,092
Work-in-process	30,086		28,133
Finished goods	43,230		41,332
Total inventories	$	132,637	$	112,557

Property, Plant and Equipment

Property, plant and equipment are stated on the basis of cost. For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

Software Costs

We capitalize certain computer software and software development costs incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, and (ii) compensation and related benefits for employees who are directly associated with the software project. Capitalized software costs are amortized on a straight-line basis when placed into service over the estimated useful lives of the software, which approximates three to five years. Net capitalized software and development costs were $1.7 million and $4.7 million for the years ended December 31, 2018 and 2017, respectively. Capitalized software is included within “Property, plant and equipment, net of accumulated depreciation” in the consolidated statements of financial position.

Goodwill and Other Intangible Assets

We have made acquisitions over the years that included the recognition of intangible assets. Intangible assets are classified into three categories: (1) goodwill; (2) other intangible assets with definite lives subject to amortization; and (3) other intangible assets with indefinite lives not subject to amortization. Other intangible assets can include items such as trademarks and trade names, licensed technology, customer relationships and covenants not to compete, among other things. Each definite-lived other intangible asset is amortized over its respective economic useful life using the economic attribution method.

Goodwill is tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that our goodwill is impaired, then we compare the estimated fair value of each of our reporting units to their respective carrying value. If a reporting unit’s carrying value is greater than its fair value, then an impairment is recognized for the excess and charged to operations. We currently have four reporting units with goodwill: ACS, EMS, curamik^® and Elastomer Components Division (ECD). Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018.

The application of the annual goodwill impairment test requires significant judgment, including the identification of reporting units, assignment of assets and liabilities to reporting units and determination of the fair value of each reporting unit. Determining the fair value is subjective and requires the use of significant estimates and assumptions, including financial projections for net sales, gross margin and operating margin, discount rates, terminal year growth rates and future market conditions, among others. We estimated the fair value of our reporting units using an income approach based on the present value of future cash flows through a five year discounted cash flow analysis. The discounted cash flow analysis utilized the discount rates for each of the reporting units ranging from 11.25% for EMS to 12.90% for ECD, and terminal year growth rates ranging from 4.9% for curamik^® to 5.9% for ACS. We believe this approach yields the most appropriate evidence of fair value as our reporting units are not easily compared to other corporations involved in similar businesses. We further believe that the assumptions and rates used in our annual goodwill impairment test are reasonable, but inherently uncertain. There were no impairment charges resulting from our goodwill impairment analysis for the year ended December 31, 2018. Our ACS, EMS, curamik^® and ECD reporting units had allocated goodwill of approximately $51.7 million, $142.6 million, $68.4 million and $2.2 million respectively, as of December 31, 2018.

Indefinite-lived other intangible assets are tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that an indefinite-lived other intangible asset is impaired, then we compare the estimated fair value of that indefinite-lived other intangible asset to its respective carrying value. If an indefinite-lived other intangible asset’s carrying value is greater than its fair value, then an impairment charge is recognized for the excess and charged to operations. Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018. The application of the annual indefinite-lived other intangible asset impairment test requires significant judgment, including the determination of fair value of each indefinite-lived other intangible asset. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our indefinite-lived other intangible assets impairment analysis for the year ended December 31, 2018. The curamik^® reporting unit had an indefinite-lived other intangible asset of approximately $4.5 million as of December 31, 2018.

Definite-lived other intangible assets are tested for recoverability whenever events or changes in circumstances indicate the carrying value may not be recoverable. The recoverability test involves comparing the estimated sum of the undiscounted cash flows for each definite-lived other intangible asset to its respective carrying value. If a definite-lived other intangible asset’s carrying value is greater than the sum of its undiscounted cash flows, then the definite-lived other intangible asset’s carrying value is compared to its estimated fair value and an impairment charge is recognized for the excess and charged to operations. The application of the recoverability test requires significant judgment, including the identification of the asset group and determination of undiscounted cash flows and fair value of the underlying definite-lived other intangible asset. Determination of undiscounted cash flows requires the use of significant estimates and assumptions, including certain financial projections. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our definite-lived other intangible assets impairment analysis for the year ended December 31, 2018. Our ACS, EMS and curamik^® reporting units had definite-lived other intangible assets of approximately $7.9 million, $152.2 million and $12.4 million, respectively, as of December 31, 2018.

Environmental and Product Liabilities

We accrue for our environmental investigation, remediation, operating and maintenance costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. For environmental matters, the most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. For sites with multiple potential responsible parties (PRPs), we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. When no amount within a range of estimates is more likely to occur than another, we accrue to the low end of the range and disclose the range. When future liabilities are determined to be reimbursable by insurance coverage, an accrual is recorded for the potential liability and a receivable is recorded for the estimated insurance reimbursement amount. We are exposed to the uncertain nature inherent in such remediation and the possibility that initial estimates will not reflect the final outcome of a matter.

We review our asbestos-related projections annually in the fourth quarter of each year unless facts and circumstances materially change during the year, at which time we would analyze these projections. We believe the assumptions made on the potential exposure and expected insurance coverage are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation. Our estimates of asbestos-related contingent liabilities and related insurance receivables are based on an independent actuarial analysis and an independent insurance usage analysis prepared annually by third parties. The actuarial analysis contains numerous assumptions, including number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, average settlement costs, average defense costs, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these assumptions are subject to even greater uncertainty as the projection period lengthens. The insurance usage analysis considers, among other things, applicable deductibles, retentions and policy limits, the solvency and historical payment experience of various insurance carriers, the likelihood of recovery as estimated by external legal counsel and existing insurance settlements.

We believe the assumptions used in our models for determining our potential exposure and related insurance coverage are reasonable at the present time, but such assumptions are inherently uncertain. Given the inherent uncertainty in making projections, we plan to re-examine periodically the assumptions used in the projections of current and future asbestos claims, and we will update them if needed based on our experience, changes in the assumptions underlying our models, and other relevant factors, such as changes in the tort system. There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we may incur additional charges for our asbestos liabilities and defense costs in the future, that could exceed existing reserves and insurance recovery. We plan to continue to vigorously defend ourselves and believe we have unutilized insurance coverage to mitigate future costs related to this matter.

Fair Value of Financial Instruments

Management believes that the carrying values of financial instruments, including cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities approximate fair value based on the maturities of these instruments. The fair value of our borrowings under credit facility are determined using discounted cash flows based upon our estimated current interest cost for similar type borrowings or current market value, which falls under Level 2 of the fair value hierarchy. Based on our credit characteristics as of December 31, 2018, borrowings would generally bear interest at LIBOR plus 150.0 basis points. As the current borrowings under our Third Amended Credit Agreement bear interest at adjusted 1-month LIBOR plus 150.0 basis points, we believe the carrying value of our borrowings approximates fair value. For additional information on the calculation of fair value measurements, refer to “Note 2 – Fair Value Measurements.”

Hedging Transactions and Derivative Financial Instruments

From time to time, we use derivative instruments to manage commodity, interest rate and foreign currency exposures. Derivative instruments are viewed as risk management tools and are not used for trading or speculative purposes. To qualify for hedge accounting treatment, derivatives used for hedging purposes must be designated and deemed effective as a hedge of the identified underlying risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.

Derivatives used to hedge forecasted cash flows associated with interest rates, foreign currency commitments, or forecasted commodity purchases are accounted for as cash flow hedges. For those derivative instruments that qualify for hedge accounting treatment, if the hedge is highly effective, all changes in the fair value of the derivative hedging instrument are recorded in other comprehensive income (loss). The derivative hedging instrument will be reclassified to earnings when the hedged item impacts earnings. For those derivative instruments that do not qualify for hedge accounting treatment, any related gains and losses are recognized in the consolidated statements of operations as a component of “Other income (expense), net.” For additional information, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

Concentration of Credit and Investment Risk

We extend credit on an uncollateralized basis to almost all customers. Concentration of credit and geographic risk with respect to accounts receivable is limited due to the large number and general dispersion of accounts that constitute our customer base. We routinely perform credit evaluations on our customers. As of December 31, 2018 and 2017, there were no customers that individually accounted for more than 10% of total accounts receivable. We have purchased credit insurance coverage for certain accounts receivable. We did not experience significant credit losses on customers’ accounts in 2018, 2017 or 2016.

We are subject to credit and market risk by using derivative instruments. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value of the derivative instrument. We seek to minimize counterparty credit (or repayment) risk by entering into derivative transactions with major financial institutions with investment grade credit ratings.

We invest excess cash principally in investment grade government securities and time deposits. We have established guidelines relative to diversification and maturities in order to maintain safety and liquidity. These guidelines are periodically reviewed and modified to reflect changes in market conditions.

Income Taxes

We are subject to income taxes in the United States and in numerous foreign jurisdictions. The Company accounts for income taxes following Accounting Standards Codification (ASC) 740, Income Taxes, recognizing deferred tax assets and liabilities using enacted tax rates for the effect of temporary differences between book and tax basis of recorded assets and liabilities. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some or all of a deferred tax asset will not be realized.

As a result of the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform), all post-1986 undistributed foreign subsidiary earnings and profits as of December 31, 2018 have been subjected to U.S. tax through the transition tax. Our unremitted foreign earnings could be subject to additional income taxes if they are redeployed outside of their country of origin. The Company did not make any changes in 2018 to its position on the permanent reinvestment of its historical earnings from foreign operations. With the exception of certain Chinese subsidiaries, the Company continues to assert that historical foreign earnings are indefinitely reinvested. As of December 31, 2018 and 2017, the Company had recorded a deferred tax liability of $1.8 million and $3.1 million, respectively, for Chinese withholding tax on undistributed earnings that are not indefinitely reinvested. The other remaining foreign subsidiaries have both the intent and ability to indefinitely reinvest their undistributed earnings and the Company does not expect that these undistributed earnings should give rise to significant additional tax liabilities as a result of such earnings. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes.”

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we have completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and development credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities.

U.S. Tax Reform includes two new U.S. tax base erosion provisions, the Global Intangible Low-Taxed Income (GILTI) provisions and the Base Erosion and Anti-Abuse Tax (BEAT) provisions. The GILTI provisions require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary's tangible assets. The Company has elected to account for GILTI tax in the period in which it is incurred, and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the year ended December 31, 2018. The BEAT provisions eliminate the deduction of certain base-erosion payments made to related foreign corporations, and impose a minimum tax if greater than regular tax. Starting January 1, 2018, the Company has accounted for BEAT in the period in which it is incurred to the extent the Company is subject to it. We have determined that our base erosion payments do not exceed the threshold for applicability for the year ended December 31, 2018 and we do not currently anticipate any significant long-term impact from the BEAT on our effective tax rate in future periods.

We record benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain position is recognized. If the threshold is met, we recognize the largest amount of the tax benefit that is greater than fifty percent likely to be realized upon ultimate settlement.

We recognize interest and penalties within the “Income tax expense” line item in the consolidated statements of operations. Accrued interest and penalties are included within the related tax liability line item in the consolidated statements of financial position.

Revenue Recognition

Recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. We recognize revenue when all of the following criteria are met: (1) we have entered into a binding agreement, (2) the performance obligations have been identified, (3) the transaction price to the customer has been determined, (4) the transaction price has been allocated to the performance obligations in the contract, and (5) the performance obligations have been satisfied. The majority of our shipping terms permit us to recognize revenue at point of shipment. Some shipping terms require the goods to be through customs or be received by the customer before title passes. In those instances, revenue is not recognized until either the customer has received the goods or they have passed through customs, depending on the circumstances. Shipping and handling costs are treated as fulfillment costs. Sales tax or VAT are excluded from the measurement of the transaction price.

Pension and Other Postretirement Benefits

We provide various defined benefit pension plans for our U.S. employees and we sponsor multiple fully insured or self-funded medical plans and fully insured life insurance plans for retirees. In 2013, the defined benefit pension plans were frozen, so that future benefits no longer accrue. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rate of return on plan assets, mortality rates, and other factors. The assumptions used in these models are determined as follows: (i) the discount rate used is based on the PruCurve index; (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market results and our expectations of future returns, as well as current market assumptions related to long-term return rates; and (iii) the mortality rate is based on a mortality projection that estimates current longevity rates and their impact on the long-term plan obligations. We review these assumptions periodically throughout the year and update as necessary.

In October 2017, the Company merged two of its defined benefit pension plans: the Rogers Corporation Defined Benefit Pension Plan and the Hourly Employees Pension Plan of Arlon LLC, Microwave Material and Silicone Technologies Divisions, Bear, Delaware (collectively, the Merged Plan). The Company currently intends to terminate the Merged Plan and has requested a determination letter from the Internal Revenue Service (IRS). The termination of the Merged Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Merged Plan and we expect the settlement process to be completed in 2019. The Company lacks sufficient information as of December 31, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Rogers Corporation Employees’ Pension Plan (the Union Plan). For additional information, refer to “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans.”

Advertising Costs

Advertising costs are expensed as incurred and amounted to $3.8 million, $4.4 million and $3.0 million for 2018, 2017 and 2016, respectively.

Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding.

Equity Compensation

Equity compensation mainly consists of expense related to restricted stock units and deferred stock units.

Performance-based restricted stock unit compensation expense is based on achievement of both market and service conditions. The fair value of these awards is determined based on a Monte Carlo simulation valuation model on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards.

Time-based restricted stock units compensation expense is based on the achievement of only service conditions. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period.

Deferred stock units, which are granted to non-management directors, are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. The compensation related to these grants is expensed immediately on the date of grant.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 2 – Fair Value Measurements

The accounting guidance for fair value measurements establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value.

• Level 1 – Quoted prices in active markets for identical assets or liabilities.

• Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

• Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

From time to time we enter into various instruments that require fair value measurement, including foreign currency contracts, copper derivative contracts and interest rate swaps. Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:

	Derivative Instruments at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Foreign currency contracts	$	—	$	522	$	—	$	522
Copper derivative contracts	$	—	$	583	$	—	$	583
Interest rate swap	$	—	$	461	$	—	$	461

	Derivative Instruments at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2			Level 3		Total
Foreign currency contracts	$	—	$	(396	)	$	—	$	(396	)
Copper derivative contracts	$	—	$	2,016		$	—	$	2,016
Interest rate swap	$	—	$	41		$	—	$	41

For further discussion on our derivative contracts, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

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Hedging Transactions and Derivative Financial Instruments

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Hedging Transactions and Derivative Financial Instruments

Note 3 – Hedging Transactions and Derivative Financial Instruments

We are exposed to certain risks related to our ongoing business operations. The primary risks being managed through our use of derivative instruments are foreign currency exchange rate risk and commodity pricing risk (primarily related to copper). During 2017, we entered into an interest rate swap to hedge interest rate risk. We do not use derivative financial instruments for trading or speculative purposes. The valuation of derivative contracts used to manage each of these risks is described below:

• Foreign Currency - The fair value of any foreign currency option derivative is based upon valuation models applied to current market information such as strike price, spot rate, maturity date and volatility, and by reference to market values resulting from an over-the-counter market or obtaining market data for similar instruments with similar characteristics.

• Commodity - The fair value of copper derivatives is computed using a combination of intrinsic and time value valuation models, which are collectively a function of five primary variables: price of the underlying instrument, time to expiration, strike price, interest rate and volatility. The intrinsic valuation model reflects the difference between the strike price of the underlying copper derivative instrument and the current prevailing copper prices in an over-the-counter market at period end. The time value valuation model incorporates changes in the price of the underlying copper derivative instrument, the time value of money, the underlying copper derivative instrument’s strike price and the remaining time to the underlying copper derivative instrument’s expiration date from the period end date.

• Interest Rates- The fair value of interest rate swap instruments is derived by comparing the present value of the interest rate forward curve against the present value of the swap rate, relative to the notional amount of the swap. The net value represents the estimated amount we would receive or pay to terminate the agreements. Settlement amounts for an “in the money” swap would be adjusted down to compensate the counterparty for cost of funds, and the adjustment is directly related to the counterparties’ credit ratings.

The guidance for the accounting and disclosure of derivatives and hedging transactions requires companies to recognize all of their derivative instruments as either assets or liabilities at fair value in the statements of financial position. The accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies for hedge accounting treatment as defined under the applicable accounting guidance. For derivative instruments that are designated and qualify for hedge accounting treatment as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (loss). This gain or loss is reclassified into earnings in the same line item of the consolidated statements of operations associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. As of December 31, 2018 and 2017, only our interest rate swap qualified for hedge accounting treatment as a cash flow hedge, and the hedge was highly effective.

Foreign Currency

During 2018, we entered into Korean Won, Japanese Yen, Euro, Hungarian Forint and Chinese Renminbi forward contracts. We entered into these foreign currency forward contracts to mitigate certain global transactional exposures. These contracts do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in “Other income (expense), net” in our consolidated statements of operations in the period in which the adjustment occurred.

As of December 31, 2018 the notional values of these foreign currency forward contracts were as follows:

Notional Values of Foreign Currency Derivatives
KRW/USD	₩	1,325,760,000
JPY/EUR	¥	675,000,000
EUR/USD	€	10,449,335
USD/CNY	$	23,655,942

Commodity

As of December 31, 2018, we had 26 outstanding contracts to hedge exposure related to the purchase of copper in our PES and ACS operating segments. These contracts are held with financial institutions and are intended to offset rising copper prices and do not qualify for hedge accounting treatment. As a result, any fair value adjustments required on these contracts are recorded in“Other income (expense), net” in our consolidated statements of operations in the period in which the adjustment occurred.

As of December 31, 2018, the volume of our copper contracts outstanding were as follows:

Volume of Copper Derivatives
January 2019 - March 2019	189 metric tons per month
April 2019 - June 2019	188 metric tons per month
July 2019 - September 2019	191 metric tons per month
October 2019 - December 2019	195 metric tons per month
January 2020 - March 2020	202 metric tons per month

Interest Rates

In March 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. This transaction has been designated as a cash flow hedge and qualifies for hedge accounting treatment. For additional information regarding our revolving credit facility, refer to “Note 11 – Debt and Capital Leases.”

Effects on Financial Statements

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2018			Fair Values of Derivative Instruments as of December 31, 2018
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(333	)	$	522
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	(2,101	)	$	583
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	420		$	461

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2017			Fair Values of Derivative Instruments as of December 31, 2017
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(7	)	$	(396	)
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	1,928		$	2,016
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	41		$	41

⁽¹⁾ All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2018 interest rate swap balance, which was recorded in the “Other long-term assets” line item in the consolidated statements of financial position.

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Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 4 – Accumulated Other Comprehensive Loss

The changes in accumulated other comprehensive loss by component for the years ended December 31, 2018 and 2017 were as follows:

(Dollars and accompanying footnotes in thousands)	Foreign Currency Translation Adjustments			Pension and Other Postretirement Benefits(1)			Derivative Instrument Designated as Cash Flow Hedge(2)			Total
Balance as of December 31, 2016	$	(46,446	)	$	(45,816	)	$	—		$	(92,262	)
Other comprehensive income (loss) before reclassifications	28,463			—			(6		)	28,457
Actuarial net loss incurred in the fiscal year	—			(1,481		)	—			(1,481		)
Amounts reclassified from accumulated other comprehensive loss	—			99			32			131
Net current-period other comprehensive income (loss)	28,463			(1,382		)	26			27,107
Balance as of December 31, 2017	(17,983		)	(47,198		)	26			(65,155		)
Other comprehensive income (loss) before reclassifications	(12,505		)	—			519			(11,986		)
Actuarial net loss incurred in the fiscal year	—			(1,678		)	—			(1,678		)
Amounts reclassified from accumulated other comprehensive loss	—			176			(191		)	(15		)
Net current-period other comprehensive income (loss)	(12,505		)	(1,502		)	328			(13,679		)
Balance as of December 31, 2018	$	(30,488	)	$	(48,700	)	$	354		$	(78,834	)

⁽¹⁾ Net of taxes of $9,984, $9,563 and $9,160 for the years ended December 31, 2018, 2017 and 2016, respectively.

⁽²⁾ Net of taxes of $106, $15 and $0 for the years ended December 31, 2018, 2017 and 2016, respectively.

The impacts to the statements of operations related to reclassifications from accumulated other comprehensive loss for the years ended December 31, 2018 and 2017 were as follows:

(Dollars in thousands)	December 31, 2018			December 31, 2017			Financial Statement Line Item
Amortization of pension and other postretirement benefits
	$	(227	)	$	(154	)	Other income (expense), net(1)
	51			55			Income tax expense
	$	(176	)	$	(99	)	Net income
Unrealized gains (losses) on derivative instruments held at year end
	$	247		$	(51	)	Other income (expense), net
	(56		)	19			Income tax expense
	$	191		$	(32	)	Net income

⁽¹⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. For additional details, refer to “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans.”

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Acquisitions

12 Months Ended

Dec. 31, 2018

Business Combinations [Abstract]

Acquisitions

Note 5 – Acquisitions

Griswold

On July 6, 2018, we acquired 100% of the membership interests in Griswold for an aggregate purchase price of $78.0 million, net of cash acquired, pursuant to the terms of the Membership Interest Purchase Agreement, dated July 6, 2018 by and among the Company and the owners of Griswold (the MIPA). We used borrowings of $82.5 million under our revolving credit facility to fund the acquisition. There was a possible earn-out capped at $3.0 million based on certain of Griswold’s 2018 product sales. At the time of acquisition, we determined that the probability of the earn-out was extremely low, and as a result, assigned no fair value to the contingent consideration as of the valuation date. No earn-out was actually paid based on the related sales results.

Griswold is a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions across the automotive, transportation, medical, office products, printing and electronics industries. The acquisition built on our existing EMS platform of engineered materials and added new products and capabilities to the portfolio of our EMS operating segment.

The acquisition has been accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill primarily related to the expected synergies from combining operations and the value of Griswold’s existing workforce, which is expected to be deductible for tax purposes. We also recorded other intangible assets related to acquired customer relationships, developed technology, trademarks and trade names, and a covenant not to compete.

The following table represents the fair values assigned to the acquired assets and liabilities assumed in the transaction. As of the filing date of this Form 10-K, the purchase accounting and purchase price allocation for the Griswold acquisition are substantially complete, as we continue to refine our valuation of certain acquired assets and assumed liabilities.

(Dollars in thousands)	July 6, 2018
Assets:
Accounts receivable, less allowance for doubtful accounts	$	2,553
Inventories	2,951
Other current assets	155
Property, plant & equipment	7,554
Other intangible assets	34,120
Goodwill	31,738
Total assets	79,071
Liabilities:
Accounts payable	711
Accrued employee benefits and compensation	299
Other accrued liabilities	92
Total liabilities	1,102
Fair value of net assets acquired	$	77,969

The other intangible assets consist of customer relationships valued at $22.1 million, developed technology valued at $9.6 million, trademarks and trade names valued at $1.8 million, and a covenant not to compete valued at $0.6 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 9.5 years for customer relationships, 3.5 years for developed technology, 10.4 years for trademarks and trade names, and 3.2 years for the covenant not to compete, resulting in amortization expenses ranging from $0.7 million to $3.0 million annually. The estimated annual future amortization expense is $2.8 million for 2019, $3.0 million for 2020, $2.8 million for 2021, $2.7 million for 2022, and $2.5 million for 2023.

During 2018, we incurred transaction costs of $1.1 million related to the Griswold acquisition, which were recorded within selling, general and administrative (SG&A) expenses in the consolidated statements of operations.

The results of Griswold have been included in our consolidated financial statements for the period subsequent to the completion of the acquisition on July 6, 2018, through December 31, 2018. Griswold’s net sales for that period totaled $13.7 million.

DSP

On January 6, 2017, we acquired the principal operating assets of DSP, pursuant to the terms of the Asset Purchase Agreement by and among the Company, DSP and the principal shareholders of DSP (the Purchase Agreement). Pursuant to the terms of the Purchase Agreement, we acquired certain assets and assumed certain liabilities of DSP for a total purchase price of approximately $60.2 million. We used borrowings of $30.0 million under our revolving credit facility in addition to cash on hand to fund the acquisition.

The acquisition was accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill primarily related to the expected synergies from combining operations and the value of the existing workforce. We also recorded other intangible assets related to customer relationships, developed technology, trade names and a covenant not to compete.

The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	January 6, 2017
Assets:
Accounts receivable	$	2,724
Prepaid expenses	21
Inventory	2,433
Property, plant & equipment	1,589
Other intangible assets	35,860
Goodwill	17,793
Total assets	60,420
Liabilities:
Accounts payable	179
Accrued expenses	50
Total liabilities	229
Fair value of net assets acquired	$	60,191

The other intangible assets consist of customer relationships valued at $30.5 million, developed technology valued at $1.8 million, trademarks valued at $3.3 million, and a covenant not to compete valued at $0.3 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 11.8 years for customer relationships, 4.3 years for developed technology, 11.7 years for trademarks, and 4.1 years for the covenant not to compete, resulting in amortization expenses ranging from $1.1 million to $2.0 million annually. The estimated annual future amortization expense is $1.8 million for each of 2019, 2020 and 2021, and $1.7 million for each of 2022 and 2023.

During 2017, we incurred transaction costs of $0.5 million related to the DSP acquisition, which were recorded within SG&A expenses in the consolidated statements of operations. DSP’s net sales totaled $22.3 million for the year ended December 31, 2017.

DeWAL

On November 23, 2016, we acquired all of the membership interests in DeWAL pursuant to the terms of the Membership Interest Purchase Agreement, dated November 23, 2016, by and among the Company and the owners of DeWAL for an aggregate purchase price of $135.5 million. We used borrowings of $136.0 million under our revolving credit facility to fund the acquisition.

The acquisition was accounted for in accordance with applicable purchase accounting guidance. We recorded goodwill, primarily related to the expected synergies from combining operations and the value of the existing workforce. We also recorded other intangible assets related to customer relationships, developed technology, trade names and covenants not to compete.

The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	November 23, 2016
Assets:
Cash and cash equivalents	$	1,539
Accounts receivable	7,513
Other current assets	691
Inventory	9,915
Property, plant & equipment	9,932
Other intangible assets	73,500
Goodwill	35,985
Other long-term assets	101
Total assets	139,176
Liabilities:
Accounts payable	2,402
Other current liabilities	1,292
Total liabilities	3,694
Fair value of net assets acquired	$	135,482

The other intangible assets consist of customer relationships valued at $46.7 million, developed technology valued at $22.0 million, trademarks valued at $4.3 million, and covenants not to compete valued at $0.5 million. The fair value of acquired identified other intangible assets was determined by applying the income approach, using several significant unobservable inputs for projected cash flows and a discount rate. These inputs are considered Level 3 under the fair value measurements and disclosure guidance.

At the acquisition date, the weighted average amortization period for the other intangible asset classes was 13.5 years for customer relationships, 8.6 years for developed technology, 5.2 years for trademarks, and 3.8 years for the covenants not to compete, resulting in amortization expenses ranging from $2.4 million to $4.3 million, annually. The future estimated annual amortization expense is $4.1 million for 2019, $4.3 million for each of 2020, 2021, 2022 and 2023.

During 2016, we incurred transaction costs of $2.1 million related to the DeWAL acquisition, which were recorded within SG&A expenses in the consolidated statements of operations. DeWAL’s net sales totaled $5.4 million for the year ended December 31, 2016.

Pro Forma Financial Information

The following unaudited pro forma financial information presents the combined results of operations of Rogers, Griswold, DSP, and DeWAL as if the Griswold acquisition had occurred on January 1, 2017, the DSP acquisition had occurred on January 1, 2016 and the DeWAL acquisition had occurred on January 1, 2015. The unaudited pro forma financial information is not intended to represent or be indicative of our consolidated results of operations that would have been reported had the Griswold, DSP, and DeWAL acquisitions been completed as of January 1, 2017, January 1, 2016 and January 1, 2015, respectively, and should not be taken as indicative of our future consolidated results of operations.

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	893,878	$	851,122	$	724,877
Net income	87,584		80,283		50,349

Isola Asset Acquisition

On August 28, 2018, the Company entered into an Asset Purchase Agreement (APA) with Isola USA Corp. (Isola) to acquire a production facility and related machinery and equipment located in Chandler, Arizona for cash consideration of $43.4 million. In connection with the APA, the Company also entered into a Transition Services Agreement and a Lease Agreement with Isola whereby Isola leases back a portion of the facility and related machinery and equipment from the Company during the transition period through December 31, 2019. We used cash on hand to fund the asset purchase. This transaction was evaluated under ASC 805, Business Combinations and was determined to be an asset acquisition as the transaction did not meet the definition of a business.

The assets acquired in connection with the acquisition were recorded by the Company at their estimated relative fair values as follows:

(Dollars in thousands)	August 28, 2018
Land	$	6,104
Buildings	8,401
Machinery and equipment	18,616
Equipment in process	12,633
Total property, plant and equipment	$	45,754

The $45.8 million of capitalized cost summarized above includes both lease consideration valued at $2.0 million and transaction costs incurred of $0.4 million.

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Note 6 – Property, Plant and Equipment

	As of December 31,
(Dollars in thousands)	2018			2017
Land	$	21,525		$	14,620
Buildings and improvements	175,279			135,191
Machinery and equipment	256,301			238,000
Office equipment	64,886			56,554
Property plant and equipment, gross	517,991			444,365
Accumulated depreciation	(317,414		)	(289,909		)
Property, plant and equipment, net	200,577			154,456
Equipment in process	42,182			25,155
Total property, plant and equipment, net	$	242,759		$	179,611

Depreciation expense was $33.5 million in 2018, $29.3 million in 2017 and $26.6 million in 2016. Additionally, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition.

In the second quarter of 2017, we began actively marketing for sale unutilized property in Chandler, Arizona, consisting of a building and two adjacent parcels of land with an aggregate net book value of $0.9 million. In the second quarter of 2018, we completed the sale of the building and one parcel of land and recognized a gain on sale of approximately $0.4 million in operating income. The remaining parcel of land, which was previously classified as held for sale, had a net book value of $0.4 million and was reclassified in the third quarter of 2018 to held and used as the initial held for sale classification had surpassed one year.

In the third quarter of 2017, we completed the sale of a facility located in Belgium that had been classified as held for sale as of June 30, 2017 and recognized a gain on sale of approximately $4.4 million in operating income.

In the first quarter of 2017, we completed the planned sale of a parcel of land in Belgium that had been classified as held for sale as of December 31, 2016 and recognized a gain on sale of approximately $0.9 million in operating income.

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Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Note 7 – Goodwill and Other Intangible Assets

On July 6, 2018, we acquired Griswold. For further detail on the goodwill and other intangible assets recorded in connection with the acquisition, refer to “Note 5 – Acquisitions.”

Goodwill

The changes in the carrying amount of goodwill for the period ending December 31, 2018, by operating segment, were as follows:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions			Power Electronics Solutions			Other		Total
December 31, 2017	$	51,693	$	111,575		$	71,615		$	2,224	$	237,107
Acquisition	—		32,305			—			—		32,305
Purchase accounting adjustment	—		(567		)	—			—		(567		)
Foreign currency translation adjustment	—		(724		)	(3,236		)	—		(3,960		)
December 31, 2018	$	51,693	$	142,589		$	68,379		$	2,224	$	264,885

Other Intangible Assets

The changes in the carrying amount of other intangible assets for the two-year period ending December 31, 2018, were as follows:

	December 31, 2018						December 31, 2017
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	149,753	$	30,078	$	119,675	$	128,907	$	22,514	$	106,393
Technology	81,535		38,624		42,911		73,891		33,491		40,400
Trademarks and trade names	12,019		3,213		8,806		10,213		2,157		8,056
Covenants not to compete	1,340		249		1,091		1,799		1,108		691
Total definite-lived other intangible assets	244,647		72,164		172,483		214,810		59,270		155,540
Indefinite-lived other intangible asset	4,525		—		4,525		4,738		—		4,738
Total other intangible assets	$	249,172	$	72,164	$	177,008	$	219,548	$	59,270	$	160,278

In the table above, gross carrying amounts and accumulated amortization may differ from prior periods due to foreign exchange rate fluctuations.

Amortization expense was approximately $16.5 million, $14.8 million and $11.2 million in 2018, 2017 and 2016, respectively. The estimated annual future amortization expense is $17.7 million, $14.6 million, $13.8 million, $13.3 million and $12.7 million in 2019, 2020, 2021, 2022 and 2023, respectively. These amounts could vary based on changes in foreign currency exchange rates.

The weighted average amortization period as of December 31, 2018, by definite-lived other intangible asset class, is presented in the table below:

Definite-Lived Other Intangible Asset Class	Weighted Average Remaining Amortization Period
Customer relationships	7.6
Technology	4.4
Trademarks and trade names	5.0
Covenants not to compete	2.1
Total definite-lived other intangible assets	6.6

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Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Note 8 – Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding.

The following table sets forth the computation of basic and diluted earnings per share:

	Years Ended December 31,
(In thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	87,651	$	80,459	$	48,283
Denominator:
Weighted-average shares outstanding - basic	18,374		18,154		17,991
Effect of dilutive shares	285		393		232
Weighted-average shares outstanding - diluted	18,659		18,547		18,223
Basic earnings per share:	$	4.77	$	4.43	$	2.68
Diluted earnings per share:	$	4.70	$	4.34	$	2.65

Certain options to purchase shares were excluded from the calculation of diluted weighted-average shares outstanding because the exercise price was greater than the average market price of our capital stock during the year. For 2018, 36,642 shares were excluded. No shares were excluded in 2017 and 2016.

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Capital Stock and Equity Compensation

12 Months Ended

Dec. 31, 2018

Share-based Compensation [Abstract]

Capital Stock and Equity Compensation

Note 9 – Capital Stock and Equity Compensation

Capital Stock

Our 2009 Long-Term Equity Compensation Plan, which expired in early February 2019, permitted the granting of restricted stock units and certain other forms of equity awards to officers and other key employees. Under this plan, we also awarded each non-management director deferred stock units, which permitted non-management directors to receive, at a later date, one share of Rogers capital stock for each deferred stock unit, with no payment of any consideration by the director at the time the shares were received.

Shares of capital stock reserved for possible future issuance were as follows:

	As of December 31,
	2018	2017
Shares reserved for issuance under the stock acquisition program(1)	—	120,883
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan(2)	—	169,044
Shares reserved for issuance under outstanding stock options and restricted stock unit awards	413,294	545,018
Deferred compensation to be paid in stock, including deferred stock units	13,498	17,100
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan(3)	777,385	793,603
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees	106,344	117,987
Total	1,310,521	1,763,635

⁽¹⁾  The Company ceased offering capital stock under the stock acquisition program prior to the periods covered by this table.

⁽²⁾  The Company ceased offering its capital stock as an investment option under the Rogers Employee Savings and Investment Plan prior to the periods covered by this table.

⁽³⁾ This plan expired in early February 2019, and these shares are no longer available for issuance thereunder.

Equity Compensation

Performance-Based Restricted Stock Units

As of December 31, 2018, we had performance-based restricted stock units from 2018, 2017 and 2016 outstanding. These awards generally cliff vest at the end of a three year measurement period. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed during the measurement period. Participants are eligible to be awarded shares ranging from 0% to 200% of the original award amount, based on certain defined performance measures.

The outstanding awards have one measurement criteria: the three year total shareholder return (TSR) on our capital stock as compared to that of a specified group of peer companies. The TSR measurement criteria of the awards is considered a market condition. As such, the fair value of this measurement criteria is determined on the grant date using a Monte Carlo simulation valuation model. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards. We account for forfeitures as they occur.

Below were the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2018 and 2017:

	September 17, 2018	February 8, 2018	February 9, 2017
Expected volatility	36.6%	34.8%	33.6%
Expected term (in years)	3.0	3.0	3.0
Risk-free interest rate	2.85%	2.28%	1.38%

Expected volatility – In determining expected volatility, we have considered a number of factors, including historical volatility.

Expected term – We use the vesting period of the award to determine the expected term assumption for the Monte Carlo simulation valuation model.

Risk-free interest rate – We use an implied “spot rate” yield on U.S. Treasury Constant Maturity rates as of the grant date for our assumption of the risk-free interest rate.

Expected dividend yield – We do not currently pay dividends on our capital stock; therefore, a dividend yield of 0% was used in the Monte Carlo simulation valuation model.

A summary of activity of the outstanding performance-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	169,202		$	97.16	151,769		$	89.72	107,229		$	66.13
Awards granted	75,760		163.55		56,147		110.77		84,443		69.01
Stock issued	(81,230	)	131.72		(34,442	)	86.59		(25,397	)	72.68
Awards forfeited	(21,298	)	114.40		(4,272	)	99.35		(14,506	)	104.83
Awards outstanding as of December 31	142,434		$	110.19	169,202		$	97.16	151,769		$	89.72

We recognized $4.4 million, $4.7 million and $4.6 million of compensation expense related to performance-based restricted stock units for the years ended December 31, 2018, 2017 and 2016, respectively. As of December 31, 2018, there was $6.0 million of total unrecognized compensation cost related to unvested performance-based restricted stock units. That cost is expected to be recognized over a weighted-average period of 0.9 years.

Time-Based Restricted Stock Units

As of December 31, 2018, we had time-based restricted stock unit awards from 2018, 2017 and 2016 outstanding. The outstanding awards all ratably vest on the first, second and third anniversaries of the original grant date. However, employees whose employment terminates during the measurement period due to death, disability, or, in certain cases, retirement may receive a pro-rata payout based on the number of days they were employed subsequent to the last grant anniversary date. Each time-based restricted stock unit represents a right to receive one share of the Rogers’ capital stock at the end of the vesting period. The fair value of the award is determined by the market value of the underlying stock price at the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period. We account for forfeitures as they occur.

A summary of activity of the outstanding time-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	173,331		$	69.10	239,189		$	57.71	208,318		$	64.27
Awards granted	46,810		143.93		80,535		83.17		118,660		51.70
Stock issued	(82,921	)	84.92		(140,208	)	58.18		(60,326	)	64.03
Awards forfeited	(19,744	)	112.06		(6,185	)	60.70		(27,463	)	64.60
Awards outstanding as of December 31	117,476		$	116.10	173,331		$	69.10	239,189		$	57.71

We recognized $5.6 million, $5.7 million and $5.6 million of compensation expense related to time-based restricted stock units for the years ended December 31, 2018, 2017 and 2016, respectively. As of December 31, 2018, there was $6.7 million of total unrecognized compensation cost related to unvested time-based restricted stock units. That cost is expected to be recognized over a weighted-average period of 0.9 years.

Deferred Stock Units

We grant deferred stock units to non-management directors. These awards are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. Each deferred stock unit results in the issuance of one share of Rogers’ capital stock. The grant of deferred stock units is typically done annually during the second quarter of each year. The fair value of the award is determined by the market value of the underlying stock price at the grant date.

A summary of activity of the outstanding deferred stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	9,250		$	109.48	11,900		$	58.82	23,950		$	27.22
Awards granted	8,400		108.86		9,250		109.48		11,900		58.82
Stock issued	(9,250	)	109.48		(11,900	)	58.82		(23,950	)	52.69
Awards outstanding as of December 31	8,400		$	108.86	9,250		$	109.48	11,900		$	58.82

We recognized compensation expense related to deferred stock units of $0.9 million, $1.0 million and $0.7 million, for the years ended December 31, 2018, 2017 and 2016, respectively.

Stock Options

Stock options have been granted under various equity compensation plans. The maximum contractual term for all options is normally 10 years. We have not granted any stock options since the first quarter of 2012. As of February 2016, all outstanding stock option awards were fully vested and the related compensation cost had been expensed. The total grant-date fair value of stock options that vested during 2016 and the equity compensation expense related to stock options that we recognized in 2016 were both de minimis.

During the years ended December 31, 2018 and 2017, the total intrinsic value of options exercised (i.e., the difference between the market price at time of exercise and the price paid by the individual to exercise the options) was $2.4 million and $6.0 million, respectively. The total amount of cash received from the exercise of these options was $0.9 million and $3.1 million, during the years ended December 31, 2018 and 2017, respectively.

A summary of the activity under our stock option plans for 2018, 2017 and 2016, is presented below:

	2018				2017				2016
	Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share
Options outstanding, vested and exercisable as of January 1	33,283		$	36.40	116,575		$	37.76	212,038		$	40.47
Options exercised	(22,333	)	38.57		(83,292	)	37.04		(95,113	)	43.56
Options forfeited	—		—		—		—		(350	)	44.32
Options outstanding, vested and exercisable as of December 31	10,950		$	31.99	33,283		$	36.40	116,575		$	37.76

As of December 31, 2018 and 2017, our outstanding stock options had a weighted-average remaining contractual life of 2.0 years and 2.2 years, respectively, and an aggregate intrinsic value of $0.7 million and $4.2 million, respectively.

Employee Stock Purchase Plan

We have an ESPP that allows eligible employees to purchase, through payroll deductions, shares of our capital stock at a discount to fair market value. The ESPP has twosix-month offering periods each year, the first beginning in January and ending in June and the second beginning in July and ending in December. The ESPP contains a look-back feature that allows the employee to acquire stock at a 15% discount from the underlying market price at the beginning or end of the applicable period, whichever is lower. We recognize compensation expense on this plan ratably over the offering period based on the fair value of the anticipated number of shares that will be issued at the end of each offering period. Compensation expense is adjusted at the end of each offering period for the actual number of shares issued. Fair value is determined based on two factors: (i) the 15% discount on the underlying stock’s market value on the first day of the applicable offering period, and (ii) the fair value of the look-back feature determined by using the Black-Scholes model. We recognized approximately $0.3 million of compensation expense associated with the plan for the year ended December 31, 2018, and $0.5 million for each of the years ended December 31, 2017 and 2016, respectively.

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Joint Ventures

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Joint Ventures

Note 10 – Joint Ventures

As of December 31, 2018, we had two joint ventures, each 50% owned, which are accounted for under the equity method of accounting.

Joint Venture	Location	Operating Segment	Fiscal Year-End
Rogers INOAC Corporation (RIC)	Japan	Elastomeric Material Solutions	October 31
Rogers INOAC Suzhou Corporation (RIS)	China	Elastomeric Material Solutions	December 31

We recognized equity income related to the joint ventures of $5.5 million, $4.9 million and $4.1 million for the years ended December 31, 2018, 2017 and 2016, respectively. These amounts are presented in“Equity income in unconsolidated joint ventures” on our consolidated statements of operations.

The summarized financial information for the joint ventures for the periods indicated was as follows:

	As of December 31,
(Dollars in thousands)	2018		2017
Current assets	$	38,730	$	40,934
Non-current assets	$	4,839	$	4,947
Current liabilities	$	6,376	$	9,519
Shareholders' equity	$	37,193	$	36,362

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	55,465	$	54,597	$	47,321
Gross profit	$	21,229	$	21,462	$	16,829
Net income	$	11,002	$	9,796	$	8,292

Receivables from and payables to joint ventures arise during the normal course of business from transactions between us and the joint ventures. As ofDecember 31, 2018and2017, we had receivables of$1.5 millionand$3.7 million, respectively, due from RIC, RIS, our affiliated partner in the joint ventures, as well as its subsidiaries. These receivables are included in “Accounts receivable, less allowance for doubtful accounts” on our consolidated statements of financial position. As ofDecember 31, 2018and2017, we owed payables of$2.3 millionand$2.1 million, respectively, to RIC and RIS. These payables are included in “Accounts payable” on our consolidated statements of financial position.

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Debt and Capital Leases

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Debt and Capital Leases

Note 11 – Debt and Capital Leases

Debt

On February 17, 2017, we entered into a secured five year credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto (the Third Amended Credit Agreement), which increased the principal amount of our revolving credit facility to up to $450.0 million borrowing capacity, with sublimits for multicurrency borrowings, letters of credit and swing-line notes, and provided an additional $175.0 million accordion feature. Borrowings may be used to finance working capital needs, for letters of credit and for general corporate purposes in the ordinary course of business, including the financing of permitted acquisitions (as defined in the Third Amended Credit Agreement).

In 2018, we borrowed $82.5 million under our revolving credit facility to fund the acquisition of Griswold and an additional $20.0 million to fund the Merged Plan as part of the proposed plan termination process.

Borrowings under the Third Amended Credit Agreement can be made as alternate base rate loans or euro-currency loans. Alternate base rate loans bear interest that includes a base reference rate plus a spread of 37.5 to 75.0 basis points, depending on our leverage ratio. The base reference rate is the greater of the prime rate; federal funds effective rate (or the overnight bank funding rate, if greater) plus 50 basis points. Euro-currency loans bear interest based on adjusted LIBOR plus a spread of 137.5 to 175.0 basis points, depending on our leverage ratio. Based on our leverage ratio as of December 31, 2018, the spread was 150.0 basis points.

We incurred interest expense on our outstanding debt of $6.1 million, $5.2 million, and $3.1 million for the years ended December 31, 2018, 2017 and 2016, respectively.

In addition to interest payable on the principal amount of indebtedness outstanding from time to time under the Third Amended Credit Agreement, we are required to pay a quarterly fee of 20 to 30 basis points (based upon our leverage ratio) of the unused amount of the lenders’ commitments under the Third Amended Credit Agreement. We incurred an unused commitment fee of $0.6 million, $0.6 million and $0.4 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The Third Amended Credit Agreement contains customary representations, warranties, covenants, mandatory prepayments and events of default under which our payment obligations may be accelerated. If an event of default occurs, the lenders may, among other things, terminate their commitments and declare all outstanding borrowings to be immediately due and payable together with accrued interest and fees. The financial covenants include requirements to maintain (1) a leverage ratio of no more than 3.25 to 1.00, subject to an election to increase the maximum leverage ratio to 3.50 to 1.00 for one fiscal year in connection with a permitted acquisition, and (2) an interest coverage ratio of no less than 3.00 to 1.00.

All obligations under the Third Amended Credit Agreement are guaranteed by each of our existing and future material domestic subsidiaries, as defined in the Third Amended Credit Agreement (the Guarantors). The obligations are also secured by a Third Amended and Restated Pledge and Security Agreement, dated as of February 17, 2017, entered into by us and the Guarantors which grants to the administrative agent, for the benefit of the lenders, a security interest, subject to certain exceptions, in substantially all of the non-real estate assets of the Guarantors. These assets include, but are not limited to, receivables, equipment, intellectual property, inventory, and stock in certain subsidiaries.

All revolving loans are due on the maturity date, February 17, 2022. We are not required to make any quarterly principal payments under the Third Amended Credit Agreement and as of December 31, 2018, we had $228.5 million in outstanding borrowings under our revolving credit facility. However, we made discretionary principal payments totaling $5.0 million and $110.2 million on our revolving credit facility in 2018 and 2017, respectively.

As of December 31, 2018, we had $1.7 million of outstanding line of credit issuance costs that will be amortized over the life of the Third Amended Credit Agreement, which will terminate in February 2022. We recorded amortization expense of $0.6 million and $0.5 million for the years ended December 31, 2018 and 2017, respectively, related to these deferred costs.

In March 2017, we entered into an interest rate swap to hedge the variable interest rate on $75.0 million of our $450.0 million revolving credit facility. For further information regarding the interest rate swap, refer to “Note 3 – Hedging Transactions and Derivative Financial Instruments.”

Restriction on Payment of Dividends

Our Third Amended Credit Agreement generally permits us to pay cash dividends to our shareholders, provided that (i) no default or event of default has occurred and is continuing or would result from the dividend payment and (ii) our leverage ratio does not exceed 2.75 to 1.00. If our leverage ratio exceeds 2.75 to 1.00, we may nonetheless make up to $20.0 million in restricted payments, including cash dividends, during the fiscal year, provided that no default or event of default has occurred and is continuing or would result from the payments. Our leverage ratio did not exceed 2.75 to 1.00 as of December 31, 2018.

Capital Leases

We have a capital lease obligation related to our manufacturing facility in Eschenbach, Germany. Under the terms of the leasing agreement, we have an option to purchase the property upon the expiration of the lease in 2021 at a price which is the greater of (i) the then-current market value or (ii) the residual book value of the land including the buildings and installations thereon. The total obligation recorded for this lease as of December 31, 2018 and 2017 was $5.0 million and $5.7 million, respectively. Depreciation expense related to this capital lease was $0.3 million for each of the years ending December 31, 2018, 2017 and 2016. The depreciation expense related to this capital lease was recorded in “Cost of sales” onour consolidated statements of operations. Accumulated depreciation as of December 31, 2018 and 2017 was $3.5 million and $3.3 million, respectively.

We also incurred an immaterial amount of interest expense on this capital lease for the years ended December 31, 2018, 2017 and 2016, respectively. The interest expense related to this capital lease was recorded in “Interest expense, net” on our consolidated statements of operations.

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Pension, Other Postretirement Benefits and Employee Savings and Investment Plans

Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans

Pension and Other Postretirement Benefits

As of December 31, 2018, we had two qualified noncontributory defined benefit pension plans: 1) the Union Plan and 2) the Merged Plan. All qualified noncontributory defined benefit pension plans have been frozen and have ceased accruing benefits.

The Company also maintains the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2004 and the Rogers Corporation Amended and Restated Pension Restoration Plan effective as of January 1, 2005 (collectively, the Nonqualified Plans). The Nonqualified Plans serve to restore certain retirement benefits that might otherwise be lost due to limitations imposed by federal law on qualified pension plans, as well as to provide supplemental retirement benefits, for certain senior executives of the Company. In addition, we sponsor multiple fully insured or self-funded medical plans and life insurance plans for certain retirees. The measurement date for all plans is December 31^st for each respective plan year.

We are required, as an employer, to: (a) recognize in our consolidated statements of financial position an asset for a plan’s overfunded status or a liability for a plan’s underfunded status; (b) measure a plan’s assets and our obligations that determine our funded status as of the end of the year; and (c) recognize changes in the funded status of a defined benefit postretirement plan in the year in which the changes occur and report these changes in accumulated other comprehensive loss. In addition, actuarial gains and losses that are not immediately recognized as net periodic pension cost are recognized as a component of accumulated other comprehensive loss and amortized into net periodic pension cost in future periods.

Pension Plan Merger and Proposed Termination

The Company currently intends to terminate the Merged Plan and has requested a determination letter from the IRS. The termination of the Merged Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Merged Plan and we expect the settlement process to be completed in 2019. The Company lacked sufficient information as of December 31, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Union Plan.

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
Change in benefit obligation:	2018			2017			2018			2017
Benefit obligation at beginning of year	$	185,760		$	177,696		$	2,037		$	2,504
Service cost	—			—			73			80
Interest cost	6,758			7,356			62			71
Actuarial (gain) loss	(10,805		)	9,601			(5		)	460
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Plan amendment	—			—			—			(545		)
Benefit obligation at end of year	$	172,608		$	185,760		$	1,803		$	2,037

Change in plan assets:	2018			2017			2018			2017
Fair value of plan assets at the beginning of the year	$	180,056		$	171,778		$	—		$	—
Actual return on plan assets	(4,299		)	16,799			—			—
Employer contributions	25,000			372			364			533
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Fair value of plan assets at the end of the year	191,652			180,056			—			—
Funding status	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

Amounts included in the consolidated statements of financial position consist of:

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018			2017
Noncurrent assets	$	19,273		$	3,021		$	—		$	—
Current liabilities	(4		)	(5		)	(334		)	(352		)
Noncurrent liabilities	(225		)	(8,720		)	(1,469		)	(1,685		)
Net amount recognized at end of year	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018		2017
Net actuarial (loss) gain	$	(59,972	)	$	(59,645	)	$	68	$	63
Prior service benefit	—			—			1,220		2,821
Net amount recognized at end of year	$	(59,972	)	$	(59,645	)	$	1,288	$	2,884

The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with an accumulated benefit obligation in excess of plan assets were $0.2 million, $0.2 million and $0.0 million, respectively, as of December 31, 2018 and $155.8 million, $155.8 million and $147.1 million, respectively, as of December 31, 2017.

The projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were $172.4 million, $172.4 million and $191.7 million, respectively, as of December 31, 2018. For 2017, the projected benefit obligation, accumulated benefit obligation, and fair value of plan assets for the pension plans with plan assets in excess of an accumulated benefit obligation were $30.0 million, $30.0 million and $33.0 million, respectively.

Components of Net Periodic (Benefit) Cost

(Dollars in thousands)	Pension Benefits									Retirement Health and Life Insurance Benefits
	2018			2017			2016			2018			2017			2016
Service cost	$	—		$	—		—			$	73		$	80		$	133
Interest cost	6,758			7,356			7,530			62			71			75
Expected return of plan assets	(8,662		)	(9,221		)	(10,808		)	—			—			—
Amortization of prior service cost (credit)	—			—			—			(1,602		)	(1,602		)	(1,489		)
Amortization of net loss	1,828			1,755			1,784			—			—			(47		)
Settlement charge	—			—			—			—			—			—
Net periodic benefit cost (benefit)	$	(76	)	$	(110	)	$	(1,494	)	$	(1,467	)	$	(1,451	)	$	(1,328	)

The estimated net loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $1.8 million. The estimated net benefit for the defined benefit postretirement plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $1.0 million.

Weighted-average assumptions used to determine benefit obligations at December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	4.25	%	3.70	%	3.75	%	3.25	%

Weighted-average assumptions used to determine net benefit cost for the years ended December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	3.70	%	4.25	%	3.25	%	3.25	%
Expected long-term rate of return on plan assets	4.94	%	5.51	%	—	%	—	%

Rate of compensation increase - An expected rate of compensation increase was not included in the weighted average assumptions as there would be no impact to the net benefit cost, as the plans have been previously frozen.

Discount rate - To determine the discount rate, we review current market indices of high quality corporate bonds, particularly the PruCurve index, to ensure that the rate used in our calculations is consistent and within an acceptable range based on these indices, which reflect current market conditions. The market-based rates are modified to be Rogers-specific, which is done by applying our pension benefit cash flow projections to the generic index rate.

Long-term rate of return on assets - To determine the expected long-term rate of return on plan assets, we review historical and projected portfolio performance, the historical long-term rate of return, and we consider how any change in the allocation of the assets could affect the anticipated returns. Adjustments are made to the projected rate of return if it is deemed necessary based on those factors and other current market trends.

Health care cost trend rates - For measurement purposes as of December 31, 2018, we assumed an annual health care cost trend rates of 7.00% and 7.00% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. The rates were assumed to decrease gradually by 0.25% annually until reaching 4.50% and 4.50%, respectively, and remain at those levels thereafter. For measurement purposes as of December 31, 2017, we assumed annual health care cost trend rates of 7.25% and 7.25% for covered health care benefits for retirees pre-age 65 and post-age 65, respectively. Assumed health care cost trend rates may have a significant effect on the amounts reported for the health care plans. A one-percentage point change in assumed health care cost trend rates would have been expected to have the following effects as of December 31, 2018:

(Dollars in thousands)	Increase		Decrease
Effect on total service and interest cost	$	8	$	(8	)
Effect on other postretirement benefit obligations	$	65	(60		)

Pension Plan Assets

Our defined benefit pension assets are invested with the objective of achieving a total rate of return over the long-term that is sufficient to fund future pension obligations. In managing these assets and our investment strategy, we take into consideration future cash contributions to the plans, as well as the potential of the portfolio underperforming the market, which is partially mitigated by maintaining a diversified portfolio of assets.

In order to meet our investment objectives, we set asset allocation target ranges based on current funding status and future projections in order to mitigate the risk in the plan while maintaining its funded status. In November 2014, we implemented a pension risk reduction strategy related to our investments, which included a change in our asset mix to hold a larger amount of fixed income securities. As of December 31, 2018, we held approximately 1% equity securities and 99% fixed income and short-term cash securities in our portfolio, compared to December 31, 2017 when we held approximately 4% equity securities and 96% fixed income securities.

In determining our investment strategy and calculating the net benefit cost, we utilized an expected long-term rate of return on plan assets. This rate is developed based on several factors, including the plans’ asset allocation targets, the historical and projected performance on those asset classes, and the plans’ current asset composition. To justify our assumptions, we analyze certain data points related to portfolio performance. For example, we analyze the actual historical performance of our total plan assets, which has generated a return of approximately 7.05% over the past 20 year period. Based on the historical returns and the projected future returns, we determined that a target return of 4.69% is appropriate for the current portfolio. Investments were stated at fair value as of the dates reported.

Securities traded on a national securities exchange are valued at the last reported sales price on the last business day of the plan year. The fair value of the guaranteed deposit account was determined through discounting expected future investment cash flow from both investment income and repayment of principal for each investment purchased.

The estimated fair values of the participation units owned by the plan in pooled separate accounts were based on quoted redemption values and adjusted for management fees and asset charges, as determined by the recordkeeper, on the last business day of the relevant plan year. Pooled separate accounts are accounts established solely for the purpose of investing the assets of one or more plans. Funds in a separate account are not commingled with other Company assets for investment purposes.

The following table presents the fair value of the pension plan net assets by asset category and level, within the fair value hierarchy, as of December 31, 2018 and 2017.

	Assets at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	1,216	$	—	$	1,216
Fixed income bonds	—		186,385		—		186,385
Mutual funds	2,691		—		—		2,691
Guaranteed deposit account	—		—		1,360		1,360
Total assets at fair value	$	2,691	$	187,601	$	1,360	$	191,652

	Assets at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	4,610	$	—	$	4,610
Fixed income bonds	—		162,934		—		162,934
Mutual funds	6,223		—		—		6,223
Guaranteed deposit account	—		—		6,289		6,289
Total assets at fair value	$	6,223	$	167,544	$	6,289	$	180,056

The table below sets forth a summary of changes in the fair value of the guaranteed deposit account’s Level 3 assetsfor the year ended December 31, 2018:

(Dollars in thousands)	Guaranteed Deposit Account
Balance at beginning of year	$	6,289
Change in unrealized gain (loss)	(194		)
Purchases, sales, issuances and settlements (net)	(4,735		)
Balance at end of year	$	1,360

Cash Flows

Contributions

We made a voluntary contribution of $25.0 million to the Merged Plan during the third quarter of 2018 as part of the proposed plan termination process. We made required contributions of $0.4 million to our qualified defined benefit pension plans in 2017. As there is no funding requirement for the Nonqualified Plans or the Retiree Health and Life Insurance benefit plans, we fund the amount of benefit payments made during the year.

Estimated Future Payments

The following pension benefit payments are expected to be paid through the utilization of plan assets for the funded plans and from the Company’s operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from the Company’s operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2018.

(Dollars in thousands)	Pension Benefits		Retiree Health and Life Insurance Benefits
2019	$	9,500	$	334
2020	$	9,597	$	265
2021	$	9,818	$	171
2022	$	10,038	$	134
2023	$	10,228	$	151
2024-2028	$	53,901	$	825

Employee Savings and Investment Plans

We sponsor the Rogers Employee Savings and Investment Plan (RESIP), a 401(k) plan for domestic employees. Employees can defer an amount they choose, up to the annual IRS limit of $18,500. Certain eligible participants are also allowed to contribute the maximum catch-up contribution per IRS regulations. Our matching contribution is 6% of an eligible employee’s annual pre-tax contribution at a rate of 100% for the first 1% and 50% for the next 5% for a total match of 3.5%. Unless otherwise indicated by the participant, the matching dollars are invested in the same funds as the participant’s contributions. RESIP related expense amounted to $5.6 million in 2018, $4.0 million in 2017 and $3.0 million in 2016, which related solely to our matching contributions.

We acquired Griswold in July 2018 and eligible Griswold employees were included in the Griswold LLC 401K Plan. As of January 2019, eligible Griswold employees are being included in the RESIP. Compensation expense related to the additional Griswold employees was de minimis in 2018. We acquired DSP in January 2017 and DeWAL in November 2016. Eligible DSP and DeWAL employees were included in the RESIP as of the third quarter of 2017 and the first quarter of 2018, respectively. Compensation expense related to the additional DSP and DeWAL employees was de minimis in 2017. DeWAL employees were initially included under the DeWAL Industries, Inc. 401k Profit Sharing Plan (DeWAL Plan) from the acquisition date through the end of 2017. The DeWAL Plan matching contribution was 100% of the first 3% of employee pre-tax contributions.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 13 – Commitments and Contingencies

Leases

Our principal non-cancelable operating lease obligations are for building space and vehicles. The leases generally provide that we pay maintenance costs. The lease periods typically range from one to five years and include purchase or renewal provisions. We have leases that are cancelable with minimal notice. Additionally, we have capital leases for our manufacturing facility in Eschenbach, Germany as well as office related equipment in various worldwide locations.

The following table includes future minimum lease payments under capital leases together with the present value of the net future minimum lease payments as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	543
2020	525
2021	4,276
2022	—
2023	—
Thereafter	—
Total	5,344
Less: Interest	(295		)
Present Value of Net Future Minimum Lease Payments	$	5,049

The following table includes future minimum lease payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	3,951
2020	3,052
2021	2,216
2022	1,507
2023	491
Thereafter	—
Total	$	11,217

The following table includes lease expense for each of the three years ended December 31, 2018:

	For the Year Ended December 31,
(Dollars in thousands)	2018		2017		2016
Operating Leases	$	3,850	$	3,819	$	3,567
Capital Leases	$	472	$	608	$	564

Environmental & Legal

We are currently engaged in the following environmental and legal proceedings:

Voluntary Corrective Action Program

Our location in Rogers, Connecticut is part of the Connecticut Voluntary Corrective Action Program (VCAP). As part of this program, we partnered with the Connecticut Department of Energy and Environmental Protection (CT DEEP) to determine the corrective actions to be taken at the site related to contamination issues. We evaluated this matter and completed internal due diligence work related to the site in the fourth quarter of 2015. Remediation activities on the site are ongoing and are recorded as reductions to the accrual as they are incurred. We have incurred aggregate remediation costs of $0.7 million through December 31, 2018, and the accrual for future remediation efforts is $1.7 million.

Asbestos

Overview

We, like many other industrial companies, have been named as a defendant in a number of lawsuits filed in courts across the country by persons alleging personal injury from exposure to products containing asbestos. We have never mined, milled, manufactured or marketed asbestos; rather, we made and provided to industrial users a limited number of products that contained encapsulated asbestos, but we stopped manufacturing these products in the late 1980s. Most of the claims filed against us involve numerous defendants, sometimes as many as several hundred.

The following table summarizes the change in number of asbestos claims outstanding during 2018 and 2017:

	2018		2017
Claims outstanding at beginning of year	687		605
New claims filed	275		362
Pending claims concluded*	(217	)	(280	)
Claims outstanding at end of year	745		687

* For the year ended December 31, 2018, 192 claims were dismissed and 25 claims were settled. For the year ended December 31, 2017, 258 claims were dismissed and 22 claims were settled.Settlements totaled approximately $7.1 million for the year ended December 31, 2018, compared to $5.0 million for the year ended December 31, 2017.

Impacts on Financial Statements

We recognize a liability for asbestos-related contingencies that are probable of occurrence and reasonably estimable. In connection with the recognition of liabilities for asbestos-related matters, we record asbestos-related insurance receivables that are deemed probable.

The liability projection period covers all current and future claims through 2058, which represents the expected end of our asbestos liability exposure with no further ongoing claims expected beyond that date. This conclusion was based on our history and experience with the claims data, the diminished volatility and consistency of observable claims data, the period of time that has elapsed since we stopped manufacturing products that contained encapsulated asbestos and an expected downward trend in claims due to the average age of our claimants, which is approaching the average life expectancy.

To date, the defense and settlement costs of our asbestos-related product liability litigation have been substantially covered by insurance. We have identified continuous coverage for primary, excess and umbrella insurance from the 1950s through the mid-1980s, except for a period in the early 1960s, with respect to which we have entered into an agreement for primary, but not excess or umbrella, coverage. In addition, we have entered into a cost sharing agreement with most of our primary, excess and umbrella insurance carriers to facilitate the ongoing administration and payment of claims by the carriers. The cost sharing agreement may be terminated by any party, but will continue until a party elects to terminate it. As of the filing date for this report, the agreement has not been terminated, and no carrier had informed us it intended to terminate the agreement. During 2018, we received notices that primary coverage for a period of eight years and excess coverage for a period of three years had been exhausted. In 2018, we incurred indemnity and defense costs of $1.2 million for the year ended December 31, 2018, primarily related to the periods referenced above. We expect to exhaust individual primary, excess and umbrella coverages over time, and there is no assurance that such exhaustion will not accelerate due to additional claims, damages and settlements or that coverage will be available as expected.

The amounts recorded for the asbestos-related liability and the related insurance receivables are based on facts known at the time and a number of assumptions. However, projecting future events, such as the number of new claims to be filed each year, the average cost of disposing of such claims, the length of time it takes to dispose of such claims, coverage issues among insurers and the continuing solvency of various insurance companies, as well as the numerous uncertainties surrounding asbestos litigation in the United States, could cause the actual liability and insurance recoveries for us to be higher or lower than those projected or recorded.

Changes recorded in the estimated liability and estimated insurance recovery based on the projections of asbestos litigation and corresponding insurance coverage, result in the recognition of expense or income. For the years ended December 31, 2018, 2017 and 2016, we recognized expense of $0.7 million, $3.4 million and $0.3 million, respectively. The increase in expense recognized in 2017 compared to 2016 was primarily attributable to the change in the forecast period from 10 years to 40 years.

For the years ended December 31, 2018 and 2017, our projected asbestos-related claims and insurance receivables were as follows:

(Dollars in millions)	2018		2017
Asbestos-related claims	$	70.3	$	76.2
Asbestos-related insurance receivables	$	63.8	$	69.2

General

In addition to the above issues, the nature and scope of our business brings us in regular contact with the general public and a variety of businesses and government agencies. Such activities inherently subject us to the possibility of litigation, including environmental and product liability matters that are defended and handled in the ordinary course of business. We have established accruals for matters for which management considers a loss to be probable and reasonably estimable. It is the opinion of management that facts known at the present time do not indicate that such litigation will have a material adverse impact on our results of operations, financial position or cash flows.

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Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Note 14 – Income Taxes

The “Income before income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	2018		2017		2016
Domestic	$	14,381	$	39,751	$	10,888
International	96,208		93,174		71,392
Total	$	110,589	$	132,925	$	82,280

The “Income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	Current			Deferred			Total
2018
Domestic	$	(341	)	$	(3,007	)	$	(3,348	)
International	26,604			(318		)	26,286
Total	$	26,263		$	(3,325	)	$	22,938
2017
Domestic	$	7,535		$	21,936		$	29,471
International	27,418			(4,423		)	22,995
Total	$	34,953		$	17,513		$	52,466
2016
Domestic	$	2,078		$	3,376		$	5,454
International	24,537			4,006			28,543
Total	$	26,615		$	7,382		$	33,997

Deferred tax assets and liabilities as of December 31, 2018 and 2017, were comprised of the following:

(Dollars in thousands)	2018			2017
Deferred tax assets
Accrued employee benefits and compensation	$	4,269		$	8,410
Tax loss and credit carryforwards	18,604			7,905
Reserves and accruals	4,935			4,699
Other	1,953			2,977
Total deferred tax assets	29,761			23,991
Less deferred tax asset valuation allowance	(16,889		)	(8,754		)
Total deferred tax assets, net of valuation allowance	12,872			15,237
Deferred tax liabilities
Depreciation and amortization	8,335			14,300
Postretirement benefit obligations	3,234			2,311
Unremitted earnings	1,778			3,100
Other	2,094			224
Total deferred tax liabilities	15,441			19,935
Net deferred tax asset (liability)	$	(2,569	)	$	(4,698	)

As of December 31, 2018, the Company had state net operating loss carryforwards ranging from $3.7 million to $6.1 million in various state taxing jurisdictions, which expire between 2021 and 2038 and approximately $8.4 million of credit carryforwards in Arizona, which will expire between 2019 and 2033. The Company also had $8.3 million of federal research and development credit carryforwards that begin to expire in 2026. We believe that it is more likely than not that the benefit from certain of the state net operating loss, state credits and federal research and development credits carryforwards will not be realized. In recognition of this risk, we have provided a valuation allowance of $16.9 million relating to these carryforwards.

We currently have approximately $3.7 million of foreign tax credits that begin to expire in 2027 and $0.5 million of minimum tax credits that can be utilized or refunded by tax year 2021.

We had a valuation allowance of $16.9 million as of December 31, 2018 and $8.8 million as of December 31, 2017, against certain of our deferred tax assets, primarily carryforwards expected to expire unused and deferred tax assets that are capital in nature. No valuation allowance has been provided on our other deferred tax assets, as we believe it is more likely than not that all such assets will be realized in the applicable jurisdictions. We reached this conclusion after considering the availability of taxable income in prior carryback years, tax planning strategies, and the likelihood of future taxable income exclusive of reversing temporary differences and carryforwards in the respective jurisdictions or entities. Differences between forecasted and actual future operating results or changes in carryforward periods could adversely impact the amount of deferred tax asset considered realizable.

Income tax expense differs from the amount computed by applying the United States federal statutory income tax rate to income before income taxes. The reasons for this difference were as follows:

(Dollars in thousands)	2018			2017			2016
Tax expense at Federal statutory income tax rate	$	23,224		$	46,529		$	28,798
International tax rate differential	826			(9,603		)	(2,260		)
Foreign source income, net of tax credits (excluding U.S. Tax Reform)	(197		)	1,087			1,215
State tax, net of federal	121			279			(200		)
Unrecognized tax benefits	(869		)	2,874			(5,555		)
U.S. Tax Reform	209			13,683			—
Equity compensation excess tax deductions	(2,238		)	(3,867		)	—
General business credits	(2,172		)	(1,080		)	(1,125		)
Distribution related foreign taxes	1,916			2,173			12,433
Valuation allowance change (excluding U.S. Tax Reform)	602			1,393			171
Other	1,516			(1,002		)	520
Income tax expense (benefit)	$	22,938		$	52,466		$	33,997

Our effective income tax rate for 2018 was 20.7% compared to 39.5% for 2017. The 2018 rate decrease was primarily due to a lower U.S. statutory tax rate in 2018 and the absence of the one-time impact from the enactment of the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform) in 2017, an increase in reversal of reserves associated with uncertain tax positions and lower foreign tax impact on remitted and unremitted foreign earnings and profits.

The Company did not make any changes in 2018 to its position on the permanent reinvestment of its earnings from foreign operations. With the exception of certain Chinese subsidiaries, the Company continues to assert that historical foreign earnings are indefinitely reinvested. As of December 31, 2018 and 2017, the Company had recorded a deferred tax liability of $1.8 million and $3.1 million, respectively, for Chinese withholding tax on undistributed earnings that are not indefinitely reinvested. The other remaining foreign subsidiaries have both the intent and ability to indefinitely reinvest their undistributed earnings and the Company does not expect that these undistributed earnings should give rise to significant additional tax liabilities as a result of distribution of such earnings.

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and development credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities.

Unrecognized tax benefits, excluding potential interest and penalties, for the years ended December 31, 2018 and December 31, 2017, were as follows:

(Dollars in thousands)	2018			2017
Beginning balance	$	14,565		$	5,883
Gross increases - current period tax positions	2,583			7,056
Gross increases - tax positions in prior periods	505			3,243
Gross decreases - tax positions in prior periods	—			(375		)
Foreign currency exchange	(142		)	467
Lapse of statute of limitations	(7,710		)	(1,709		)
Ending balance	$	9,801		$	14,565

Included in the balance of unrecognized tax benefits as of December 31, 2018 were $9.6 million of tax benefits that, if recognized, would impact the effective tax rate. Also included in the balance of unrecognized tax benefit as of December 31, 2018 were $0.2 million of tax benefits that, if recognized, would result in adjustments to other tax accounts, primarily deferred taxes.

We recognize interest accrued related to unrecognized tax benefit as income tax expense. Related to the unrecognized tax benefits noted above, at December 31, 2018 and 2017, we had accrued potential interest and penalties of approximately $0.5 million and $0.6 million, respectively. We have recorded a net income tax benefit of $0.1 million during 2018, net income tax expense of $0.2 million during 2017 and $0.9 million net income tax benefit during 2016. It is possible that up to $1.8 million of our currently unrecognized tax benefits could be recognized within 12 months as a result of projected resolutions of worldwide tax disputes or the expiration of the statute of limitations.

We are subject to taxation in the United States and various state and foreign jurisdictions. Our tax years from 2014 through 2018 are subject to examination by the tax authorities. With few exceptions, we are no longer subject to United States federal, state, local and foreign examinations by tax authorities for the years before 2014.

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Operating Segments and Geographic Information

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Operating Segments and Geographic Information

Note 15 – Operating Segment and Geographic Information

Our reporting structure is comprised of the following strategic operating segments: ACS, EMS and PES. The remaining operations, which represent our non-core businesses, are reported in the Other operating segment. We believe this structure aligns our external reporting presentation with how we currently manage and view our business internally.

On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers. For additional information regarding the impacts of adoption of new accounting guidance for revenue recognition, refer to “Note 16 – Revenue from Contracts with Customers.” We sell products to fabricators and distributors who then sell directly into various end markets. End markets within our ACS operating segment include wireless infrastructure, aerospace and defense, automotive, connected devices, wired infrastructure and consumer electronics. End markets within our EMS operating segment include portable electronics, mass transit, automotive and consumer. End markets within our PES operating segment include e-mobility, industrial, renewable energy, mass transit and micro channel coolers. End markets in our Other operating segment include automotive and industrial.

The following table presents a disaggregation of revenue from contracts with customers and other pertinent financial information, for the periods indicated; inter-segment sales have been eliminated from the net sales data:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
2018
Net sales - recognized over time	$	—	$	5,788	$	221,896	$	16,973	$	244,657
Net sales - recognized at a point in time	$	294,154	$	335,576	$	1,442	$	3,262	$	634,434
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
Operating income	$	33,827	$	52,502	$	19,648	$	6,734	$	112,711
Total assets	$	396,075	$	588,841	$	273,212	$	21,216	$	1,279,344
Capital expenditures	$	61,425	$	10,917	$	18,051	$	156	$	90,549
Depreciation & amortization	$	20,121	$	18,501	$	10,640	$	811	$	50,073
Investment in unconsolidated joint ventures	$	—	$	18,667	$	—	$	—	$	18,667
Equity income in unconsolidated joint ventures	$	—	$	5,501	$	—	$	—	$	5,501
2017
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
Operating income	$	55,410	$	50,908	$	15,668	$	7,153	$	129,139
Total assets	$	353,786	$	489,456	$	261,034	$	20,858	$	1,125,134
Capital expenditures	$	9,900	$	7,563	$	9,238	$	514	$	27,215
Depreciation & amortization	$	16,351	$	16,270	$	10,572	$	906	$	44,099
Investment in unconsolidated joint ventures	$	—	$	18,324	$	—	$	—	$	18,324
Equity income in unconsolidated joint ventures	$	—	$	4,898	$	—	$	—	$	4,898
2016
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314
Operating income	$	42,455	$	25,884	$	5,229	$	7,329	$	80,897
Total assets	$	361,746	$	421,011	$	247,187	$	26,556	$	1,056,500
Capital expenditures	$	7,569	$	4,051	$	6,009	$	507	$	18,136
Depreciation & amortization	$	15,654	$	10,141	$	11,208	$	844	$	37,847
Investment in unconsolidated joint ventures	$	—	$	16,183	$	—	$	—	$	16,183
Equity income in unconsolidated joint ventures	$	—	$	4,146	$	—	$	—	$	4,146

The following table presents net sales by our operating segment operations by geographic area for the years indicated:

(Dollars in thousands)	Net Sales(1)
Region/Country	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
December 31, 2018
United States	$	52,661	$	152,284	$	37,325	$	4,527	$	246,797
Other Americas	3,104		14,453		931		773		19,261
Total Americas	55,765		166,737		38,256		5,300		266,058
China	136,315		101,036		39,781		4,959		282,091
Other APAC	63,318		40,788		28,414		2,892		135,412
Total APAC	199,633		141,824		68,195		7,851		417,503
Germany	18,165		9,907		62,359		584		91,015
Other EMEA	20,591		22,896		54,528		6,500		104,515
Total EMEA	38,756		32,803		116,887		7,084		195,530
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
December 31, 2017
United States	$	48,277	$	141,508	$	30,403	$	5,210	$	225,398
Other Americas	2,946		9,709		1,153		699		14,507
Total Americas	51,223		151,217		31,556		5,909		239,905
China	143,065		93,039		32,164		5,123		273,391
Other APAC	64,077		36,233		21,845		3,421		125,576
Total APAC	207,142		129,272		54,009		8,544		398,967
Germany	23,925		9,211		54,813		657		88,606
Other EMEA	18,802		22,961		44,576		7,226		93,565
Total EMEA	42,727		32,172		99,389		7,883		182,171
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
December 31, 2016
United States	$	46,951	$	61,188	$	25,599	$	5,499	$	139,237
Other Americas	2,035		7,722		313		855		10,925
Total Americas	48,986		68,910		25,912		6,354		150,162
China	137,695		77,033		20,964		5,511		241,203
Other APAC	53,082		29,109		17,751		3,898		103,840
Total APAC	190,777		106,142		38,715		9,409		345,043
Germany	19,842		7,621		53,426		849		81,738
Other EMEA	18,182		20,508		34,314		6,367		79,371
Total EMEA	38,024		28,129		87,740		7,216		161,109
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314

⁽¹⁾ Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated.

Information relating to our long-lived assets by geographic area was as follows as of December 31 for the year indicated:

	Long-Lived Assets(1)
(Dollars in thousands)	2018		2017		2016
United States	$	476,560	$	370,964	$	326,199
China	58,205		57,404		62,728
Germany	113,412		114,497		101,725
Other	36,475		34,131		32,242
Total	$	684,652	$	576,996	$	522,894

⁽¹⁾ Long-lived assets are based on the location of the asset and are comprised of goodwill, other intangible assets and property, plant and equipment. Countries with 10% of more of long-lived assets have been disclosed.

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Revenue from Contracts with Customers

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Note 16 – Revenue from Contracts with Customers

Revenue Recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, to achieve a consistent application of revenue recognition, resulting in a single revenue model to be applied by reporting companies under U.S. generally accepted accounting principles. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. In addition, the new standard requires that reporting companies disclose the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

The Company manufactures some products to customer specifications which are customized to such a degree that it is unlikely that another entity would purchase these products or that we could modify these products for another customer. These products are deemed to have no alternative use to the Company whereby we have an enforceable right to payment evidenced by contractual termination clauses. In accordance with ASC 606, for those circumstances we recognize revenue on an over-time basis. Revenue recognition does not occur until the product meets the definition of “no alternative use” and therefore, items that have not yet reached that point in the production process are not included in the population of items with over-time revenue recognition.

As appropriate, we record estimated reductions to revenue for customer returns, allowances, and warranty claims. Provisions for such reductions are made at the time of sale and are typically derived from historical trends and other relevant information.

Performance Obligations

Manufactured goods are our primary performance obligations. Revenue related to our performance obligations is predominantly recognized at a point in time consistent with our shipping terms. For certain products that meet the criteria of no alternative use whereby the Company has the right to payment, we recognize revenue on an over-time basis.

The selection of a method to measure progress toward completion of a contract requires judgment and is based on the nature of the products or services to be provided. We use the cost incurred method to measure the progress of our contracts with no alternative use products whereby the Company has the right to payment as we believe it is the best depiction of the transferring of value to the customer. Under the cost incurred method, the extent of progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the contract. Contract costs include labor, materials and subcontractors costs, as well as an allocation of indirect costs. Net sales, including estimated fees or profits, are recorded as costs are incurred.

Performance obligations are typically satisfied within three months of receipt of a customer order; therefore, a change in cost estimates will not have a material impact on the percentage of completion noted at the prior quarter end. Our typical payment terms with customers range from 30 days to 105 days. Product pricing is determined and negotiated on a standalone basis. Product pricing is determined without consideration for the pricing, margin, or other information specific to other products that the same customer or other parties related to that customer may also purchase, whether in the same or a different contract. Management allocates the transaction price to its performance obligations primarily based on stand-alone selling prices that may have been developed via specific customer quote for no alternative use products and non-standard products or standard price lists for standard products. The accounting for the estimate of variable consideration is consistent with our current practice.

Contract modifications occur when there is a change to the products, price, or both. Contract modifications are treated as a separate contract if there are additions to promised goods and services that are distinct and if the price for that separate performance obligation reflects the stand-alone selling price for those goods or services. However, if the obligations in the contract modification are not distinct and are part of a single performance obligation that is only partially satisfied, the contract is not determined to be a separate contract and is accounted for as a revision to an existing contract. These modifications are accounted for prospectively when remaining promises are distinct from those previously transferred, or through a cumulative catch-up adjustment.

Contract Balances

The Company has contract assets primarily related to unbilled revenue for revenue recognized related to products that are deemed to have no alternative use whereby we have the right to payment. Revenue is recognized in advance of billing to the customer in these circumstances as billing is typically performed at the time of shipment to the customer. The unbilled revenue is included in the contract assets on the consolidated statements of financial position.

The Company did not have any contract liabilities as of December 31, 2018.

The following table presents contract assets by operating segment as of December 31, 2018:

	December 31, 2018
(Dollars in thousands)	Advanced Connectivity Solutions	Elastomeric Material Solutions	Power Electronics Solutions	Other	Total
Contract Assets	—	943	19,738	2,047	22,728

No impairment losses were recognized during the year ended December 31, 2018 on any receivables or contract assets arising from our contracts with customers.

Transition

We adopted ASU 2014-09 in the first quarter of 2018 retrospectively with the cumulative effect of applying the standard recognized at the date of implementation and without restatement of comparative periods. This application of the new standard resulted in an increase to the January 1, 2018 balance of retained earnings of approximately $4.2 million, net of tax.

The guidance was applied to all contracts that were not completed at the date of implementation. The primary reason for the impact of adoption is due to over-time revenue recognition.

If the criteria for over-time recognition are not met, revenue is recognized at a point in time. In considering at what point in time control of the product or service has transferred to the customer, we consider qualitative factors such as: 1) present right to payment; 2) legal title to the asset; 3) physical possession; 4) risks and rewards of ownership; and, 5) customer acceptance.

The impact of adoption using the modified retrospective method on the Company’s consolidated financial statements is as follows:

	As of
Consolidated Statements of Financial Position:	December 31, 2017					January 1, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	18,099		$	18,099
Inventories	112,557		(12,307		)	100,250
Deferred income taxes	10,706		1,580			12,286
Retained earnings	684,540		4,212			688,752

The following tables set forth the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606, as compared to the guidance that was in effect before its adoption. The impact of adoption on the consolidated financial statements as of and for the year ended December 31, 2018 is as follows:

Consolidated Statements of Operations:	Year Ended
	December 31, 2018				December 31, 2018
(Dollars in thousands, except per share amounts)	Under ASC 605		Impact of Adoption		Under ASC 606
Net sales	$	874,462	$	4,629	$	879,091
Cost of sales	565,160		3,148		568,308
Income tax expense	22,558		380		22,938
Net income	86,550		1,101		87,651
Basic earnings per share	$	4.71	$	0.06	$	4.77
Diluted earnings per share	$	4.64	$	0.06	$	4.70

	As of
Consolidated Statements of Financial Position:	December 31, 2018					December 31, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	22,728		$	22,728
Inventories	148,092		(15,455		)	132,637
Deferred income taxes	8,846		1,960			10,806
Retained earnings	771,090		5,313			776,403

	Year Ended
Consolidated Statements of Cash Flows:	December 31, 2018						December 31, 2018
(Dollars in thousands)	Under ASC 605			Impact of Adoption			Under ASC 606
Cash provided by operating activities:
Net income	$	86,550		$	1,101		$	87,651
Deferred income taxes	(3,705		)	380			(3,325		)
Contract assets	—			(22,728		)	(22,728		)
Inventories	(34,468		)	15,455			(19,013		)
Other, net	(4,801		)	5,792			991
Net cash provided by operating activities	66,820			—			66,820

Practical Expedients

The Company recognizes the incremental costs of obtaining a contract as an expense when incurred as the amortization period of the asset is expected to be one year or less. The Company does not adjust the promised amount of consideration for the effects of a significant financing component as we expect, at contract inception, that the period between when the transfer of goods to our customer occurs and when the customer fully pays for the goods will be one year or less. We do not disclose the Company’s unsatisfied performance obligations as they are part of contracts that have an original expected duration of one year or less.

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Restructuring and Impairment Charges

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring and Impairment Charges

Note 17 – Restructuring and Impairment Charges

Restructuring Charges

Global Headquarters Relocation

In 2017, we completed the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona. We recorded $0.6 million, $2.8 million and $0.7 million of expense for the years ended December 31, 2018, 2017 and 2016, respectively, related to the headquarters relocation, including $0.1 million, $0.4 million and $0.6 million of severance benefits expense for the years ended December 31, 2018, 2017 and 2016, respectively. The fair value of the total severance benefits to be paid (including payments already made) in connection with the headquarter relocation was $1.1 million. The total severance costs were expensed ratably over the required service period for the affected employees.

The following table presents severance activity related to the headquarters relocation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Headquarters Relocation
Balance as of December 31, 2017	$	183
Provisions	186
Payments	(264		)
Balance as of December 31, 2018	$	105

Facility Consolidation

On April 24, 2018, we made the decision to consolidate our Santa Fe Springs, California operations into the Company’s facilities in Carol Stream, Illinois and Bear, Delaware. We recorded $2.0 million of expense for the year ended December 31, 2018 related to the facility consolidation, including $0.5 million of severance benefits expense for the year ended December 31, 2018. The fair value of the total severance benefits to be paid (including payments already made) in connection with the facility consolidation is $0.5 million. The total severance costs are being expensed ratably over the required service period for the affected employees. Additionally, we incurred $1.6 million in capital expenditures for the year ended December 31, 2018 related to the facility consolidation.

The following table presents severance activity related to the facility consolidation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Facility Consolidation
Balance as of December 31, 2017	$	—
Provisions	546
Payments	(23		)
Balance as of December 31, 2018	$	523

Impairment Charges

In 2018, we recognized $1.5 million in impairment charges on certain assets in connection with the Isola asset acquisition, which was allocated specifically to the ACS operating segment. In 2017, we recognized a $0.3 million charge related to the impairment of our remaining investment in BrightVolt, Inc. As this investment did not relate to a specific operating segment, we allocated it ratably among ACS, EMS and PES. Also in 2017, we recognized a $0.5 million impairment charge related to the remaining net book value of an other intangible asset within the ROLINX^® product line in our PES operating segment.

Allocation of Charges to Operating Segments

The following table summarizes the restructuring and impairment charges recorded in our operating results in 2018, 2017 and 2016:

(Dollars in thousands)	2018		2017		2016
Advanced Connectivity Solutions
Severance and other related costs	$	244	$	1,305	$	375
Allocated impairment charges	1,506		161		—
Elastomeric Material Solutions
Severance and other related costs	2,152		834		176
Allocated impairment charges	—		103		—
Power Electronics Solutions
Severance and other related costs	136		621		183
Allocated impairment charges	—		543		—
Total Restructuring and Impairment Charges	$	4,038	$	3,567	$	734

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Supplemental Financial Information

12 Months Ended

Dec. 31, 2018

Supplemental Income Statement Elements [Abstract]

Supplemental Financial Information

Note 18 – Supplemental Financial Information

The components of Other operating (income) expense, net are as follows:

	Year Ended December 31,
(Dollars in thousands)	2018			2017			2016
Gain from antitrust litigation settlement	$	(4,231	)	$	—		$	—
Gain on sale of property, plant and equipment	(164		)	(5,329		)	—
Lease income	(948		)	—			—
Depreciation on leased assets	3,512			—			—
Indemnity claim settlement from acquisitions	(700		)	—			—
Economic incentive grants	(556		)	—			—
	$	(3,087	)	$	(5,329	)	$	—

In 2018, we recorded a gain from the settlement of antitrust litigation in the amount of $4.2 million as a result of the settlement of a class action lawsuit, filed in 2005, which alleged that Dow Chemical Company and other urethane raw material suppliers unlawfully agreed to fix, raise, maintain or stabilize the prices of Polyether Polyol Products sold in the United States from January 1, 1999 through December 31, 2004 in violation of the federal antitrust laws. We also recorded a gain of $0.7 million for the settlement of indemnity claims related to the DSP acquisition, income of $0.6 million from economic incentive grants related to the physical relocation of our global headquarters from Rogers, Connecticut to Chandler, Arizona and a gain on sale of property, plant and equipment of $0.2 million.

In 2018, we recognized lease income of approximately $0.9 million and related depreciation expense on leased assets of approximately $3.5 million in connection with the transitional leaseback of a portion of the facility and certain machinery and equipment acquired from Isola in August 2018.

In 2017, we recognized other operating income of $5.3 million as a result of the sales of a facility and a parcel of land located in Belgium.

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Recent Accounting Standards

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Recent Accounting Standards

Note 19 – Recent Accounting Standards

Recently Issued Standards

In October 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes, which permits the use of the OIS rate based on the SOFR as a U.S. benchmark interest rate for hedge accounting purposes. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The amendments in this update will be adopted on a prospective basis and the Company does not expect this guidance to have a significant impact on our results of operations or statements of cash flows.

In August 2018, the FASB issued Accounting Standards Update ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud computing Arrangement that is a Service Contract,which aligns the requirements for capitalizing costs incurred in the implementation of a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year, with early adoption permitted. The amendments in this update may be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit plans or other postretirement plans. This ASU is effective for our fiscal year ending December 31, 2020, with early adoption permitted. ASU 2018-14 is required to be applied on a retrospective basis to all periods presented. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This ASU expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year. Early adoption is permitted. ASU 2018-13 is generally required to be applied retrospectively to all periods presented upon their effective date with the exception of certain amendments, which should be applied prospectively to the most recent interim or annual period presented in the year of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows for reclassification of stranded tax effects resulting from U.S. Tax Reform from accumulated other comprehensive loss to retained earnings but it does not require this reclassification. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this ASU in the first quarter of 2019 and will not elect to reclassify the stranded tax effects resulting from U.S. Tax Reform. As a result of that election, the adoption of ASU 2018-02 will not have an impact on the Company’s consolidated financial statements and disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to classify leases as either finance or operating leases and record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. An accounting policy election may be made to account for leases with a term of 12 months or less similar to existing guidance for operating leases today. ASU No. 2016-02 supersedes the existing guidance on accounting for leases. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which allows for an optional transition method for the adoption of Topic 842. The two permitted transition methods are now the modified retrospective approach, which applies the new lease requirements at the beginning of the earliest period presented, and the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02 is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this standard in the first quarter of 2019 using the optional transition method. The Company also intends to elect the practical expedients that allows us to carry forward the historical lease classification. The Company has established an inventory of existing leases and implemented a new process of evaluating the classification of each lease. The financial impact of the adoption of the new standard is estimated to increase total assets and total liabilities by approximately $9.0 million to $11.0 million, as of January 1, 2019.  The financial impact of the adoption primarily relates to the capitalization of right-of-use assets related to operating leases. The Company has implemented changes to its processes and internal controls, as necessary, to meet the reporting and disclosure requirements of the new standard.

Recently Adopted Standards Reflected in Our 2018 Financial Statements

In March 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740):Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. This ASU adds guidance that answers questions regarding how certain income tax effects from the U.S. Tax Reform should be applied to companies’ financial statements. The guidance also lists which financial statement disclosures are required under a measurement period approach.

In January 2018, the FASB released guidance on the accounting for tax on the Global Intangible Low Tax Income (GILTI) provisions of U.S. Tax Reform. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that accounting for deferred taxes related to GILTI inclusions or treating any taxes on GILTI inclusions as period costs are both acceptable methods subject to an accounting policy election. This guidance was effective for our first quarter of 2018 and the Company elected to treat any potential GILTI inclusions as a period cost.

In December 2017, SAB 118 was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of U.S. Tax Reform. In accordance with SAB 118, the company recorded provisional estimates for the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and tax expense associated with the mandatory deemed repatriation of foreign earnings at December 31, 2017. The Company completed the analysis of the impact of U.S. Tax Reform during 2018 and recorded an additional tax expense of $0.2 million for the year ended December 31, 2018.

In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The Company adopted this standard on January 1, 2018, which did not have a material effect on the consolidated financial statements. Adoption of this standard was applied prospectively to awards modified on or after the adoption date.

In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. The changes to the standard require employers to report the service cost component in the same line item as other compensation costs arising from services rendered by employees during the reporting period. The other components of net periodic pension benefit costs are now being presented in the statement of operations separately from the service cost and outside of a subtotal of operating income from operations. In addition, only the service cost component may be eligible for capitalization, where applicable. The Company adopted this standard on January 1, 2018. In conjunction with the adoption of this guidance, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from“Selling, general and administrative expenses” to “Other income (expense), net” for the years endedDecember 31, 2017and2016.

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Quarterly Results of Operations (Unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Results of Operations (Unaudited)

Note 20 – Quarterly Results of Operations (Unaudited)

	2018
(Dollars in thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	214,611	$	214,675	$	226,863	$	222,942
Gross margin	$	76,606	$	76,672	$	79,130	$	78,375
Net income	$	26,136	$	17,329	$	19,734	$	24,452
Net income per share:
Basic	$	1.43	$	0.94	$	1.07	$	1.33
Diluted	$	1.40	$	0.93	$	1.06	$	1.31

(Dollars in thousands, except per share amounts)	2017
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	203,828	$	201,424	$	206,783	$	209,008
Gross margin	$	80,350	$	80,546	$	82,188	$	75,491
Net income	$	27,032	$	20,896	$	25,532	$	6,999
Net income per share:
Basic	$	1.50	$	1.15	$	1.40	$	0.38
Diluted	$	1.47	$	1.13	$	1.37	$	0.37

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Share Repurchases

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Share Repurchases

Note 21 – Share Repurchases

In 2015, we initiated a share repurchase program (the Program) of up to $100.0 million of the Company’s capital stock. We initiated the Program to mitigate potentially dilutive effects of stock options and shares of restricted stock granted by the Company, in addition to enhancing shareholder value. The share repurchase program has no expiration date, and may be suspended or discontinued at any time without notice. As of December 31, 2018, $49.0 million remained of our $100.0 million share repurchase program.

We repurchased the following shares of capital stock through the Program, using cash from operations and cash on hand, during the years presented below:

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017
Shares of capital stock repurchased	23,138		—
Value of capital stock repurchased	$	2,999	$	—

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SCHEDULE II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II Valuation and Qualifying Accounts

Valuation and Qualifying Accounts

(Dollars in thousands)	Balance at Beginning of Period		Charged to (Reduction of) Costs and Expenses			Taken Against Allowance			Other (Deductions) Recoveries		Balance at End of Period
Allowance for Doubtful Accounts
December 31, 2018	$	1,525	$	189		$	(360	)	$	—	$	1,354
December 31, 2017	$	1,952	$	(275	)	$	(152	)	$	—	$	1,525
December 31, 2016	$	695	$	1,321		$	(64	)	$	—	$	1,952

(Dollars in thousands)	Balance at Beginning of Period		Charged to (Reduction of) Costs and Expenses		Taken Against Allowance		Other (Deductions) Recoveries		Balance at End of Period
Valuation on Allowance for Deferred Tax Assets
December 31, 2018	$	8,754	$	8,135	$	—	$	—	$	16,889
December 31, 2017	$	6,388	$	2,366	$	—	$	—	$	8,754
December 31, 2016	$	6,202	$	186	$	—	$	—	$	6,388

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Organization and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and our wholly-owned subsidiaries, after elimination of inter-company accounts and transactions. The preparation of financial statements, in conformity with accounting principles generally accepted in the United States (U.S. GAAP), requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

Reclassification

Reclassification

On January 1, 2018, the Company adopted ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. Upon adoption, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from “Selling, general and administrative expenses” to “Other income (expense), net” for the years ended December 31, 2017 and 2016, respectively. Refer to “Note 19 – Recent Accounting Standards” for further information.

Organization

Organization

Our reporting structure is comprised of three strategic operating segments: Advanced Connectivity Solutions (ACS), Elastomeric Material Solutions (EMS) and Power Electronics Solutions (PES). The remaining operations are accumulated and reported as our Other operating segment.

Advanced Connectivity Solutions

Our ACS operating segment designs, develops, manufactures and sells circuit materials and solutions enabling high-performance and high-reliability connectivity for applications in wireless infrastructure (e.g., power amplifiers, antennas, small cells and distributed antenna systems), automotive (e.g., active safety, advanced driver assistance systems, telematics and thermal management), aerospace and defense, connected devices (e.g., mobile internet devices and Internet of Things), wired infrastructure (e.g., computing and IP infrastructure) and consumer electronics. We believe these products have characteristics that offer performance and other functional advantages in many market applications that serve to differentiate our products from other commonly available materials. These products are sold principally to independent and captive printed circuit board fabricators that convert our laminates to custom printed circuits. Trade names for our ACS products include: RO3000^®, RO4000^®, RT/duroid^®, TMM^®, AD Series^TM and CLTE Series^TM. As of December 31, 2018, our ACS operating segment had manufacturing and administrative facilities in Chandler, Arizona; Rogers, Connecticut; Bear, Delaware; Evergem, Belgium; and Suzhou, China.

Elastomeric Material Solutions

Our EMS operating segment designs, develops, manufactures and sells engineered material solutions for a wide variety of applications and end markets. These include polyurethane and silicone materials used in critical cushioning, sealing and vibration management applications for portable electronics (e.g., smart phones), automotive, aerospace, rail, footwear and printing end markets; customized silicones used in flex heater and semiconductor thermal applications; polytetrafluoroethylene and ultra-high molecular weight polyethylene materials used in wire and cable, pressure-sensitive tapes and automotive applications. We believe these materials have characteristics that offer functional advantages in many market applications which serve to differentiate Rogers’ products from other commonly available materials. EMS products are sold globally to converters, fabricators, distributors and original equipment manufacturers (OEMs). Trade names for our EMS products include: PORON^®, BISCO^®, DeWAL^®, ARLON^®, DSP^®, Griswold^®, eSORBA^®, XRD^®, HeatSORB™ and R/bak^®.

In July 2018, we acquired Griswold LLC (Griswold), a manufacturer of a wide range of high-performance engineered cellular elastomer and microcellular polyurethane products and solutions. In January 2017, we acquired the principal operating assets of Diversified Silicone Products, Inc. (DSP), a custom silicone product development and manufacturing business, serving a wide range of high reliability applications, and in November 2016, we acquired DeWAL Industries LLC (DeWAL), a manufacturer of polytetrafluoroethylene and ultra-high molecular weight polyethylene films, pressure sensitive tapes and specialty products for the industrial, aerospace, automotive, and electronics markets. The acquisitions of Griswold, DSP and DeWAL, and their subsequent integration into our EMS operating segment, have enabled us to increase scale and complement our existing product offerings, thus enhancing our ability to support our customers.

As of December 31, 2018, our EMS operating segment had administrative and manufacturing facilities in Moosup, Connecticut; Rogers, Connecticut; Woodstock, Connecticut; Bear, Delaware; Carol Stream, Illinois; Narragansett, Rhode Island; Santa Fe Springs, California; Ansan, South Korea; and Suzhou, China. We also own 50% of: (1) Rogers Inoac Corporation (RIC), a joint venture established in Japan to design, develop, manufacture and sell PORON products predominantly for the Japanese market and (2) Rogers INOAC Suzhou Corporation (RIS), a joint venture established in China to design, develop, manufacture and sell PORON products primarily for RIC customers in various Asian countries. INOAC Corporation owns the remaining 50% of both RIC and RIS. RIC has manufacturing facilities at the INOAC facilities in Nagoya and Mie, Japan, and RIS has manufacturing facilities at Rogers’ facilities in Suzhou, China.

Power Electronics Solutions

Our PES operating segment designs, develops, manufactures and sells ceramic substrate materials for power module applications (e.g., variable frequency drives, vehicle electrification and renewable energy), laminated busbars for power inverter and high power interconnect applications (e.g., mass transit, hybrid-electric and electric vehicles, renewable energy and variable frequency drives) and micro-channel coolers (e.g., laser cutting equipment). We sell our ceramic substrate materials and micro channel coolers under the curamik^® trade name, and our busbars under the ROLINX^® trade name. As of December 31, 2018, our PES operating segment had manufacturing and administrative facilities in Evergem, Belgium; Eschenbach, Germany; Budapest, Hungary; and Suzhou, China.

Other

Our Other operating segment consists of elastomer components for applications in ground transportation, office equipment, consumer and other markets; elastomer floats for level sensing in fuel tanks, motors, and storage tanks; and inverters for portable communications and automotive markets. Trade names for our elastomer components include: NITROPHYL^® floats for level sensing in fuel tanks, motors, and storage tanks and ENDUR^® elastomer rollers.

Cash Equivalents

Cash Equivalents

Highly liquid investments with original maturities of three months or less are considered cash equivalents. These investments are stated at cost, which approximates fair value.

Investments in Unconsolidated Joint Ventures

Investments in Unconsolidated Joint Ventures

We account for our investments in and advances to unconsolidated joint ventures, both of which are 50% owned, using the equity method of accounting.

Foreign Currency

Foreign Currency

All balance sheet accounts of foreign subsidiaries are translated or remeasured at exchange rates in effect at each year end, and income statement items are translated using the average exchange rates for the year. Translation adjustments for those entities that operate under a local currency are recorded directly to a separate component of shareholders’ equity, while remeasurement adjustments for those entities that operate under the parent’s functional currency are recorded to the income statement as a component of “Other income (expense), net.” Currency transaction gains and losses are reported as income or expense, respectively, in the consolidated statements of operations as a component of “Other income (expense), net.

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts

The allowance for doubtful accounts is determined based on a variety of factors that affect the potential collectability of the related receivables, including the length of time receivables are past due, customer credit ratings, financial stability of customers, specific one-time events and past customer history. In addition, in circumstances where we are made aware of a specific customer’s inability to meet its financial obligations, a specific allowance is established. The majority of accounts are individually evaluated on a regular basis and appropriate reserves are established as deemed appropriate based on the criteria previously mentioned. The remainder of the reserve is based on our estimates and takes into consideration historical trends, market conditions and the composition of our customer base.

Inventories

Inventories

Inventories are stated at the lower of cost or net realizable value. The cost of inventories is determined using the first in, first out (FIFO) method. An allowance is made for estimated losses due to obsolescence. The allowance is determined for groups of products based on purchases in the recent past and/or expected future demand and market conditions. Abnormal amounts of idle facility expense and waste are not capitalized in inventory. The allocation of fixed production overheads to the inventory cost is based on the normal capacity of the production facilities.

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are stated on the basis of cost. For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

Software Costs

Software Costs

We capitalize certain computer software and software development costs incurred in connection with developing or obtaining computer software for internal use when both the preliminary project stage is completed and it is probable that the software will be used as intended. Capitalized software costs include only (i) external direct costs of materials and services utilized in developing or obtaining computer software, and (ii) compensation and related benefits for employees who are directly associated with the software project. Capitalized software costs are amortized on a straight-line basis when placed into service over the estimated useful lives of the software, which approximates three to five years. Net capitalized software and development costs were $1.7 million and $4.7 million for the years ended December 31, 2018 and 2017, respectively. Capitalized software is included within “Property, plant and equipment, net of accumulated depreciation” in the consolidated statements of financial position.

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

We have made acquisitions over the years that included the recognition of intangible assets. Intangible assets are classified into three categories: (1) goodwill; (2) other intangible assets with definite lives subject to amortization; and (3) other intangible assets with indefinite lives not subject to amortization. Other intangible assets can include items such as trademarks and trade names, licensed technology, customer relationships and covenants not to compete, among other things. Each definite-lived other intangible asset is amortized over its respective economic useful life using the economic attribution method.

Goodwill is tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that our goodwill is impaired, then we compare the estimated fair value of each of our reporting units to their respective carrying value. If a reporting unit’s carrying value is greater than its fair value, then an impairment is recognized for the excess and charged to operations. We currently have four reporting units with goodwill: ACS, EMS, curamik^® and Elastomer Components Division (ECD). Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018.

The application of the annual goodwill impairment test requires significant judgment, including the identification of reporting units, assignment of assets and liabilities to reporting units and determination of the fair value of each reporting unit. Determining the fair value is subjective and requires the use of significant estimates and assumptions, including financial projections for net sales, gross margin and operating margin, discount rates, terminal year growth rates and future market conditions, among others. We estimated the fair value of our reporting units using an income approach based on the present value of future cash flows through a five year discounted cash flow analysis. The discounted cash flow analysis utilized the discount rates for each of the reporting units ranging from 11.25% for EMS to 12.90% for ECD, and terminal year growth rates ranging from 4.9% for curamik^® to 5.9% for ACS. We believe this approach yields the most appropriate evidence of fair value as our reporting units are not easily compared to other corporations involved in similar businesses. We further believe that the assumptions and rates used in our annual goodwill impairment test are reasonable, but inherently uncertain. There were no impairment charges resulting from our goodwill impairment analysis for the year ended December 31, 2018. Our ACS, EMS, curamik^® and ECD reporting units had allocated goodwill of approximately $51.7 million, $142.6 million, $68.4 million and $2.2 million respectively, as of December 31, 2018.

Indefinite-lived other intangible assets are tested for impairment annually and between annual impairment tests if events or changes in circumstances indicate the carrying value may be impaired. If it is more likely than not that an indefinite-lived other intangible asset is impaired, then we compare the estimated fair value of that indefinite-lived other intangible asset to its respective carrying value. If an indefinite-lived other intangible asset’s carrying value is greater than its fair value, then an impairment charge is recognized for the excess and charged to operations. Consistent with historical practice, the annual impairment test on these reporting units was performed as of November 30, 2018. The application of the annual indefinite-lived other intangible asset impairment test requires significant judgment, including the determination of fair value of each indefinite-lived other intangible asset. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our indefinite-lived other intangible assets impairment analysis for the year ended December 31, 2018. The curamik^® reporting unit had an indefinite-lived other intangible asset of approximately $4.5 million as of December 31, 2018.

Definite-lived other intangible assets are tested for recoverability whenever events or changes in circumstances indicate the carrying value may not be recoverable. The recoverability test involves comparing the estimated sum of the undiscounted cash flows for each definite-lived other intangible asset to its respective carrying value. If a definite-lived other intangible asset’s carrying value is greater than the sum of its undiscounted cash flows, then the definite-lived other intangible asset’s carrying value is compared to its estimated fair value and an impairment charge is recognized for the excess and charged to operations. The application of the recoverability test requires significant judgment, including the identification of the asset group and determination of undiscounted cash flows and fair value of the underlying definite-lived other intangible asset. Determination of undiscounted cash flows requires the use of significant estimates and assumptions, including certain financial projections. Fair value is primarily based on income approaches using discounted cash flow models, which have significant assumptions. Such assumptions are subject to variability from year to year and are directly impacted by global market conditions. There were no impairment charges resulting from our definite-lived other intangible assets impairment analysis for the year ended December 31, 2018. Our ACS, EMS and curamik^® reporting units had definite-lived other intangible assets of approximately $7.9 million, $152.2 million and $12.4 million, respectively, as of December 31, 2018.

Environmental and Product Liabilities

Environmental and Product Liabilities

We accrue for our environmental investigation, remediation, operating and maintenance costs when it is probable that a liability has been incurred and the amount can be reasonably estimated. For environmental matters, the most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. For sites with multiple potential responsible parties (PRPs), we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. When no amount within a range of estimates is more likely to occur than another, we accrue to the low end of the range and disclose the range. When future liabilities are determined to be reimbursable by insurance coverage, an accrual is recorded for the potential liability and a receivable is recorded for the estimated insurance reimbursement amount. We are exposed to the uncertain nature inherent in such remediation and the possibility that initial estimates will not reflect the final outcome of a matter.

We review our asbestos-related projections annually in the fourth quarter of each year unless facts and circumstances materially change during the year, at which time we would analyze these projections. We believe the assumptions made on the potential exposure and expected insurance coverage are reasonable at the present time, but are subject to uncertainty based on the actual future outcome of our asbestos litigation. Our estimates of asbestos-related contingent liabilities and related insurance receivables are based on an independent actuarial analysis and an independent insurance usage analysis prepared annually by third parties. The actuarial analysis contains numerous assumptions, including number of claims that might be received, the type and severity of the disease alleged by each claimant, the long latency period associated with asbestos exposure, dismissal rates, average settlement costs, average defense costs, costs of medical treatment, the financial resources of other companies that are co-defendants in claims, uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, and the impact of potential changes in legislative or judicial standards, including potential tort reform. Furthermore, any predictions with respect to these assumptions are subject to even greater uncertainty as the projection period lengthens. The insurance usage analysis considers, among other things, applicable deductibles, retentions and policy limits, the solvency and historical payment experience of various insurance carriers, the likelihood of recovery as estimated by external legal counsel and existing insurance settlements.

We believe the assumptions used in our models for determining our potential exposure and related insurance coverage are reasonable at the present time, but such assumptions are inherently uncertain. Given the inherent uncertainty in making projections, we plan to re-examine periodically the assumptions used in the projections of current and future asbestos claims, and we will update them if needed based on our experience, changes in the assumptions underlying our models, and other relevant factors, such as changes in the tort system. There can be no assurance that our accrued asbestos liabilities will approximate our actual asbestos-related settlement and defense costs, or that our accrued insurance recoveries will be realized. We believe that it is reasonably possible that we may incur additional charges for our asbestos liabilities and defense costs in the future, that could exceed existing reserves and insurance recovery. We plan to continue to vigorously defend ourselves and believe we have unutilized insurance coverage to mitigate future costs related to this matter.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Management believes that the carrying values of financial instruments, including cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities approximate fair value based on the maturities of these instruments. The fair value of our borrowings under credit facility are determined using discounted cash flows based upon our estimated current interest cost for similar type borrowings or current market value, which falls under Level 2 of the fair value hierarchy. Based on our credit characteristics as of December 31, 2018, borrowings would generally bear interest at LIBOR plus 150.0 basis points. As the current borrowings under our Third Amended Credit Agreement bear interest at adjusted 1-month LIBOR plus 150.0 basis points, we believe the carrying value of our borrowings approximates fair value. For additional information on the calculation of fair value measurements, refer to “Note 2 – Fair Value Measurements.”

Hedging Activity

Hedging Transactions and Derivative Financial Instruments

From time to time, we use derivative instruments to manage commodity, interest rate and foreign currency exposures. Derivative instruments are viewed as risk management tools and are not used for trading or speculative purposes. To qualify for hedge accounting treatment, derivatives used for hedging purposes must be designated and deemed effective as a hedge of the identified underlying risk exposure at the inception of the contract. Accordingly, changes in fair value of the derivative contract must be highly correlated with changes in the fair value of the underlying hedged item at inception of the hedge and over the life of the hedge contract.

Derivatives used to hedge forecasted cash flows associated with interest rates, foreign currency commitments, or forecasted commodity purchases are accounted for as cash flow hedges. For those derivative instruments that qualify for hedge accounting treatment, if the hedge is highly effective, all changes in the fair value of the derivative hedging instrument are recorded in other comprehensive income (loss). The derivative hedging instrument will be reclassified to earnings when the hedged item impacts earnings. For those derivative instruments that do not qualify for hedge accounting treatment, any related gains and losses are recognized in the consolidated statements of operations as a component of “Other income (expense), net.”

Concentration of Credit and Investment Risk

Concentration of Credit and Investment Risk

We extend credit on an uncollateralized basis to almost all customers. Concentration of credit and geographic risk with respect to accounts receivable is limited due to the large number and general dispersion of accounts that constitute our customer base. We routinely perform credit evaluations on our customers. As of December 31, 2018 and 2017, there were no customers that individually accounted for more than 10% of total accounts receivable. We have purchased credit insurance coverage for certain accounts receivable. We did not experience significant credit losses on customers’ accounts in 2018, 2017 or 2016.

We are subject to credit and market risk by using derivative instruments. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value of the derivative instrument. We seek to minimize counterparty credit (or repayment) risk by entering into derivative transactions with major financial institutions with investment grade credit ratings.

We invest excess cash principally in investment grade government securities and time deposits. We have established guidelines relative to diversification and maturities in order to maintain safety and liquidity. These guidelines are periodically reviewed and modified to reflect changes in market conditions.

Income Taxes

Income Taxes

We are subject to income taxes in the United States and in numerous foreign jurisdictions. The Company accounts for income taxes following Accounting Standards Codification (ASC) 740, Income Taxes, recognizing deferred tax assets and liabilities using enacted tax rates for the effect of temporary differences between book and tax basis of recorded assets and liabilities. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some or all of a deferred tax asset will not be realized.

As a result of the Tax Cuts and Jobs Act of 2017 (U.S. Tax Reform), all post-1986 undistributed foreign subsidiary earnings and profits as of December 31, 2018 have been subjected to U.S. tax through the transition tax. Our unremitted foreign earnings could be subject to additional income taxes if they are redeployed outside of their country of origin. The Company did not make any changes in 2018 to its position on the permanent reinvestment of its historical earnings from foreign operations. With the exception of certain Chinese subsidiaries, the Company continues to assert that historical foreign earnings are indefinitely reinvested. As of December 31, 2018 and 2017, the Company had recorded a deferred tax liability of $1.8 million and $3.1 million, respectively, for Chinese withholding tax on undistributed earnings that are not indefinitely reinvested. The other remaining foreign subsidiaries have both the intent and ability to indefinitely reinvest their undistributed earnings and the Company does not expect that these undistributed earnings should give rise to significant additional tax liabilities as a result of such earnings. For additional information regarding U.S. Tax Reform, refer to “Note 14 – Income Taxes.”

On December 22, 2017, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Reform. December 22, 2018 marked the end of the measurement period for purposes of SAB 118. As such, we have completed our analysis based on currently available legislative updates relating to the U.S. Tax Reform, as well as a more detailed analysis of the post-1986 undistributed earnings and profits that required further adjustment, resulting in a tax expense of $0.2 million in the fourth quarter of 2018 and a total tax expense of $0.2 million for the year ended December 31, 2018. The total tax expense included a $7.5 million benefit related to adjustments to the transition tax and a $7.7 million expense related to the establishment of a valuation allowance against deferred tax assets associated with carried over research and development credits. There were no significant adjustments recorded with respect to finalization of the impact of the U.S. Tax Reform on state taxes and the remeasurement of certain deferred tax assets and liabilities.

U.S. Tax Reform includes two new U.S. tax base erosion provisions, the Global Intangible Low-Taxed Income (GILTI) provisions and the Base Erosion and Anti-Abuse Tax (BEAT) provisions. The GILTI provisions require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary's tangible assets. The Company has elected to account for GILTI tax in the period in which it is incurred, and therefore has not provided any deferred tax impacts of GILTI in its consolidated financial statements for the year ended December 31, 2018. The BEAT provisions eliminate the deduction of certain base-erosion payments made to related foreign corporations, and impose a minimum tax if greater than regular tax. Starting January 1, 2018, the Company has accounted for BEAT in the period in which it is incurred to the extent the Company is subject to it. We have determined that our base erosion payments do not exceed the threshold for applicability for the year ended December 31, 2018 and we do not currently anticipate any significant long-term impact from the BEAT on our effective tax rate in future periods.

We record benefits for uncertain tax positions based on an assessment of whether it is more likely than not that the tax positions will be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain position is recognized. If the threshold is met, we recognize the largest amount of the tax benefit that is greater than fifty percent likely to be realized upon ultimate settlement.

We recognize interest and penalties within the “Income tax expense” line item in the consolidated statements of operations. Accrued interest and penalties are included within the related tax liability line item in the consolidated statements of financial position.

Revenue Recognition

Revenue Recognition

Recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the providing entity expects to be entitled in exchange for those goods or services. We recognize revenue when all of the following criteria are met: (1) we have entered into a binding agreement, (2) the performance obligations have been identified, (3) the transaction price to the customer has been determined, (4) the transaction price has been allocated to the performance obligations in the contract, and (5) the performance obligations have been satisfied. The majority of our shipping terms permit us to recognize revenue at point of shipment. Some shipping terms require the goods to be through customs or be received by the customer before title passes. In those instances, revenue is not recognized until either the customer has received the goods or they have passed through customs, depending on the circumstances. Shipping and handling costs are treated as fulfillment costs. Sales tax or VAT are excluded from the measurement of the transaction price.

Pension and Other Postretirement Benefits

Pension and Other Postretirement Benefits

We provide various defined benefit pension plans for our U.S. employees and we sponsor multiple fully insured or self-funded medical plans and fully insured life insurance plans for retirees. In 2013, the defined benefit pension plans were frozen, so that future benefits no longer accrue. The costs and obligations associated with these plans are dependent upon various actuarial assumptions used in calculating such amounts. These assumptions include discount rates, long-term rate of return on plan assets, mortality rates, and other factors. The assumptions used in these models are determined as follows: (i) the discount rate used is based on the PruCurve index; (ii) the long-term rate of return on plan assets is determined based on historical portfolio results, market results and our expectations of future returns, as well as current market assumptions related to long-term return rates; and (iii) the mortality rate is based on a mortality projection that estimates current longevity rates and their impact on the long-term plan obligations. We review these assumptions periodically throughout the year and update as necessary.

Advertising Cost

Advertising Costs

Advertising costs are expensed as incurred

Earnings Per Share

Earnings Per Share

Basic earnings per share is based on the weighted average number of common shares outstanding. Diluted earnings per share is based on the weighted average number of common shares outstanding and all dilutive potential common shares outstanding.

Equity Compensation

Equity Compensation

Equity compensation mainly consists of expense related to restricted stock units and deferred stock units.

Performance-based restricted stock unit compensation expense is based on achievement of both market and service conditions. The fair value of these awards is determined based on a Monte Carlo simulation valuation model on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period with no changes for final projected payout of the awards.

Time-based restricted stock units compensation expense is based on the achievement of only service conditions. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. We recognize compensation expense on all of these awards on a straight-line basis over the vesting period.

Deferred stock units, which are granted to non-management directors, are fully vested on the date of grant and the related shares are generally issued on the 13-month anniversary of the grant date unless the individual elects to defer the receipt of those shares. The fair value of these awards is determined based on the market value of the underlying stock price on the grant date. The compensation related to these grants is expensed immediately on the date of grant.

Recent Accounting Standards

Recently Issued Standards

In October 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes, which permits the use of the OIS rate based on the SOFR as a U.S. benchmark interest rate for hedge accounting purposes. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The amendments in this update will be adopted on a prospective basis and the Company does not expect this guidance to have a significant impact on our results of operations or statements of cash flows.

In August 2018, the FASB issued Accounting Standards Update ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud computing Arrangement that is a Service Contract,which aligns the requirements for capitalizing costs incurred in the implementation of a hosting arrangement that is a service contract with the requirements for capitalizing costs incurred to develop or obtain internal use software. This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year, with early adoption permitted. The amendments in this update may be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-14, Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans, which modifies the disclosure requirements for employers that sponsor defined benefit plans or other postretirement plans. This ASU is effective for our fiscal year ending December 31, 2020, with early adoption permitted. ASU 2018-14 is required to be applied on a retrospective basis to all periods presented. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This ASU expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This ASU is effective for our fiscal year ending December 31, 2020 and for the interim periods within that year. Early adoption is permitted. ASU 2018-13 is generally required to be applied retrospectively to all periods presented upon their effective date with the exception of certain amendments, which should be applied prospectively to the most recent interim or annual period presented in the year of adoption. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows for reclassification of stranded tax effects resulting from U.S. Tax Reform from accumulated other comprehensive loss to retained earnings but it does not require this reclassification. This ASU is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this ASU in the first quarter of 2019 and will not elect to reclassify the stranded tax effects resulting from U.S. Tax Reform. As a result of that election, the adoption of ASU 2018-02 will not have an impact on the Company’s consolidated financial statements and disclosures.

In February 2016, the FASB issued ASU No. 2016-02, Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to classify leases as either finance or operating leases and record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. An accounting policy election may be made to account for leases with a term of 12 months or less similar to existing guidance for operating leases today. ASU No. 2016-02 supersedes the existing guidance on accounting for leases. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, which allows for an optional transition method for the adoption of Topic 842. The two permitted transition methods are now the modified retrospective approach, which applies the new lease requirements at the beginning of the earliest period presented, and the optional transition method, which applies the new lease requirements through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2016-02 is effective for our fiscal year ending December 31, 2019 and the interim periods within that year. The Company will adopt this standard in the first quarter of 2019 using the optional transition method. The Company also intends to elect the practical expedients that allows us to carry forward the historical lease classification. The Company has established an inventory of existing leases and implemented a new process of evaluating the classification of each lease. The financial impact of the adoption of the new standard is estimated to increase total assets and total liabilities by approximately $9.0 million to $11.0 million, as of January 1, 2019.  The financial impact of the adoption primarily relates to the capitalization of right-of-use assets related to operating leases. The Company has implemented changes to its processes and internal controls, as necessary, to meet the reporting and disclosure requirements of the new standard.

Recently Adopted Standards Reflected in Our 2018 Financial Statements

In March 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740):Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118. This ASU adds guidance that answers questions regarding how certain income tax effects from the U.S. Tax Reform should be applied to companies’ financial statements. The guidance also lists which financial statement disclosures are required under a measurement period approach.

In January 2018, the FASB released guidance on the accounting for tax on the Global Intangible Low Tax Income (GILTI) provisions of U.S. Tax Reform. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that accounting for deferred taxes related to GILTI inclusions or treating any taxes on GILTI inclusions as period costs are both acceptable methods subject to an accounting policy election. This guidance was effective for our first quarter of 2018 and the Company elected to treat any potential GILTI inclusions as a period cost.

In December 2017, SAB 118 was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of U.S. Tax Reform. In accordance with SAB 118, the company recorded provisional estimates for the deferred tax expense recorded in connection with the remeasurement of certain deferred tax assets and tax expense associated with the mandatory deemed repatriation of foreign earnings at December 31, 2017. The Company completed the analysis of the impact of U.S. Tax Reform during 2018 and recorded an additional tax expense of $0.2 million for the year ended December 31, 2018.

In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU clarifies which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The Company adopted this standard on January 1, 2018, which did not have a material effect on the consolidated financial statements. Adoption of this standard was applied prospectively to awards modified on or after the adoption date.

In March 2017, the FASB issued ASU No. 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost. The changes to the standard require employers to report the service cost component in the same line item as other compensation costs arising from services rendered by employees during the reporting period. The other components of net periodic pension benefit costs are now being presented in the statement of operations separately from the service cost and outside of a subtotal of operating income from operations. In addition, only the service cost component may be eligible for capitalization, where applicable. The Company adopted this standard on January 1, 2018. In conjunction with the adoption of this guidance, the Company reclassified $1.6 million and $3.0 million in net periodic pension benefits from“Selling, general and administrative expenses” to “Other income (expense), net” for the years endedDecember 31, 2017and2016.

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Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of inventory

Inventories consisted of the following:

	As of December 31,
(Dollars in thousands)	2018		2017
Raw materials	$	59,321	$	43,092
Work-in-process	30,086		28,133
Finished goods	43,230		41,332
Total inventories	$	132,637	$	112,557

Schedule of property, plant and equipment, estimated useful lives

For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

	As of December 31,
(Dollars in thousands)	2018			2017
Land	$	21,525		$	14,620
Buildings and improvements	175,279			135,191
Machinery and equipment	256,301			238,000
Office equipment	64,886			56,554
Property plant and equipment, gross	517,991			444,365
Accumulated depreciation	(317,414		)	(289,909		)
Property, plant and equipment, net	200,577			154,456
Equipment in process	42,182			25,155
Total property, plant and equipment, net	$	242,759		$	179,611

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation

Derivative instruments measured at fair value on a recurring basis, categorized by the level of inputs used in the valuation, include:

	Derivative Instruments at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Foreign currency contracts	$	—	$	522	$	—	$	522
Copper derivative contracts	$	—	$	583	$	—	$	583
Interest rate swap	$	—	$	461	$	—	$	461

	Derivative Instruments at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2			Level 3		Total
Foreign currency contracts	$	—	$	(396	)	$	—	$	(396	)
Copper derivative contracts	$	—	$	2,016		$	—	$	2,016
Interest rate swap	$	—	$	41		$	—	$	41

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Hedging Transactions and Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional values of outstanding derivative positions

As of December 31, 2018, the volume of our copper contracts outstanding were as follows:

Volume of Copper Derivatives
January 2019 - March 2019	189 metric tons per month
April 2019 - June 2019	188 metric tons per month
July 2019 - September 2019	191 metric tons per month
October 2019 - December 2019	195 metric tons per month
January 2020 - March 2020	202 metric tons per month

As of December 31, 2018 the notional values of these foreign currency forward contracts were as follows:

Notional Values of Foreign Currency Derivatives
KRW/USD	₩	1,325,760,000
JPY/EUR	¥	675,000,000
EUR/USD	€	10,449,335
USD/CNY	$	23,655,942

Gain (loss) on derivative instruments

Effects on Financial Statements

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2018			Fair Values of Derivative Instruments as of December 31, 2018
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(333	)	$	522
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	(2,101	)	$	583
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	420		$	461

		The Effect of Current Derivative Instruments on the Financial Statements for the period ended December 31, 2017			Fair Values of Derivative Instruments as of December 31, 2017
(Dollars in thousands)	Location	Gain (Loss)			Other Assets/ (Other Liabilities)(1)
Foreign Exchange Contracts
Contracts not designated as hedging instruments	Other income (expense), net	$	(7	)	$	(396	)
Copper Derivatives
Contracts not designated as hedging instruments	Other income (expense), net	$	1,928		$	2,016
Interest Rate Swap
Contract designated as hedging instrument	Other comprehensive income (loss)	$	41		$	41

⁽¹⁾ All balances were recorded in the “Other current assets” or “Other accrued liabilities” line items in the consolidated statements of financial position, except the 2018 interest rate swap balance, which was recorded in the “Other long-term assets” line item in the consolidated statements of financial position.

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Accumulated balances related to each component of accumulated other comprehensive income (loss)

The changes in accumulated other comprehensive loss by component for the years ended December 31, 2018 and 2017 were as follows:

(Dollars and accompanying footnotes in thousands)	Foreign Currency Translation Adjustments			Pension and Other Postretirement Benefits(1)			Derivative Instrument Designated as Cash Flow Hedge(2)			Total
Balance as of December 31, 2016	$	(46,446	)	$	(45,816	)	$	—		$	(92,262	)
Other comprehensive income (loss) before reclassifications	28,463			—			(6		)	28,457
Actuarial net loss incurred in the fiscal year	—			(1,481		)	—			(1,481		)
Amounts reclassified from accumulated other comprehensive loss	—			99			32			131
Net current-period other comprehensive income (loss)	28,463			(1,382		)	26			27,107
Balance as of December 31, 2017	(17,983		)	(47,198		)	26			(65,155		)
Other comprehensive income (loss) before reclassifications	(12,505		)	—			519			(11,986		)
Actuarial net loss incurred in the fiscal year	—			(1,678		)	—			(1,678		)
Amounts reclassified from accumulated other comprehensive loss	—			176			(191		)	(15		)
Net current-period other comprehensive income (loss)	(12,505		)	(1,502		)	328			(13,679		)
Balance as of December 31, 2018	$	(30,488	)	$	(48,700	)	$	354		$	(78,834	)

⁽¹⁾ Net of taxes of $9,984, $9,563 and $9,160 for the years ended December 31, 2018, 2017 and 2016, respectively.

⁽²⁾ Net of taxes of $106, $15 and $0 for the years ended December 31, 2018, 2017 and 2016, respectively.

Reclassification out of accumulated other comprehensive income

The impacts to the statements of operations related to reclassifications from accumulated other comprehensive loss for the years ended December 31, 2018 and 2017 were as follows:

(Dollars in thousands)	December 31, 2018			December 31, 2017			Financial Statement Line Item
Amortization of pension and other postretirement benefits
	$	(227	)	$	(154	)	Other income (expense), net(1)
	51			55			Income tax expense
	$	(176	)	$	(99	)	Net income
Unrealized gains (losses) on derivative instruments held at year end
	$	247		$	(51	)	Other income (expense), net
	(56		)	19			Income tax expense
	$	191		$	(32	)	Net income

⁽¹⁾ These accumulated other comprehensive loss components are included in the computation of net periodic pension cost. For additional details, refer to “Note 12 – Pension, Other Postretirement Benefits and Employee Savings and Investment Plans

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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2018

Business Acquisition [Line Items]

Business acquisition, pro forma information

The following unaudited pro forma financial information presents the combined results of operations of Rogers, Griswold, DSP, and DeWAL as if the Griswold acquisition had occurred on January 1, 2017, the DSP acquisition had occurred on January 1, 2016 and the DeWAL acquisition had occurred on January 1, 2015. The unaudited pro forma financial information is not intended to represent or be indicative of our consolidated results of operations that would have been reported had the Griswold, DSP, and DeWAL acquisitions been completed as of January 1, 2017, January 1, 2016 and January 1, 2015, respectively, and should not be taken as indicative of our future consolidated results of operations.

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	893,878	$	851,122	$	724,877
Net income	87,584		80,283		50,349

Schedule of asset acquisition

The assets acquired in connection with the acquisition were recorded by the Company at their estimated relative fair values as follows:

(Dollars in thousands)	August 28, 2018
Land	$	6,104
Buildings	8,401
Machinery and equipment	18,616
Equipment in process	12,633
Total property, plant and equipment	$	45,754

Griswold

Business Acquisition [Line Items]

Schedule of assets acquired and liabilities assumed

The following table represents the fair values assigned to the acquired assets and liabilities assumed in the transaction. As of the filing date of this Form 10-K, the purchase accounting and purchase price allocation for the Griswold acquisition are substantially complete, as we continue to refine our valuation of certain acquired assets and assumed liabilities.

(Dollars in thousands)	July 6, 2018
Assets:
Accounts receivable, less allowance for doubtful accounts	$	2,553
Inventories	2,951
Other current assets	155
Property, plant & equipment	7,554
Other intangible assets	34,120
Goodwill	31,738
Total assets	79,071
Liabilities:
Accounts payable	711
Accrued employee benefits and compensation	299
Other accrued liabilities	92
Total liabilities	1,102
Fair value of net assets acquired	$	77,969

Diversified Silicone Products, Inc.

Business Acquisition [Line Items]

Schedule of assets acquired and liabilities assumed

The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	January 6, 2017
Assets:
Accounts receivable	$	2,724
Prepaid expenses	21
Inventory	2,433
Property, plant & equipment	1,589
Other intangible assets	35,860
Goodwill	17,793
Total assets	60,420
Liabilities:
Accounts payable	179
Accrued expenses	50
Total liabilities	229
Fair value of net assets acquired	$	60,191

DeWAL

Business Acquisition [Line Items]

Schedule of assets acquired and liabilities assumed

The following table represents the fair values assigned to the acquired assets and liabilities in the transaction:

(Dollars in thousands)	November 23, 2016
Assets:
Cash and cash equivalents	$	1,539
Accounts receivable	7,513
Other current assets	691
Inventory	9,915
Property, plant & equipment	9,932
Other intangible assets	73,500
Goodwill	35,985
Other long-term assets	101
Total assets	139,176
Liabilities:
Accounts payable	2,402
Other current liabilities	1,292
Total liabilities	3,694
Fair value of net assets acquired	$	135,482

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:

Property, Plant and Equipment Classification	Estimated Useful Lives
Buildings and improvements	30-40 years
Machinery and equipment	5-15 years
Office equipment	3-10 years

	As of December 31,
(Dollars in thousands)	2018			2017
Land	$	21,525		$	14,620
Buildings and improvements	175,279			135,191
Machinery and equipment	256,301			238,000
Office equipment	64,886			56,554
Property plant and equipment, gross	517,991			444,365
Accumulated depreciation	(317,414		)	(289,909		)
Property, plant and equipment, net	200,577			154,456
Equipment in process	42,182			25,155
Total property, plant and equipment, net	$	242,759		$	179,611

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Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill, by segment

The changes in the carrying amount of goodwill for the period ending December 31, 2018, by operating segment, were as follows:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions			Power Electronics Solutions			Other		Total
December 31, 2017	$	51,693	$	111,575		$	71,615		$	2,224	$	237,107
Acquisition	—		32,305			—			—		32,305
Purchase accounting adjustment	—		(567		)	—			—		(567		)
Foreign currency translation adjustment	—		(724		)	(3,236		)	—		(3,960		)
December 31, 2018	$	51,693	$	142,589		$	68,379		$	2,224	$	264,885

Intangible assets

The changes in the carrying amount of other intangible assets for the two-year period ending December 31, 2018, were as follows:

	December 31, 2018						December 31, 2017
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	149,753	$	30,078	$	119,675	$	128,907	$	22,514	$	106,393
Technology	81,535		38,624		42,911		73,891		33,491		40,400
Trademarks and trade names	12,019		3,213		8,806		10,213		2,157		8,056
Covenants not to compete	1,340		249		1,091		1,799		1,108		691
Total definite-lived other intangible assets	244,647		72,164		172,483		214,810		59,270		155,540
Indefinite-lived other intangible asset	4,525		—		4,525		4,738		—		4,738
Total other intangible assets	$	249,172	$	72,164	$	177,008	$	219,548	$	59,270	$	160,278

Weighted average amortization period, by intangible asset class

The weighted average amortization period as of December 31, 2018, by definite-lived other intangible asset class, is presented in the table below:

Definite-Lived Other Intangible Asset Class	Weighted Average Remaining Amortization Period
Customer relationships	7.6
Technology	4.4
Trademarks and trade names	5.0
Covenants not to compete	2.1
Total definite-lived other intangible assets	6.6

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Years Ended December 31,
(In thousands, except per share amounts)	2018		2017		2016
Numerator:
Net income	$	87,651	$	80,459	$	48,283
Denominator:
Weighted-average shares outstanding - basic	18,374		18,154		17,991
Effect of dilutive shares	285		393		232
Weighted-average shares outstanding - diluted	18,659		18,547		18,223
Basic earnings per share:	$	4.77	$	4.43	$	2.68
Diluted earnings per share:	$	4.70	$	4.34	$	2.65

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Capital Stock and Equity Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares of capital stock reserved for possible future issuance

Shares of capital stock reserved for possible future issuance were as follows:

	As of December 31,
	2018	2017
Shares reserved for issuance under the stock acquisition program(1)	—	120,883
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan(2)	—	169,044
Shares reserved for issuance under outstanding stock options and restricted stock unit awards	413,294	545,018
Deferred compensation to be paid in stock, including deferred stock units	13,498	17,100
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan(3)	777,385	793,603
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees	106,344	117,987
Total	1,310,521	1,763,635

⁽¹⁾  The Company ceased offering capital stock under the stock acquisition program prior to the periods covered by this table.

⁽²⁾  The Company ceased offering its capital stock as an investment option under the Rogers Employee Savings and Investment Plan prior to the periods covered by this table.

⁽³⁾ This plan expired in early February 2019, and these shares are no longer available for issuance thereunder.

Schedule of weighted-average assumptions used

Weighted-average assumptions used to determine benefit obligations at December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	4.25	%	3.70	%	3.75	%	3.25	%

Weighted-average assumptions used to determine net benefit cost for the years ended December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	3.70	%	4.25	%	3.25	%	3.25	%
Expected long-term rate of return on plan assets	4.94	%	5.51	%	—	%	—	%

Activity under our stock option plans

A summary of the activity under our stock option plans for 2018, 2017 and 2016, is presented below:

	2018				2017				2016
	Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share		Options Outstanding		Weighted- Average Exercise Price Per Share
Options outstanding, vested and exercisable as of January 1	33,283		$	36.40	116,575		$	37.76	212,038		$	40.47
Options exercised	(22,333	)	38.57		(83,292	)	37.04		(95,113	)	43.56
Options forfeited	—		—		—		—		(350	)	44.32
Options outstanding, vested and exercisable as of December 31	10,950		$	31.99	33,283		$	36.40	116,575		$	37.76

Performance Shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of weighted-average assumptions used

Below were the assumptions used in the Monte Carlo calculation on the respective grant dates for awards granted in 2018 and 2017:

	September 17, 2018	February 8, 2018	February 9, 2017
Expected volatility	36.6%	34.8%	33.6%
Expected term (in years)	3.0	3.0	3.0
Risk-free interest rate	2.85%	2.28%	1.38%

Schedule of restricted stock and restricted stock activity

A summary of activity of the outstanding performance-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	169,202		$	97.16	151,769		$	89.72	107,229		$	66.13
Awards granted	75,760		163.55		56,147		110.77		84,443		69.01
Stock issued	(81,230	)	131.72		(34,442	)	86.59		(25,397	)	72.68
Awards forfeited	(21,298	)	114.40		(4,272	)	99.35		(14,506	)	104.83
Awards outstanding as of December 31	142,434		$	110.19	169,202		$	97.16	151,769		$	89.72

Time Based Restricted Stock

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted stock and restricted stock activity

A summary of activity of the outstanding time-based restricted stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	173,331		$	69.10	239,189		$	57.71	208,318		$	64.27
Awards granted	46,810		143.93		80,535		83.17		118,660		51.70
Stock issued	(82,921	)	84.92		(140,208	)	58.18		(60,326	)	64.03
Awards forfeited	(19,744	)	112.06		(6,185	)	60.70		(27,463	)	64.60
Awards outstanding as of December 31	117,476		$	116.10	173,331		$	69.10	239,189		$	57.71

Deferred Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted stock and restricted stock activity

deferred stock units for 2018, 2017 and 2016 is presented below:

	2018				2017				2016
	Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value		Awards Outstanding		Weighted- Average Grant Date Fair Value
Awards outstanding as of January 1	9,250		$	109.48	11,900		$	58.82	23,950		$	27.22
Awards granted	8,400		108.86		9,250		109.48		11,900		58.82
Stock issued	(9,250	)	109.48		(11,900	)	58.82		(23,950	)	52.69
Awards outstanding as of December 31	8,400		$	108.86	9,250		$	109.48	11,900		$	58.82

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Summarized Financial Information of Unconsolidated Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2018

Equity Method Investments and Joint Ventures [Abstract]

Joint ventures accounted for under equity method of accounting

Joint Venture	Location	Operating Segment	Fiscal Year-End
Rogers INOAC Corporation (RIC)	Japan	Elastomeric Material Solutions	October 31
Rogers INOAC Suzhou Corporation (RIS)	China	Elastomeric Material Solutions	December 31

Summarized information for joint ventures

The summarized financial information for the joint ventures for the periods indicated was as follows:

	As of December 31,
(Dollars in thousands)	2018		2017
Current assets	$	38,730	$	40,934
Non-current assets	$	4,839	$	4,947
Current liabilities	$	6,376	$	9,519
Shareholders' equity	$	37,193	$	36,362

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017		2016
Net sales	$	55,465	$	54,597	$	47,321
Gross profit	$	21,229	$	21,462	$	16,829
Net income	$	11,002	$	9,796	$	8,292

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Change in benefit obligation

The Company currently intends to terminate the Merged Plan and has requested a determination letter from the IRS. The termination of the Merged Plan remains subject to final approval by both management and the IRS. The Company plans to provide for lump sum distributions or annuity payments in connection with the termination of the Merged Plan and we expect the settlement process to be completed in 2019. The Company lacked sufficient information as of December 31, 2018 to determine the financial impact of the proposed plan termination. At this time, there are no plans to terminate the Union Plan.

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
Change in benefit obligation:	2018			2017			2018			2017
Benefit obligation at beginning of year	$	185,760		$	177,696		$	2,037		$	2,504
Service cost	—			—			73			80
Interest cost	6,758			7,356			62			71
Actuarial (gain) loss	(10,805		)	9,601			(5		)	460
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Plan amendment	—			—			—			(545		)
Benefit obligation at end of year	$	172,608		$	185,760		$	1,803		$	2,037

Change in plan assets

Change in plan assets:	2018			2017			2018			2017
Fair value of plan assets at the beginning of the year	$	180,056		$	171,778		$	—		$	—
Actual return on plan assets	(4,299		)	16,799			—			—
Employer contributions	25,000			372			364			533
Benefit payments	(9,105		)	(8,893		)	(364		)	(533		)
Fair value of plan assets at the end of the year	191,652			180,056			—			—
Funding status	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

Amounts recognized in consolidated balance sheet

Amounts included in the consolidated statements of financial position consist of:

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018			2017
Noncurrent assets	$	19,273		$	3,021		$	—		$	—
Current liabilities	(4		)	(5		)	(334		)	(352		)
Noncurrent liabilities	(225		)	(8,720		)	(1,469		)	(1,685		)
Net amount recognized at end of year	$	19,044		$	(5,704	)	$	(1,803	)	$	(2,037	)

Schedule of net periodic benefit cost not yet recognized

(Dollars in thousands)	Pension Benefits						Retirement Health and Life Insurance Benefits
	2018			2017			2018		2017
Net actuarial (loss) gain	$	(59,972	)	$	(59,645	)	$	68	$	63
Prior service benefit	—			—			1,220		2,821
Net amount recognized at end of year	$	(59,972	)	$	(59,645	)	$	1,288	$	2,884

Components of net periodic benefit cost

Components of Net Periodic (Benefit) Cost

(Dollars in thousands)	Pension Benefits									Retirement Health and Life Insurance Benefits
	2018			2017			2016			2018			2017			2016
Service cost	$	—		$	—		—			$	73		$	80		$	133
Interest cost	6,758			7,356			7,530			62			71			75
Expected return of plan assets	(8,662		)	(9,221		)	(10,808		)	—			—			—
Amortization of prior service cost (credit)	—			—			—			(1,602		)	(1,602		)	(1,489		)
Amortization of net loss	1,828			1,755			1,784			—			—			(47		)
Settlement charge	—			—			—			—			—			—
Net periodic benefit cost (benefit)	$	(76	)	$	(110	)	$	(1,494	)	$	(1,467	)	$	(1,451	)	$	(1,328	)

Schedule of weighted-average assumptions used

Weighted-average assumptions used to determine benefit obligations at December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	4.25	%	3.70	%	3.75	%	3.25	%

Weighted-average assumptions used to determine net benefit cost for the years ended December 31:

	Pension Benefits				Retirement Health and Life Insurance Benefits
	2018		2017		2018		2017
Discount rate	3.70	%	4.25	%	3.25	%	3.25	%
Expected long-term rate of return on plan assets	4.94	%	5.51	%	—	%	—	%

Schedule of effect of one-percentage-point change in assumed health care cost trend rates

A one-percentage point change in assumed health care cost trend rates would have been expected to have the following effects as of December 31, 2018:

(Dollars in thousands)	Increase		Decrease
Effect on total service and interest cost	$	8	$	(8	)
Effect on other postretirement benefit obligations	$	65	(60		)

Schedule of allocation of plan assets

The following table presents the fair value of the pension plan net assets by asset category and level, within the fair value hierarchy, as of December 31, 2018 and 2017.

	Assets at Fair Value as of December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	1,216	$	—	$	1,216
Fixed income bonds	—		186,385		—		186,385
Mutual funds	2,691		—		—		2,691
Guaranteed deposit account	—		—		1,360		1,360
Total assets at fair value	$	2,691	$	187,601	$	1,360	$	191,652

	Assets at Fair Value as of December 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Pooled separate accounts	$	—	$	4,610	$	—	$	4,610
Fixed income bonds	—		162,934		—		162,934
Mutual funds	6,223		—		—		6,223
Guaranteed deposit account	—		—		6,289		6,289
Total assets at fair value	$	6,223	$	167,544	$	6,289	$	180,056

Changes in fair value of Level 3 assets

The table below sets forth a summary of changes in the fair value of the guaranteed deposit account’s Level 3 assetsfor the year ended December 31, 2018:

(Dollars in thousands)	Guaranteed Deposit Account
Balance at beginning of year	$	6,289
Change in unrealized gain (loss)	(194		)
Purchases, sales, issuances and settlements (net)	(4,735		)
Balance at end of year	$	1,360

Schedule of future benefit payments

The following pension benefit payments are expected to be paid through the utilization of plan assets for the funded plans and from the Company’s operating cash flows for the unfunded plans. The Retiree Health and Life Insurance benefits, for which no funding has been made, are expected to be paid from the Company’s operating cash flows. The benefit payments are based on the same assumptions used to measure our benefit obligation at the end of fiscal 2018.

(Dollars in thousands)	Pension Benefits		Retiree Health and Life Insurance Benefits
2019	$	9,500	$	334
2020	$	9,597	$	265
2021	$	9,818	$	171
2022	$	10,038	$	134
2023	$	10,228	$	151
2024-2028	$	53,901	$	825

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments for Operating Leases

The following table includes future minimum lease payments under capital leases together with the present value of the net future minimum lease payments as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	543
2020	525
2021	4,276
2022	—
2023	—
Thereafter	—
Total	5,344
Less: Interest	(295		)
Present Value of Net Future Minimum Lease Payments	$	5,049

Schedule of Future Minimum Lease Payments for Capital Leases

The following table includes future minimum lease payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2018:

(Dollars in thousands)
Year Ending December 31,
2019	$	3,951
2020	3,052
2021	2,216
2022	1,507
2023	491
Thereafter	—
Total	$	11,217

Operating and capital leases

The following table includes lease expense for each of the three years ended December 31, 2018:

	For the Year Ended December 31,
(Dollars in thousands)	2018		2017		2016
Operating Leases	$	3,850	$	3,819	$	3,567
Capital Leases	$	472	$	608	$	564

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

The following table summarizes the change in number of asbestos claims outstanding during 2018 and 2017:

	2018		2017
Claims outstanding at beginning of year	687		605
New claims filed	275		362
Pending claims concluded*	(217	)	(280	)
Claims outstanding at end of year	745		687

* For the year ended December 31, 2018, 192 claims were dismissed and 25 claims were settled. For the year ended December 31, 2017, 258 claims were dismissed and 22 claims were settled.Settlements totaled approximately $7.1 million for the year ended December 31, 2018, compared to $5.0 million for the year ended December 31, 2017.

Schedule of Loss Contingencies by Contingency

For the years ended December 31, 2018 and 2017, our projected asbestos-related claims and insurance receivables were as follows:

(Dollars in millions)	2018		2017
Asbestos-related claims	$	70.3	$	76.2
Asbestos-related insurance receivables	$	63.8	$	69.2

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Consolidated income (loss) from continuing operations before income taxes by location

The “Income before income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	2018		2017		2016
Domestic	$	14,381	$	39,751	$	10,888
International	96,208		93,174		71,392
Total	$	110,589	$	132,925	$	82,280

Income tax expense (benefit) by location

The “Income tax expense” line item in the consolidated statements of operations consisted of:

(Dollars in thousands)	Current			Deferred			Total
2018
Domestic	$	(341	)	$	(3,007	)	$	(3,348	)
International	26,604			(318		)	26,286
Total	$	26,263		$	(3,325	)	$	22,938
2017
Domestic	$	7,535		$	21,936		$	29,471
International	27,418			(4,423		)	22,995
Total	$	34,953		$	17,513		$	52,466
2016
Domestic	$	2,078		$	3,376		$	5,454
International	24,537			4,006			28,543
Total	$	26,615		$	7,382		$	33,997

Deferred tax assets and liabilities

Deferred tax assets and liabilities as of December 31, 2018 and 2017, were comprised of the following:

(Dollars in thousands)	2018			2017
Deferred tax assets
Accrued employee benefits and compensation	$	4,269		$	8,410
Tax loss and credit carryforwards	18,604			7,905
Reserves and accruals	4,935			4,699
Other	1,953			2,977
Total deferred tax assets	29,761			23,991
Less deferred tax asset valuation allowance	(16,889		)	(8,754		)
Total deferred tax assets, net of valuation allowance	12,872			15,237
Deferred tax liabilities
Depreciation and amortization	8,335			14,300
Postretirement benefit obligations	3,234			2,311
Unremitted earnings	1,778			3,100
Other	2,094			224
Total deferred tax liabilities	15,441			19,935
Net deferred tax asset (liability)	$	(2,569	)	$	(4,698	)

Effective income tax rate reconciliation

Income tax expense differs from the amount computed by applying the United States federal statutory income tax rate to income before income taxes. The reasons for this difference were as follows:

(Dollars in thousands)	2018			2017			2016
Tax expense at Federal statutory income tax rate	$	23,224		$	46,529		$	28,798
International tax rate differential	826			(9,603		)	(2,260		)
Foreign source income, net of tax credits (excluding U.S. Tax Reform)	(197		)	1,087			1,215
State tax, net of federal	121			279			(200		)
Unrecognized tax benefits	(869		)	2,874			(5,555		)
U.S. Tax Reform	209			13,683			—
Equity compensation excess tax deductions	(2,238		)	(3,867		)	—
General business credits	(2,172		)	(1,080		)	(1,125		)
Distribution related foreign taxes	1,916			2,173			12,433
Valuation allowance change (excluding U.S. Tax Reform)	602			1,393			171
Other	1,516			(1,002		)	520
Income tax expense (benefit)	$	22,938		$	52,466		$	33,997

Reconciliation of unrecognized tax benefits

Unrecognized tax benefits, excluding potential interest and penalties, for the years ended December 31, 2018 and December 31, 2017, were as follows:

(Dollars in thousands)	2018			2017
Beginning balance	$	14,565		$	5,883
Gross increases - current period tax positions	2,583			7,056
Gross increases - tax positions in prior periods	505			3,243
Gross decreases - tax positions in prior periods	—			(375		)
Foreign currency exchange	(142		)	467
Lapse of statute of limitations	(7,710		)	(1,709		)
Ending balance	$	9,801		$	14,565

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Operating Segments and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Reportable segment information

The following table presents a disaggregation of revenue from contracts with customers and other pertinent financial information, for the periods indicated; inter-segment sales have been eliminated from the net sales data:

(Dollars in thousands)	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
2018
Net sales - recognized over time	$	—	$	5,788	$	221,896	$	16,973	$	244,657
Net sales - recognized at a point in time	$	294,154	$	335,576	$	1,442	$	3,262	$	634,434
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
Operating income	$	33,827	$	52,502	$	19,648	$	6,734	$	112,711
Total assets	$	396,075	$	588,841	$	273,212	$	21,216	$	1,279,344
Capital expenditures	$	61,425	$	10,917	$	18,051	$	156	$	90,549
Depreciation & amortization	$	20,121	$	18,501	$	10,640	$	811	$	50,073
Investment in unconsolidated joint ventures	$	—	$	18,667	$	—	$	—	$	18,667
Equity income in unconsolidated joint ventures	$	—	$	5,501	$	—	$	—	$	5,501
2017
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
Operating income	$	55,410	$	50,908	$	15,668	$	7,153	$	129,139
Total assets	$	353,786	$	489,456	$	261,034	$	20,858	$	1,125,134
Capital expenditures	$	9,900	$	7,563	$	9,238	$	514	$	27,215
Depreciation & amortization	$	16,351	$	16,270	$	10,572	$	906	$	44,099
Investment in unconsolidated joint ventures	$	—	$	18,324	$	—	$	—	$	18,324
Equity income in unconsolidated joint ventures	$	—	$	4,898	$	—	$	—	$	4,898
2016
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314
Operating income	$	42,455	$	25,884	$	5,229	$	7,329	$	80,897
Total assets	$	361,746	$	421,011	$	247,187	$	26,556	$	1,056,500
Capital expenditures	$	7,569	$	4,051	$	6,009	$	507	$	18,136
Depreciation & amortization	$	15,654	$	10,141	$	11,208	$	844	$	37,847
Investment in unconsolidated joint ventures	$	—	$	16,183	$	—	$	—	$	16,183
Equity income in unconsolidated joint ventures	$	—	$	4,146	$	—	$	—	$	4,146

The following table presents net sales by our operating segment operations by geographic area for the years indicated:

(Dollars in thousands)	Net Sales(1)
Region/Country	Advanced Connectivity Solutions		Elastomeric Material Solutions		Power Electronics Solutions		Other		Total
December 31, 2018
United States	$	52,661	$	152,284	$	37,325	$	4,527	$	246,797
Other Americas	3,104		14,453		931		773		19,261
Total Americas	55,765		166,737		38,256		5,300		266,058
China	136,315		101,036		39,781		4,959		282,091
Other APAC	63,318		40,788		28,414		2,892		135,412
Total APAC	199,633		141,824		68,195		7,851		417,503
Germany	18,165		9,907		62,359		584		91,015
Other EMEA	20,591		22,896		54,528		6,500		104,515
Total EMEA	38,756		32,803		116,887		7,084		195,530
Total net sales	$	294,154	$	341,364	$	223,338	$	20,235	$	879,091
December 31, 2017
United States	$	48,277	$	141,508	$	30,403	$	5,210	$	225,398
Other Americas	2,946		9,709		1,153		699		14,507
Total Americas	51,223		151,217		31,556		5,909		239,905
China	143,065		93,039		32,164		5,123		273,391
Other APAC	64,077		36,233		21,845		3,421		125,576
Total APAC	207,142		129,272		54,009		8,544		398,967
Germany	23,925		9,211		54,813		657		88,606
Other EMEA	18,802		22,961		44,576		7,226		93,565
Total EMEA	42,727		32,172		99,389		7,883		182,171
Total net sales	$	301,092	$	312,661	$	184,954	$	22,336	$	821,043
December 31, 2016
United States	$	46,951	$	61,188	$	25,599	$	5,499	$	139,237
Other Americas	2,035		7,722		313		855		10,925
Total Americas	48,986		68,910		25,912		6,354		150,162
China	137,695		77,033		20,964		5,511		241,203
Other APAC	53,082		29,109		17,751		3,898		103,840
Total APAC	190,777		106,142		38,715		9,409		345,043
Germany	19,842		7,621		53,426		849		81,738
Other EMEA	18,182		20,508		34,314		6,367		79,371
Total EMEA	38,024		28,129		87,740		7,216		161,109
Total net sales	$	277,787	$	203,181	$	152,367	$	22,979	$	656,314

⁽¹⁾ Net sales are allocated to countries based on the location of the customer. The table above lists individual countries with 10% or more of net sales for the periods indicated.

Revenue and long-lived assets by geographic region

Information relating to our long-lived assets by geographic area was as follows as of December 31 for the year indicated:

	Long-Lived Assets(1)
(Dollars in thousands)	2018		2017		2016
United States	$	476,560	$	370,964	$	326,199
China	58,205		57,404		62,728
Germany	113,412		114,497		101,725
Other	36,475		34,131		32,242
Total	$	684,652	$	576,996	$	522,894

⁽¹⁾ Long-lived assets are based on the location of the asset and are comprised of goodwill, other intangible assets and property, plant and equipment. Countries with 10% of more of long-lived assets have been disclosed.

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Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset

The following table presents contract assets by operating segment as of December 31, 2018:

	December 31, 2018
(Dollars in thousands)	Advanced Connectivity Solutions	Elastomeric Material Solutions	Power Electronics Solutions	Other	Total
Contract Assets	—	943	19,738	2,047	22,728

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The impact of adoption using the modified retrospective method on the Company’s consolidated financial statements is as follows:

	As of
Consolidated Statements of Financial Position:	December 31, 2017					January 1, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	18,099		$	18,099
Inventories	112,557		(12,307		)	100,250
Deferred income taxes	10,706		1,580			12,286
Retained earnings	684,540		4,212			688,752

The following tables set forth the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606, as compared to the guidance that was in effect before its adoption. The impact of adoption on the consolidated financial statements as of and for the year ended December 31, 2018 is as follows:

Consolidated Statements of Operations:	Year Ended
	December 31, 2018				December 31, 2018
(Dollars in thousands, except per share amounts)	Under ASC 605		Impact of Adoption		Under ASC 606
Net sales	$	874,462	$	4,629	$	879,091
Cost of sales	565,160		3,148		568,308
Income tax expense	22,558		380		22,938
Net income	86,550		1,101		87,651
Basic earnings per share	$	4.71	$	0.06	$	4.77
Diluted earnings per share	$	4.64	$	0.06	$	4.70

	As of
Consolidated Statements of Financial Position:	December 31, 2018					December 31, 2018
(Dollars in thousands)	Under ASC 605		Impact of Adoption			Under ASC 606
Contract assets	$	—	$	22,728		$	22,728
Inventories	148,092		(15,455		)	132,637
Deferred income taxes	8,846		1,960			10,806
Retained earnings	771,090		5,313			776,403

	Year Ended
Consolidated Statements of Cash Flows:	December 31, 2018						December 31, 2018
(Dollars in thousands)	Under ASC 605			Impact of Adoption			Under ASC 606
Cash provided by operating activities:
Net income	$	86,550		$	1,101		$	87,651
Deferred income taxes	(3,705		)	380			(3,325		)
Contract assets	—			(22,728		)	(22,728		)
Inventories	(34,468		)	15,455			(19,013		)
Other, net	(4,801		)	5,792			991
Net cash provided by operating activities	66,820			—			66,820

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Restructuring and Impairment Charges (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring and related costs

The following table presents severance activity related to the headquarters relocation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Headquarters Relocation
Balance as of December 31, 2017	$	183
Provisions	186
Payments	(264		)
Balance as of December 31, 2018	$	105

The following table presents severance activity related to the facility consolidation for the year ended December 31, 2018:

(Dollars in thousands)	Severance Related to Facility Consolidation
Balance as of December 31, 2017	$	—
Provisions	546
Payments	(23		)
Balance as of December 31, 2018	$	523

Restructuring and impairment charges

The following table summarizes the restructuring and impairment charges recorded in our operating results in 2018, 2017 and 2016:

(Dollars in thousands)	2018		2017		2016
Advanced Connectivity Solutions
Severance and other related costs	$	244	$	1,305	$	375
Allocated impairment charges	1,506		161		—
Elastomeric Material Solutions
Severance and other related costs	2,152		834		176
Allocated impairment charges	—		103		—
Power Electronics Solutions
Severance and other related costs	136		621		183
Allocated impairment charges	—		543		—
Total Restructuring and Impairment Charges	$	4,038	$	3,567	$	734

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Supplemental Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Income Statement Elements [Abstract]

Schedule of Income Statement Supplemental Disclosures

The components of Other operating (income) expense, net are as follows:

	Year Ended December 31,
(Dollars in thousands)	2018			2017			2016
Gain from antitrust litigation settlement	$	(4,231	)	$	—		$	—
Gain on sale of property, plant and equipment	(164		)	(5,329		)	—
Lease income	(948		)	—			—
Depreciation on leased assets	3,512			—			—
Indemnity claim settlement from acquisitions	(700		)	—			—
Economic incentive grants	(556		)	—			—
	$	(3,087	)	$	(5,329	)	$	—

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Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly financial information

	2018
(Dollars in thousands, except per share amounts)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	214,611	$	214,675	$	226,863	$	222,942
Gross margin	$	76,606	$	76,672	$	79,130	$	78,375
Net income	$	26,136	$	17,329	$	19,734	$	24,452
Net income per share:
Basic	$	1.43	$	0.94	$	1.07	$	1.33
Diluted	$	1.40	$	0.93	$	1.06	$	1.31

(Dollars in thousands, except per share amounts)	2017
	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Net sales	$	203,828	$	201,424	$	206,783	$	209,008
Gross margin	$	80,350	$	80,546	$	82,188	$	75,491
Net income	$	27,032	$	20,896	$	25,532	$	6,999
Net income per share:
Basic	$	1.50	$	1.15	$	1.40	$	0.38
Diluted	$	1.47	$	1.13	$	1.37	$	0.37

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Share Repurchases (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of shares of common stock through the repurchase program

We repurchased the following shares of capital stock through the Program, using cash from operations and cash on hand, during the years presented below:

	For the Years Ended December 31,
(Dollars in thousands)	2018		2017
Shares of capital stock repurchased	23,138		—
Value of capital stock repurchased	$	2,999	$	—

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Organization and Summary of Significant Accounting Policies (Reclassification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses	$ 164,046	$ 161,651	$ 139,272
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses		$ (1,600)	$ (3,000)

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Organization and Summary of Significant Accounting Policies (Organization) (Details)	12 Months Ended
	Dec. 31, 2018 Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments	3

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Organization and Summary of Significant Accounting Policies (Investments in Unconsolidated Joint Ventures) (Details)	12 Months Ended
	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Document Fiscal Year Focus	2018
Rogers INOAC Corporation (RIC)
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers INOAC Corporation (RIC) | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%
Rogers INOAC Suzhou Corporation (RIS) | INOAC Corporation
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	50.00%

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Organization and Summary of Significant Accounting Policies (Foreign Currency) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Currency transaction adjustment gain (loss)	$ (0.7)	$ 0.9	$ (2.7)

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Organization and Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Document Fiscal Year Focus	2018
Inventory, Gross [Abstract]
Raw materials	$ 59,321	$ 43,092
Work-in-process	30,086	28,133
Finished goods	43,230	41,332
Total inventories	$ 132,637	$ 112,557

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Organization and Summary of Significant Accounting Policies (Property, Plant and Equipment Estimated Useful Lives) (Details)	12 Months Ended
	Dec. 31, 2018
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	30 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years
Office equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Office equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years

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Organization and Summary of Significant Accounting Policies (Income Tax) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Deferred tax liabilities, undistributed foreign earnings	$ 1.8	$ 1.8	$ 3.1
Provisional income tax expense (benefit)		(7.5)
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)	$ 0.2	0.2
Change in tax rate, deferred tax asset, provisional income tax expense		$ 7.7

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Organization and Summary of Significant Accounting Policies (Software Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Net capitalized software and development costs	$ 1.7	$ 4.7
Software and Software Development Costs | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Software and Software Development Costs | Maximum
Property, Plant and Equipment [Line Items]
Useful life	5 years

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Organization and Summary of Significant Accounting Policies (Goodwill and Intangible Assets) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Number of reportable segments | Segment	4
Current Fiscal Year End Date	--12-31
Goodwill	$ 264,885	$ 237,107
Indefinite-lived other intangible asset	4,525	4,738
Definite-lived other intangible assets	172,483	155,540
Advanced Connectivity Solutions
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 51,693	51,693
Elastomeric Material Solutions
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Discount rate used	11.25%
Goodwill	$ 142,589	111,575
Elastomeric Material Solutions | Measurement Input, Long-term Revenue Growth Rate
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Terminal year growth rate	0.059
Curamik
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived other intangible asset	$ 4,500
Elastomer Component Division
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Discount rate used	12.90%
Elastomer Component Division | Measurement Input, Long-term Revenue Growth Rate
Indefinite-lived Intangible Assets [Line Items]
Sensitivity analysis, Terminal year growth rate	0.049
Power Electronics Solutions
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 68,379	71,615
Other
Indefinite-lived Intangible Assets [Line Items]
Goodwill	2,224	$ 2,224
ACS
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	7,900
EMS
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	152,200
Curamik
Indefinite-lived Intangible Assets [Line Items]
Definite-lived other intangible assets	$ 12,400

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Organization and Summary of Significant Accounting Policies (Fair Value of Financial Statements) (Details) - London Interbank Offered Rate (LIBOR)	12 Months Ended
	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate spread over variable rate	1.50%
Third Amended Credit Agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate spread over variable rate	1.50%

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Organization and Summary of Significant Accounting Policies (Concentration of Credit and Investment Risk) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Significant credit losses, amount	$ 0

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Organization and Summary of Significant Accounting Policies (Advertising Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Advertising expense	$ 3.8	$ 4.4	$ 3.0

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Organization and Summary of Significant Accounting Policies (Equity Compensation) (Details)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Anniversary period from grant date	13 months

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Fair Value Measurements (Various Instruments That Require Fair Value Measurement) (Detail) - Fair Value, Recurring - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Foreign currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	$ 522	$ (396)
Foreign currency contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Foreign currency contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	522	(396)
Foreign currency contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Copper derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	583	2,016
Copper derivative contracts | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Copper derivative contracts | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	583	2,016
Copper derivative contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	461	41
Interest rate swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	0	0
Interest rate swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	461	41
Interest rate swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of derivatives	$ 0	$ 0

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Hedging Transactions and Derivative Financial Instruments (Additional Information) (Detail) $ in Millions	Dec. 31, 2018 T / mo Contract	Mar. 31, 2017 USD ($)	Feb. 17, 2017 USD ($)
Bank Term Loan
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative contracts related to minimizing risk associated with potential rise in copper prices | Contract	26
Revolving Credit Facility | Third Amended Credit Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit agreement, maximum borrowing capacity | $			$ 450.0
Revolving Credit Facility | Third Amended Credit Agreement | Interest rate swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, amount of hedged item | $		$ 75.0
Designated as Hedging Instrument | January 2019 - March 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	189
Designated as Hedging Instrument | April 2019 - June 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	188
Designated as Hedging Instrument | July 2019 - September 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	191
Designated as Hedging Instrument | October 2019 - December 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	195
Designated as Hedging Instrument | January 2020 - March 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume of copper derivatives	202

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Hedging Transactions and Derivative Financial Instruments (Notional Values of Derivative Instruments) (Detail) - Not Designated as Hedging Instrument - Foreign Exchange Forward	Dec. 31, 2018 USD ($)
USD/KRW Notional Amount of Foreign Currency Derivatives
Derivative [Line Items]
Notional values of foreign currency derivatives	$ 1,325,760,000
JPY/EUR Notional Amount of Foreign Currency Derivatives
Derivative [Line Items]
Notional values of foreign currency derivatives	675,000,000
EUR/USD Notional Amount of Foreign Currency Derivatives
Derivative [Line Items]
Notional values of foreign currency derivatives	10,449,335
USD/CNY Notional Amount of Foreign Currency Derivatives
Derivative [Line Items]
Notional values of foreign currency derivatives	$ 23,655,942

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Hedging Transactions and Derivative Financial Instruments (Effect and Fair Value of Derivative Instruments) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Not Designated as Hedging Instrument | Other income (expense), net | Foreign Exchange Contracts
Derivative [Line Items]
Effect of current derivative instruments	$ (333)	$ (7)
Fair values of derivative instruments	522	(396)
Not Designated as Hedging Instrument | Other income (expense), net | Copper Derivatives
Derivative [Line Items]
Effect of current derivative instruments	(2,101)	1,928
Fair values of derivative instruments	583	2,016
Designated as Hedging Instrument | Other comprehensive income (loss) | Interest Rate Swap
Derivative [Line Items]
Effect of current derivative instruments	420	41
Fair values of derivative instruments	$ 461	$ 41

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Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 766,573	$ 635,786	$ 584,582
Other comprehensive income (loss) before reclassifications	(11,986)	28,457
Actuarial net loss incurred in the fiscal year	(1,678)	(1,481)
Amounts reclassified from accumulated other comprehensive loss	(15)	131
Net current-period other comprehensive income (loss)	(13,679)	27,107
Ending Balance	848,324	766,573	635,786
AOCI, Pension and other postretirement benefit plans, tax	9,984	9,563	9,160
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax	106	15	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(17,983)	(46,446)
Other comprehensive income (loss) before reclassifications	(12,505)	28,463	(5,081)
Actuarial net loss incurred in the fiscal year	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	(12,505)	28,463
Ending Balance	(30,488)	(17,983)	(46,446)
Accumulated Other Comprehensive Income (Loss) Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(47,198)	(45,816)
Other comprehensive income (loss) before reclassifications	0	0
Actuarial net loss incurred in the fiscal year	(1,678)	(1,481)	1,106
Amounts reclassified from accumulated other comprehensive loss	176	99	160
Net current-period other comprehensive income (loss)	(1,502)	(1,382)
Ending Balance	(48,700)	(47,198)	(45,816)
Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	26	0
Other comprehensive income (loss) before reclassifications	519	(6)	0
Actuarial net loss incurred in the fiscal year	0	0
Amounts reclassified from accumulated other comprehensive loss	(191)	32
Net current-period other comprehensive income (loss)	328	26
Ending Balance	354	26	0
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(65,155)	(92,262)	(88,458)
Ending Balance	$ (78,834)	$ (65,155)	$ (92,262)

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Accumulated Other Comprehensive Loss (Reclassification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ (994)	$ 5,019	$ 1,167
Income tax expense	(22,938)	(52,466)	(33,997)
Net income	87,651	80,459	$ 48,283
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Funded status of pension plans and other postretirement benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	(227)	(154)
Income tax expense	51	55
Net income	(176)	(99)
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Unrealized gain (loss) on derivative instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	247	(51)
Income tax expense	(56)	19
Net income	$ 191	$ (32)

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Acquisitions (Narrative) (Details) - USD ($)					6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 28, 2018	Jul. 06, 2018	Jan. 06, 2017	Nov. 23, 2016	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life							6 years 7 months 2 days
Amortization expense							$ 16,500,000	$ 14,800,000	$ 11,200,000
Estimated future amortization expense for 2019					$ 17,700,000		17,700,000
Estimated future amortization expense for 2020					14,600,000		14,600,000
Estimated future amortization expense for 2021					13,800,000		13,800,000
Estimated future amortization expense for 2022					13,300,000		13,300,000
Estimated future amortization expense for 2023					12,700,000		$ 12,700,000
Asset acquisition, consideration transferred	$ 43,434,000
Lease, cost	45,800,000
Finance lease, principal payments	2,000,000
Asset acquisition, transaction costs	$ 400,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life							7 years 6 months 19 days
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life							4 years 4 months 7 days
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life							2 years 1 month 6 days
Griswold
Finite-Lived Intangible Assets [Line Items]
Percentage of membership interests acquired		100.00%
Purchase price		$ 78,000,000
Cash from credit facility used to fund acquisition		82,500,000
Earn out payment		3,000,000
Actual earn out payment		0
Estimated future amortization expense for 2020						$ 2,800,000
Estimated future amortization expense for 2021						3,000,000
Estimated future amortization expense for 2022						2,800,000
Estimated future amortization expense for 2023					2,500,000	$ 2,700,000	$ 2,500,000
Business acquisition, acquiree revenue					13,700,000
Griswold | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		22,100,000
Weighted average useful life							9 years 6 months
Griswold | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		9,600,000
Weighted average useful life							3 years 6 months
Griswold | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		1,800,000
Weighted average useful life							10 years 4 months 24 days
Griswold | Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 600,000
Weighted average useful life						3 years 2 months
Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Purchase price			$ 60,200,000
Cash from credit facility used to fund acquisition			30,000,000
Estimated future amortization expense for 2019					1,800,000		$ 1,800,000
Estimated future amortization expense for 2020					1,800,000		1,800,000
Estimated future amortization expense for 2021					1,800,000		1,800,000
Estimated future amortization expense for 2022					1,700,000		1,700,000
Estimated future amortization expense for 2023					1,700,000		$ 1,700,000
Transaction costs								500,000
Business acquisition, acquiree revenue								$ 22,300,000
Diversified Silicone Products, Inc. | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			30,500,000
Weighted average useful life							11 years 9 months 18 days
Diversified Silicone Products, Inc. | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			1,800,000
Weighted average useful life							4 years 3 months 18 days
Diversified Silicone Products, Inc. | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			3,300,000
Weighted average useful life							11 years 8 months 12 days
Diversified Silicone Products, Inc. | Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired			$ 300,000
Weighted average useful life							4 years 1 month 6 days
DeWAL
Finite-Lived Intangible Assets [Line Items]
Purchase price				$ 135,500,000
Cash from credit facility used to fund acquisition				136,000,000
Estimated future amortization expense for 2019					4,100,000		$ 4,100,000
Estimated future amortization expense for 2020					4,300,000		4,300,000
Estimated future amortization expense for 2021					4,300,000		4,300,000
Estimated future amortization expense for 2022					4,300,000		4,300,000
Estimated future amortization expense for 2023					$ 4,300,000		$ 4,300,000
Transaction costs									2,100,000
Business acquisition, acquiree revenue									$ 5,400,000
DeWAL | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				46,700,000
Weighted average useful life							13 years 6 months
DeWAL | Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				22,000,000
Weighted average useful life							8 years 7 months 6 days
DeWAL | Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				4,300,000
Weighted average useful life							5 years 2 months 12 days
DeWAL | Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$ 500,000
Weighted average useful life							3 years 9 months 18 days
Minimum | Griswold
Finite-Lived Intangible Assets [Line Items]
Amortization expense							$ 700,000
Minimum | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortization expense							1,100,000
Minimum | DeWAL
Finite-Lived Intangible Assets [Line Items]
Amortization expense							2,400,000
Maximum | Griswold
Finite-Lived Intangible Assets [Line Items]
Amortization expense							3,000,000
Maximum | Diversified Silicone Products, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortization expense							2,000,000
Maximum | DeWAL
Finite-Lived Intangible Assets [Line Items]
Amortization expense							4,300,000
Selling, General and Administrative Expenses | Griswold
Finite-Lived Intangible Assets [Line Items]
Transaction costs							$ 1,100,000

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Acquisitions (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jul. 06, 2018	Dec. 31, 2017	Jan. 06, 2017	Nov. 23, 2016
Assets:
Goodwill	$ 264,885		$ 237,107
Griswold
Assets:
Accounts receivable		$ 2,553
Other current assets		155
Inventory		2,951
Property, plant & equipment		7,554
Other intangible assets		34,120
Goodwill		31,738
Total assets		79,071
Liabilities:
Accounts payable		711
Accrued employee benefits and compensation		299
Other accrued liabilities		92
Total liabilities		1,102
Fair value of net assets acquired		$ 77,969
Diversified Silicone Products, Inc.
Assets:
Accounts receivable				$ 2,724
Prepaid expenses				21
Inventory				2,433
Property, plant & equipment				1,589
Other intangible assets				35,860
Goodwill				17,793
Total assets				60,420
Liabilities:
Accounts payable				179
Accrued expenses				50
Total liabilities				229
Fair value of net assets acquired				$ 60,191
DeWAL
Assets:
Cash and equivalents					$ 1,539
Accounts receivable					7,513
Other current assets					691
Inventory					9,915
Property, plant & equipment					9,932
Other intangible assets					73,500
Goodwill					35,985
Other long-term assets					101
Total assets					139,176
Liabilities:
Accounts payable					2,402
Other current liabilities					1,292
Total liabilities					3,694
Fair value of net assets acquired					$ 135,482

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Acquisitions (Business Acquisition Pro Forma Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Net sales	$ 893,878	$ 851,122	$ 724,877
Net income	$ 87,584	$ 80,283	$ 50,349

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Acquisitions (Schedule of Asset Acquisition) (Details) $ in Thousands	Aug. 28, 2018 USD ($)
Business Combinations [Abstract]
Land	$ 6,104
Buildings	8,401
Machinery and equipment	18,616
Equipment in process	12,633
Total property, plant and equipment	$ 45,754

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Property, Plant and Equipment (Schedule of Plant Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 517,991	$ 444,365
Accumulated depreciation	(317,414)	(289,909)
Property, plant and equipment, net	200,577	154,456
Equipment in process	42,182	25,155
Total property, plant and equipment, net	242,759	179,611
Land
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	21,525	14,620
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	175,279	135,191
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	256,301	238,000
Office equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	$ 64,886	$ 56,554

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Property, Plant and Equipment (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation				$ 33,500	$ 29,300	$ 26,600
Impairment charges				1,506	807	0
Assets held for sale				0	896
Gain on sale of property, plant and equipment				$ 3,087	$ 5,329	$ 0
Property plant and equipment, held for sale							$ 400
Arizona
Property, Plant and Equipment [Line Items]
Assets held for sale								$ 900
Gain on sale of property, plant and equipment	$ 400
Belgium
Property, Plant and Equipment [Line Items]
Gain on sale of property, plant and equipment		$ 4,400	$ 900

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Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 237,107
Acquisition	32,305
Purchase accounting adjustment	(567)
Foreign currency translation adjustment	(3,960)
Ending balance	264,885
Advanced Connectivity Solutions
Goodwill [Roll Forward]
Beginning balance	51,693
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	0
Ending balance	51,693
Elastomeric Material Solutions
Goodwill [Roll Forward]
Beginning balance	111,575
Acquisition	32,305
Purchase accounting adjustment	(567)
Foreign currency translation adjustment	(724)
Ending balance	142,589
Power Electronics Solutions
Goodwill [Roll Forward]
Beginning balance	71,615
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	(3,236)
Ending balance	68,379
Other
Goodwill [Roll Forward]
Beginning balance	2,224
Acquisition	0
Purchase accounting adjustment	0
Foreign currency translation adjustment	0
Ending balance	$ 2,224

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Goodwill and Other Intangible Assets (Intangible Assets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 244,647	$ 214,810
Accumulated Amortization	72,164	59,270
Net Carrying Amount	172,483	155,540
Indefinite-lived other intangible asset	4,525	4,738
Total other intangible assets	249,172	219,548
Other intangible assets, net of amortization	177,008	160,278
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	149,753	128,907
Accumulated Amortization	30,078	22,514
Net Carrying Amount	119,675	106,393
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	81,535	73,891
Accumulated Amortization	38,624	33,491
Net Carrying Amount	42,911	40,400
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,019	10,213
Accumulated Amortization	3,213	2,157
Net Carrying Amount	8,806	8,056
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,340	1,799
Accumulated Amortization	249	1,108
Net Carrying Amount	$ 1,091	$ 691

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Goodwill and Other Intangible Assets (Additional Information) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 16.5	$ 14.8	$ 11.2
Estimated future amortization expense for 2019	17.7
Estimated future amortization expense for 2020	14.6
Estimated future amortization expense for 2021	13.8
Estimated future amortization expense for 2022	13.3
Estimated future amortization expense for 2023	$ 12.7

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Goodwill and Other Intangible Assets (Weighted Average Amortization Period by Intangible Asset Class) (Detail)	12 Months Ended
	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	6 years 7 months 2 days
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	7 years 6 months 19 days
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years 4 months 7 days
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	5 years 11 days
Covenants not to compete
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	2 years 1 month 6 days

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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 87,651	$ 80,459	$ 48,283
Denominator:
Weighted-average shares outstanding - basic (in shares)	18,374,000	18,154,000	17,991,000
Effect of dilutive shares (in shares)	285,000	393,000	232,000
Weighted-average shares outstanding - diluted (in shares)	18,659,000	18,547,000	18,223,000
Basic earnings per share (in dollars per share)	$ 4.77	$ 4.43	$ 2.68
Diluted earnings per share (in dollars per share)	$ 4.70	$ 4.34	$ 2.65
Antidilutive securities excluded from computation of earnings per share (shares)	36,642	0	0

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Capital Stock and Equity Compensation (Shares of Capital Stock Reserved) (Details) - shares	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	1,310,521	1,763,635
Shares reserved for issuance under the stock acquisition program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	0	120,883
Shares reserved for issuance under the Rogers Employee Savings and Investment Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	0	169,044
Shares reserved for issuance under outstanding stock options and restricted stock unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	413,294	545,018
Deferred compensation to be paid in stock, including deferred stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	13,498	17,100
Additional shares reserved for issuance under Rogers Corporation 2009 Long-Term Equity Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	777,385	793,603
Shares reserved for issuance under the Rogers Corporation Global Stock Ownership Plan for Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	106,344	117,987

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Capital Stock and Equity Compensation (Additional Information) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) offering_periods	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anniversary period from grant date	13 months
Total intrinsic value of options exercised in period	$ 2.4	$ 6.0
Cash received from exercise of options exercised	$ 0.9	$ 3.1
Weighted-Average Remaining Contractual Life in Years, Options outstanding	2 years	2 years 2 months
Aggregate Intrinsic Value, Options outstanding	$ 0.7	$ 4.2
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.3	0.5
Employee stock purchase plan number of offering periods | offering_periods	2
Employee stock purchase plan length of offering periods	6 months
Discount from market price percentage	15.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Measurement period	3 years
Expected dividend yield	0.00%
Compensation expense	$ 4.4	4.7	$ 4.6
Nonvested awards, total compensation cost not yet recognized	$ 6.0
Future compensation cost, period of recognition	10 months 24 days
Performance Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	0.00%
Performance Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)	200.00%
Time Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5.6	5.7	5.6
Nonvested awards, total compensation cost not yet recognized	$ 6.7
Future compensation cost, period of recognition	10 months 24 days
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.9	$ 1.0	$ 0.7
Anniversary period from grant date	13 months
Converstion ratio	1
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term (years)	10 years

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Capital Stock and Equity Compensation (Monte Carlo Assumptions Used) (Details) - Performance Shares	Sep. 17, 2018	Feb. 08, 2018	Feb. 09, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	36.60%	34.80%	33.60%
Expected term (in years)	3 years	3 years	3 years
Risk-free interest rate	2.85%	2.28%	1.38%

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Capital Stock and Equity Compensation (Performance Based Restricted Stock Awards) (Detail) - Performance Shares - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Awards Outstanding
Non-vested awards outstanding, beginning balance (in shares)	169,202	151,769	107,229
Awards granted (in shares)	75,760	56,147	84,443
Stock issued (in shares)	(81,230)	(34,442)	(25,397)
Awards forfeited or expired (in shares)	(21,298)	(4,272)	(14,506)
Non-vested awards outstanding, ending balance (in shares)	142,434	169,202	151,769
Weighted- Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$ 97.16	$ 89.72	$ 66.13
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	163.55	110.77	69.01
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	131.72	86.59	72.68
Weighted-Average Grant Date Fair Value, Awards forfeited (in dollars per share)	114.40	99.35	104.83
Weighted-Average Grant Date Fair Value, Outstanding at period end (in dollars per share)	$ 110.19	$ 97.16	$ 89.72

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Capital Stock and Equity Compensation (Time Based Restricted Stock Awards) (Detail) - Time Based Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Awards Outstanding
Non-vested awards outstanding, beginning balance (in shares)	173,331	239,189	208,318
Awards granted (in shares)	46,810	80,535	118,660
Stock issued (in shares)	(82,921)	(140,208)	(60,326)
Awards forfeited or expired (in shares)	(19,744)	(6,185)	(27,463)
Non-vested awards outstanding, ending balance (in shares)	117,476	173,331	239,189
Weighted- Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$ 69.10	$ 57.71	$ 64.27
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	143.93	83.17	51.70
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	84.92	58.18	64.03
Weighted-Average Grant Date Fair Value, Awards forfeited (in dollars per share)	112.06	60.70	64.60
Weighted-Average Grant Date Fair Value, Outstanding at period end (in dollars per share)	$ 116.10	$ 69.10	$ 57.71

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Capital Stock and Equity Compensation (Deferred Stock Units) (Detail) - Deferred Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Awards Outstanding
Non-vested awards outstanding, beginning balance (in shares)	9,250	11,900	23,950
Awards granted (in shares)	8,400	9,250	11,900
Stock issued (in shares)	(9,250)	(11,900)	(23,950)
Non-vested awards outstanding, ending balance (in shares)	8,400	9,250	11,900
Weighted- Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding at period beginning (in dollars per share)	$ 109.48	$ 58.82	$ 27.22
Weighted-Average Grant Date Fair Value, Awards granted (in dollars per share)	108.86	109.48	58.82
Weighted-Average Grant Date Fair Value, Stock issued (in dollars per share)	109.48	58.82	52.69
Weighted-Average Grant Date Fair Value, Outstanding at period end (in dollars per share)	$ 108.86	$ 109.48	$ 58.82

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Capital Stock and Equity Compensation (Summary of Activity Under Stock Option Plans) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Options Outstanding
Options outstanding at beginning of period (in shares)	33,283	116,575	212,038
Options exercised (in shares)	(22,333)	(83,292)	(95,113)
Options forfeited (in shares)	0	0	(350)
Options outstanding at end of period (in shares)	10,950	33,283	116,575
Weighted- Average Exercise Price Per Share
Weighted Average Exercise Price Per Share, Outstanding at period start (in dollars per share)	$ 36.40	$ 37.76	$ 40.47
Weighted Average Exercise Price Per Share, Options exercised (in dollars per share)	38.57	37.04	43.56
Weighted Average Exercise Price Per Share, Options forfeited (in dollars per share)	0.00	0.00	44.32
Weighted Average Exercise Price Per Share, Outstanding at period end (in dollars per share)	$ 31.99	$ 36.40	$ 37.76

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Joint Ventures (Additional Information) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) joint_venture	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of joint ventures that are 50% owned | joint_venture	2
Equity income in unconsolidated joint ventures	$ 5,501	$ 4,898	$ 4,146
Due from joint ventures, current	$ 1,500	3,700
Rogers INOAC Corporation (RIC)
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Due to related parties, current	$ 2,300	$ 2,100
INOAC Corporation | Rogers INOAC Corporation (RIC)
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture	50.00%

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Joint Ventures (Accounted for Under Equity Method of Accounting) (Detail)	12 Months Ended
	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31
Rogers INOAC Corporation (RIC) | Japan | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--10-31
Rogers INOAC Suzhou Corporation (RIS) | China | Elastomeric Material Solutions
Schedule of Equity Method Investments [Line Items]
Fiscal Year-End	--12-31

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Joint Ventures (Assets, Liabilities, and Equity) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 38,730	$ 40,934
Non-current assets	4,839	4,947
Current liabilities	6,376	9,519
Shareholders' equity	$ 37,193	$ 36,362

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Joint Ventures (Sales, Profit, and Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Net sales	$ 55,465	$ 54,597	$ 47,321
Gross profit	21,229	21,462	16,829
Net income	$ 11,002	$ 9,796	$ 8,292

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Debt and Capital Leases (Additional Information) (Detail)			12 Months Ended
	Jul. 06, 2018 USD ($)	Feb. 17, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Jun. 18, 2015
Debt Instrument [Line Items]
Interest expense on debt			$ 6,100,000	$ 5,200,000	$ 3,100,000
Unused commitment fee			600,000	600,000	400,000
Borrowings under revolving credit facility			$ 228,482,000	130,982,000
Leverage ratio, cash dividends, maximum			2.75
Maximum
Debt Instrument [Line Items]
Allowed dividend payments			$ 20,000,000
Third Amended Credit Agreement
Debt Instrument [Line Items]
Leverage ratio, maximum		3.25
Maximum leverage ratio option		3.5
Interest coverage ratio, minimum		3
Repayments of lines of credit			5,000,000	110,200,000
Long-term line of credit			1,700,000
Amortization expense, debt issue costs			$ 600,000	500,000
Third Amended Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Term		5 years
Credit agreement, maximum borrowing capacity		$ 450,000,000
Line of credit facility, additional borrowing capacity		$ 175,000,000
Third Amended Credit Agreement | Minimum | Revolving Credit Facility
Debt Instrument [Line Items]
Unused commitment fee, percentage			2000.00%
Third Amended Credit Agreement | Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Unused commitment fee, percentage			3000.00%
Interest rate swap | Third Amended Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Derivative, amount of hedged item						$ 75,000,000
Germany
Debt Instrument [Line Items]
Initial lease term expiration year			2021
Capital lease obligation			$ 5,000,000	5,700,000
Amortization expense related to the capital lease			300,000	300,000	$ 300,000
Capital leases accumulated depreciation			3,500,000	$ 3,300,000
Griswold
Debt Instrument [Line Items]
Cash from credit facility used to fund acquisition	$ 82,500,000
Merged Plan
Debt Instrument [Line Items]
Additional proceeds under line of credit			$ 20,000,000
Secured Revolving Credit Agreement
Debt Instrument [Line Items]
Debt instrument, lower range basis spread on variable rate							3750.00%
Debt instrument, higher range basis spread on variable rate							7500.00%
Secured Revolving Credit Agreement | Eurocurrency loans
Debt Instrument [Line Items]
LIBOR spread minimum							13750.00%
LIBOR spread maximum							17500.00%
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis points spread			1.50%
London Interbank Offered Rate (LIBOR) | Third Amended Credit Agreement
Debt Instrument [Line Items]
Basis points spread			1.50%

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Additional Information) (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets		$ 200,000	$ 155,800,000
Accumulated benefit obligation of plan with accumulated benefit obligation in excess of plan assets		200,000	155,800,000
Fair value of the plan assets of plan with accumulated benefit obligation in excess of plan assets		0	147,100,000
Projected benefit obligation of plan with plan assets in excess of accumulated benefit obligation		172,400,000	30,000,000
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation		172,400,000	30,000,000
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation		$ 191,700,000	33,000,000
Health care cost, employees age		65 years
Health care cost trend rate annual change		0.25%
Percentage point change in assumed health care cost trend rates		1.00%
Historical return on plan assets over 20 years		7.05%
Anticipated payment for defined benefit pensions	$ 25,000,000	$ 25,354,000	$ 906,000	$ 842,000
Document Fiscal Year Focus		2018
Retirees of 65 Years Old or Younger
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed for next fiscal year		7.00%	7.25%
Ultimate health care cost trend rate		4.50%
Retirees of 65 Years Old or Older
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed for next fiscal year		7.00%	7.25%
Ultimate health care cost trend rate		4.50%
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net loss to be recognized over next twelve months		$ 1,800,000
Expected long-term rate of return on plan assets		4.69%
Required employer contribution			$ 400,000
Employer contributions		$ 25,000,000	$ 372,000
Pension Benefits | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan asset allocations		1.00%	4.00%
Pension Benefits | Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan asset allocations		99.00%	96.00%
Retirement Health and Life Insurance Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net loss to be recognized over next twelve months		$ 1,000,000
Employer contributions		364,000	$ 533,000
Rogers Employee Savings and Investment Plan (RESIP)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
IRS deferral limit		$ 18,500
Employee compensation subject to employer matching percent		6.00%
Employer contributions		$ 5,600,000	$ 4,000,000	$ 3,000,000
Rogers Employee Savings and Investment Plan (RESIP) | 100% match
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee compensation subject to employer matching percent		3.50%
Rogers Employee Savings and Investment Plan (RESIP) | 100% match | 1% of compensation
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee compensation subject to employer matching percent		1.00%
Employer matching contribution percent		100.00%
Rogers Employee Savings and Investment Plan (RESIP) | 50% match | 5% of compensation
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee compensation subject to employer matching percent		5.00%
Employer matching contribution percent		50.00%
DeWAL Industries, Inc 401k Profit Sharing Plan (DeWAL Plan)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employee compensation subject to employer matching percent		3.00%
Employer matching contribution, percent of match		100.00%

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Obligations and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	$ 185,760	$ 177,696
Service cost	0	0	$ 0
Interest cost	6,758	7,356	7,530
Actuarial (gain) loss	(10,805)	9,601
Benefit payments	(9,105)	(8,893)
Plan amendment	0	0
Benefit obligation at end of year	172,608	185,760	177,696
Change in plan assets:
Fair value of plan assets at the beginning of the year	180,056	171,778
Actual return on plan assets	(4,299)	16,799
Employer contributions	25,000	372
Benefit payments	(9,105)	(8,893)
Fair value of plan assets at the end of the year	191,652	180,056	171,778
Funding status	19,044	(5,704)
Retirement Health and Life Insurance Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	2,037	2,504
Service cost	73	80	133
Interest cost	62	71	75
Actuarial (gain) loss	(5)	460
Benefit payments	(364)	(533)
Plan amendment	0	(545)
Benefit obligation at end of year	1,803	2,037	2,504
Change in plan assets:
Fair value of plan assets at the beginning of the year	0	0
Actual return on plan assets	0	0
Employer contributions	364	533
Benefit payments	(364)	(533)
Fair value of plan assets at the end of the year	0	0	$ 0
Funding status	$ (1,803)	$ (2,037)

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	$ 19,273	$ 3,021
Current liabilities	(4)	(5)
Noncurrent liabilities	(225)	(8,720)
Net amount recognized at end of year	19,044	(5,704)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial (loss) gain	(59,972)	(59,645)
Prior service benefit	0	0
Net amount recognized at end of year	(59,972)	(59,645)
Retirement Health and Life Insurance Benefits
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	0
Current liabilities	(334)	(352)
Noncurrent liabilities	(1,469)	(1,685)
Net amount recognized at end of year	(1,803)	(2,037)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial (loss) gain	68	63
Prior service benefit	1,220	2,821
Net amount recognized at end of year	$ 1,288	$ 2,884

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	6,758	7,356	7,530
Expected return of plan assets	(8,662)	(9,221)	(10,808)
Amortization of prior service cost (credit)	0	0	0
Amortization of net loss	1,828	1,755	1,784
Settlement charge	0	0	0
Net periodic benefit cost (benefit)	(76)	(110)	(1,494)
Retirement Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	73	80	133
Interest cost	62	71	75
Expected return of plan assets	0	0	0
Amortization of prior service cost (credit)	(1,602)	(1,602)	(1,489)
Amortization of net loss	0	0	(47)
Settlement charge	0	0	0
Net periodic benefit cost (benefit)	$ (1,467)	$ (1,451)	$ (1,328)

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.25%	3.70%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.70%	4.25%
Expected long-term rate of return on plan assets	4.94%	5.51%
Retirement Health and Life Insurance Benefits
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.75%	3.25%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.25%	3.25%
Expected long-term rate of return on plan assets	0.00%	0.00%

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (One-Percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract]
Effect on total service and interest cost - Increase	$ 8
Effect on total service and interest cost - Decrease	(8)
Effect on other postretirement benefit obligations - Increase	65
Effect on other postretirement benefit obligations - Decrease	$ (60)

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 191,652	$ 180,056	$ 171,778
Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,691	6,223
Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	187,601	167,544
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,360	6,289
Pooled separate accounts
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,216	4,610
Pooled separate accounts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pooled separate accounts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,216	4,610
Pooled separate accounts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Fixed income bonds
Defined Benefit Plan Disclosure [Line Items]
Pension assets	186,385	162,934
Fixed income bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Fixed income bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	186,385	162,934
Fixed income bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,691	6,223
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,691	6,223
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,360	6,289
Guaranteed deposit account | Level 1
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account | Level 2
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Guaranteed deposit account | Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 1,360	$ 6,289

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Summary of Changes in Fair Value of Guaranteed Deposit Account's Level 3 Assets) (Details) - Pension Benefits - Guaranteed deposit account - Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of year	$ 6,289
Change in unrealized gain (loss)	(194)
Purchases, sales, issuances and settlements (net)	(4,735)
Balance at end of year	$ 1,360

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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Estimated Future Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2019	$ 9,500
2020	9,597
2021	9,818
2022	10,038
2023	10,228
2024-2028	53,901
Retirement Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
2019	334
2020	265
2021	171
2022	134
2023	151
2024-2028	$ 825

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Commitments and Contingencies (Additional Information) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) claims	Dec. 31, 2017 USD ($) claims	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Number of claims dismissed | claims	192	258
Number of claims settled | claims	25	22
Claims settlements amount	$ 7.1	$ 5.0
Projection period (years)	40 years	10 years
Asbestos-related claims	$ 70.3	$ 76.2
Recorded third-party environmental recoveries receivable	63.8	69.2
Environmental remediation expense (income)	$ 0.7	$ 3.4	$ 0.3
Minimum
Loss Contingencies [Line Items]
Operating lease period	1 year
Maximum
Loss Contingencies [Line Items]
Operating lease period	5 years
Connecticut Voluntary Corrective Action Program
Loss Contingencies [Line Items]
Environmental remediation expense	$ 0.7
Estimated total cleanup costs, accrual	$ 1.7

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Commitments and Contingencies (Operating Leases) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 543
2020	525
2021	4,276
2022	0
2023	0
Thereafter	0
Total	5,344
Less: Interest	(295)
Present Value of Net Future Minimum Lease Payments	$ 5,049

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Commitments and Contingencies (Capital Leases) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	$ 3,951
2020	3,052
2021	2,216
2022	1,507
2023	491
Thereafter	0
Total	$ 11,217

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Commitments and Contingencies (Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating Leases	$ 3,850	$ 3,819	$ 3,567
Capital Leases	$ 472	$ 608	$ 564

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Commitments and Contingencies (Claims for Asbestos) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) claims	Dec. 31, 2017 claims
Commitments and Contingencies Disclosure [Abstract]
Indemnity and defense costs | $	$ 1.2
Claims outstanding at beginning of year	687	605
New claims filed	275	362
Pending claims concluded	(217)	(280)
Claims outstanding at end of year	745	687

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Commitments and Contingencies (Schedule to Total Estimated of Liability for Asbestos) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Asbestos-related claims	$ 70.3	$ 76.2
Asbestos-related insurance receivables	$ 63.8	$ 69.2

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Income Taxes (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Tax credit carryforwards, research	$ 8,300	$ 8,300
Deferred tax asset valuation allowance	16,889	16,889	$ 8,754	$ 6,388	$ 6,202
Current foreign tax expense (benefit)		26,604	$ 27,418	24,537
Tax credit carryforwards, AMT	500	$ 500
Effective income tax rate		20.70%	39.50%
Deferred tax liabilities, undistributed foreign earnings	1,800	$ 1,800	$ 3,100
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)	200	200
Provisional income tax benefit		7,500
Change in tax rate, deferred tax asset, provisional income tax expense		7,700
Unrecognized tax benefits that would impact effective tax rate	9,600	9,600
Unrecognized tax benefits that would result in adjustments to other tax accounts	200	200
Unrecognized tax benefits, income tax penalties and interest accrued	500	500	600
Unrecognized tax benefits, income tax penalties and interest expense (benefit)		(100)	200	$ (900)
Minimum amount of unrecognized tax benefits that could be recognized over next 12 months	1,800	1,800
Arizona
Income Tax Examination [Line Items]
State operating loss carryforwards	8,400	8,400
State and Local Jurisdiction
Income Tax Examination [Line Items]
Deferred tax asset valuation allowance	16,900	16,900	8,800
Minimum
Income Tax Examination [Line Items]
State operating loss carryforwards	3,700	3,700
Maximum
Income Tax Examination [Line Items]
State operating loss carryforwards	6,100	6,100
China
Income Tax Examination [Line Items]
Current foreign tax expense (benefit)		3,700
Deferred tax liabilities, undistributed foreign earnings	$ 1,800	$ 1,800	$ 3,100

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Income Taxes (Consolidated Income (Loss) from Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 14,381	$ 39,751	$ 10,888
International	96,208	93,174	71,392
Total	$ 110,589	$ 132,925	$ 82,280

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Income Taxes (Income Tax Expense (Benefit) in the Consolidated Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Domestic	$ (341)	$ 7,535	$ 2,078
International	26,604	27,418	24,537
Total	26,263	34,953	26,615
Deferred
Domestic	(3,007)	21,936	3,376
International	(318)	(4,423)	4,006
Total	(3,325)	17,513	7,382
Domestic	(3,348)	29,471	5,454
International	26,286	22,995	28,543
Total	$ 22,938	$ 52,466	$ 33,997

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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Accrued employee benefits and compensation	$ 4,269	$ 8,410
Tax loss and credit carryforwards	18,604	7,905
Reserves and accruals	4,935	4,699
Other	1,953	2,977
Total deferred tax assets	29,761	23,991
Less deferred tax asset valuation allowance	(16,889)	(8,754)	$ (6,388)	$ (6,202)
Total deferred tax assets, net of valuation allowance	12,872	15,237
Deferred tax liabilities
Depreciation and amortization	8,335	14,300
Postretirement benefit obligations	3,234	2,311
Unremitted earnings	1,778	3,100
Other	2,094	224
Total deferred tax liabilities	15,441	19,935
Net deferred tax asset (liability)	$ (2,569)	$ (4,698)

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Income Taxes (Income Tax Expense Difference) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax expense at Federal statutory income tax rate	$ 23,224	$ 46,529	$ 28,798
International tax rate differential	826	(9,603)	(2,260)
Foreign source income, net of tax credits (excluding U.S. Tax Reform)	(197)	1,087	1,215
State tax, net of federal	121	279	(200)
Unrecognized tax benefits	(869)	2,874	(5,555)
U.S. Tax Reform	209	13,683	0
Equity compensation excess tax deductions	(2,238)	(3,867)	0
General business credits	(2,172)	(1,080)	(1,125)
Distribution related foreign taxes	1,916	2,173	12,433
Valuation allowance change (excluding U.S. Tax Reform)	602	1,393	171
Other	1,516	(1,002)	520
Total	$ 22,938	$ 52,466	$ 33,997

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Income Taxes (Reconciliation of Unrecognized Tax Benefits, Excluding Potential Interest and Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 14,565	$ 5,883
Gross increases - current period tax positions	2,583	7,056
Gross increases - tax positions in prior periods	505	3,243
Gross decreases - tax positions in prior periods	0	(375)
Foreign currency exchange	(142)	467
Lapse of statute of limitations	(7,710)	(1,709)
Ending balance	$ 9,801	$ 14,565

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Operating Segments and Geographic Information (Information About Reportable Segments) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 222,942	$ 226,863	$ 214,675	$ 214,611	$ 209,008	$ 206,783	$ 201,424	$ 203,828	$ 879,091	$ 821,043	$ 656,314
Operating income									112,711	129,139	80,897
Total assets	1,279,344				1,125,134				1,279,344	1,125,134	1,056,500
Capital expenditures									47,115	27,215	18,136
Capital expenditures, excluding ISOLA acquisition									90,549
Depreciation & amortization									50,073	44,099	37,847
Investment in unconsolidated joint ventures	18,667				18,324				18,667	18,324	16,183
Equity income in unconsolidated joint ventures									5,501	4,898	4,146
Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									294,154	301,092	277,787
Operating income									33,827	55,410	42,455
Total assets	396,075				353,786				396,075	353,786	361,746
Capital expenditures										9,900	7,569
Capital expenditures, excluding ISOLA acquisition									61,425
Depreciation & amortization									20,121	16,351	15,654
Investment in unconsolidated joint ventures	0				0				0	0	0
Equity income in unconsolidated joint ventures									0	0	0
Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									341,364	312,661	203,181
Operating income									52,502	50,908	25,884
Total assets	588,841				489,456				588,841	489,456	421,011
Capital expenditures										7,563	4,051
Capital expenditures, excluding ISOLA acquisition									10,917
Depreciation & amortization									18,501	16,270	10,141
Investment in unconsolidated joint ventures	18,667				18,324				18,667	18,324	16,183
Equity income in unconsolidated joint ventures									5,501	4,898	4,146
Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									223,338	184,954	152,367
Operating income									19,648	15,668	5,229
Total assets	273,212				261,034				273,212	261,034	247,187
Capital expenditures										9,238	6,009
Capital expenditures, excluding ISOLA acquisition									18,051
Depreciation & amortization									10,640	10,572	11,208
Investment in unconsolidated joint ventures	0				0				0	0	0
Equity income in unconsolidated joint ventures									0	0	0
Other
Segment Reporting Information [Line Items]
Net sales									20,235	22,336	22,979
Operating income									6,734	7,153	7,329
Total assets	21,216				20,858				21,216	20,858	26,556
Capital expenditures										514	507
Capital expenditures, excluding ISOLA acquisition									156
Depreciation & amortization									811	906	844
Investment in unconsolidated joint ventures	$ 0				$ 0				0	0	0
Equity income in unconsolidated joint ventures									0	$ 0	$ 0
Transferred over Time
Segment Reporting Information [Line Items]
Net sales									244,657
Transferred over Time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									0
Transferred over Time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									5,788
Transferred over Time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									221,896
Transferred over Time | Other
Segment Reporting Information [Line Items]
Net sales									16,973
Transferred at a point in time
Segment Reporting Information [Line Items]
Net sales									634,434
Transferred at a point in time | Advanced Connectivity Solutions
Segment Reporting Information [Line Items]
Net sales									294,154
Transferred at a point in time | Elastomeric Material Solutions
Segment Reporting Information [Line Items]
Net sales									335,576
Transferred at a point in time | Power Electronics Solutions
Segment Reporting Information [Line Items]
Net sales									1,442
Transferred at a point in time | Other
Segment Reporting Information [Line Items]
Net sales									$ 3,262

XML

Operating Segments and Geographic Information (Revenue by Country) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net sales	$ 222,942	$ 226,863	$ 214,675	$ 214,611	$ 209,008	$ 206,783	$ 201,424	$ 203,828	$ 879,091	$ 821,043	$ 656,314
Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									294,154	301,092	277,787
Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									341,364	312,661	203,181
Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									223,338	184,954	152,367
Other
Disaggregation of Revenue [Line Items]
Net sales									20,235	22,336	22,979
United States
Disaggregation of Revenue [Line Items]
Net sales									246,797	225,398	139,237
United States | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									52,661	48,277	46,951
United States | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									152,284	141,508	61,188
United States | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									37,325	30,403	25,599
United States | Other
Disaggregation of Revenue [Line Items]
Net sales									4,527	5,210	5,499
Other Americas
Disaggregation of Revenue [Line Items]
Net sales									19,261	14,507	10,925
Other Americas | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									3,104	2,946	2,035
Other Americas | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									14,453	9,709	7,722
Other Americas | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									931	1,153	313
Other Americas | Other
Disaggregation of Revenue [Line Items]
Net sales									773	699	855
Total Americas
Disaggregation of Revenue [Line Items]
Net sales									266,058	239,905	150,162
Total Americas | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									55,765	51,223	48,986
Total Americas | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									166,737	151,217	68,910
Total Americas | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									38,256	31,556	25,912
Total Americas | Other
Disaggregation of Revenue [Line Items]
Net sales									5,300	5,909	6,354
China
Disaggregation of Revenue [Line Items]
Net sales									282,091	273,391	241,203
China | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									136,315	143,065	137,695
China | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									101,036	93,039	77,033
China | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									39,781	32,164	20,964
China | Other
Disaggregation of Revenue [Line Items]
Net sales									4,959	5,123	5,511
Other APAC
Disaggregation of Revenue [Line Items]
Net sales									135,412	125,576	103,840
Other APAC | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									63,318	64,077	53,082
Other APAC | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									40,788	36,233	29,109
Other APAC | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									28,414	21,845	17,751
Other APAC | Other
Disaggregation of Revenue [Line Items]
Net sales									2,892	3,421	3,898
Total APAC
Disaggregation of Revenue [Line Items]
Net sales									417,503	398,967	345,043
Total APAC | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									199,633	207,142	190,777
Total APAC | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									141,824	129,272	106,142
Total APAC | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									68,195	54,009	38,715
Total APAC | Other
Disaggregation of Revenue [Line Items]
Net sales									7,851	8,544	9,409
Germany
Disaggregation of Revenue [Line Items]
Net sales									91,015	88,606	81,738
Germany | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									18,165	23,925	19,842
Germany | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									9,907	9,211	7,621
Germany | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									62,359	54,813	53,426
Germany | Other
Disaggregation of Revenue [Line Items]
Net sales									584	657	849
Other EMEA
Disaggregation of Revenue [Line Items]
Net sales									104,515	93,565	79,371
Other EMEA | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									20,591	18,802	18,182
Other EMEA | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									22,896	22,961	20,508
Other EMEA | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									54,528	44,576	34,314
Other EMEA | Other
Disaggregation of Revenue [Line Items]
Net sales									6,500	7,226	6,367
Total EMEA
Disaggregation of Revenue [Line Items]
Net sales									195,530	182,171	161,109
Total EMEA | Advanced Connectivity Solutions
Disaggregation of Revenue [Line Items]
Net sales									38,756	42,727	38,024
Total EMEA | Elastomeric Material Solutions
Disaggregation of Revenue [Line Items]
Net sales									32,803	32,172	28,129
Total EMEA | Power Electronics Solutions
Disaggregation of Revenue [Line Items]
Net sales									116,887	99,389	87,740
Total EMEA | Other
Disaggregation of Revenue [Line Items]
Net sales									$ 7,084	$ 7,883	$ 7,216

XML

Operating Segments and Geographic Information (Operations by Geographic Area) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 684,652	$ 576,996	$ 522,894
United States
Segment Reporting Information [Line Items]
Long-Lived Assets	476,560	370,964	326,199
China
Segment Reporting Information [Line Items]
Long-Lived Assets	58,205	57,404	62,728
Germany
Segment Reporting Information [Line Items]
Long-Lived Assets	113,412	114,497	101,725
Other
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 36,475	$ 34,131	$ 32,242

XML

Revenue from Contracts with Customers (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 776,403		$ 684,540
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		$ 688,752
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 5,313	$ 4,212

XML

Revenue from Contracts with Customers (Contract Assets) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	$ 22,728
Advanced Connectivity Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	0
Elastomeric Material Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	943
Power Electronics Solutions
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	19,738
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract Assets	$ 2,047

XML

Revenue from Contracts with Customers (Impact of Adoption of Accounting Principles) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Consolidated Statements of Financial Position:
Contract assets	$ 22,728				$ 0				$ 22,728	$ 0
Inventories	132,637				112,557				132,637	112,557
Deferred income taxes	10,806								10,806
Retained earnings	776,403				684,540				776,403	684,540
Consolidated Statements of Operations:
Net sales	222,942	$ 226,863	$ 214,675	$ 214,611	209,008	$ 206,783	$ 201,424	$ 203,828	879,091	821,043	$ 656,314
Cost of sales									568,308	502,468	406,829
Income tax expense									22,938	52,466	33,997
Net income									$ 87,651	$ 80,459	$ 48,283
Basic earnings per share (in dollars per share)									$ 4.77	$ 4.43	$ 2.68
Diluted earnings per share (in dollars per share)									$ 4.70	$ 4.34	$ 2.65
Consolidated Statements of Cash Flows:
Deferred income taxes									$ (3,325)	$ 17,513	$ 7,382
Contract assets									(22,728)	0	0
Inventories									(19,013)	(14,208)	9,689
Other, net									991	5,885	(4,715)
Net cash provided by operating activities									66,820	138,982	$ 116,967
Accounting Standards Update 2014-09
Consolidated Statements of Financial Position:
Contract assets												$ 18,099
Inventories												100,250
Deferred income taxes												12,286
Retained earnings												688,752
Calculated under Revenue Guidance in Effect before Topic 606
Consolidated Statements of Financial Position:
Contract assets	0								0
Inventories	148,092								148,092
Deferred income taxes	8,846								8,846
Retained earnings	771,090								771,090
Consolidated Statements of Operations:
Net sales									874,462
Cost of sales									565,160
Income tax expense									22,558
Net income									$ 86,550
Basic earnings per share (in dollars per share)									$ 4.71
Diluted earnings per share (in dollars per share)									$ 4.64
Consolidated Statements of Cash Flows:
Deferred income taxes									$ (3,705)
Contract assets									0
Inventories									(34,468)
Other, net									(4,801)
Net cash provided by operating activities									66,820
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09
Consolidated Statements of Financial Position:
Contract assets					0					0
Inventories					112,557					112,557
Deferred income taxes					10,706					10,706
Retained earnings					$ 684,540					$ 684,540
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Consolidated Statements of Financial Position:
Contract assets	22,728								22,728			18,099
Inventories	(15,455)								(15,455)			(12,307)
Deferred income taxes	1,960								1,960			1,580
Retained earnings	$ 5,313								5,313			$ 4,212
Consolidated Statements of Operations:
Net sales									4,629
Cost of sales									3,148
Income tax expense									380
Net income									$ 1,101
Basic earnings per share (in dollars per share)									$ 0.06
Diluted earnings per share (in dollars per share)									$ 0.06
Consolidated Statements of Cash Flows:
Deferred income taxes									$ 380
Contract assets									(22,728)
Inventories									15,455
Other, net									5,792
Net cash provided by operating activities									$ 0

XML

Restructuring and Impairment Charges (Additional Information) (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 24, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Accrued capital additions				$ 2,744	$ 2,376	$ 1,081
Impairment charges				1,506	807	0
Isola asset acquisition
Restructuring Cost and Reserve [Line Items]
Impairment charges				1,500
Brightvolt, Inc.
Restructuring Cost and Reserve [Line Items]
Impairment charges			$ 300
ROLINX
Restructuring Cost and Reserve [Line Items]
Impairment charges		$ 500
Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring charges				600	2,800	700
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges				100	$ 400	$ 600
Severance and other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges				186
Fair value of restructuring charges				1,100
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,000			546
Severance costs	$ 500
Accrued capital additions				$ 1,600

XML

Restructuring and Impairment Charges (Schedule of Restructuring Charges) (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 24, 2018	Dec. 31, 2018
Severance and other related costs
Restructuring Reserve [Roll Forward]
Balance at December 31, 2017		$ 183
Provisions		186
Payments		(264)
Balance as of December 31, 2018		105
Facility Closing
Restructuring Reserve [Roll Forward]
Balance at December 31, 2017		0
Provisions	$ 2,000	546
Payments		(23)
Balance as of December 31, 2018		$ 523

XML

Restructuring and Impairment Charges (Restructuring and Impairment Charges) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Impairment
Total Restructuring and Impairment Charges	$ 4,038	$ 3,567	$ 734
Advanced Connectivity Solutions | Severance and other related costs
Restructuring and Impairment
Total Restructuring and Impairment Charges	244	1,305	375
Advanced Connectivity Solutions | Allocated impairment charges
Restructuring and Impairment
Total Restructuring and Impairment Charges	1,506	161	0
Elastomeric Material Solutions | Severance and other related costs
Restructuring and Impairment
Total Restructuring and Impairment Charges	2,152	834	176
Elastomeric Material Solutions | Allocated impairment charges
Restructuring and Impairment
Total Restructuring and Impairment Charges	0	103	0
Power Electronics Solutions | Severance and other related costs
Restructuring and Impairment
Total Restructuring and Impairment Charges	136	621	183
Power Electronics Solutions | Allocated impairment charges
Restructuring and Impairment
Total Restructuring and Impairment Charges	$ 0	$ 543	$ 0

XML

Supplemental Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Gain from antitrust litigation settlement	$ (4,231)	$ 0	$ 0
Gain on sale of property, plant and equipment	(3,087)	(5,329)	0
Lease income	(948)	0	0
Depreciation on leased assets	3,512	0	0
Indemnity claim settlement from acquisitions	(700)	0	0
Economic incentive grants	(556)	0	0
Other operating income (expense)	(3,087)	(5,329)	0
Global Headquarters Move
Condensed Financial Statements, Captions [Line Items]
Gain on sale of property, plant and equipment	$ (164)	$ (5,329)	$ 0

XML

Recent Accounting Standards - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense	$ 200	$ 200
Selling, general and administrative expenses		$ 164,046	$ 161,651	$ 139,272
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Selling, general and administrative expenses			$ (1,600)	$ (3,000)
Minimum | Subsequent Event | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset					$ 9,000
Operating lease, liability					9,000
Maximum | Subsequent Event | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset					11,000
Operating lease, liability					$ 11,000

XML

Quarterly Results of Operations (Unaudited) (Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 222,942	$ 226,863	$ 214,675	$ 214,611	$ 209,008	$ 206,783	$ 201,424	$ 203,828	$ 879,091	$ 821,043	$ 656,314
Gross margin	78,375	79,130	76,672	76,606	75,491	82,188	80,546	80,350	$ 310,783	$ 318,575	$ 249,485
Net income	$ 24,452	$ 19,734	$ 17,329	$ 26,136	$ 6,999	$ 25,532	$ 20,896	$ 27,032
Net income per share:
Basic (in dollars per share)	$ 1.33	$ 1.07	$ 0.94	$ 1.43	$ 0.38	$ 1.40	$ 1.15	$ 1.50
Diluted (in dollars per share)	$ 1.31	$ 1.06	$ 0.93	$ 1.40	$ 0.37	$ 1.37	$ 1.13	$ 1.47

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Share Repurchases (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2015
Equity [Abstract]
Stock repurchase program, authorized amount		$ 100,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 49,000,000

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Share Repurchases (Schedule of Shares of Common Stock Through the Repurchase Program) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Shares of capital stock repurchased (in shares)	23,138	0
Value of capital stock repurchased	$ 2,999	$ 0	$ 7,995

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SCHEDULE II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts
Balance at Beginning of Period	$ 1,525	$ 1,952	$ 695
Charged to (Reduction of) Costs and Expenses	189	(275)	1,321
Taken Against Allowance	(360)	(152)	(64)
Other (Deductions) Recoveries	0	0	0
Balance at End of Period	1,354	1,525	1,952
Valuation on Allowance for Deferred Tax Assets
Balance at Beginning of Period	8,754	6,388	6,202
Charged to (Reduction of) Costs and Expenses	8,135	2,366	186
Taken Against Allowance	0	0	0
Other (Deductions) Recoveries	0	0	0
Balance at End of Period	$ 16,889	$ 8,754	$ 6,388