10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 2014

Commission File Number 000-29472

Amkor Technology, Inc.

(Exact name of registrant as specified in its charter)

Delaware (State of incorporation) 23-1722724 (I.R.S. Employer Identification Number)

2045 East Innovation Circle

Tempe, AZ 85284

(480) 821-5000

(Address of principal executive offices and zip code)

1900 South Price Road

Chandler, AZ 85286

(Former address of principal executive offices and zip code)

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, $0.001 par value	The NASDAQ Global Select Market

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 þ     No o

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 o     No þ

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, as amended, 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 þ     No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes þ     No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K 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.  þ

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

Large accelerated filer þ	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
	(Do not check if a smaller reporting company)

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

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2014, based upon the closing price of the common stock as reported by the NASDAQ Global Select Market on that date, was approximately $1,102.6 million.

The number of shares outstanding of each of the issuer’s classes of common equity, as of January 30, 2015, was as follows: 237,283,749 shares of Common Stock, $0.001 par value.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the registrant’s Proxy Statement relating to its 2015 Annual Meeting of Stockholders, to be filed subsequently, are incorporated by reference into Part III of this Report where indicated.

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business	3
Item 1A.	Risk Factors	16
Item 1B.	Unresolved Staff Comments	32
Item 2.	Properties	32
Item 3.	Legal Proceedings	33
Item 4.	Mine Safety Disclosures	33
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	33
Item 6.	Selected Consolidated Financial Data	36
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	49
Item 8.	Financial Statements and Supplementary Data	51
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	88
Item 9A.	Controls and Procedures	88
Item 9B.	Other Information	89
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	89
Item 11.	Executive Compensation	89
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	90
Item 13.	Certain Relationships and Related Transactions and Director Independence	90
Item 14.	Principal Accountant Fees and Services	90
PART IV
Item 15.	Exhibits and Financial Statement Schedules	90

All references in this Annual Report on Form 10-K to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and its subsidiaries. We refer to the Republic of Korea, which is also commonly known as South Korea, as “Korea”. All references to "J-Devices" and "Toshiba" are to J-Devices Corporation and Toshiba Corporation, respectively. We also refer to our new factory and research and development facility in Korea as "K5". Amounts preceded by ¥ are in Japanese yen. Amkor^®, Amkor Technology^®, ChipArray^®, FlipStack^®, FusionQuad^®, MicroLeadFrame^® and TMV^® are registered trademarks of Amkor Technology, Inc. All other trademarks appearing herein are held by their respective owners. Subsequent use of the above registered trademarks in this report may occur without the respective superscript symbol (^®) in order to facilitate the readability of the report and are not a waiver of any rights that may be associated with the relevant trademarks.

This report contains forward-looking statements within the meaning of the federal securities laws, including but not limited to statements regarding: (1) the amount, timing and focus of our expected capital investments in 2015 including expenditures in support of customer demand in the mobile communications market and expenditures related to our new factory and research and development facility in Korea, (2) our ability to fund our operating activities for the next twelve months, (3)

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the effect of changes in capacity utilization on our gross margin, (4) the focus of our research and development activities, (5) the expiration of tax holidays in jurisdictions in which we operate and expectations regarding our effective tax rate, (6) the release of valuation allowances related to taxes in the future, (7) our repurchase or repayment of outstanding debt or the conversion of debt in the future, (8) payment of dividends, (9) compliance with our covenants, (10) expected contributions to foreign pension plans, (11) liability for unrecognized tax benefits and the potential impact of our unrecognized tax benefits on our effective tax rate, (12) the effect of foreign currency exchange rate exposure on our financial results, (13) the volatility of the trading price of our common stock, (14) changes to our internal controls related to integration of acquired operations and implementation of an enterprise resource planning (“ERP”) system, (15) the anticipated schedule for construction of our new factory and research and development facility in Korea, (16) our plan to increase our ownership of J-Devices and consolidation of J-Devices' results into our consolidated financial statements, (17) our efforts to enlarge our customer base in certain geographic areas and markets, (18) demand for advanced packages in mobile devices and our technology leadership and potential growth in this market and (19) our expected forfeiture rate for outstanding stock options and restricted shares, (20) our expected rate of return for pension plan assets and (21) other statements that are not historical facts. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” “intend” or the negative of these terms or other comparable terminology. Because such statements include risks and uncertainties, actual results may differ materially from those anticipated in such forward-looking statements as a result of various factors, including those set forth in the following report as well as in Part I, Item 1A of this Annual Report on Form 10-K.

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PART I

Item 1. Business

OVERVIEW

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Amkor pioneered the outsourcing of semiconductor packaging and test services through a predecessor corporation in 1968, and over the years we have built a leading position by:

• Designing and developing innovative packaging and test technologies;

• Offering a broad portfolio of cost-effective solutions and services;

• Successfully penetrating strategic end markets which offer solid growth prospects;

• Cultivating long-standing relationships with our customers, which include many of the world’s leading semiconductor companies;

• Collaborating with customers, original equipment manufacturers (“OEMs”) and equipment and material suppliers;

• Developing a competitive cost structure with disciplined capital investment;

• Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution and

• Having a diversified operational scope with research and development, engineering and production capabilities at various facilities throughout China, Japan, Korea, Malaysia, the Philippines and Taiwan.

Our packaging and test services are designed to meet application and chip specific requirements including the type of interconnect technology employed; size; thickness and electrical, mechanical and thermal performance. We are able to provide turnkey packaging and test services including semiconductor wafer bump, wafer probe, wafer backgrind, package design, packaging, test and drop shipment services. Our customers will use us for one or more of these services.

We provide our services to integrated device manufacturers (“IDMs”), “fabless” semiconductor companies and contract foundries. IDMs generally design, manufacture, package and test semiconductors in their own facilities. However, the availability of technologically advanced outsourced manufacturing services has encouraged IDMs to increasingly outsource their manufacturing service needs. Fabless semiconductor companies do not have factories and focus exclusively on the semiconductor design process and outsource virtually every step of the manufacturing process. Fabless semiconductor companies utilize contract foundries to manufacture their semiconductors in wafer form, and companies such as Amkor for their packaging and test needs. Some companies will engage a contract foundry to manage the complete semiconductor manufacturing process, and in turn, the contract foundry will outsource some of its packaging and test needs.

Our IDM customers include: Intel Corporation; Micron Technology, Inc.; STMicroelectronics N.V.; Texas Instruments Incorporated and Toshiba Corporation. Our fabless customers include: Altera Corporation; Avago Technologies; Broadcom Corporation and Qualcomm Incorporated. Our contract foundry customers include: GlobalFoundries Inc. and Taiwan Semiconductor Manufacturing Company Limited.

AVAILABLE INFORMATION

Amkor files annual, quarterly and current reports, proxy statements and other information with the U.S. Securities and Exchange Commission (the “SEC”). You may read and copy any document we file at the SEC’s Public Reference Room, 100 F Street, NE, Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for information on the Public Reference Room. The SEC maintains a web site that contains annual, quarterly and current reports, proxy statements and other information that issuers (including Amkor) file electronically with the SEC. The SEC’s web site is http://www.sec.gov.

Amkor’s web site is http://www.amkor.com. Amkor makes available free of charge through its web site, our annual reports on Form 10-K; quarterly reports on Form 10-Q; current reports on Form 8-K; Forms 3, 4 and 5 filed on behalf of directors

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and executive officers and any amendments to those reports filed or furnished pursuant to the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. We also make available, free of charge, through our web site, our Corporate Governance Guidelines, the charters of the Audit Committee, Nominating and Governance Committee and Compensation Committee of our Board of Directors, our Code of Business Conduct, our Code of Ethics for Directors and other information and materials. The information on Amkor’s web site is not incorporated by reference into this report.

INDUSTRY BACKGROUND

Semiconductor devices are the essential building blocks used in most electronic products. As electronic and semiconductor devices have evolved, several important trends have emerged that have fueled the growth of the overall semiconductor industry, as well as the market for outsourced semiconductor packaging and test services. These trends include:

• An increasing demand for mobile and internet-connected devices, including world-wide adoption of mobile “smart” phones and tablets that can access the internet and provide multimedia capabilities. The demand for digital video content has driven a range of higher performance internet connected home and mobile consumer electronics products including the rapidly growing smartphone and tablet categories.

• An increase in mobility and connectivity capabilities and growing digital content driving demand for new broadband wired and wireless networking equipment.

• The proliferation of semiconductor devices into well established end products such as automotive systems due to increased use of electronics for safety, navigation, fuel efficiency, emission reduction and entertainment systems.

• An overall increase in the semiconductor content within electronic products to provide greater functionality and higher levels of performance.

Our business is impacted by market conditions in the semiconductor industry, which is cyclical by nature and impacted by broad economic factors, such as world-wide gross domestic product and consumer spending. Historical trends indicate there has been a strong correlation between world-wide gross domestic product levels, consumer spending and semiconductor industry cycles.

Outsourcing Trends in Semiconductor Manufacturing

Semiconductor companies outsource their packaging and test needs to service providers such as Amkor for the following reasons:

Packaging and test service providers have developed expertise in advanced technologies.

Semiconductor packaging and test technologies continue to become more sophisticated, complex and customized due to increasing demands for miniaturization, greater functionality, lower power consumption and improved thermal and electrical performance. This trend has led many semiconductor companies and OEMs to view packaging and test as enabling technologies requiring sophisticated expertise and technological innovation. Many of these companies are also relying on packaging and testservice providers as key sources for new package designs and advanced interconnect technologies, thereby enabling them to reduce their internal research and development costs.

Packaging and test service providers offer a cost effective solution in a highly cyclical, capital intensive industry.

The semiconductor industry is cyclical by nature and impacted by broad economic factors, such as changes in world wide gross domestic product and consumer spending. Semiconductor packaging and test are complex processes requiring substantial investment in specialized equipment, factories and human resources. As a result of this cyclicality and the large investments required, manufacturing facilities must operate at consistently high levels of utilization to be cost effective. Shorter product life cycles, coupled with the need to update or replace packaging and test equipment to accommodate new package types, make it more difficult for integrated semiconductor companies to maintain cost effective utilization of their packaging and test assets throughout semiconductor industry cycles. Packaging and test service providers, on the other hand, can typically use their assets to support a broad range of customers, potentially generating more efficient use of their production assets and a more cost effective solution.

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Packaging and test service providers can facilitate a more efficient supply chain and help shorten time-to-market for new products.

We believe that semiconductor companies, together with their customers, are seeking to shorten the time-to-market for their new products, and that having an effective supply chain is a critical factor in facilitating timely and successful product introductions. Packaging and test service providers have the resources and expertise to timely develop their capabilities and implement new packaging technology in volume. For this reason, semiconductor companies and OEMs are leveraging capabilities of packaging and test service providers to deliver their new products to market more quickly.

High quality packaging and test service providers enable semiconductor manufacturers to focus their resources on semiconductor design and wafer fabrication.

As semiconductor process technology migrates to larger wafers and smaller feature sizes, the cost of building a state-of-the-art wafer fabrication factory has risen significantly and can now be several billions of dollars. The high cost of investing in next generation silicon technology and equipment is causing many semiconductor companies to adopt or maintain a “fabless” or “fab-lite” strategy to reduce or eliminate their investment in wafer fabrication and associated packaging and test operations. As a result, these companies are increasing their reliance on outsourced providers of semiconductor manufacturing services, including packaging and test.

STRATEGY AND COMPETITIVE STRENGTHS

Strategy

Our financial goals are sales growth and improved profitability, and we are focusing on the following strategies to achieve these goals:

Leverage Our Investment in Services for Advanced Technologies

We are an industry leader in developing and commercializing cost-effective advanced packaging and test technologies. These advanced technology solutions provide increased value to our customers while typically generating gross margins above our corporate average. This is particularly true in the mobile device market, where growth has outpaced the semiconductor industry rate. The key to success in the advanced packaging and test area is to generate reasonably quick returns on investments made for customers seeking leading edge technologies.

In recent years we have made significant investments in state-of-the-art facilities and equipment to provide services for the industry’s most complex devices. With approximately 400 employees engaged in research and development focusing on the design and development of new semiconductor packaging and test technologies, we are a technology leader in areas such as fine pitch bumping, advanced flip chip and wafer-level processing. During 2014, we had success capitalizing on our advanced technology to achieve design wins and new product introductions in areas such as chips fabricated at 20 nanometer geometries, fingerprint sensors and radio frequency (RF) system-in-package devices. We are also making substantial progress with 2.5D and 3D interconnect solutions that stack multiple active chips in a single package, as we work closely with our customers to develop cost-effective leading-edge packages for the next generation of devices.

We believe that the value added by advanced packaging services will continue to grow as our customers and leading electronics OEMs strive for smaller device geometries, higher levels of speed and performance and lower power consumption. We intend to continue to leverage our investment in advanced technology to meet the demand for these services.

Improve Utilization of Existing Assets

Another key to our success is to improve the utilization of our existing assets. The transition by leading edge customers to newer packaging and test equipment and platforms typically frees up capacity in existing, previously installed equipment. As part of our strategy, we are focused on developing a second wave of customers to more effectively utilize these assets over a longer period of time. For example, we have a concerted effort to increase our sales to Chinese and Taiwanese fabless

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chip companies, since they have a significant portion of the mid-tier and entry-level segments of the mobile device market where most of the growth is occurring.

In 2014, we made good progress in our efforts to seek out and engage new customers and deepen our engagements with existing customers. This includes expanded emphasis on the automotive market where semiconductor content continues to grow, and in the analog area for our mainstream wirebond technologies. These efforts to enlarge our customer base will continue in 2015.

Selectively Grow Our Scale and Scope through Strategic Investments

From time to time we see attractive opportunities to grow our customer base and expand markets. For example, in 2013, we acquired Toshiba’s power discrete semiconductor packaging and test factory in Malaysia. In addition to adding a new revenue stream from our then existing customer, Toshiba, we are now also servicing other customers in this factory.

We believe that selective growth through joint ventures, acquisitions and other strategic investments can help diversify our revenue streams, improve our profits and maintain our technological leadership.

Competitive Strengths

The outsourced semiconductor packaging and test market is very competitive. We also compete with the internal semiconductor packaging and test capabilities of many of our customers and foundries. We believe we are well-positioned in the outsourced packaging and test services market. The following competitive strengths allow us to build upon our industry position and to remain one of the preferred providers of semiconductor packaging and test services.

Leading Technology Innovator

We are a leader in developing advanced semiconductor packaging and test solutions. We have designed and developed several state-of-the-art package formats and technologies including our Package-on-Package (“PoP”) platform with Through Mold Via (“TMV”) technology, FusionQuad, flip chip ball grid array, multi-chip modules with a silicon interposer placed between the module chips and substrate, copper pillar bumping and fine pitch copper pillar flip chip packaging technologies. In addition, we believe that as semiconductor technology continues to achieve smaller device geometries with higher levels of speed and performance, packages will increasingly require wafer-level chip scale packaging, flip chip and three dimensional or “3D” interconnect solutions that stack multiple active chips in a single package. We have been investing in our technology leadership in wafer bumping, wafer-level processing and 3D packaging technologies. We have also been a leader in developing environmentally friendly integrated circuit packaging, which involves the elimination of lead and certain other materials.

In the area of 3D packaging, we have been a market and technology leader in both stacked die, such as stacked chip scale packages and FlipStack, and stacked package technologies such as PoP and TMV. The semiconductor industry is now in a period of 3D packaging development where Through Silicon Via (“TSV”) interconnect technology will be used to create 3D integrated circuits. An alternative approach to full 3D stacking is to place active die on a passive silicon interposer, which in turn is placed on the package substrate. The use of a silicon interposer is often referred to as a “2.5D” packaging solution. We continue to invest in developing the key processes and packaging and test technologies required for our customers to deliver 2.5D and 3D solutions to market. We are a leader in wafer thinning, micro-bumping and TSV-based flip chip innovation, and we are leveraging our technology development relationships with key customers in diverse applications to develop and deploy new 2.5D and 3D packaging and test solutions with high density TSV interconnections.

Long-Standing Relationships and Collaboration with Prominent Semiconductor Companies

Our customers include most of the world’s largest semiconductor companies and over the last four decades, we have developed long-standing relationships with many of these companies. We believe that our production excellence has been a key factor in our success in attracting and retaining customers. We work with our customers and our suppliers to develop proprietary process technologies to enhance our existing capabilities, reduce time-to-market, increase quality and lower costs.

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We believe that our focus on research and product development will enable us to enter new markets early, capture market share and promote the adoption of our new package designs as industry standards. We collaborate with customers and leading OEMs to develop comprehensive packaging solutions that make it easier for next-generation semiconductors to be designed into next-generation end products. By collaborating with leading semiconductor companies and OEM electronic companies, we gain access to technology roadmaps for next generation semiconductor designs and obtain the opportunity to develop new packages that satisfy their future requirements.

Broad Offering of Semiconductor Package Design, Packaging and Test Services

Creating successful interconnect solutions for advanced semiconductor devices often poses unique thermal, electrical and mechanical design challenges, and we employ a large number of engineers to solve these challenges. We provide services for more than 1,000 unique products. This wide variety of packaging offerings is necessary to meet the diverse needs of our customers for the optimal combination of performance, size and cost attributes. Our solutions enable our customers to focus on semiconductor design and wafer fabrication while utilizing Amkor as their turnkey design and manufacturing provider and, in many cases, their packaging technology innovator.

We also offer an extensive line of advanced probe and final test services for analog, digital, logic, mixed signal and radio frequency semiconductor devices. We believe that the breadth of our design, packaging and test services is important to customers seeking to limit the number of their suppliers.

Geographically Diversified Operational Base

We have a broad and geographically diversified operational footprint strategically located in six countries in many of the world’s important electronics manufacturing regions. We believe that our scale and scope allow us to provide cost effective solutions to our customers by:

• Offering capacity to absorb large orders and accommodate quick turn-around times;

• Obtaining favorable pricing on materials and equipment, where possible, by using our purchasing power and leading industry position;

• Qualifying production of customer devices at multiple manufacturing sites to mitigate the risks of supply disruptions and

• Providing capabilities and solutions for customer-specific requirements.

For financial information about geographic areas, see Note 19 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

Competitive Cost Structure and Disciplined Capital Investment

There is a continuous push throughout the entire semiconductor supply chain for lower cost solutions. We work to maintain a competitive cost structure and make disciplined capital investment decisions so that we can provide cost-competitive solutions to our customers, achieve sustainable profitability and generate cash flow. Some of our cost control efforts have included: (1) improving the utilization of our existing assets; (2) increasing strip densities to drive higher throughput; (3) migrating from gold wire to copper or silver wire for certain wirebond packages and (4) increasing labor productivity.

We operate in a cyclical industry. During an industry downturn we seek to reduce our costs and drive greater factory and administrative efficiencies. Cost control efforts can include reducing labor costs by temporarily lowering compensation, reducing employee and contractor headcount, shortening work weeks and obtaining labor-related foreign government subsidies where available.

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PACKAGING AND TEST SERVICES

Overview of Semiconductor Manufacturing Process

In general, the semiconductor manufacturing process consists of integrated circuit design, wafer fabrication, wafer probe, packaging and final test.

Integrated circuit design involves the laying out of electronic components, such as transistors, resistors, capacitors and the metallic interconnect of these components, to achieve the desired device functionality. Wafer fabrication is a multiple-step sequence of photolithographic and chemical processing steps during which the integrated circuits are gradually created on semiconductor material, typically a silicon wafer. Individual integrated circuits are generally known as a “chip” or “die”, and a single wafer will contain many die. Wafers are fabricated by two types of companies - IDMs which design and fabricate wafers using their own in-house manufacturing facilities, and contract foundries which manufacture wafers that are designed by fabless companies or other customers.

The packaging and test services we provide occur subsequent to wafer fabrication. The wafers that we receive from our customers are generally consigned to us; we do not own the consigned wafers or record their value in our financial statements. During wafer probe, each individual die is electrically tested, or probed, for defects. Packaging is the processing of bare die to facilitate electrical connections and heat dissipation and protect the die. The wafer is separated into individual die. Each good die is then assembled into a package that typically encapsulates the die for protection and creates the electrical connections used to connect the package to a printed circuit board, module or other part of the electronic device. In some packages, chips are attached to a substrate or leadframe carrier through wirebonding or flip chip interconnects and then encased in a protective material. Or, for a wafer-level package, the electrical interconnections are created directly on the surface of the die (while the wafer is still intact) so that the chip may be attached directly to other parts of an electronic device without a substrate or leadframe. The packages are then tested using sophisticated equipment to ensure that each packaged chip meets its design and performance specifications.

Packaging and Test Technologies and Processes

Our packages employ wirebond, flip chip, copper clip and other interconnect technologies. We use leadframe and substrate package carriers, and we perform a variety of test services.

Interconnect Technologies

Wirebond:  In packages that employ wirebond interconnect technology, the die is mounted face up on the package carrier and the interconnections between the die and package carrier are made through very fine gold, silver or copper wires which are attached from the bond pads of the die to the package carrier. Wirebonding is generally considered to be the most cost-effective and flexible interconnect technology and is used to assemble the majority of semiconductor packages.

Flip Chip:  In packages that employ flip chip interconnect technology, the interconnections between the die and package carrier are made through conductive “bumps” that are placed directly on the die surface utilizing a process called wafer bumping. The bumped die is then “flipped over” and placed face down, with the bumps connecting directly to the package carrier. Flip chip allows a higher number of interconnects than wirebond as it uses the entire surface area of the die, and sometimes the perimeter as well, instead of just the perimeter as used by most wirebond packages. Flip chip also provides enhanced thermal and electrical performance, and enables smaller die and thinner, smaller form factors (or physical package dimensions).

The wafer bumping process consists of preparing the wafer for bumping and forming or placing the bumps. Preparation may include cleaning, removing insulating oxides and providing a pad metallurgy that will protect the interconnections while making good mechanical and electrical connection between the bump and the wafer.

Copper Clip: Copper clip interconnect technology uses a solid copper bridge or “clip” to connect the die to the package carrier. The clip allows a higher level of current flow than a wire and also provides a better method of heat transfer from the die. The clip is either spot welded, or more often re-flow soldered, to the die pads and the package carrier pads.

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Package Carriers

Leadframe:  A leadframe is a miniature sheet of metal, generally made of copper and silver alloys, on which a pattern of electrical connections (or “leads”) has been cut. The leads are generally placed around the perimeter of the leadframe and are used to connect the package to the system board. The number of leads on an individual leadframe is limited as electrical shorting can occur if the leads are placed too close together.

Substrate:   A substrate is a laminate of multiple layers of epoxy resin, woven glass fibers and metal conductors. Bumps provide the electrical connection to the system board. The bumps are typically distributed evenly across the bottom surface of the substrate (called a “ball grid array” format). This allows greater distance between individual leads and a higher number of interconnects than leadframe packages.

Test Services

Amkor provides a complete range of semiconductor testing services including wafer testing or probe and final test. We offer a full range of test software, hardware, integration and product engineering services, and we support a range of business models and test capabilities. Substantially all of our test business is derived from testing packages that we assemble.

Wafer Test Services: Wafer test, also referred to as wafer probe, is performed after wafer fabrication or wafer bumping to screen out defective devices prior to packaging. We offer a range of wafer test coverage that can be tailored based on the cost and complexity of the die, the package and the product. These services range from coarse level screening for major defects all the way up to probing at high digital speeds and can include full radio frequency transmit and receive as well as testing at multiple temperatures. Wafer testing can also involve a range of wafer mapping and inspection operations.

Final Test Services: After the packaging process, final test is performed to ensure that the packaged device meets the customer’s requirements. Final test spans a range of rigor and complexity depending on the device and end market application. More rigorous types of final test include testing multiple times under different electrical and temperature conditions and before and after device reliability stresses, such as burn-in. In addition to electrical testing, specialized solutions are required for packages that also process non-electric stimuli.

The electrical tests are a mix of functional, structural and system-level tests depending on the customer’s requirements and cost and reliability parameters. The electrical test equipment we use includes commercially available automated test equipment, customized and proprietary system level test equipment and innovative types of low cost test equipment developed by Amkor.

Advanced Products and Mainstream Products

We offer a broad range of advanced and mainstream packaging and test services to our customers. We refer to our flip chip, wafer-level processing and related test services as “Advanced Products”, and our wirebond packaging and related test services as “Mainstream Products”. The following table sets forth, for the periods indicated, the amount of advanced and mainstream packaging and test net sales and the percentage of such net sales:

	Year Ended December 31,
	2014				2013				2012
	(In millions, except percentage of net sales)
Advanced products	$	1,553	49.6	%	$	1,451	49.1	%	$	1,302	47.2	%
Mainstream products	1,576		50.4	%	1,505		50.9	%	1,458		52.8	%
Total net sales	$	3,129	100.0	%	$	2,956	100.0	%	$	2,760	100.0	%

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Advanced Products

Our advanced packages include flip chip chip scale packages, wafer-level chip scale packages and flip chip ball grid array packages. These package families use flip chip interconnect technology so that the die can be connected to a substrate package carrier or, in the case of wafer-level chip scale packages, directly to a printed circuit board.

Flip Chip Chip Scale Package ("FC CSP") Products: FC CSP packages are small form factor packages where the substrate size is not much larger than the die itself. The size advantage provided by chip scale packaging technologies has made FC CSP an attractive choice for a wide variety of applications that require very small form factors such as smartphones, tablets and other mobile consumer electronic devices.

Flip chip stacked chip scale packages ("FC SCSP") stack a second die on top of the original die. The top die is typically a memory device, and wirebond interconnects are used to attach it to the substrate. FC SCSP is frequently used to stack memory on top of digital baseband and applications processors for use in mobile devices.

We developed fine pitch copper pillar flip chip interconnect technology, which creates interconnections at finer pitches using a plating process to reduce the number of substrate layers to facilitate very thin packages. This innovative solution is also an enabling technology for 2.5D and 3D package stacking with TSVs.

Wafer-level chip scale packages ("WL CSP") do not utilize a package carrier. The bumped wafer is singulated into individual die, and the wafer-level package is then attached directly to the system board. WL CSP offers one of the lowest total system costs, enabling higher semiconductor content while leveraging the smallest form factor and one of the highest performing, most reliable, semiconductor package platforms on the market today. We have seen significant growth in our WL CSP business, particularly for power management, radio frequency, and integrated connectivity applications.

Flip Chip Ball Grid Array ("FC BGA") Products: FC BGA packages are large form factor substrate-based packages which are used where processing power and speed are needed, and small form factors are not required. Our FC BGA packages are assembled around state-of-the-art substrates. Utilizing multiple high density routing layers, laser drilled vias, and ultra-fine line and space metallization, FC BGA substrates have the highest routing density available. The variety of FC BGA package options allows package selection to be tailored to the specific thermal needs of the end product. We offer FC BGA packaging in a variety of product formats to fit a wide range of end application requirements, including networking, storage, computing and consumer applications.

Our Flip Chip Molded BGA ("FCmBGA") packages utilize a molding compound that replaces traditional capillary underfill to interconnect larger die onto a substrate without the structural need for a lid or stiffening ring. This enables thinner packaging and improved thermal performance while reducing system cost.

System-in-Package ("SiP") Modules: SiP modules contain any combination of one or more die of different functionalities, passive components and MEMs integrated into a single package to create a fully functioning system or subsystem. These modules use wirebond or flip chip interconnect technologies to connect the die to a substrate package carrier. The passive components can include inductors, capacitors, resistors, filters and diplexers. SiP modules are used in mobile devices and other applications for components such as fingerprint sensors, radio frequency controllers, power amplifiers, GPS modules, Bluetooth modules, digital basebands and hard drive controllers.

Mainstream Packages

Our mainstream packages include leadframe packages, substrate-based wirebond packages and micro-electro-mechanical systems packages. These package families use wirebond interconnect technology to connect a die to a leadframe or substrate package carrier.

Leadframe Packages: Leadframe packages use wirebond or flip chip technology to interconnect a die to a leadframe package carrier. Leadframe packages are used in many electronic devices and remain the most practical and cost-effective solution for many low to medium pin count applications.

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Traditional leadframe packages support a wide variety of device types and applications. Two of our most popular traditional leadframe package types are small outline integrated circuit and quad flat package, commonly known as “dual” and “quad” products, respectively, based upon the number of sides from which the leads extend. The traditional leadframe package family has evolved from “through hole design,” where the leads are plugged into holes on the circuit board to “surface mount design,” where the leads are soldered to the surface of the circuit board. We offer a wide range of lead counts and body sizes to satisfy variations in the size of customers’ semiconductor devices.

Through a process of continuous engineering and customization, we have designed several leadframe package types that are thinner and smaller than traditional leadframe packages, and which have the ability to accommodate more leads on the perimeter of the package. These leadframe packages typically have superior thermal and electrical characteristics, which allow them to dissipate heat generated by high-powered semiconductor devices while providing enhanced electrical connectivity. We are developing increasingly smaller versions of these packages to keep pace with continually shrinking semiconductor device sizes and demand for miniaturization of portable electronic products. One of our more successful leadframe package offerings is the MicroLeadFrame family of quad flat no lead packages.

Power discrete devices use a leadframe as the package carrier and primarily use wirebond interconnect technology. However, power applications that require improved thermal and electrical performance will use packaging with copper clip interconnect technology.

Substrate-based Wirebond Packages: Substrate-based wirebond packages use wirebond technology to connect a die to a substrate. Some of our packages in this category include stacked CSP, chip array ball grid array ("BGA") packages and plastic ball grid array ("PBGA") packages.

Stacked CSP technology enables the stacking of a wide range of different semiconductor devices to deliver high levels of silicon integration and area efficiency. Stacked CSP utilizes high density thin core substrates and advanced materials, along with leading-edge wafer thinning, die attach, and molding capabilities to stack multiple die on a substrate. Stacked CSP is ideal for memory, including NAND, NOR and DRAM memory, and mixed signal applications.

Chip array BGA packages offer a broad selection of ball array pitches, ball counts and body sizes, single and multi-die layouts, stacked die and passive component integration. They are applicable for a wide range of semiconductors requiring a smaller package size than conventional PBGAs or leadframe packages.

Plastic ball grid array packages are used in applications requiring higher pin count than leadframe packages, but typically have lower pin counts than flip chip. PBGA packages are designed for low inductance, improved thermal operation and enhanced surface-mount technology ability. Custom performance enhancements, like ground and power planes, are also available.

Micro-Electro-Mechanical Systems ("MEMS") Packages: MEMS are miniaturized mechanical and electro-mechanical sensors that can sense or manipulate the physical world. Examples of MEMS devices include microphones, accelerometers, gyrometers, magnetometers, humidity and temperature sensors and pressure sensors. MEMS are most typically created on silicon wafers but can also employ other substrate types as well. MEMS devices often require an extra fabrication process where the device wafer is bonded to a second wafer which effectively encapsulates the MEMS structure. This method leaves the device free to move within a vacuum or an inert gas atmosphere. However, applications such as microphones and pressure sensors require the MEMS structure to remain unencapsulated, requiring innovative cavity style packages.

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End Markets

The following table lists the end markets that use our products:

End Market	Applications	Package Type
Communications	Handsets (Cell Phones, Feature Phones, Smart Phones) Tablets Handheld Devices Wireless LAN	Flip Chip Chip Scale Package Stacked Chip Scale Package Wafer Level Chip Scale Package Fine Pitch Flip Chip Chip Scale Package ChipArray Ball Grid Array Flip Chip Stacked Chip Scale Package
Consumer	Television Set Top Boxes Visual/Imaging Products Portable Media Gaming	Flip Chip Ball Grid Array Thin Quad Flat Pack ChipArray Ball Grid Array Digital Micromirror Device Plastic Ball Grid Array MicroLeadFrame
Automotive and Industrial	Infotainment Safety Performance, Fuel Efficiency and Environmental Sustainability Comfort, Aesthetics and Security	MicroLeadFrame Small Outline Integrated Circuit Plastic Ball Grid Array Thin Quad Flat Pack Thin Shrink Small Outline Package
Networking	Servers Routers Switches	Flip Chip Ball Grid Array Plastic Ball Grid Array MicroLeadFrame Thin Quad Flat Pack ChipArray Ball Grid Array Thin Quad Flat Pack
Computing	Desk Top Computer Laptop Computer Notebook Computer Hard Disk Drive Printers and Other Peripherals Computer Server	Flip Chip Ball Grid Array MicroLeadFrame ChipArray Ball Grid Array Flip Chip Chip Scale Package Stacked Chip Scale Package Thin Quad Flat Pack

RELATIONSHIP WITH J-DEVICES CORPORATION

J-Devices Corporation is the largest provider of outsourced semiconductor packaging and test services in Japan with net sales of $0.9 billion in 2014. J-Devices' business covers a broad range of packaging and test services focused on the automotive, industrial and consumer end markets. The company's customers include some of the largest semiconductor companies in the world, such as Fujitsu Semiconductor Limited, Renesas Electronics Corporation and Toshiba Corporation.

J-Devices was formed in 2009 as a result of a joint venture between Amkor, Toshiba and J-Devices' predecessor, Nakaya Microdevices Corporation ("NMD"). As part of this transaction, J-Devices acquired certain assets and business, including technology development, of Toshiba's semiconductor packaging business. Since that time, J-Devices has experienced considerable growth through various acquisitions, including the purchase of three packaging and test facilities from Fujitsu in 2012, the purchase of three additional packaging and test facilities from Renesas in 2013 and the purchase of our previously wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan in 2014.

We increased our ownership in J-Devices from 30% to 60% in 2013 and from 60% to 65.7% in 2015. J-Devices is now owned 65.7% by Amkor and 34.3% by the former shareholders of NMD. The governance provisions applicable to J-Devices restrict our ability to cause J-Devices to take certain actions without the consent of the other investors. Accordingly, we account for our investment in J-Devices using the equity method of accounting. We plan to exercise the remaining option to increase our ownership interest to 80% by 2016, at which time certain governance restrictions will lapse and we will

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begin consolidating J-Devices' results. We continue to work closely with J-Devices in a number of areas, including joint purchasing programs and joint technology development.

RESEARCH AND DEVELOPMENT

Our research efforts focus on developing new packaging solutions and test services, and improving the efficiency and capabilities of our existing production processes. We believe that technology development is one of the keys to success in the semiconductor packaging and test industry. By concentrating our research and development on our customers’ needs for innovative packages, increased performance and lower cost, we gain opportunities to enter markets early, capture market share and promote our new package offerings as industry standards.

One of our top priorities is developing low-cost packaging solutions for the next generation of mobile devices, which minimize material and processing costs, while maximizing yields and reliability. This development effort is particularly important for customers seeking cost-effective alternatives to further silicon-level integration. Another important focus area is the development of wafer-level packages for larger chips. These wafer-level chip-scale packages are increasingly the preferred package type for many chips used in mobile devices. They provide a very low-profile product at a competitive cost.

As of December 31, 2014, we had approximately 400 employees engaged in research and development activities. In 2014, 2013 and 2012, we incurred $76.9 million, $64.6 million and $54.1 million, respectively, of research and development expense.

MARKETING AND SALES

Our marketing and sales offices are located throughout Asia, Europe and North America. Our support personnel manage and promote our packaging and test services and provide key customer and technical support. To provide comprehensive sales and customer service, we typically assign our customers a direct support team consisting of an account manager, technical program manager, test program manager and both field and factory customer support representatives. We also support our largest multinational customers from multiple office locations to ensure that we are aligned with their global operational and business requirements.

Our direct support teams are further supported by an extended staff of product, process, quality and reliability engineers, as well as marketing and advertising specialists, information systems technicians and factory personnel. Together, these direct and extended support teams deliver an array of services to our customers. These services include:

• Managing and coordinating ongoing manufacturing activity;

• Providing information and expert advice on our portfolio of packaging and test services and related trends;

• Managing the start-up of specific packaging and test programs;

• Working to improve our customers’ time-to-market;

• Providing a continuous flow of information to our customers regarding products and programs in process;

• Partnering with customers on design solutions;

• Researching and assisting in the resolution of technical and logistical issues;

• Aligning our technologies and research and development activities with the needs of our customers and OEMs;

• Providing guidance and solutions to customers in managing their supply chains;

• Driving industry standards;

• Providing design and simulation services to ensure package reliability and

• Collaborating with our customers on continuous quality improvement initiatives.

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Further, we implement direct electronic links with our customers to:

• Achieve near real time and automated communications of order fulfillment information, such as inventory control, production schedules and engineering data, including production yields, device specifications and quality indices and

• Connect our customers to our sales and marketing personnel world-wide and to our factories.

SEASONALITY

Our sales have generally been higher in the second half of the year than in the first half due to the effect of consumer buying patterns in the U.S., Europe and Asia and the timing of flagship mobile device launches. In addition, semiconductor companies generally reduce their production during the holidays at the end of December which results in a decrease in packaging and test services during the first quarter.

CUSTOMERS

As of December 31, 2014, we had approximately 250 customers, including many of the largest semiconductor companies in the world. Our ten largest customers accounted for 60.9% of our net sales in 2014. Qualcomm Incorporated and Toshiba each accounted for more than 10% of our net sales in 2014.

MATERIALS AND EQUIPMENT

Materials

Our materials are used primarily for packaging activities. Our packaging operations depend upon obtaining adequate supplies of materials on a timely basis. The principal materials used in our packaging process are leadframes, laminate substrates, gold and copper wire, mold compound, epoxy, tubes and trays. The silicon wafer is generally consigned from the customer. We do not take ownership of the customer consigned wafer, and title and risk of loss remains with the customer for these materials. Test materials constitute a very small portion of our total test cost. We purchase materials based on customer forecasts, and our customers are generally responsible for any unused materials which we purchased based on such forecasts.

We obtain the materials required for packaging services from various suppliers. We source most of our materials, including critical materials such as leadframes, laminate substrates and gold wire, from a limited group of suppliers. We work closely with our primary material suppliers to ensure that materials are available and delivered on time and, we also negotiate world-wide pricing agreements with our major suppliers to take advantage of the scale of our operations.

Equipment

Our ability to meet the changing demand from our customers for manufacturing capacity depends upon obtaining packaging and test equipment in a timely manner. We work closely with our main equipment suppliers to coordinate the ordering and delivery of equipment to meet our expected capacity needs.

The primary types of equipment used in providing our packaging services are wirebonders and die bonders. In addition, we maintain a variety of other packaging equipment, including mold, singulation, die attach, ball attach and wafer backgrind, along with numerous other types of manufacturing equipment. A substantial portion of our packaging equipment base can generally be used and adapted to support the manufacture of many of our packages through the use of relatively low cost tooling, although equipment used in advanced packaging can be more difficult to redeploy than equipment used in traditional wirebond packaging.

We also purchase wafer bumping equipment to facilitate our flip chip and wafer level packaging services. Wafer bump equipment includes sputter and spin coaters, electroplating equipment, reflow ovens and other types of equipment. This equipment tends to have longer lead times for delivery and installation than other packaging equipment and is sold in relatively larger increments of capacity.

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The primary equipment used in the testing process includes testers, handlers and probers. Handlers are used to transfer individual or small groups of packaged integrated circuits to a tester. Test equipment is generally a more capital intensive portion of the process and tends to have longer delivery lead times than most types of packaging equipment. We focus our capital expenditures on standardized tester platforms in order to maximize test equipment utilization where possible.

ENVIRONMENTAL MATTERS

The semiconductor packaging process uses chemicals, materials and gases and generates byproducts that are subject to extensive governmental regulations. For example, we produce liquid waste when semiconductor wafers are diced into chips with the aid of diamond saws, then cooled with running water. In addition, semiconductor packages have historically utilized metallic alloys containing lead (Pb) within the interconnect terminals typically referred to as leads, pins or balls. The usage of lead (Pb) has decreased over the past few years, as we have ramped volume production of alternative lead (Pb)-free processes. Our operations are subject to numerous laws and regulations governing the protection of the environment, disposal of waste, discharges into water, emissions into the atmosphere and the protection of employee health and safety. Future regulations may impose stricter environmental requirements on the semiconductor packaging and test industry and may require additional capital investment.

We are engaged in a continuing program to assure compliance with federal, state and local environmental laws and regulations. We do not expect that capital expenditures or other costs attributable to compliance with environmental laws and regulations will have a material adverse effect on our business, liquidity, results of operations, financial condition or cash flows.

COMPETITION

The outsourced semiconductor packaging and test market is very competitive. We face substantial competition from established packaging and test service providers primarily located in Asia, including companies with significant manufacturing capacity, financial resources, research and development operations, marketing and other capabilities. These companies include Advanced Semiconductor Engineering, Inc., Siliconware Precision Industries Co., Ltd. and STATS ChipPAC Ltd.

Such companies also have developed relationships with most of the world’s largest semiconductor companies, including current or potential customers of Amkor. We also compete with the internal semiconductor packaging and test capabilities of many of our customers. Our IDM customers continually evaluate the attractiveness of outsourced services against their own in-house packaging and test services and at times may decide to shift some or all of their outsourced packaging and test services to internally sourced capacity. We also compete with contract foundries that provide wafer bumping and other advanced packaging solutions that compete with our packaging and test services. In addition, we compete with companies that offer only test services and not packaging.

The principal elements of competition in the semiconductor packaging and test services market include:

• technical competence;

• quality;

• price;

• breadth of packaging and test services offered, including turnkey services;

• new package and test design, technology innovation and implementation;

• cycle times;

• customer service and

• available capacity and ability to invest in capacity, geographic location and scale of manufacturing.

We believe that we generally compete favorably with respect to each of these elements.

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INTELLECTUAL PROPERTY

We maintain an active program to protect and derive value from our investment in technology and the associated intellectual property rights. Intellectual property rights that apply to our various products and services include patents, copyrights, trade secrets and trademarks. We have filed and obtained a number of patents in the U.S. and abroad, and their durations vary depending on the jurisdiction in which each patent is filed. Although our patents are an important element of our intellectual property strategy as a whole, we are not materially dependent on any one patent or any one technology. We expect to continue to file patent applications when appropriate to protect our proprietary technologies, but we cannot assure you that we will receive patents from pending or future applications. In addition, any patents we obtain may be challenged, invalidated or circumvented and may not provide meaningful protection or other commercial advantage to us.

We also protect certain details about our processes, products and strategies as trade secrets by maintaining the confidentiality of the information we believe provides us with a competitive advantage. We have ongoing programs designed to maintain the confidentiality of such information. Further, to distinguish our products from our competitors’ products, we have obtained certain trademarks and service marks and may promote our particular brands through advertising and other marketing techniques.

EMPLOYEES

As of December 31, 2014, we had approximately 21,900 full-time employees. Of the total employee population, approximately 19,700 were engaged in manufacturing services. We believe that our relations with our employees are good, and we have not experienced a work stoppage in any of our factories. Our employees in Europe, Japan, the Philippines, Taiwan and the U.S. are not represented by any union. Certain employees at our factories in China, Korea and Malaysia are members of a union and we operate subject to collective bargaining agreements that we have entered into with these unions.

Item 1A. Risk Factors

The factors discussed below are cautionary statements that identify important factors and risks that could cause actual results to differ materially from those anticipated by the forward-looking statements contained in this report. For more information regarding the forward-looking statements contained in this report, see the Table of Contents of this Annual Report on Form 10-K. You should carefully consider the risks and uncertainties described below, together with all of the other information included in this report, in considering our business and prospects. The risks and uncertainties described below are not the only ones facing Amkor. Additional risks and uncertainties not presently known to us may also impair our business operations. The occurrence of any of the following risks could affect our business, liquidity, results of operations, financial condition or cash flows.

Dependence on the Highly Cyclical Semiconductor Industry - We Operate in Volatile Industries, and Industry Downturns and Declines in Global Economic and Financial Conditions Could Harm Our Performance.

Our business is impacted by market conditions in the semiconductor industry, which is cyclical by nature and impacted by broad economic factors, such as world-wide gross domestic product and consumer spending. The semiconductor industry has experienced significant and sometimes sudden and prolonged downturns in the past. For example, the financial crisis and global recession in 2008 and 2009 resulted in a downturn in the semiconductor industry that adversely affected our business and results of operations during those periods. The economic recovery since that time has been slow and uneven.

Since our business is, and will continue to be, dependent on the requirements of semiconductor companies for outsourced packaging and test services, any downturn in the semiconductor industry or any other industry that uses a significant number of semiconductor devices, such as telecommunications, consumer electronics, or computing, could have a material adverse effect on our business and operating results. During downturns we have experienced, among other things, reduced demand, excess capacity and reduced sales. It is difficult to predict the timing, strength or duration of any economic slowdown or subsequent economic recovery, which, in turn, makes it more challenging for us to forecast our operating results, make business decisions and identify risks that may affect our business, sources and uses of cash, financial condition and results of operations. Additionally, if industry conditions deteriorate, we could suffer significant losses, as we have in the past, which could materially impact our business, liquidity, results of operations, financial condition and cash flows.

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Also, the action or inaction of the U.S. government relating to federal income tax increases for individuals or corporations, the federal debt ceiling, the federal deficit and government spending restrictions or shutdowns, may adversely affect consumer demand and economic growth in the U.S. and globally, which may harm the semiconductor industry and our business.

Fluctuations in Operating Results and Cash Flows - Our Operating Results and Cash Flows Have Varied and May Vary Significantly as a Result of Factors That We Cannot Control.

Many factors, including the impact of adverse economic conditions, could have a material adverse effect on our net sales, gross profit, operating results and cash flows, or lead to significant variability of quarterly or annual operating results. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

Our net sales, gross profit, operating income and cash flows have historically fluctuated significantly from quarter to quarter as a result of many of the following factors, over which we have little or no control and which we expect to continue to impact our business:

• fluctuation in demand for semiconductors and conditions in the semiconductor industry generally, as well as by specific customers, such as inventory reductions by our customers impacting demand in key markets;

• changes in our capacity and capacity utilization rates;

• changes in average selling prices which can occur quickly due to the absence of long term agreements on price;

• changes in the mix of the semiconductor packaging and test services that we sell;

• the development, transition and ramp to high volume manufacture of more advanced silicon nodes and evolving wafer, packaging and test technologies, may cause production delays, lower manufacturing yields and supply constraints for new wafers and other materials;

• absence of backlog, the short-term nature of our customers’ commitments, double bookings by customers and deterioration in customer forecasts and the impact of these factors, including the possible delay, rescheduling and cancellation of large orders, or the timing and volume of orders relative to our production capacity;

• changes in costs, quality, availability and delivery times of raw materials, components and equipment;

• changes in labor costs to perform our services;

• wage inflation and fluctuations in commodity prices, including gold, copper and other precious metals;

• the timing of expenditures in anticipation of future orders;

• changes in effective tax rates;

• the availability and cost of financing;

• intellectual property transactions and disputes;

• high leverage and restrictive covenants;

• warranty and product liability claims and the impact of quality excursions and customer disputes and returns;

• costs associated with legal claims, indemnification obligations, judgments and settlements;

• international events, political instability, civil disturbances or environmental or natural events, such as earthquakes, that impact our operations;

• pandemic illnesses that may impact our labor force and our ability to travel;

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• costs of acquisitions and divestitures, difficulties integrating acquisitions, the failure of our joint ventures to operate in accordance with business plans and fluctuations in the results of investments accounted for using the equity method;

• our ability to attract and retain qualified personnel to support our global operations;

• fluctuations in foreign exchange rates;

• fluctuations in our manufacturing yields;

• our ability to penetrate various market segments, such as power discrete and the mid-tier and entry-level segments of the mobile device market;

• dependence on key customers or concentration of customers in certain market segments, such as mobile communications and

• restructuring charges, asset write-offs and impairments.

It is often difficult to predict the impact of these factors upon our results for a particular period. The downturn in the global economy and the semiconductor industry in 2009 increased the risks associated with the foregoing factors as customer forecasts became more volatile, and there was less visibility regarding future demand and significantly increased uncertainty regarding the economy, credit markets and consumer demand. The slow rate of economic growth in the U.S. and elsewhere and economic uncertainty worldwide could continue to cause volatility in customer forecasts and reduce our visibility regarding future demand in the semiconductor industry. These factors may have a material and adverse effect on our business, liquidity, results of operations, financial condition and cash flows or lead to significant variability of quarterly or annual operating results. In addition, these factors may adversely affect our credit ratings which could make it more difficult and expensive for us to raise capital and could adversely affect the price of our securities.

Absence of Backlog - The Lack of Contractually Committed Customer Demand May Adversely Affect Our Sales.

Our packaging and test business does not typically operate with any material backlog. Our quarterly net sales from packaging and test services are substantially dependent upon our customers’ demand in that quarter. None of our customers have committed to purchase any significant amount of packaging or test services or to provide us with binding forecasts of demand for packaging and test services for any future period, in any material amount. In addition, we sometimes experience double booking by customers and our customers often reduce, cancel or delay their purchases of packaging and test services for a variety of reasons including industry-wide, customer-specific and Amkor-specific reasons. This makes it difficult for us to forecast our capacity utilization and net sales in future periods. Since a large portion of our costs is fixed and our expense levels are based in part on our expectations of future sales, we may not be able to adjust costs in a timely manner to compensate for any sales shortfall. If we are unable to adjust costs in a timely manner, our margins, operating results, financial condition and cash flows would be adversely affected.

High Fixed Costs - Due to Our High Percentage of Fixed Costs, We Will Be Unable to Maintain Our Gross Margin at Past Levels if We Are Unable to Achieve Relatively High Capacity Utilization Rates.

Our operations are characterized by relatively high fixed costs. Our profitability depends in part not only on pricing levels for our packaging and test services, but also on the efficient utilization of our human resources and packaging and test equipment. Increases or decreases in our capacity utilization can significantly affect gross margins. In periods of low demand, we experience relatively low capacity utilization in our operations, which leads to reduced margins during that period. Transitions between different packaging technologies, such as the transition from gold wirebond to flip chip and copper wirebond packages, can also impact our capacity utilization if we do not efficiently redeploy our equipment for other packaging and test opportunities. For example, in 2011 the migration of some customer demand from wirebond to flip chip packages resulted in under-utilized wirebond assets which negatively impacted our capacity utilization and gross margin. We cannot assure you that we will be able to achieve consistently high capacity utilization, and if we fail to do so, our gross margins may decrease. If our gross margins decrease, our business, liquidity, results of operations, financial condition and cash flows could be materially adversely affected.

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In addition, our fixed operating costs have increased in recent years in part as a result of our efforts to expand our capacity through significant capital expenditures. Forecasted customer demand for which we have made capital investments may not materialize, especially if industry conditions deteriorate. As a result, our sales may not adequately cover fixed costs resulting in reduced profit levels or causing significant losses, both of which may adversely impact our business, liquidity, results of operations, financial condition and cash flows.

Guidance - Our Failure to Meet Our Guidance or Analyst Projections Could Adversely Impact the Trading Prices of Our Securities.

We periodically provide guidance to investors with respect to certain financial information for future periods. Securities analysts also periodically publish their own projections with respect to our future operating results. As discussed above under “Fluctuations in Operating Results and Cash Flows - Our Operating Results and Cash Flows Have Varied and May Vary Significantly as a Result of Factors That We Cannot Control,” our operating results and cash flows vary significantly and are difficult to accurately predict. Volatility in customer forecasts and fluctuations in global consumer demand make it particularly difficult to predict future results. To the extent we fail to meet or exceed our own guidance or the analyst projections for any reason, the trading prices of our securities may be adversely impacted. Moreover, even if we do meet or exceed that guidance or those projections, if analysts and investors do not react favorably, or if analysts were to discontinue providing coverage of our company, the trading prices of our securities may be adversely impacted.

Declining Average Selling Prices - Historically There Has Been Downward Pressure on the Prices of Our Packaging and Test Services.

Prices for packaging and test services have generally declined over time, and sometimes prices can change significantly in relatively short periods of time. We expect downward pressure on average selling prices for our packaging and test services to continue in the future. If we are unable to offset a decline in average selling prices by developing and marketing new packages with higher prices, reducing our purchasing costs, recovering more of our material cost increases from our customers and reducing our manufacturing costs, our business, liquidity, results of operations, financial condition and cash flows could be materially adversely affected.

Decisions by Our Integrated Device Manufacturer Customers to Curtail Outsourcing May Adversely Affect Our Business.

Historically, we have been dependent on the trend in outsourcing of packaging and test services by IDM customers. Our IDM customers continually evaluate the need for outsourced services against their own in-house packaging and test services. As a result, at any time and for a variety of reasons, IDMs may decide to shift some or all of their outsourced packaging and test services to internally sourced capacity.

The reasons IDMs may shift their outsourced business to internal capacity include:

• their desire to realize higher utilization of their existing packaging and test capacity, especially during downturns in the semiconductor industry;

• their unwillingness to disclose proprietary technology;

• their possession of more advanced packaging and test technologies and

• the guaranteed availability of their own packaging and test capacity.

In addition, to the extent we limit capacity commitments for certain customers, these customers may increase their level of in-house packaging and test capabilities, which could make it more difficult for us to regain their business when we have available capacity.

In a downturn in the semiconductor industry, IDMs could respond by shifting some or all outsourced packaging and test services to internally serviced capacity on a short term basis. Also, the IDMs could curtail or reverse the trend of outsourcing packaging and test services. If we experience a significant loss of IDM business, it could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows, especially during a prolonged industry downturn.

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Our Substantial Indebtedness Could Adversely Affect Our Financial Condition and Prevent Us from Fulfilling Our Obligations.

We have a significant amount of indebtedness, and the terms of the agreements governing our indebtedness allow us and our subsidiaries to incur more debt, subject to certain limitations. As of December 31, 2014, our total debt balance was $1,530.8 million, of which $5.0 million was classified as a current liability and $255.0 million was collateralized indebtedness at our subsidiaries. We may consider investments in joint ventures, increased capital expenditures or acquisitions which may increase our indebtedness. If new debt is added to our consolidated debt level, the related risks that we face could intensify.

Our substantial indebtedness could:

• make it more difficult for us to satisfy our obligations with respect to our indebtedness, including our obligations under our indentures to purchase notes tendered as a result of a change in control of Amkor;

• increase our vulnerability to general adverse economic and industry conditions;

• limit our ability to fund future working capital, capital expenditures, research and development and other business opportunities, including joint ventures and acquisitions;

• require us to dedicate a substantial portion of our cash flow from operations to service payments of interest and principal on our debt thereby reducing the availability of our cash flow to fund future working capital, capital expenditures, research and development expenditures and other general corporate requirements;

• increase the volatility of the price of our common stock;

• limit our flexibility to react to changes in our business and the industry in which we operate;

• place us at a competitive disadvantage to any of our competitors that have less debt;

• limit, along with the financial and other restrictive covenants in our indebtedness, among other things, our ability to borrow additional funds;

• limit our ability to refinance our existing indebtedness, particularly during periods of adverse credit market conditions when refinancing indebtedness may not be available under interest rates and other terms acceptable to us or at all and

• increase our cost of borrowing.

We May Have Difficulty Funding Liquidity Needs.

We assess our liquidity based on our current expectations regarding sales, operating expenses, capital spending and debt service requirements. Our liquidity is affected by, among other things, the performance of our business, our capital expenditure and other investment levels and our ability to repay debt and other long-term obligations out of our operating cash flows or with the proceeds of debt or equity financings.

We operate in a capital intensive industry. We had capital expenditures of $681.1 million in 2014. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures and other investments, which are generally made in advance of the related revenues and without firm customer commitments. Ultimately the actual amount of our capital expenditures for 2015 and thereafter may vary materially and will depend on several factors. These factors include, among others, the amount, timing and implementation of our capital projects, including those under review and those not yet planned, the performance of our business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity and facilities and the availability of cash flows from operations or financing.

In addition, we have a significant level of debt, which requires significant scheduled principal and interest payments in the coming years. The sources funding our operations, including making capital expenditures and other investments and

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servicing principal and interest obligations with respect to our debt, are cash flows from our operations, existing cash and cash equivalents, borrowings under available debt facilities, or proceeds from any additional debt or equity financing.

The health of the worldwide banking system and capital markets affects our liquidity. If financial institutions that have extended credit commitments to us are adversely affected by the conditions of the U.S. and international banking system and capital markets, they may refuse or be unable to fund borrowings under their credit commitments to us. Volatility in the banking system and capital markets could also make it difficult or more expensive for us to maintain our existing credit facilities or refinance our debt.

The trading price of our common stock has been, and is likely to continue to be, highly volatile and could be subject to wide fluctuations. Such fluctuations could impact our decision or ability to utilize the equity markets as a potential source of our funding needs in the future.

In addition, there is a risk that we could fail to generate the necessary net income or operating cash flows to meet the funding needs of our business due to a variety of factors, including the other factors discussed in this "Risk Factors" section. If we fail to generate the necessary cash flows or we are unable to access the capital markets when needed, our liquidity may be adversely impacted.

Restrictive Covenants in the Indentures and Agreements Governing Our Current and Future Indebtedness and Our Joint Venture Agreements Could Restrict Our Operating Flexibility.

The indentures and agreements governing our existing debt, and debt we may incur in the future, contain, or may contain, affirmative and negative covenants that materially limit our ability to take certain actions, including our ability to incur debt, pay dividends and repurchase stock, make certain investments and other payments, enter into certain mergers and consolidations, engage in sale leaseback transactions and encumber and dispose of assets. In addition, our future debt agreements may contain financial covenants and ratios.

The breach of any of these covenants by us or the failure by us to meet any of the financial ratios or conditions could result in a default under any or all of such indebtedness. If a default occurs under any such indebtedness, all of the outstanding obligations thereunder could become immediately due and payable, which could result in a default under our other outstanding debt and could lead to an acceleration of obligations related to other outstanding debt. The existence of such a default or event of default could also preclude us from borrowing funds under our revolving credit facilities. Our ability to comply with the provisions of the indentures, credit facilities and other agreements governing our outstanding debt and indebtedness we may incur in the future can be affected by events beyond our control and a default under any debt instrument, if not cured or waived, could have a material adverse effect on us.

Also, our ability to sell our joint venture investments or for our joint ventures to pay dividends, make distributions, provide loans or make other payments to us may be restricted by our joint venture agreements. As a result, we may not be able to access the cash flow of our joint ventures or realize a cash return on our joint venture investment. For example, the governance provisions of our joint venture with J-Devices require the consent of the joint venture partners to pay dividends or for us to sell our investment.

We Have Significant Severance Plan Obligations Associated With Our Manufacturing Operations in Korea Which Could Reduce Our Cash Flow and Negatively Impact Our Financial Condition.

We sponsor an accrued severance plan for our Korean subsidiary, under which we have an accrued liability of $146.7 million as of December 31, 2014. Existing tax laws in Korea limit our ability to deduct severance expenses associated with the current plan. These limitations are designed to encourage companies to migrate to a defined contribution or defined benefit plan. If we adopt a new plan, we may fund a significant portion of the existing liability, which could have a material adverse effect on our liquidity, financial condition and cash flows. If we do not adopt a new plan, our ability to deduct accrued severance will continue to be limited, and as a result we will have to pay higher taxes, which could adversely affect our liquidity, financial condition and cash flows.

Under the existing Korean plan, to the extent eligible employees are terminated, our Korean subsidiary would be required to make lump-sum severance payments on behalf of these eligible employees based on their length of service, seniority and

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rate of pay at the time of termination. Since our severance plan obligation is significant, in the event of a significant layoff or other reduction in our labor force in Korea, payments under the plan could have a material adverse effect on our liquidity, financial condition and cash flows. See Note 15 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

If We Fail to Maintain an Effective System of Internal Controls, We May Not be Able to Accurately Report Financial Results or Prevent Fraud.

Effective internal controls are necessary to provide reliable financial reports and to assist in the effective prevention of fraud. We must annually evaluate our internal procedures to satisfy the requirements of Section 404 of the Sarbanes-Oxley Act of 2002, which requires management and our independent registered public accounting firm to assess the effectiveness of internal control over financial reporting.

Internal controls may not prevent or detect misstatements because of their inherent limitations, including the possibility of human error, the circumvention or overriding of controls, fraud or corruption. Therefore, even effective internal controls can provide only reasonable assurance with respect to the preparation and fair presentation of financial statements. In addition, projections of any evaluation of effectiveness of internal controls to future periods are subject to the risk that the internal controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As previously reported, we are implementing a new ERP system in a multi-year program on a world-wide basis. We have implemented several significant ERP modules and expect to implement additional ERP modules in the future. In addition, we implemented a new shop floor management system in certain of our factories and integrated the acquired operations of Amkor Technology Malaysia Sdn. Bhd. into our overall internal control over financial reporting. The implementation of these systems, as well as the integration of the acquired operations represents changes in our internal control over financial reporting. Although we continue to monitor and assess our internal controls for these systems and operations, there is a risk that deficiencies may occur that could constitute significant deficiencies or, in the aggregate, a material weakness.

If we fail to remedy any deficiencies or maintain the adequacy of our internal controls, we could be subject to regulatory scrutiny, civil or criminal penalties or shareholder litigation. In addition, failure to maintain adequate internal controls could result in financial statements that do not accurately reflect our operating results or financial condition.

We Face Warranty Claims, Product Return and Liability Risks, the Risk of Economic Damage Claims and the Risk of Negative Publicity if Our Packages Fail.

Our packages are incorporated into a number of end products, and our business is exposed to warranty claims, product return and liability risks, the risk of economic damage claims and the risk of negative publicity if our packages fail.

We receive warranty claims from our customers which occur from time to time in the ordinary course of our business. If we were to experience an unusually high incidence of warranty claims, we could incur significant costs and our business could be adversely affected. In addition, we are exposed to the product and economic liability risks and the risk of negative publicity affecting our customers. Our sales may decline if any of our customers are sued on a product liability claim. We also may suffer a decline in sales from the negative publicity associated with such a lawsuit or with adverse public perceptions in general regarding our customers’ products. Further, if our packages are delivered with impurities or defects, we could incur additional development, repair or replacement costs or suffer other economic losses, and our credibility and the market’s acceptance of our packages could be harmed.

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Risks Associated With International Operations - We Depend on Our Factories and Operations in China, Japan, Korea, Malaysia, the Philippines and Taiwan. Many of Our Customers’ and Vendors’ Operations Are Also Located Outside of the U.S.

We provide packaging and test services through our factories and other operations located in China, Japan, Korea, Malaysia, the Philippines and Taiwan. Substantially all of our property, plant and equipment is located outside of the United States. Moreover, many of our customers and the vendors in our supply chain are located outside the U.S.  The following are some of the risks we face in doing business internationally:

• changes in consumer demand resulting from deteriorating conditions in local economies;

• regulations and policies imposed by U.S. or foreign governments, such as tariffs, customs, duties and other restrictive trade barriers, antitrust and competition, tax, currency and banking, privacy, labor, environmental, health and safety;

• the payment of dividends and other payments by non-U.S. subsidiaries may be subject to prohibitions, limitations or taxes in local jurisdictions;

• fluctuations in currency exchange rates;

• political and social conditions, such as civil unrest and terrorism;

• disruptions or delays in shipments caused by customs brokers or government agencies;

• difficulties in attracting and retaining qualified personnel and managing foreign operations, including foreign labor disruptions;

• difficulty in enforcing contractual rights and protecting our intellectual property rights;

• potentially adverse tax consequences resulting from tax laws in the U.S. and in foreign jurisdictions in which we operate and

• local business and cultural factors that differ from our normal standards and practices, including business practices that we are prohibited from engaging in by the Foreign Corrupt Practices Act (FCPA) and other anti-corruption laws and regulations.

In particular, we have significant facilities and other investments in South Korea, and there have been heightened security concerns in recent years stemming from North Korea’s nuclear weapon and long-range missile programs as well as its military actions in the region. Furthermore, there has been a history of conflict and a recent rise in tensions among other countries in the region.

We Face Risks in Connection with the Continuing Development and Implementation of Changes to, and Maintenance and Security of, Our Management Information Systems.

We depend on our management information systems for many aspects of our business. Some of our key software has been developed by our own programmers, and this software may not be easily integrated with other software and systems. Our systems may be susceptible to damage, disruptions or shutdowns due to failures during the process of upgrading, replacing or maintaining software, databases or components thereof, power outages, hardware failures, computer viruses, attacks by computer hackers, telecommunication failures, user errors, malfeasance or catastrophic events. In addition, security breaches could result in unauthorized disclosure of confidential information. We have made and continue to make significant investments to implement and evolve our management information systems. In addition, we implemented a new shop floor system in certain of our factories. In July 2013, we acquired a factory in Malaysia, and we are integrating its management information systems into our existing systems and processes. We face risks in connection with current and future projects to install or integrate new management information systems or upgrade our existing systems. These risks include:

• we may face delays in the design and implementation of the system;

• the cost of the systems may exceed our plans and expectations and

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• disruptions resulting from the implementation or integration of the systems may impact our ability to process transactions and delay shipments to customers, impact our results of operations or financial condition or harm our control environment.

Our business could be materially and adversely affected if our management information systems are disrupted or if we are unable to successfully install new systems or improve, upgrade, integrate or expand upon our existing systems.

We Face Risks Trying to Attract and Retain Qualified Employees to Support Our Operations.

Our success depends to a significant extent upon the continued service of our key senior management, sales and technical personnel, any of whom may be difficult to replace. Competition for qualified employees is intense, and our business could be adversely affected by the loss of the services of any of our existing key personnel, including senior management, as a result of competition or for any other reason. We do not have employment agreements with our key employees, including senior management or other contracts that would prevent our key employees from working for our competitors in the event they cease working for us. We cannot assure you that we will be successful in our efforts to retain key employees or in hiring and properly training sufficient numbers of qualified personnel and in effectively managing our growth. Our inability to attract, retain, motivate and train qualified new personnel could have a material adverse effect on our business.

Difficulties Consolidating and Integrating Our Operations - We Face Challenges as We Integrate Diverse Operations.

We have experienced, and expect to continue to experience, change in the scope and complexity of our operations resulting primarily from existing and future facility consolidations, strategic acquisitions, joint ventures and other partnering arrangements. Some of the risks from these activities include those associated with the following:

• increasing the scope, geographic diversity and complexity of our operations;

• conforming an acquired company's standards, practices, systems and controls with our operations;

• increasing complexity from combining recent acquisitions of an acquired business;

• unexpected losses of key employees or customers of an acquired business; other difficulties in the assimilation of acquired operations, technologies or products and

• diversion of management and other resources from other parts of our operations and adverse effects on existing business relationships with customers.

In connection with these activities, we may:

• use a significant portion of our available cash;

• issue equity securities, which may dilute the ownership of current stockholders;

• incur substantial debt;

• incur or assume known or unknown contingent liabilities and

• incur large, immediate accounting write offs and face antitrust or other regulatory inquiries or actions.

For example, the businesses we have acquired had, at the time of acquisition, multiple systems for managing their own production, sales, inventory and other operations. Migrating these businesses to our systems typically is a slow, expensive process requiring us to divert significant resources from other parts of our operations. We may continue to face these challenges in the future. For example, on July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. We have also exercised our option to increase our ownership interest in J-Devices from 30% to 60% in 2013 and from 60% to 65.7% in 2015, and we have an additional option to increase our ownership to 80% in 2016. We are integrating the recently acquired operation in Malaysia, and we anticipate that in the future we will need to integrate J-Devices with our existing operations. In addition, J-Devices continues to integrate the acquisitions it has recently completed with its operations. Furthermore, the governance provisions applicable to J-Devices restrict our ability to cause J-Devices to take certain actions without the consent of the other investors. As a result of the risks discussed above, the anticipated benefits of the increase in our investment in J-Devices or other future acquisitions, consolidations and partnering arrangements may not be fully

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realized, if at all, and these activities could have a material adverse effect on our business, financial condition and results of operations.

Dependence on Materials and Equipment Suppliers - Our Business May Suffer If the Cost, Quality or Supply of Materials or Equipment Changes Adversely Including Any Disruption that May Occur in the Supply of Certain Metals due to New Regulations Regarding the Supply of Minerals from Conflict Zones.

We obtain from various vendors the materials and equipment required for the packaging and test services performed by our factories. We source most of our materials, including critical materials such as leadframes, laminate substrates and gold wire, from a limited group of suppliers. A disruption to the operations of one or more of our suppliers could have a negative impact on our business. For example, the severe earthquake and tsunami in Japan in 2011 had a significant adverse effect on the electronics industry supply chain by impacting the supply of specialty chemicals, substrates, silicon wafers, equipment and other supplies to the electronics industry. In addition, we purchase the majority of our materials on a purchase order basis. Our business may be harmed if we cannot obtain materials and other supplies from our vendors in a timely manner, in sufficient quantities, at acceptable quality or at competitive prices. Some of our customers are also dependent on a limited number of suppliers for certain materials and silicon wafers. Shortages or disruptions in our customers' supply channels could have a material adverse effect on our business, financial condition, results of operations and cash flows. For example, the shortage in the supply of 28 nanometer wafers to some of our customers in 2012 delayed or otherwise adversely impacted the demand for certain of our advanced packaging and test services.

Rules adopted by the Securities and Exchange Commission implementing the Dodd-Frank Wall Street Reform and Consumer Protection Act impose diligence and disclosure requirements regarding the use of certain minerals originating from the conflict zones of the Democratic Republic of Congo and adjoining countries in our products. Industry associations and some of our customers are also implementing initiatives to improve transparency and accountability concerning the supply of these materials and, in some cases, requiring us to certify that the covered materials we use in our packages do not come from the conflict areas. We may incur additional costs associated with complying with these requirements and customer initiatives. These requirements and customer initiatives could affect the pricing, sourcing and availability of metals used in the manufacture of semiconductor devices, and we cannot assure you that we will be able to obtain conflict-free materials in sufficient quantities and at competitive prices or that we will be able to verify the origin of all of the metals we use in our manufacturing process. If we are unable to certify that the metals we use in our packages are conflict-free, it could adversely affect our business as some customers may move their business to other suppliers. Our reputation could also be adversely affected.

We purchase new packaging and test equipment to maintain and expand our operations. From time to time, increased demand for new equipment may cause lead times to extend beyond those normally required by equipment vendors. For example, in the past, increased demand for equipment caused some equipment suppliers to only partially satisfy our equipment orders in the normal time frame or to increase prices during market upturns for the semiconductor industry. The unavailability of equipment or failures to deliver equipment on a timely basis could delay or impair our ability to meet customer orders. If we are unable to meet customer orders, we could lose potential and existing customers. Generally, we acquire our equipment on a purchase order basis and do not enter into long-term equipment agreements. As a result, we could experience adverse changes in pricing, currency risk and potential shortages in equipment in a strong market, which could have a material adverse effect on our results of operations.

We are a large buyer of gold and other commodity materials including substrates and copper. The prices of gold and other commodities used in our business fluctuate. Historically, we have been able to partially offset the effect of commodity price increases through price adjustments to some customers and changes in our product designs that reduce the material content and cost, such as the use of shorter, thinner, gold wire and migration to copper wire. However, we typically do not have long-term contracts that permit us to impose price adjustments, and market conditions may limit our ability to do so. Significant price increases may adversely impact our gross margin in future periods to the extent we are unable to pass along past or future commodity price increases to our customers.

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Customer Concentration and Loss of Customers - The Loss of Certain Customers or Reduced Orders or Pricing from Existing Customers May Have a Significant Adverse Effect on Our Operations and Financial Results.

We have derived and expect to continue to derive a large portion of our revenues from a small group of customers during any particular period due in part to the concentration of market share in the semiconductor industry. Our ten largest customers together accounted for 60.9% of our net sales for the year ended December 31, 2014, and two customers each accounted for more than 10% of our consolidated net sales during the period. The loss of a significant customer, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements may result in a decline in our sales and profitability and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

The demand for our services from each customer is directly dependent upon that customer’s level of business activity and purchasing decisions, the quality and price of our services, our cycle time and delivery performance, the customer's qualification of additional competitors on products we package or test and a number of other factors. Each of these factors could vary significantly from year to year resulting in the loss or reduction of customer orders. Our business is likely to remain subject to this variability in order levels, and we cannot assure you that our key customers or any other customers will continue to place orders with us in the future at the same levels as in past periods.

For example, if a key customer decides to purchase wafers from a semiconductor foundry that provides packaging and test services, our business could be reduced if the customer also engages that foundry for related packaging and test services. We cannot assure that customer decisions regarding the purchase of semiconductor wafers will not significantly and adversely impact customer demand for our packaging and test services.

In addition, from time to time we may acquire or build new facilities, such as our new factory and research and development center in Korea, or migrate existing business among our facilities. In connection with these facility changes, our customers require us to re-qualify the new facilities even though we have already qualified to perform the services at our other facilities. We cannot assure that we will successfully re-qualify or that our customers will not qualify our competitors and move the business for such services.

Capital Expenditures - We Make Substantial Investments in Equipment and Facilities To Support the Demand Of Our Customers, Which May Adversely Affect Our Business If the Demand Of Our Customers Does Not Develop As We Expect or Is Adversely Affected.

We make significant investments in equipment and facilities in order to service the demand of our customers. For example, we had capital expenditures of $681.1 million in 2014, $566.3 million in 2013 and $533.5 million in 2012. The amount of our capital expenditures depends on several factors, including the performance of our business, our assessment of future industry and customer demand, our capacity utilization levels and availability, our liquidity position and the availability of financing. Our ongoing capital expenditure requirements may strain our cash and short-term asset balances, and, in periods when we are expanding our capital base, we expect that depreciation expense and factory operating expenses associated with our capital expenditures to increase production capacity will put downward pressure on our gross margin, at least over the near term. From time to time, we also make significant capital expenditures based on specific business opportunities with one or a few key customers, and the additional equipment purchased may not be readily usable to support other customers. If demand is insufficient to fill our capacity, or we are unable to efficiently redeploy such equipment, our capacity utilization and gross margin could be negatively impacted. Our capital expenditures may increase as we transition to new packaging and test technologies because, among other things, new equipment used for these technologies is generally more expensive and often our existing equipment cannot be redeployed in whole or part for these technologies.

Furthermore, if we cannot generate or raise additional funds to pay for capital expenditures, particularly in some of the advanced packaging and bumping areas, as well as research and development activities, our growth and future profitability may be adversely affected. Our ability to obtain external financing in the future is subject to a variety of uncertainties, including:

• our future financial condition, results of operations and cash flows;

• general market conditions for financing;

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• volatility in fixed income, credit and equity markets and

• economic, political and other global conditions.

The lead time needed to order, install and put into service various capital investments is often significant, and, as a result, we often need to commit to capital expenditures in advance of our receipt of firm orders or advance deposits based on our view of anticipated future demand with only very limited visibility. Although we seek to limit our exposure in this regard, in the past we have from time to time expended significant capital for additional equipment or facilities for which the anticipated demand did not materialize for a variety of reasons, many of which were outside of our control. To the extent this occurs in the future, our business, liquidity, results of operations, financial condition and cash flows could be materially adversely affected.

In addition, during periods where customer demand exceeds our capacity, customers may transfer some or all of their business to other suppliers who are able to support their needs. To the extent this occurs, our business, liquidity, results of operations, financial condition and cash flows could be materially adversely affected.

In September 2014, we started the construction of our new K5 facility in Korea. We plan to spend approximately$375 millionfor the construction of the facility in 2015 and 2016, including capitalized interest of $40 million. The land purchase agreement includes various construction, investment, hiring, regulatory and other compliance obligations. There can be no assurance that the new facility will be completed, or that the actual scope, costs, timeline or benefits of the project will be consistent with our current expectations.

Impairment Charges - Any Impairment Charges Required Under U.S. GAAP May Have a Material Adverse Effect on Our Net Income.

Under U.S. GAAP, we review our long-lived assets including property, plant and equipment, intellectual property and other intangibles for impairment when events or changes in circumstances indicate the carrying value may not be recoverable. Factors we consider include significant under-performance relative to expected historical or projected future operating results, significant negative industry or economic trends and our market capitalization relative to net book value. We may be required in the future to record a significant charge to earnings in our financial statements during the period in which any impairment of our long-lived assets is determined. Such charges have had and could have a significant adverse impact on our results of operations and our operating flexibility under our debt covenants.

Litigation Incident to Our Business Could Adversely Affect Us.

We have been a party to various legal proceedings, including those described in Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K, and may be a party to legal proceedings in the future. These proceedings could require significant management time and resources and, if an unfavorable ruling or outcome were to occur in these legal proceedings, there could be a material adverse impact on our business, liquidity, results of operations, financial condition, cash flows and the trading price of our securities.

We Could Suffer Adverse Tax and Other Financial Consequences if There Are Changes in Tax Laws or Taxing Authorities Do Not Agree with Our Interpretation of Applicable Tax Laws, Including Whether We Continue to Qualify for Our Tax Holidays.

Our operations are subject to tax in multiple jurisdictions with complicated and varied tax regimes. Tax laws and income tax rates in these jurisdictions are subject to change due to economic and political conditions. Changes in U.S. or foreign tax laws could have a material adverse impact on our liquidity, results of operations, financial condition and cash flows. For example, there have been proposals to change U.S. tax laws that would significantly impact how U.S. corporations are taxed on foreign earnings. We earn a substantial portion of our income in foreign countries. Although we cannot predict whether or in what form any of these proposals might be enacted into law, if adopted they could have a material adverse impact.

Our corporate structure and operations are based, in part, on interpretations of various U.S. and foreign tax laws, including withholding tax, compliance with tax holiday requirements, application of changes in tax law to our operations and other relevant laws of applicable taxing jurisdictions. From time to time, the taxing authorities of the relevant jurisdictions may

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conduct examinations of our income tax returns and other regulatory filings. We cannot assure you that the taxing authorities will agree with our interpretations, including whether we continue to qualify for our tax holidays. To the extent they do not agree, we may seek to enter into settlements with the taxing authorities which require significant payments or otherwise adversely affect our results of operations or financial condition. We may also appeal the taxing authorities’ determinations to the appropriate governmental authorities, but we cannot be sure we will prevail. If we do not prevail, we may have to make significant payments or otherwise record charges (or reduce tax assets) that adversely affect our results of operations, financial condition and cash flows. Additionally, certain of our subsidiaries operate under tax holidays, which will expire in whole or in part at various dates in the future. As those tax holidays expire, our tax expense will increase as income from those jurisdictions becomes subject to higher statutory income tax rates, thereby reducing our liquidity and cash flow.

Intellectual Property - Our Business Will Suffer if We Are Not Able to Develop New Proprietary Technology, Protect Our Proprietary Technology and Operate Without Infringing the Proprietary Rights of Others.

The complexity and breadth of semiconductor packaging and test services are rapidly increasing. As a result, we expect that we will need to develop, acquire and implement new manufacturing processes and packaging technologies and tools in order to respond to competitive industry conditions and customer requirements. Technological advances also typically lead to rapid and significant price erosion and may make our existing packages less competitive or our existing inventories obsolete. If we cannot achieve advances in packaging design or obtain access to advanced packaging designs developed by others, our business could suffer.

The need to develop and maintain advanced packaging capabilities and equipment could require significant research and development, capital expenditures and acquisitions in future years. In addition, converting to new packaging designs or process methodologies could result in delays in producing new package types, which could adversely affect our ability to meet customer orders and adversely impact our business.

The process of seeking patent protection takes a long time and is expensive. There can be no assurance that patents will issue from pending or future applications or that, if patents are issued, the rights granted under the patents will provide us with meaningful protection or any commercial advantage. Any patents we do obtain will eventually expire, may be challenged, invalidated or circumvented and may not provide meaningful protection or other commercial advantage to us.

Some of our technologies are not covered by any patent or patent application. The confidentiality agreements on which we rely to protect these technologies may be breached and may not be adequate to protect our proprietary technologies. There can be no assurance that other countries in which we market our services will protect our intellectual property rights to the same extent as the U.S.

Our competitors may develop, patent or gain access to know-how and technology similar or superior to our own. In addition, many of our patents are subject to cross licenses, several of which are with our competitors. The semiconductor industry is characterized by frequent claims regarding the infringement of patent and other intellectual property rights. If any third party makes an enforceable infringement claim against us or our customers, we could be required to:

• discontinue the use of certain processes or cease to provide the services at issue, which could curtail our business;

• pay substantial damages;

• develop non-infringing technologies, which may not be feasible or

• acquire licenses to such technology, which may not be available on commercially reasonable terms or at all.

We may need to enforce our patents or other intellectual property rights, including our rights under patent and intellectual property licenses with third parties, or defend ourselves against claimed infringement of the rights of others through litigation, which could result in substantial cost and diversion of our resources. Furthermore, if we fail to obtain necessary licenses, our business could suffer, and we could be exposed to claims for damages and injunctions from third parties, as well as claims from our customers for indemnification. We have been involved in legal proceedings involving the acquisition and license of intellectual property rights, the enforcement of our existing intellectual property rights or the enforcement of the intellectual property rights of others, including the recently settled legal proceedings with Tessera, Inc., which is described in more detail in Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K. Unfavorable outcomes in any legal proceedings involving intellectual property could result in significant liabilities and

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could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows. The potential impact from the legal proceedings referred to in this Annual Report on Form 10-K on our results of operations, financial condition and cash flows could change in the future.

Packaging and Test Processes Are Complex and Our Production Yields and Customer Relationships May Suffer from Defects in the Services We Provide or if We do Not Successfully Implement New Technologies.

Semiconductor packaging and test services are complex processes that require significant technological and process expertise. Defective packages primarily result from:

• contaminants in the manufacturing environment;

• human error;

• equipment malfunction;

• changing processes to address environmental requirements;

• defective raw materials or

• defective plating services.

Test is also complex and involves sophisticated equipment and software. Similar to many software programs, these software programs are complex and may contain programming errors or “bugs.” The test equipment is also subject to malfunction. In addition, the test process is subject to operator error.

These and other factors have, from time to time, contributed to lower production yields. They may also do so in the future, particularly as we adjust our capacity, change our processing steps or ramp new technologies. In addition, we must continue to develop and implement new packaging and test technologies, and expand our offering of packages to be competitive. Our production yields on new packages, particularly those packages which are based on new technologies, typically are significantly lower than our production yields on our more established packages.

Our failure to maintain quality standards or acceptable production yields, if significant and prolonged, could result in loss of customers, increased costs of production, delays, substantial amounts of returned goods and claims by customers relating thereto. Any of these problems could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

In addition, in line with industry practice, new customers usually require us to pass a lengthy and rigorous qualification process that may take several months. If we fail to qualify packages with potential customers or existing customers, such failure could have a material adverse effect on our business, results of operations, financial condition and cash flows.

Competition - We Compete Against Established Competitors in the Packaging and Test Business as Well as Internal Customer Capabilities and May Face Competition from New Competitors.

The outsourced semiconductor packaging and test market is very competitive. We face substantial competition from established and emerging packaging and test service providers primarily located in Asia, including companies with significant processing capacity, financial resources, local presence, research and development operations, marketing, technology and other capabilities. These companies may also have established relationships with many large semiconductor companies that are our current or potential customers. Consolidation among our competitors could also strengthen their competitive position.

We also face competition from the internal capabilities and capacity of many of our current and potential IDM customers. In addition, we compete with companies (including semiconductor foundries) that provide wafer bumping and other advanced packaging solutions that compete with our packaging and test services. For example, one of the major semiconductor foundries, which is substantially larger and has greater financial resources than we do, has expanded, and may continue to expand its operations to include packaging and test services.

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We cannot assure you that we will be able to compete successfully in the future against our existing or potential competitors or that our customers will not rely on internal sources for packaging and test services, or that our business, liquidity, results of operations, financial condition and cash flows will not be adversely affected by such increased competition.

Environmental, Health & Safety Laws and Initiatives - Future Environmental, Health & Safety Laws and Initiatives Could Place Additional Burdens on Our Manufacturing Operations.

The semiconductor packaging process generates by-products that are subject to extensive governmental regulations. For example, at our foreign facilities we produce liquid waste when semiconductor wafers are diced into chips with the aid of diamond saws, then cooled with running water. In addition, semiconductor packages have historically utilized metallic alloys containing lead (Pb) within the interconnect terminals typically referred to as leads, pins or balls. Environmental, health and safety laws and regulations in places we do business, impose various controls on the use, storage, handling, discharge and disposal of chemicals used in our production processes and on the factories we occupy and are increasingly imposing restrictions on the materials contained in semiconductor products. We may become liable under these environmental, health and safety laws and regulations for the cost of compliance and cleanup of any disposal or release of hazardous materials arising out of our former or current operations, or otherwise as a result of the existence of hazardous materials on our properties. In such an event, we could be held liable for damages, including fines, penalties and the cost of investigations and remedial actions, and could also be subject to revocation of permits negatively affecting our operations.

Public attention has focused on the environmental impact of semiconductor operations and the risk to neighbors of chemical releases from such operations and to the materials contained in semiconductor products. For example, the European Union’s Restriction of Use of Certain Hazardous Substances in Electrical and Electronic Equipment Directive and similar laws in other jurisdictions impose strict restrictions on the use of lead and other hazardous substances in electrical and electronic equipment. In addition, increasing climate change and environmental concerns could result in our customers requesting that we exceed regulatory standards. Complying with existing and possible future environmental, health and safety laws or related customer requests may impose upon us the need for additional equipment or other process requirements, restrict our ability to expand our operations, disrupt our operations, increase costs, subject us to liability or cause us to curtail our operations. Furthermore, energy costs in general could increase significantly due to climate change and other regulations.

Our Business and Financial Condition Could be Adversely Affected by Natural Disasters and Other Calamities.

We have significant packaging and test and other operations in locations which are subject to natural disasters, such as earthquakes, tsunamis, typhoons, floods, droughts, volcanoes and other severe weather and geological events, and other calamities, such as fire; the outbreak of infectious diseases (such as Ebola, SARs or flu); industrial strikes; breakdowns of equipment; difficulties or delays in obtaining materials, equipment, utilities and services; political events; acts of war and terrorist incidents; industrial accidents and other events, that could disrupt or even shutdown our operations. In addition, our suppliers and customers also have significant operations in such locations. In the event of such a disruption or shutdown, we may be unable to reallocate production to other facilities in a timely or cost-effective manner (if at all) and we may not have sufficient capacity to service customer demands in our other facilities. A natural disaster or other calamity that results in a prolonged disruption to our operations, or the operations of our customers or suppliers, could have a material adverse effect on our business, financial condition, results of operations and cash flows. For example, Japan experienced a severe earthquake and tsunami in 2011 that resulted in significant disruption in the electronics industry supply chain and adversely affected Japan's economy and consumer spending. In addition, in October 2011, Thailand experienced substantial flooding which affected the facilities and operations of customers and suppliers in our industry. In addition, some of the processes that we utilize in our operations place us at risk of fire and other damage. For example, highly flammable gases are used in the preparation of wafers holding semiconductor devices for flip chip packaging. Although we maintain insurance policies for various types of property, casualty and other risks, we do not carry insurance for all the above referred risks and with regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be adversely affected by natural disasters and other calamities.

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Mr. James J. Kim and Members of His Family Can Effectively Determine or Substantially Influence The Outcome of All Matters Requiring Stockholder Approval.

As of December 31, 2014, Mr. James J. Kim, the Executive Chairman of our Board of Directors, members of Mr. Kim’s immediate family and affiliates owned approximately 137.6 million shares, or approximately 58%, of our outstanding common stock. In June 2013, the Kim family exchanged their 2014 Notes for approximately 49.6 million shares of common stock (the "2014 Convert Shares"). The Kim Family also has options to acquire approximately 0.5 million shares. If the options are exercised, the Kim family's total ownership would be an aggregate of approximately 138.0 million shares of our outstanding common stock or approximately 58% of our outstanding common stock.

The 2014 Convert Shares are subject to a voting agreement. The agreement requires the Kim family to vote these shares in a “neutral manner” on all matters submitted to our stockholders for a vote, so that such 2014 Convert Shares are voted in the same proportion as all of the other outstanding securities (excluding the other shares owned by the Kim family) that are actually voted on a proposal submitted to Amkor’s stockholders for approval. The Kim family is not required to vote in a “neutral manner” any 2014 Convert Shares that, when aggregated with all other voting shares held by the Kim family, represent 41.6% or less of the total then-outstanding voting shares of our common stock. The voting agreement for the 2014 Convert Shares terminates upon the earliest of (i) such time as the Kim family no longer beneficially owns any of the 2014 Convert Shares, (ii) consummation of a change of control (as defined in the voting agreement) or (iii) the mutual agreement of the Kim family and Amkor.

Mr. James J. Kim and his family and affiliates, acting together, have the ability to effectively determine or substantially influence matters submitted for approval by our stockholders by voting their shares or otherwise acting by written consent, including the election of our Board of Directors. There is also the potential, through the election of members of our Board of Directors, that the Kim family could substantially influence matters decided upon by our Board of Directors. This concentration of ownership may also have the effect of impeding a merger, consolidation, takeover or other business consolidation involving us, or discouraging a potential acquirer from making a tender offer for our shares, and could also negatively affect our stock’s market price or decrease any premium over market price that an acquirer might otherwise pay. Concentration of ownership also reduces the public float of our common stock. There may be less liquidity and higher price volatility for the stock of companies with a smaller public float compared to companies with broader public ownership.

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Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

The location and size of our manufacturing facilities are set forth in the table below. All facilities are owned unless otherwise specified.

	Approximate Facility Size (Square Feet)
Korea
Gwangju, Korea	1,241,000
Seoul, Korea	668,000
Pupyong, Korea (1)	448,000
Philippines
Muntinlupa, Philippines (2)	648,000
Province of Laguna, Philippines (2)	633,000
China
Shanghai, China (3)	915,000
Taiwan
Hsinchu, Taiwan	489,000
Lung Tan, Taiwan	353,000
Malaysia
Telok Panglima Garang, Malaysia (3)	377,000
Total all facilities	5,772,000

(1) Includes a lease for 44,000 square feet of building space.

(2) As a result of foreign ownership restrictions in the Philippines, the land is leased. A portion of the land we lease is owned by realty companies in which we own a 40% interest. We also lease 648,000 square feet of building space.

(3) Land is leased.

During 2013, we purchased land for a factory and research and development center in Korea and in September 2014, we started construction. Construction work is expected to continue into 2016.

J-Devices, our 65.7% owned equity-method joint venture in Japan, operates 13 manufacturing facilities with a total of 3.6 million square feet of space. This includes 0.9 million square feet of leased building space.

Our principal executive office and operational headquarters is located in Tempe, Arizona. In addition to executive staff, the Tempe, Arizona campus houses sales and customer service for the southwest region, product management, finance, information systems, planning and marketing. Our marketing and sales office locations include sites at most of our manufacturing locations as well as Europe, Singapore and the U.S. (Tempe, Arizona; Irvine, San Diego and Santa Clara, California; Boston, Massachusetts and Dallas, Texas).

We believe that our existing properties are in good condition and suitable for the conduct of our business and that the productive capacity of such properties is substantially being utilized or we have plans to utilize it.

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Item 3. Legal Proceedings

From time to time, we may become involved in various disputes and litigation matters that arise in the ordinary course of our business. These include disputes and lawsuits related to intellectual property, acquisitions, licensing, contracts, tax, regulatory, employee relations and other matters. For a discussion of “Legal Proceedings,” see Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

Item 4. Mine Safety Disclosures

Not applicable.

PART II

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

LISTING ON THE NASDAQ GLOBAL SELECT MARKET

Our common stock is traded on the NASDAQ Global Select Market under the symbol “AMKR.” The following table sets forth, for the periods indicated, the high and low sale prices per share of our common stock as quoted on the NASDAQ Global Select Market.

	High		Low
2014
First Quarter	$	6.86	$	5.12
Second Quarter	12.21		6.88
Third Quarter	11.44		8.41
Fourth Quarter	8.61		5.97
2013
First Quarter	$	4.99	$	3.99
Second Quarter	4.63		3.60
Third Quarter	4.61		4.01
Fourth Quarter	6.13		4.35

There were approximately 145 holders of record of our common stock as of January 30, 2015.

DIVIDEND POLICY

Since our public offering in 1998, we have never paid a dividend to our stockholders, and we do not have any present plans for doing so. In addition, our U.S. revolving credit agreement and the indentures governing our senior notes limit our ability to pay dividends. Refer to the Liquidity and Capital Resources section in Item 7 of this Annual Report on Form 10-K.

RECENT SALES OF UNREGISTERED SECURITIES

None.

EQUITY COMPENSATION PLANS

The information required by this item regarding equity compensation plans is set forth in Part III, Item 12 of this Annual Report on Form 10-K.

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PURCHASES OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PURCHASERS

The following table provides information regarding repurchases of our common stock during the three months ended December 31, 2014.

Period	Total Number of Shares Purchased (a)	Average Price Paid Per Share ($)		Total Number of Shares Purchased as part of Publicly Announced Plans or Programs (b)	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($) (b)
October 1-October 31	—	$	—	—	$	91,586,032
November 1-November 30	35,778	6.45		—	91,586,032
December 1-December 31	46	7.19		—	91,586,032
Total	35,824	$	6.46	—

(a) Represents shares of common stock surrendered to us to satisfy tax withholding obligations associated with the vesting of restricted shares issued to employees.

(b) Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, $150.0 million in August 2011 and $150.0 million in February 2012, exclusive of any fees, commissions or other expenses. During 2013 and 2014, we made no common stock purchases, and at December 31, 2014, approximately $91.6 million was available pursuant to the stock repurchase program.

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PERFORMANCE GRAPH(1)

(1) The preceding Stock Performance Graph is not deemed filed with the Securities and Exchange Commission and shall not be incorporated by reference in any of our filings under the Securities Act of 1933 or the Securities Exchange Act of 1934, as amended, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.

	Year Ended December 31,
	2009		2010		2011		2012		2013		2014
Amkor Technology, Inc.	$	100.00	$	103.49	$	60.89	$	59.23	$	85.61	$	99.16
S&P 500	100.00		115.06		117.49		136.30		180.44		205.14
PHLX Semiconductor	100.00		115.11		116.95		129.28		169.57		215.25

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Item 6. Selected Consolidated Financial Data

The following selected consolidated financial data as of December 31, 2014 and 2013, and for the years ended December 31, 2014, 2013 and 2012, have been derived from our audited Consolidated Financial Statements included in this Annual Report on Form 10-K. The following selected consolidated financial data as of December 31, 2012, 2011 and 2010, and for the years ended December 31, 2011 and 2010, have been derived from audited financial statements not included herein. You should read the selected consolidated financial data in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations and our Consolidated Financial Statements in Part II, Item 7 and Item 8, respectively, of this Annual Report on Form 10-K.

SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA

	For the Year Ended December 31,
	2014 (c)		2013 (d)		2012		2011		2010
	(In thousands, except per share data)
Income Statement Data:
Net sales	$	3,129,440	$	2,956,450	$	2,759,546	$	2,776,359	$	2,939,483
Gross profit (a)	552,822		544,513		423,810		490,569		663,756
Operating income	221,460		232,109		152,692		193,670		373,798
Loss on debt retirement (b)	757		12,330		1,199		15,531		18,042
Income tax expense	33,845		22,646		17,001		7,124		19,012
Equity in earnings of J-Devices (c)	31,654		10,316		5,592		7,085		6,435
Net income (a) (c)	133,887		111,657		42,702		93,095		232,147
Net income attributable to Amkor	130,386		109,296		41,818		91,808		231,971
Net income attributable to Amkor per common share:
Basic	$	0.56	$	0.58	$	0.26	$	0.48	$	1.26
Diluted	$	0.55	$	0.50	$	0.24	$	0.39	$	0.91
Other Financial Data:
Depreciation and amortization	$	464,706	$	410,346	$	370,479	$	335,644	$	323,608
Payments for property, plant and equipment	681,120		566,256		533,512		466,694		445,669
Balance Sheet Data:
Cash and cash equivalents	$	449,946	$	610,442	$	413,048	$	434,631	$	404,998
Working capital	497,358		541,480		438,781		354,644		289,859
Total assets	3,635,405		3,427,298		3,025,215		2,773,047		2,736,822
Non-current liabilities, including debt	1,803,879		1,771,422		1,705,794		1,429,640		1,327,933
Total Amkor stockholders’ equity	1,116,235		953,740		657,955		693,266		630,013

(a) In January 2015, we reached a resolution to a patent license dispute and entered into a settlement agreement. During 2014, 2013 and 2012 we recorded charges of $75.3 million, $10.0 million and $50.0 million, respectively, to cost of sales and $13.7 million, $1.8 million, and $6.0 million, respectively, to interest expense relating to this patent license dispute.

(b) During 2013, we exchanged debt for shares of our common stock and a cash payment and recorded a charge of $11.6 million. During 2011, we recorded a net loss of $15.5 million related to the tender and call of debt and the write-off of associated unamortized deferred debt issuance costs. During 2010, we recorded a net loss of $18.0 million related to several debt transactions.

(c) On June 30, 2014, we sold 100% of the shares of our previously wholly-owned subsidiary in Japan to J-Devices, our equity-method joint venture in Japan. Subsequent to June 30, 2014, the results of the divested entity are included in J-Devices' financial results and in our corresponding equity in earnings of J-Devices. We recognized a net gain on the sale of $9.2 million in other (income) expense, net. In addition, J-Devices recognized a gain on the transaction, which increased our equity in earnings of J-Devices by $8.8 million. The combined net gain we recognized was $18.0 million.

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(d) On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. The financial results of the entity have been included in our Consolidated Financial Statements from the date of acquisition.

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

Overview

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Our financial goals are sales growth and improved profitability, and we are focusing on the following strategies to achieve these goals: capitalizing on our investments in services for advanced technologies, improving utilization of existing assets and selectively growing our scale and scope through strategic investments.

We are an industry leader in developing and commercializing cost-effective advanced packaging and test technologies. These advanced technology solutions provide increased value to our customers while typically generating gross margins above our corporate average. This is particularly true in the mobile device market, where growth has outpaced the semiconductor industry rate. Advanced packages are now the preferred choice in both the high-end and the mid-range segments of the smartphone market, which together account for a high portion of mobile phone semiconductor value. The demand for advanced packages is also being driven by second-wave mobile device customers, who are transitioning out of wirebond into wafer-level and flip-chip packages. Our technology leadership and this technology transition create significant growth opportunities for us.

We typically look for opportunities in the advanced packaging and test area where we can generate reasonably quick returns on investments made for customers seeking leading edge technologies. We also focus on developing a second wave of customers to fill the capacity that becomes available when leading edge customers transition to newer packaging and test equipment and platforms. For example, we are currently working to expand our sales to Chinese and Taiwanese fabless chip companies that make up a significant portion of the mid-tier and entry-level segments of the mobile device market where much of the growth is occurring. In addition, we are seeking out new customers and deepening our engagement with existing customers. This includes an expanded emphasis on the automotive market where semiconductor content continues to grow and in the analog area for our mainstream wirebond technologies.

From time to time we identify attractive opportunities to grow our customer base and expand the markets we serve. For example, in 2009 we invested in J-Devices Corporation, a joint venture to provide semiconductor packaging and test services in Japan. We increased our investment in J-Devices to 60% in 2013 and to 65.7% in 2015. In 2013, we acquired Toshiba’s power discrete semiconductor packaging and test factory in Malaysia. In addition to adding a new revenue stream from our then existing customer, Toshiba, we are now also servicing other customers in this factory. We believe that selective growth through joint ventures, acquisitions and other strategic investments can help diversify our revenue streams, improve our profits and continue our technological leadership.

Our IDM customers include: Intel Corporation; Micron Technology, Inc.; STMicroelectronics N.V.; Texas Instruments Incorporated and Toshiba Corporation. Our fabless customers include: Altera Corporation; Avago Technologies; Broadcom Corporation and Qualcomm Incorporated. Our contract foundry customers include: GlobalFoundries Inc. and Taiwan Semiconductor Manufacturing Company Limited.

Our business is impacted by market conditions in the semiconductor industry, which is cyclical and impacted by broad economic factors, such as world-wide gross domestic product and consumer spending. Historical trends indicate there has been a strong correlation between world-wide gross domestic product levels, consumer spending and semiconductor industry cycles. The semiconductor industry has experienced significant and sometimes prolonged cyclical downturns in the past. We cannot predict the timing, strength or duration of any economic slowdown or subsequent economic recovery.

Our net sales, gross profit, operating income, cash flows, liquidity and capital resources have historically fluctuated significantly from quarter to quarter as a result of many factors, including the seasonality of our business, the cyclical nature of the semiconductor industry and other factors discussed in Part 1, Item 1A of this Annual Report on Form 10-K.

We operate in a capital intensive industry and have a significant level of debt. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures, which are

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generally made in advance of the related revenues and without firm customer commitments. We fund our operations, including capital expenditures and debt service requirements, with cash flows from operations, existing cash and cash equivalents, borrowings under available credit facilities and proceeds from any additional financing. Maintaining an appropriate level of liquidity is important to our business and depends on, among other things, the performance of our business, our capital expenditure levels and our ability to repay debt out of our operating cash flows or proceeds from debt or equity financings.

2014 Financial Highlights

Our net sales increased $173.0 million or 5.9% to $3,129.4 million in 2014 from $2,956.5 million in 2013. The increase in net sales in 2014 compared to 2013 was the result of strong demand for wafer services supporting mobile communications, a full year of results from our power discrete business in Malaysia acquired in mid-2013, strong demand for NAND memory and growth in our automotive business.

Gross margin in 2014 benefitted primarily from higher net sales and increased utilization. Gross margin was negatively impacted by 2.4 percentage points in 2014 for charges related to the settlement of patent license litigation in January 2015.

On June 30, 2014, we completed the sale of our Japanese subsidiary to J-Devices, our equity-method joint venture in Japan. The results of the divested entity subsequent to June 30, 2014 are included in J-Devices' financial results and in our corresponding equity in earnings of J-Devices. As a result of this transaction, we recognized a net gain of $9.2 million, which included the release of accumulated foreign currency translation adjustments associated with the sold entity. J-Devices also recognized a gain of $14.7 million on the transaction as the fair value of the net assets acquired in excess of the purchase price, which resulted in an increase in our equity in earnings of J-Devices of $8.8 million. The combined net gain we recognized for the year ended December 31, 2014, was $18.0 million.

In 2014, our capital expenditures totaled $681.1 million, or 21.8% of net sales, compared to $566.3 million, or 19.2% of net sales in 2013. Our 2014 capital expenditures were primarily focused on investments in advanced packaging and test equipment supporting mobile communications and construction of our new factory and research and development center in Korea.

Net cash provided by operating activities was $613.9 million for the year ended December 31, 2014, compared to $557.5 million for the year ended December 31, 2013. The increase is mainly attributable to revenue growth and improved profitability, partially offset by an increase in working capital.

Results of Operations

The following table sets forth certain operating data as a percentage of net sales for the periods indicated:

	Year Ended December 31,
	2014		2013		2012
Net sales	100.0	%	100.0	%	100.0	%
Materials	36.8	%	40.0	%	43.2	%
Labor	14.0	%	14.4	%	14.3	%
Other manufacturing costs	29.1	%	26.8	%	25.3	%
Patent license litigation	2.4	%	0.4	%	1.8	%
Gross margin	17.7	%	18.4	%	15.4	%
Operating income	7.1	%	7.9	%	5.5	%
Income before income taxes and equity in earnings of unconsolidated affiliate	4.3	%	4.2	%	2.0	%
Net income attributable to Amkor	4.2	%	3.7	%	1.5	%

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Net Sales

							Change
	2014		2013		2012		2014 over 2013				2013 over 2012
	(In thousands, except percentages)
Net sales	$	3,129,440	$	2,956,450	$	2,759,546	$	172,990	5.9	%	$	196,904	7.1	%

The increase in net sales in 2014 compared to 2013 was driven by strong demand for wafer services supporting mobile communications, a full year of results from our power discrete business in Malaysia acquired in mid-2013, strong demand for NAND memory and growth in our automotive business.

The increase in net sales in 2013 compared to 2012 was attributable to strong demand for wafer-level processing, wirebond NAND memory and flip chip services for mobile communications. The increase in net sales in 2013 was also a result of incremental business from our newly acquired power discrete business in Malaysia. These increases were offset by weakness in demand for products in the consumer end market, including gaming and home electronics.

Gross Margin

										Change
	2014			2013			2012			2014 over 2013			2013 over 2012
	(In thousands, except percentages)
Gross profit	$	552,822		$	544,513		$	423,810		$	8,309		$	120,703
Gross margin	17.7		%	18.4		%	15.4		%	(0.7		)%	3.0		%

Our cost of sales consists principally of materials, labor, depreciation and manufacturing overhead. Since a substantial portion of the costs at our factories is fixed, relatively modest increases or decreases in capacity utilization rates can have a significant effect on our gross margin.

Gross margin in 2014 benefitted from higher net sales, increased utilization and lower costs for gold, which is used in many of our wirebond products.

The increase in 2013 was primarily driven by higher net sales and the improved mix of wafer-level processing, test and NAND memory services. Gross margin in 2013 also benefitted from lower costs for gold.

Gross margin was negatively impacted by 2.4, 0.4 and 1.8 percentage points in 2014, 2013 and 2012, respectively, for charges related to the settlement of patent license litigation in January 2015.

Selling, General and Administrative Expenses

							Change
	2014		2013		2012		2014 over 2013				2013 over 2012
	(In thousands, except percentages)
Selling, general and administrative	$	254,498	$	247,779	$	217,000	$	6,719	2.7	%	$	30,779	14.2	%

Selling, general and administrative expenses increased in 2014 compared to 2013. The increase was primarily a result of the inclusion of a full year of costs from our power discrete business in Malaysia acquired in mid-2013, partially offset by lower professional fees associated with acquisitions and investments. Selling, general and administrative expenses increased in 2013 compared to 2012. The increase was driven by higher employee compensation costs as well as professional fees associated with litigation and acquisitions.

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Research and Development

							Change
	2014		2013		2012		2014 over 2013				2013 over 2012
	(In thousands, except percentages)
Research and development	$	76,864	$	64,625	$	54,118	$	12,239	18.9	%	$	10,507	19.4	%

Research and development activities are focused on developing new packaging solutions and test services and improving the efficiency and capabilities of our existing production processes.

Research and development expenses in 2014 increased compared to 2013 primarily attributable to the development activities related to 20 nanometer chipsets with strategic customers that moved into production during the period, increased depreciation expense from research and development investments and higher employee compensation costs. Research and development expenses in 2013 increased compared to 2012 as a result of expanded development activities with strategic customers along with additional depreciation expense resulting from continued investments and higher employee compensation expense.

Other Income and Expense

								Change
	2014			2013		2012		2014 over 2013					2013 over 2012
	(In thousands, except percentages)
Interest expense, including related party	$	109,925		$	105,908	$	97,943	$	4,017		3.8	%	$	7,965	8.1	%
Other (income) expense, net	(24,543		)	2,214		638		(26,757		)	>(100%)		1,576		>100%
Total other expense, net	$	85,382		$	108,122	$	98,581	$	(22,740	)	(21.0	)%	$	9,541	9.7	%

Interest expense increased in 2014 primarily due to the settlement of patent license litigation. In addition, it increased due to an increase in our senior notes which occurred in 2013, which is offset by a decrease due to the April 2014 conversion of $56.3 million and the June 2013 exchange of $193.7 million of our 6.0% Convertible senior subordinated notes for shares of our common stock. In 2014 and 2013, we capitalized a portion of the interest on our outstanding debt in the amount of $6.9 million and $1.7 million, respectively, in connection with the construction of our new K5 facility in Korea. Interest expense in 2013 increased compared to 2012 due to higher levels of long-term debt. The additional interest expense was partially offset by interest savings from the June 2013 exchange.

Other (income) expense, net in 2014 included net foreign currency gains at various Asian subsidiaries due to favorable exchange rate movements and a net gain on the sale of a subsidiary to J-Devices. Other (income) expense, net in 2013 included a debt retirement charge related to the cash payment we made to holders of the 6.0% Convertible senior subordinated notes. During 2013, we also recorded a net foreign currency gain, which was mainly a result of the depreciation of the Japanese yen relative to the U.S. dollar and the associated impact on our U.S. dollar denominated net monetary assets.

Income Tax Expense

							Change
	2014		2013		2012		2014 over 2013				2013 over 2012
	(In thousands, except percentages)
Income tax expense	$	33,845	$	22,646	$	17,001	$	11,199	49.5	%	$	5,645	33.2	%

Generally, our effective tax rate is below the U.S. federal tax rate of 35% because we have experienced tax losses in the U.S. and much of our income is taxed in foreign jurisdictions where we benefit from tax holidays or tax rates lower than the U.S. statutory rate. Our income tax expense is attributable to income tax on profits earned in certain foreign jurisdictions, foreign withholding taxes and minimum taxes. The increase in income tax expense in 2014 is primarily attributable to changes in geographic income mix. The increase in income tax expense in 2013 is attributable to an increase in operating income, an increase in income tax rates in a jurisdiction where the tax holiday has expired and additions to our uncertain

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tax positions, partially offset by the release of a valuation allowance in a foreign jurisdiction and the utilization of net operating loss carryforwards.

Our income tax expense reflects the applicable tax rates in effect in the various countries around the world where our income is earned and is subject to volatility depending on the relative jurisdictional mix of earnings. Our subsidiaries in Korea, Malaysia, the Philippines and Taiwan operate under tax holidays. We expect our effective tax rate to increase as the tax holidays expire at various dates through 2022.

In connection with our investment in Korea, we intend to increase our capital in Korea within two years by at least $100 million through foreign investment pursuant to the Foreign Investment Promotion Act thereby, availing ourselves of certain additional tax incentives.

See Note 7 to our Consolidated Financial Statements included in Part II, Item 8 of this Annual Report on Form 10-K for additional information about our income tax expense.

Equity in Earnings of J-Devices

							Change
	2014		2013		2012		2014 over 2013			2013 over 2012
	(In thousands, except percentages)
Equity in earnings of J-Devices	$	31,654	$	10,316	$	5,592	$	21,338	>100%	$	4,724	84.5	%

In April 2013, we increased our ownership interest in J-Devices from 30% to 60%. Additionally, in June 2013, J-Devices acquired three packaging and test facilities from Renesas and in June 2014, J-Devices acquired our Japanese subsidiary. Our equity in earnings of J-Devices for 2014 includes $8.8 million of additional equity in earnings resulting from the gain on J-Devices' purchase of our subsidiary and $8.1 million from the settlement of a take-or-pay arrangement under a manufacturing services agreement.

Quarterly Results

The following table sets forth our unaudited consolidated financial data for the last eight quarters ended December 31, 2014. Our results of operations have varied and may continue to vary from quarter to quarter and are not necessarily indicative of the results of any future period. Our net sales, gross profit and operating income are generally lower in the first quarter of the year as compared to the fourth quarter of the preceding year primarily due to the effect of consumer buying patterns in Asia, Europe and the U.S.

We believe that we have included all adjustments, consisting only of normal recurring adjustments necessary for a fair statement of our selected quarterly data. You should read our selected quarterly data in conjunction with our Consolidated Financial Statements and the related notes, included in Part II, Item 8 of this Annual Report on Form 10-K.

In January 2015, we settled patent license litigation. We recorded a charge of $75.3 million to cost of sales and $11.8 million to interest expense for the three months ended December 31, 2014. During the three months ended September 30, 2013, we recorded a charge of $10.0 million to cost of sales and $1.0 million to interest expense related to the same litigation. On June 30, 2014, we sold 100% of the shares of our previously wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan to J-Devices. Subsequent to June 30, 2014, the results of the divested entity are included in J-Devices' financial results and in our corresponding equity in earnings of J-Devices. On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. The financial results of the entity have been included in our Consolidated Financial Statements from the date of acquisition.

The calculation of basic and diluted per share amounts for each quarter is based on the weighted average shares outstanding for that period; consequently, the sum of the quarters may not necessarily be equal to the full year basic and diluted net income per share.

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	For the Quarter Ended
	Dec. 31, 2014		Sept. 30, 2014		June 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sept. 30, 2013		June 30, 2013			Mar. 31, 2013
	(In thousands, except per share data)
Net sales	$	853,113	$	812,824	$	767,459	$	696,044	$	754,875	$	767,987	$	746,059		$	687,529
Gross profit	120,071		153,217		150,714		128,820		150,173		141,008		138,379			114,953
Operating income	39,968		75,180		60,961		45,351		74,554		58,014		58,453			41,088
Loss on debt retirement, net	—		—		622		135		711		—		11,619			—
Income tax expense (benefit)	1,420		14,985		12,511		4,929		16,685		12,170		(10,238		)	4,029
Equity in earnings of J-Devices	2,485		3,372		20,036		5,761		5,637		3,179		1,445			55
Net income	14,128		48,170		50,406		21,183		41,558		26,004		30,329			13,766
Net income attributable to Amkor	13,135		47,097		49,521		20,633		40,838		25,349		29,727			13,382
Net income attributable to Amkor per common share:
Basic	$	0.06	$	0.20	$	0.21	$	0.09	$	0.19	$	0.12	$	0.18		$	0.09
Diluted	$	0.06	$	0.20	$	0.21	$	0.09	$	0.18	$	0.11	$	0.14		$	0.07

Liquidity and Capital Resources

We assess our liquidity based on our current expectations regarding sales, operating expenses, capital spending and debt service requirements. Based on this assessment, we believe that our cash flow from operating activities, together with existing cash and cash equivalents and availability under our revolving credit facilities, will be sufficient to fund our working capital, capital expenditure and debt service requirements for at least the next twelve months. Our liquidity is affected by, among other things, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels, other uses of our cash including the payments due in a recently settled patent license litigation, any purchases of stock under our stock repurchase program, any acquisitions or investments in joint ventures and our ability to either repay debt out of operating cash flow or refinance it at or prior to maturity with the proceeds of debt or equity offerings. There can be no assurance that we will generate the necessary net income or operating cash flows, or be able to borrow sufficient funds, to meet the funding needs of our business beyond the next twelve months due to a variety of factors, including the cyclical nature of the semiconductor industry and other factors discussed in Part I, Item 1A of this Annual Report on Form 10-K.

Our primary source of cash and the source of funds for our operations are cash flows from operations, current cash and cash equivalents, borrowings under available debt facilities and proceeds from any additional debt or equity financings. As of December 31, 2014, we had cash and cash equivalents of $449.9 million. Included in our cash balance as of December 31, 2014, is $269.6 million held offshore by our foreign subsidiaries. If we were to distribute this offshore cash to the U.S. as dividends from our foreign subsidiaries, we would incur up to $21.5 million of foreign withholding taxes; however, we would not incur a significant amount of U.S. federal income taxes, due to the availability of tax loss carryovers and foreign tax credits.

As of December 31, 2014, we had availability of $199.6 million under our $200.0 million first lien senior secured revolving credit facility. Our foreign subsidiaries had $60.0 million available to be drawn under secured revolving credit facilities for general corporate purposes, general working capital purposes and capital expenditures and $220.0 million available to be borrowed under secured term loan credit facilities for general working capital purposes, capital expenditures and repayment of inter-company debt.

As of December 31, 2014, we had $1,530.8 million of debt. Our scheduled principal repayments on debt include $5.0 million due in 2015, $70.0 million due in 2016, $110.0 million due in 2017, $345.0 million due in 2018, $70.0 million due in 2019 and $925.0 million due thereafter. In April 2014, holders of our 6.0% Convertible senior subordinated notes due April 2014 converted the remaining outstanding principal amount of $56.4 million into 18.6 million shares of our common stock, and we repaid $60.0 million of a foreign secured term loan credit facility maturing in July 2017. We were in compliance with all of our debt covenants at December 31, 2014, and we expect to remain in compliance with these covenants for at least the next twelve months.

In certain foreign locations, we use non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount

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to the face amount. Available capacity under these programs is dependent on the level of our trade accounts receivable eligible to be sold, the financial institutions' willingness to purchase such receivables and the limits provided by the financial institutions. For the year ended December 31, 2014 and 2013, we sold accounts receivable totaling $340.0 million and $130.2 million, respectively, for a discount, plus fees, of $1.5 million and $0.6 million, respectively. At December 31, 2014 and December 31, 2013, there were outstanding receivables of $102.7 million and $96.0 million, respectively, which had been sold to financial institutions under these arrangements.

In order to reduce our debt and future cash interest payments, we may from time to time repurchase our outstanding notes for cash or exchange shares of our common stock for our outstanding notes. Any such transaction may be made in the open market, through privately negotiated transactions or otherwise and is subject to the terms of our indentures and other debt agreements, market conditions and other factors.

Certain debt agreements have restrictions on dividend payments and the repurchase of stock and subordinated securities. These restrictions are determined in part by calculations based upon cumulative net income. We have never paid a dividend to our stockholders, and we do not have any present plans for doing so. Amkor Technology, Inc. also guarantees certain debt of our subsidiaries.

We sponsor an accrued severance plan for our subsidiary in Korea, which under existing tax laws in Korea, limits our ability to currently deduct related severance expenses accrued under that plan. The purpose of these limitations is to encourage companies to migrate to a defined contribution or defined benefit plan. If we retain our existing severance plan, the deduction for severance expenses will be limited to severance payments made to retired employees, which results in a larger current income tax liability in Korea. We are evaluating our alternatives, and if we decide to adopt a new plan, we may be required to fund a portion of the existing liability, which would provide a current tax deduction upon funding. Our Korean severance liability was $146.7 million as of December 31, 2014.

In January 2015, we settled our patent license litigation with Tessera. Under the terms of the settlement, Amkor agreed to pay Tessera a total of $155.0 million in 16 equal quarterly recurring payments commencing in the first quarter of 2015 and continuing through the fourth quarter of 2018. We expect to use cash on hand, proceeds from borrowings under our existing lines of credit or other sources to make these payments. We refer you to Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K for a discussion of the litigation relating to Amkor's license agreement with Tessera.

We operate in a capital intensive industry. Servicing our current and future customers may require that we incur significant operating expenses and make significant investments in equipment and facilities, which are generally made in advance of the related revenues and without firm customer commitments.

Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, exclusive of any fees, commissions or other expenses. At December 31, 2014, approximately $91.6 million was available to repurchase common stock pursuant to the stock repurchase program. The purchase of stock may be made in the open market or through privately negotiated transactions. The timing, manner, price and amount of any repurchases will be determined by us at our discretion and will depend upon a variety of factors including economic and market conditions, the cash needs and investment opportunities for the business, the current market price of our stock, applicable legal requirements and other factors. We have not purchased any stock under the plan since 2012.

Investments

We make significant capital expenditures in order to service the demand of our customers. In 2014, our capital expenditures totaled $681.1 million or approximately 21.8% of net sales, including $37.7 million for our new K5 facility. Our spending was primarily focused on investments in advanced packaging and test equipment supporting mobile communications.

In September 2014, we started the construction of our new K5 facility in Korea. We plan to spend approximately$375 millionfor the construction of the facility in 2015 and 2016, including capitalized interest of $40 million.

We expect that our 2015 capital expenditures will be approximately $600 million, approximately $150 million of which will be spent on the construction of our new K5 facility. Our expected capital expenditures will primarily support customer

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demand for packaging and test services related to mobile communications. Ultimately, the amount of our 2015 capital expenditures will depend on several factors including, among others, the timing and implementation of any capital projects under review, the performance of our business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity to service anticipated customer demand and the availability of cash flows from operations or financing.

In January 2015, we exercised our option to increase our ownership interest of J-Devices from 60% to 65.7% for an aggregate purchase price of ¥1.5 billion ($12.9 million). We expect to exercise our option to further increase our ownership in J-Devices to 80% in the fourth quarter of 2015, subject to market and other conditions at the time of exercise. If we exercise our 80% option, certain governance restrictions of our shareholders' agreement will lapse, and we will begin consolidating the financial results of J-Devices at that time. The exercise price for all options is payable in cash and is determined using a formula based upon the net book value and a multiple of earnings before interest, taxes, depreciation and amortization of J-Devices.

In addition, we are subject to risks associated with our capital expenditures, including those discussed in Part I, Item 1A of this Annual Report on Form 10-K under the caption "Capital Expenditures - We Make Substantial Investments in Equipment and Facilities To Support the Demand Of Our Customers, Which May Adversely Affect Our Business If the Demand Of Our Customers Does Not Develop As We Expect or Is Adversely Affected."

Cash Flows

Net cash provided by (used in) operating, investing and financing activities for each of the three years ended December 31, 2014 was as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Operating activities	$	613,909		$	557,536		$	389,063
Investing activities	(694,478		)	(640,494		)	(520,121		)
Financing activities	(79,995		)	280,145			110,032

Operating activities:  Our cash flow provided by operating activities for the year ended December 31, 2014, increased by $56.4 million compared to the year ended December 31, 2013. The increase is primarily attributable to net sales growth and improved profitability, partially offset by an increase in working capital. Our cash provided by operating activities for the year ended December 31, 2013, increased by $168.5 million compared to the year ended December 31, 2012. The increase is primarily attributable to higher net sales and improved profitability.

Investing activities:  Our cash flow used in investing activities is principally for payments for property, plant and equipment. The net cash used in investing activities for the year ended December 31, 2014, included cash transferred on the sale of our subsidiary to J-Devices, net of proceeds. The net cash used in investing activities for the year ended December 31, 2013, included payments for the land relating to K5, an investment in J-Devices and our power discrete business in Malaysia, offset by proceeds from the January 2013 sale of office space and land.

Financing activities:  The net cash used in financing activities for the year ended December 31, 2014 was driven by our repayment of borrowings at our subsidiary in Korea and the final payment for our acquired power discrete business in Malaysia. The net cash provided by financing activities during 2013 primarily resulted from the issuance of senior notes and borrowings at our subsidiary in Korea, offset by foreign debt payments.

We provide the following supplemental data to assist our investors and analysts in understanding our liquidity and capital resources. We define free cash flow as net cash provided by operating activities less payments for property, plant and equipment. Free cash flow is not defined by U.S. GAAP. We believe free cash flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses free cash flow in evaluating our liquidity, our ability to service debt and our ability to fund capital expenditures. However, free cash flow has certain limitations, including that it does not represent the residual

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cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of free cash flow may not be comparable to similarly titled measures reported by other companies. We had negative free cash flow of $67.2 million for the year ended December 31, 2014, primarily due to our investments to support customer demand for packaging and test services related to mobile communications.

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Net cash provided by operating activities	$	613,909		$	557,536		$	389,063
Payments for property, plant and equipment	(681,120		)	(566,256		)	(533,512		)
Free cash flow	$	(67,211	)	$	(8,720	)	$	(144,449	)

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Contractual Obligations

The following table summarizes our contractual obligations at December 31, 2014, and the effect such obligations are expected to have on our liquidity and cash flow in future periods.

			Payments Due for Year Ending December 31,
	Total		2015		2016		2017		2018		2019		Thereafter
	(In thousands)
Total debt	$	1,525,000	$	5,000	$	70,000	$	110,000	$	345,000	$	70,000	$	925,000
Scheduled interest payment obligations (1)	556,100		94,951		93,525		89,377		75,445		62,646		140,156
Purchase obligations (2)	307,222		247,345		46,784		2,406		4,849		1,017		4,821
Operating lease obligations	52,091		13,116		7,792		6,336		6,029		6,194		12,624
Severance obligations (3)	146,661		13,226		12,018		10,946		9,965		9,076		91,430
Settlement payments (4)	155,000		38,750		38,750		38,750		38,750		—		—
Total contractual obligations	$	2,742,074	$	412,388	$	268,869	$	257,815	$	480,038	$	148,933	$	1,174,031

(1) Scheduled interest payment obligations were calculated using stated coupon rates for fixed rate debt and interest rates applicable at December 31, 2014, for variable rate debt.

(2) Represents off-balance sheet purchase obligations for capital expenditures and long-term supply contracts outstanding at December 31, 2014, including $220 million for construction obligations for K5.

(3) Represents estimated benefit payments for our Korean subsidiary severance plan.

(4) Represents settlement payments for patent license litigation. See Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

In addition to the obligations identified in the table above, other non-current liabilities recorded in our Consolidated Balance Sheet at December 31, 2014, include:

• $19.2 million of net foreign pension plan obligations, for which the timing and actual amount of impact on our future cash flow is uncertain.

• $10.5 million net liability associated with unrecognized tax benefits. Due to the uncertainty regarding the amount and the timing of any future cash outflows associated with our unrecognized tax benefits, we are unable to reasonably estimate the amount and period of ultimate settlement, if any, with the various taxing authorities.

Off-Balance Sheet Arrangements

As of December 31, 2014, we had no off-balance sheet guarantees or other off-balance sheet arrangements as defined in Item 303(a)(4)(ii) of SEC Regulation S-K.

Other Contingencies

We refer you to Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K for a discussion of our contingencies related to litigation and other legal matters. If an unfavorable ruling were to occur in these matters, there exists the possibility of a material adverse impact on our business, liquidity, results of operations, financial position and cash flows in the period in which the ruling occurs. The potential impact from legal proceedings on our business, liquidity, results of operations, financial position and cash flows could change in the future.

Critical Accounting Policies and Use of Estimates

We have identified the policies below as critical to our business operations and the understanding of our results of operations. A summary of our significant accounting policies used in the preparation of our Consolidated Financial Statements appears in Note 1 to our Consolidated Financial Statements included in Part II, Item 8 of this Annual Report on Form 10-K. Our preparation of this Annual Report on Form 10-K requires us to make estimates and assumptions that affect the reported amount of assets and liabilities, disclosure of contingent assets and liabilities at the date of our financial statements and the

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reported amounts of revenue and expenses during the reporting period. There can be no assurance that actual results will not differ from those estimates.

We believe the following critical accounting policies, which have been reviewed with the Audit Committee of our board of directors, affect our more significant judgments and estimates used in the preparation of our Consolidated Financial Statements.

Revenue Recognition.  We recognize revenue from our packaging and test services, net of value-added or other similar taxes, when there is evidence of an arrangement, delivery has occurred or services have been rendered, fees are fixed or determinable and collectibility is reasonably assured. Generally these criteria are met and revenue is recognized upon shipment. If the revenue recognition criteria are not met, we defer the revenue. Deferred revenue generally results from two types of transactions: contractual invoicing at interim points in the packaging and test process prior to shipment of the finished product and customer advances for supply agreements with customers where we commit capacity in exchange for customer prepayment of services. These prepayments are deferred and recorded as customer advances within accrued expenses and other non-current liabilities.

We generally do not take ownership of customer-supplied semiconductor wafers. Title and risk of loss remains with the customer for these materials at all times. Accordingly, the cost of the customer-supplied materials is not included in our Consolidated Financial Statements.

An allowance for sales credits is recorded as a reduction to sales and accounts receivable during the period of sale such that accounts receivable is reported at its estimated net realizable value. The allowance for sales credits is an estimate of the future credits we will issue for billing adjustments primarily for invoicing corrections and miscellaneous customer claims and is estimated based upon recent credit issuance, historical experience and specific identification of known or expected sales credits at the end of the reporting period. Additionally, provisions are made for doubtful accounts when there is doubt as to the collectibility of accounts receivable. The allowance for doubtful accounts is recorded as bad debt expense and is classified as selling, general and administrative expense. The allowance for doubtful accounts is based upon specific identification of doubtful accounts considering the age of the receivable balance, the customer’s historical payment history and current credit worthiness as well as specific identification of any known or expected collectibility issues. Historically, our allowance for doubtful accounts has been immaterial.

Income Taxes.  We operate in and file income tax returns in various U.S. and non-U.S. jurisdictions which are subject to examination by tax authorities. The tax returns for open years in all jurisdictions in which we do business are subject to change upon examination. We believe that we have estimated and provided adequate accruals for potential additional taxes and related interest expense that may ultimately result from such examinations. We believe that any additional taxes or related interest over the amounts accrued will not have a material effect on our financial condition, results of operations or cash flows. However, resolution of these matters involves uncertainties and there can be no assurance that the outcomes will be favorable. In addition, changes in the mix of income from our foreign subsidiaries, expiration of tax holidays or changes in tax laws or regulations could result in increased effective tax rates in the future.

Additionally, we record valuation allowances for deferred tax assets for which it is more likely than not that the related tax benefits will not be realized. U.S. GAAP requires companies to weigh both positive and negative evidence in determining the need for a valuation allowance for deferred tax assets. As a result of net losses experienced in recent years in certain jurisdictions, we have determined that a valuation allowance is required for certain deferred tax assets including those related to all of our net operating loss carryforwards in the U.S. We will release such valuation allowances as the related deferred tax benefits are realized on our tax returns or when sufficient net positive evidence exists to conclude it is more likely than not that the deferred tax assets will be realized.

Valuation of Inventory.  We order raw materials based on customers’ forecasted demand. If our customers change their forecasted requirements and we are unable to cancel our raw materials order or if our vendors require that we order a minimum quantity that exceeds the current forecasted demand, we will experience a build-up in raw material inventory. We will either seek to recover the cost of the materials from our customers or utilize the inventory in production. However, we may not be successful in recovering the cost from our customers or be able to use the inventory in production and, accordingly, if we believe that it is probable that we will not be able to recover such costs, we reduce the carrying value of our inventory. Additionally, we reduce the carrying value of our inventories for the cost of inventory we estimate is excess

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and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Inventories are stated at the lower of cost or market (net realizable value). Cost is principally determined by standard cost (on a first-in, first-out basis for raw materials and purchased components and an average cost basis for work-in-process) or by the weighted moving average method (for commodities and spare parts), both of which approximate actual cost. We review and set our standards as needed, but at a minimum on an annual basis.

Long-lived Assets.  Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Land use rights	50 to 90 years
Buildings and improvements	10 to 25 years
Machinery and equipment	2 to 7 years
Software and computer equipment	3 to 5 years
Furniture, fixtures and other equipment	4 to 10 years

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

Legal Contingencies.  We may be subject to certain legal proceedings, lawsuits and other claims. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if there is at least a reasonable possibility that a loss has been incurred.

Our assessment of required reserves may change in the future due to new developments in each matter. The present legislative and litigation environment is substantially uncertain, and it is possible that our liquidity, results of operations, financial position and cash flows could be materially and adversely affected by an unfavorable outcome or settlement of pending litigation and other claims.

Recently Adopted and Recently Issued Standards

For information regarding recently adopted and recently issued accounting standards, see Note 2 to our Consolidated Financial Statements included in Part II, Item 8 of this Annual Report on Form 10-K.

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Item 7A. Quantitative and Qualitative Disclosures about Market Risk

Market Risk Sensitivity

We are exposed to market risks, primarily related to foreign currency and interest rate fluctuations. In the normal course of business, we employ established policies and procedures to manage the exposure to fluctuations in foreign currency values and changes in interest rates. Our use of derivative instruments, including forward exchange contracts, has been historically insignificant; however, we continue to evaluate the use of hedging instruments to manage currency and other risks.

Foreign Currency Risk

In order to reduce our exposure to foreign currency gains and losses, we generally use natural hedging techniques to reduce foreign currency rate risk. The U.S. dollar is our reporting currency and the functional currency for our subsidiaries, with the exception of our equity-method investee, J-Devices, where the local currency is the functional currency.

We have foreign currency exchange rate risk associated with the remeasurement of monetary assets and liabilities on our Consolidated Balance Sheets that are denominated in currencies other than the functional currency. We performed a sensitivity analysis of our foreign currency exposure as of December 31, 2014, to assess the potential impact of fluctuations in exchange rates for all foreign denominated assets and liabilities. Assuming a 10% adverse movement for all currencies against the U.S. dollar as of December 31, 2014, our income before taxes and equity in earnings of unconsolidated affiliate would have been approximately $18 million lower due to the remeasurement of monetary assets and liabilities.

In addition, we have foreign currency exchange rate exposure on our results of operations. For the year ended December 31, 2014, approximately 95% of our net sales were denominated in U.S. dollars. Our remaining net sales were principally denominated in Korean won for local country sales. For the year ended December 31, 2014, approximately 63% of our cost of sales and operating expenses were denominated in U.S. dollars and were largely for raw materials and depreciation. The remaining portion of our cost of sales and operating expenses was principally denominated in the Asian currencies where our production facilities are located and largely consisted of labor and utilities. To the extent that the U.S. dollar weakens against these Asian based currencies, similar foreign currency denominated transactions in the future will result in higher sales, higher cost of sales and operating expenses, with cost of sales and operating expenses having the greater impact on our financial results. Similarly, our sales, cost of sales and operating expenses will decrease if the U.S. dollar strengthens against these foreign currencies. We performed a sensitivity analysis of our foreign currency exposure as of December 31, 2014, to assess the potential impact of fluctuations in exchange rates for all foreign denominated sales and expenses. Assuming a 10% adverse movement from the year ended December 31, 2014, exchange rates of the U.S. dollar compared to all of these Asian-based currencies as of December 31, 2014, our operating income would have been approximately $100 million lower due to this exposure.

There are inherent limitations in the sensitivity analysis presented, primarily due to the assumption that foreign exchange rate movements across multiple jurisdictions are similar and would be linear and instantaneous. As a result, the analysis is unable to reflect the potential effects of more complex market or other changes that could arise which may positively or negatively affect our results of operations.

Our consolidated financial statements are impacted by changes in exchange rates at entities where the local currency is the functional currency. The effect of foreign exchange rate translation for these entities for the years ended December 31, 2014 and 2013, was a net foreign translation loss of $18.0 million and $17.0 million, respectively, and was recognized as an adjustment to equity through other comprehensive loss.

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Interest Rate Risk

We have interest rate risk with respect to our long-term debt. Our fixed rate debt consists of senior notes and our variable rate debt principally relates to foreign borrowings and revolving credit facilities. Changes in interest rates have different impacts on the fixed and variable rate portions of our debt portfolio. A change in interest rates on the fixed portion of the debt portfolio impacts the fair value of the debt instrument but has no impact on interest expense or cash flows. A change in interest rates on the variable portion of the debt portfolio impacts the interest incurred and cash flows but does not generally impact the fair value of the instrument.

The table below presents the interest rates, maturities and fair value of our fixed and variable rate debt as of December 31, 2014.

	2015			2016			2017			2018			2019			Thereafter			Total			Fair Value
Long term debt:
Fixed rate debt (In thousands)	$	—		$	—		$	—		$	345,000		$	—		$	925,000		$	1,270,000		$	1,268,619
Average interest rate	—		%	—		%	—		%	7.4		%	—		%	6.5		%	6.7		%
Variable rate debt (In thousands)	$	5,000		$	70,000		$	110,000		$	—		$	70,000		$	—		$	255,000		$	254,999
Average interest rate	3.3		%	4.0		%	3.6		%	—		%	3.9		%	—		%	3.8		%
Total debt (In thousands)	$	5,000		$	70,000		$	110,000		$	345,000		$	70,000		$	925,000		$	1,525,000		$	1,523,618

For information regarding the fair value of our long-term debt, see Note 17 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

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Item 8. Financial Statements and Supplementary Data

We present the information required by Item 8 of Form 10-K here in the following order:

	Page
Report of Independent Registered Public Accounting Firm	52
Consolidated Statements of Income — Years ended December 31, 2014, 2013 and 2012	53
Consolidated Statements of Comprehensive Income — Years ended December 31, 2014, 2013 and 2012	54
Consolidated Balance Sheets — December 31, 2014 and 2013	55
Consolidated Statements of Stockholders’ Equity — Years ended December 31, 2014, 2013 and 2012	56
Consolidated Statements of Cash Flows — Years ended December 31, 2014, 2013 and 2012	57
Notes to Consolidated Financial Statements	58
Schedule II — Valuation and Qualifying Accounts	87

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of Amkor Technology, Inc.:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Amkor Technology, Inc. and its subsidiaries at December 31, 2014 and 2013, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2014 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedule listed in the accompanying index presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2014, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedule, 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 these financial statements, on the financial statement schedule, and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. 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.

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

Phoenix, Arizona

February 19, 2015

52

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands, except per share data)
Net sales	$	3,129,440		$	2,956,450		$	2,759,546
Cost of sales	2,576,618			2,411,937			2,335,736
Gross profit	552,822			544,513			423,810
Selling, general and administrative	254,498			247,779			217,000
Research and development	76,864			64,625			54,118
Total operating expenses	331,362			312,404			271,118
Operating income	221,460			232,109			152,692
Interest expense	104,956			96,739			83,974
Interest expense, related party	4,969			9,169			13,969
Other (income) expense, net	(24,543		)	2,214			638
Total other expense, net	85,382			108,122			98,581
Income before taxes and equity in earnings of unconsolidated affiliate	136,078			123,987			54,111
Income tax expense	33,845			22,646			17,001
Income before equity in earnings of unconsolidated affiliate	102,233			101,341			37,110
Equity in earnings of J-Devices	31,654			10,316			5,592
Net income	133,887			111,657			42,702
Net income attributable to noncontrolling interests	(3,501		)	(2,361		)	(884		)
Net income attributable to Amkor	$	130,386		$	109,296		$	41,818
Net income attributable to Amkor per common share:
Basic	$	0.56		$	0.58		$	0.26
Diluted	$	0.55		$	0.50		$	0.24
Shares used in computing per common share amounts:
Basic	230,710			187,032			160,105
Diluted	236,731			235,330			243,004

The accompanying notes are an integral part of these statements.

53

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Net income	$	133,887		$	111,657		$	42,702
Other comprehensive (loss) income, net of tax:
Adjustments to unrealized components of defined benefit pension plans, net of tax	(1,512		)	4,360			5,137
Foreign currency translation adjustment	(11,964		)	(4,895		)	(2,688		)
Equity interest in J-Devices' other comprehensive loss, net of tax	(19,136		)	(10,961		)	(2,057		)
Total other comprehensive (loss) income	(32,612		)	(11,496		)	392
Comprehensive income	101,275			100,161			43,094
Comprehensive income attributable to noncontrolling interests	(3,501		)	(2,361		)	(884		)
Comprehensive income attributable to Amkor	$	97,774		$	97,800		$	42,210

The accompanying notes are an integral part of these statements.

54

AMKOR TECHNOLOGY, INC.

CONSOLIDATED BALANCE SHEETS

	December 31,
	2014			2013
	(In thousands, except per share data)
ASSETS
Current assets:
Cash and cash equivalents	$	449,946		$	610,442
Restricted cash	2,681			2,681
Accounts receivable, net of allowances of $1,377 and $7,120	469,683			385,542
Inventories	223,379			200,423
Other current assets	52,259			33,328
Total current assets	1,197,948			1,232,416
Property, plant and equipment, net	2,206,476			2,006,553
Investments	117,733			105,214
Restricted cash	2,123			2,234
Other assets	111,125			80,881
Total assets	$	3,635,405		$	3,427,298
LIABILITIES AND EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	5,000		$	61,350
Trade accounts payable	309,025			260,534
Capital expenditures payable	127,568			104,800
Accrued expenses	258,997			264,252
Total current liabilities	700,590			690,936
Long-term debt	1,450,824			1,516,390
Long-term debt, related party	75,000			75,000
Pension and severance obligations	152,673			165,073
Other non-current liabilities	125,382			14,959
Total liabilities	2,504,469			2,462,358
Commitments and contingencies (Note 18)
Amkor stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	—			—
Common stock, $0.001 par value, 500,000 shares authorized, 282,231 and 262,109 shares issued, and 236,627 and 216,702 shares outstanding, in 2014 and 2013, respectively	282			262
Additional paid-in capital	1,878,810			1,812,530
Accumulated deficit	(516,962		)	(647,348		)
Accumulated other comprehensive loss	(32,867		)	(255		)
Treasury stock, at cost, 45,604 and 45,407 shares in 2014 and 2013, respectively	(213,028		)	(211,449		)
Total Amkor stockholders’ equity	1,116,235			953,740
Noncontrolling interests in subsidiaries	14,701			11,200
Total equity	1,130,936			964,940
Total liabilities and equity	$	3,635,405		$	3,427,298

The accompanying notes are an integral part of these statements.

55

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

				Additional Paid- In Capital		Accumulated Deficit			Accumulated Other Comprehensive Income (Loss)								Total Amkor Stockholders' Equity			Noncontrolling Interest in Subsidiaries		Total Equity
	Common Stock											Treasury Stock
	Shares	Par Value										Shares		Cost
	(In thousands)
Balance at December 31, 2011	197,359	$	197	$	1,611,242	$	(798,462	)	$	10,849		(28,731	)	$	(130,560	)	$	693,266		$	7,955	$	701,221
Net income	—	—		—		41,818			—			—		—			41,818			884		42,702
Other comprehensive income	—	—		—		—			392			—		—			392			—		392
Repurchase of common stock	—	—		—		—			—			(16,472	)	(79,814		)	(79,814		)	—		(79,814		)
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(109	)	(609		)	(609		)	—		(609		)
Issuance of stock through share-based compensation plans	350	1		181		—			—			—		—			182			—		182
Share-based compensation expense	—	—		2,720		—			—			—		—			2,720			—		2,720
Balance at December 31, 2012	197,709	$	198	$	1,614,143	$	(756,644	)	$	11,241		(45,312	)	$	(210,983	)	$	657,955		$	8,839	$	666,794
Net income	—	—		—		109,296			—			—		—			109,296			2,361		111,657
Other comprehensive loss	—	—		—		—			(11,496		)	—		—			(11,496		)	—		(11,496		)
Conversion of debt to common stock	64,027	64		194,970		—			—			—		—			195,034			—		195,034
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(95	)	(466		)	(466		)	—		(466		)
Issuance of stock through share-based compensation plans	373	—		446		—			—			—		—			446			—		446
Share-based compensation expense	—	—		2,971		—			—			—		—			2,971			—		2,971
Balance at December 31, 2013	262,109	$	262	$	1,812,530	$	(647,348	)	$	(255	)	(45,407	)	$	(211,449	)	$	953,740		$	11,200	$	964,940
Net income	—	—		—		130,386			—			—		—			130,386			3,501		133,887
Other comprehensive loss	—	—		—		—			(32,612		)	—		—			(32,612		)	—		(32,612		)
Conversion of debt to common stock	18,632	19		56,331		—			—			—		—			56,350			—		56,350
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(197	)	(1,579		)	(1,579		)	—		(1,579		)
Issuance of stock through share-based compensation plans	1,490	1		6,249		—			—			—		—			6,250			—		6,250
Share-based compensation expense	—	—		3,700		—			—			—		—			3,700			—		3,700
Balance at December 31, 2014	282,231	$	282	$	1,878,810	$	(516,962	)	$	(32,867	)	(45,604	)	$	(213,028	)	$	1,116,235		$	14,701	$	1,130,936

The accompanying notes are an integral part of these statements.

56

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Cash flows from operating activities:
Net income	$	133,887		$	111,657		$	42,702
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	464,706			410,346			370,479
Amortization of deferred debt issuance costs and premiums	2,237			2,880			3,663
Deferred income taxes	(17,190		)	(8,256		)	6,078
Equity in earnings of unconsolidated affiliate	(31,654		)	(10,316		)	(5,592		)
Loss on debt retirement	—			11,619			737
(Gain) loss on disposal of fixed assets, net	1,276			(2,545		)	(1,676		)
Share-based compensation	3,700			2,971			2,720
Gain on sale of subsidiary to J-Devices	(9,155		)	—			—
Other, net	869			(712		)	(1,279		)
Changes in assets and liabilities:
Accounts receivable	(80,775		)	(531		)	(97,677		)
Inventories	(27,817		)	38,248			(29,882		)
Other current assets	(8,747		)	10,873			(5,015		)
Other assets	954			(3,709		)	(598		)
Trade accounts payable	55,693			(67,198		)	17,142
Accrued expenses	16,720			32,001			66,566
Other non-current liabilities	109,205			30,208			20,695
Net cash provided by operating activities	613,909			557,536			389,063
Cash flows from investing activities:
Payments for property, plant and equipment	(681,120		)	(566,256		)	(533,512		)
Proceeds from sale of property, plant and equipment	2,815			27,209			2,727
Acquisition of business, net of cash acquired	—			(41,865		)	—
Cash transferred on sale of subsidiary to J-Devices, net of proceeds	(15,774		)	—			—
Payments from J-Devices	—			8,843			15,484
Investment in J-Devices	—			(67,372		)	—
Purchase of short-term investment	(20,000		)	—			—
Proceeds from short-term investment	20,000			—			—
Other investing activities	(399		)	(1,053		)	(4,820		)
Net cash used in investing activities	(694,478		)	(640,494		)	(520,121		)
Cash flows from financing activities:
Borrowings under revolving credit facilities	—			5,000			—
Payments under revolving credit facilities	—			(5,000		)	—
Borrowings under short-term debt	—			—			30,000
Payments of short-term debt	—			—			(50,000		)
Proceeds from issuance of long-term debt	80,000			375,000			637,528
Payments of long-term debt	(145,000		)	(80,000		)	(420,116		)
Payments for debt issuance costs	(903		)	(3,216		)	(6,007		)
Payments for retirement of debt	—			(11,619		)	—
Payment of deferred consideration for an acquisition	(18,763		)	—			—
Payments for repurchase of common stock	—			—			(80,946		)
Proceeds from issuance of stock through share-based compensation plans	6,250			446			182
Payments of tax withholding for restricted shares	(1,579		)	(466		)	(609		)
Net cash (used in) provided by financing activities	(79,995		)	280,145			110,032
Effect of exchange rate fluctuations on cash and cash equivalents	68			207			(557		)
Net (decrease) increase in cash and cash equivalents	(160,496		)	197,394			(21,583		)
Cash and cash equivalents, beginning of period	610,442			413,048			434,631
Cash and cash equivalents, end of period	$	449,946		$	610,442		$	413,048
Supplemental disclosures of cash flow information:
Cash paid during the period for:
Interest	$	100,650		$	100,577		$	86,138
Income taxes	37,315			18,318			8,199
Non-cash investing and financing activities:
Additions to property, plant and equipment included in capital expenditures payable	127,568			104,800			122,969
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013	56,350			193,650			—

The accompanying notes are an integral part of these statements.

57

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements

1. Description of Business and Summary of Significant Accounting Policies

Description of Business

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Amkor pioneered the outsourcing of semiconductor packaging and test services through a predecessor corporation in 1968, and over the years we have built a leading position by:

• Designing and developing innovative packaging and test technologies;

• Offering a broad portfolio of cost-effective solutions and services;

• Successfully penetrating strategic end markets which offer solid growth prospects;

• Cultivating long-standing relationships with our customers, which include many of the world’s leading semiconductor companies;

• Collaborating with customers, original equipment manufacturers ("OEMs") and equipment and material suppliers;

• Developing a competitive cost structure with disciplined capital investment;

• Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution and

• Having a diversified operational scope with research and development, engineering and production capabilities at various facilities throughout China, Japan, Korea, Malaysia, the Philippines and Taiwan.

Basis of Presentation

Our Consolidated Financial Statements include the accounts of Amkor Technology, Inc. and our subsidiaries (“Amkor”). Our Consolidated Financial Statements reflect the elimination of all significant inter-company accounts and transactions. On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. The financial results of the entity have been included in our Consolidated Financial Statements from the date of acquisition (Note 3). On June 30, 2014, we completed the sale of our Japanese subsidiary to J-Devices, our equity-method joint venture in Japan. The financial results of the divested entity were included in our consolidated financial statements up to the date of sale (Note 4) and have subsequently been included in the results of J-Devices. Our investments in variable interest entities in which we are the primary beneficiary are consolidated. We reflect the remaining portion of variable interest entities and foreign subsidiaries that are not wholly owned as noncontrolling interests.

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, income taxes, inventory, long lived assets and contingencies. These estimates are based on management’s best knowledge of current events, historical experience, actions that we may undertake in the future and on various other assumptions that are believed to be reasonable under the circumstances. As a result, actual results could differ materially from these estimates and assumptions.

Consolidation of Variable Interest Entities

We have variable interests in certain Philippine realty corporations in which we have a 40% ownership and from whom we lease land and buildings in the Philippines, for which we are the primary beneficiary. As of December 31, 2014, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.8 million and $0.2 million, respectively. The impact of consolidating these variable interest entities on our Consolidated Statements of Income was not significant, and other than our lease payments, we have not provided

58

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

any significant assistance or other financial support to these variable interest entities for the years ended December 31, 2014, 2013 or 2012. The creditors of the Philippine realty corporations have no recourse to our general credit.

Foreign Currency Translation

The U.S. dollar is the functional currency of our subsidiaries and the foreign currency asset and liability amounts at these subsidiaries are remeasured into U.S. dollars at end-of-period exchange rates, except for nonmonetary items which are remeasured at historical rates. Foreign currency income and expenses are remeasured at daily exchange rates, except for expenses related to balance sheet amounts which are remeasured at historical exchange rates. Exchange gains and losses arising from remeasurement of foreign currency-denominated monetary assets and liabilities are included in other expense (income) in the period in which they occur.

The local currency is the functional currency of our equity-method investee, J-Devices. The asset and liability amounts of J-Devices are translated into U.S. dollars at end-of-period exchange rates. Income and expenses are translated into U.S. dollars at average exchange rates in effect during the period. The resulting translation adjustments are reported as a component of accumulated other comprehensive income in the stockholders’ equity section of the balance sheet. Assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency prior to translation into U.S. dollars, and the resulting transaction exchange gains or losses are included in other expense (income) in the period in which they occur.

Risks and Concentrations

The semiconductor industry is characterized by rapid technological change, competitive pricing pressures and cyclical market patterns. Our financial results are affected by a wide variety of factors, including general economic conditions worldwide, economic conditions specific to the semiconductor industry, the timely implementation of new package and test technologies, the ability to safeguard patents and intellectual property in a rapidly evolving market and reliance on materials and equipment suppliers. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns at various times. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

A significant portion of our revenues is concentrated with a small group of customers (refer to Note 19). The loss of a significant customer, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

Financial instruments, for which we are subject to credit risk, consist principally of accounts receivable and cash and cash equivalents. With respect to accounts receivable, we mitigate our credit risk by selling primarily to well established companies, performing ongoing credit evaluations and making frequent contact with customers. In addition, we may utilize non-recourse factoring to mitigate credit risk when considered appropriate. We have historically mitigated our credit risk with respect to cash and cash equivalents through diversification of our holdings into various high quality money market funds and bank deposit accounts. At December 31, 2014, our cash and cash equivalents were invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Contingencies and Litigation

We may be subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 18. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose

59

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

loss contingencies if there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Cash and Cash Equivalents

We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents consist of amounts invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Restricted Cash

Restricted cash, current, consists of short-term cash equivalents used to collateralize our daily banking services. Restricted cash, non-current, mainly consists of collateral to fulfill foreign trade compliance requirements.

Inventories

Inventories are stated at the lower of cost or market (net realizable value). Cost is principally determined by standard cost (on a first-in, first-out basis for raw materials and purchased components and an average cost basis for work-in-process) or by the weighted moving average method (for commodities and spare parts), both of which approximate actual cost. We review and set our standards as needed, but at a minimum on an annual basis. We reduce the carrying value of our inventories for the cost of inventory we estimate is excess and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Other Current Assets

Other current assets consist principally of prepaid assets, deferred tax assets and an investment in government securities by a foreign subsidiary to satisfy local regulatory requirements, which is recorded at amortized cost.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Land use rights	50 to 90 years
Buildings and improvements	10 to 25 years
Machinery and equipment	2 to 7 years
Software and computer equipment	3 to 5 years
Furniture, fixtures and other equipment	4 to 10 years

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts, and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Investments

Our investment in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan, is accounted for as an equity method investment. We evaluate our investment for other-than-temporary impairment whenever events or changes in circumstances indicate that the fair value of the investment may be less than its carrying value. See Note 12 for additional information.

Other Assets

Other assets consist principally of deferred tax assets, deferred debt issuance costs and refundable security deposits.

Other Non-current Liabilities

Other non-current liabilities consist primarily of liabilities associated with the settlement of patent license litigation and uncertain income tax positions. See Note 18 for additional information on the settlement.

Treasury Stock

Treasury stock is recognized when outstanding shares are repurchased or otherwise acquired by us, including when outstanding shares are withheld to satisfy tax withholding obligations in connection with certain restricted share awards under our equity incentive plans. The repurchased and withheld shares are accounted for as treasury stock at cost.

Fair Value Measurements

We apply fair value accounting for assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring or nonrecurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. See Note 17 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services, net of value-added or other similar taxes, when there is evidence of an arrangement, delivery has occurred or services have been rendered, fees are fixed or determinable and collectibility is reasonably assured. Generally these criteria are met and revenue is recognized upon shipment. If the revenue recognition criteria are not met, we defer the revenue. Deferred revenue generally results from two types of transactions: contractual invoicing at interim points in the packaging and test process prior to shipment of the finished product and customer advances for supply agreements with customers where we commit capacity in exchange for customer prepayment of services. These prepayments are deferred and recorded as customer advances within accrued expenses and other non-current liabilities.

We generally do not take ownership of customer-supplied semiconductor wafers. Title and risk of loss remains with the customer for these materials at all times. Accordingly, the cost of the customer-supplied materials is not included in our Consolidated Financial Statements.

An allowance for sales credits is recorded as a reduction to sales and accounts receivable during the period of sale such that accounts receivable is reported at its estimated net realizable value. The allowance for sales credits is an estimate of the future credits we will issue for billing adjustments primarily for invoicing corrections and miscellaneous customer claims and is estimated based upon recent credit issuance, historical experience and specific identification of known or expected sales credits at the end of the reporting period. Additionally, provisions are made for doubtful accounts when there is doubt as to the collectibility of accounts receivable. The allowance for doubtful accounts is recorded as bad debt expense and is classified as selling, general and administrative expense. The allowance for doubtful accounts is based upon specific identification of doubtful accounts considering the age of the receivable balance, the customer’s historical payment history and current credit worthiness as well as specific identification of any known or expected collectibility issues. Historically, our allowance for doubtful accounts has been immaterial.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Shipping and Handling Fees and Costs

Amounts billed to customers for shipping and handling are presented in net sales. Costs incurred for shipping and handling are included in cost of sales.

Research and Development Costs

Research and development expenses include costs attributable to the conduct of research and development programs primarily related to the development of new package designs or technologies and improving the efficiency and capabilities of our existing production processes. Such costs include salaries, payroll taxes, employee benefit costs, materials, supplies, depreciation and maintenance of research equipment, services provided by outside contractors and the allocable portions of facility costs such as rent, utilities, insurance, repairs and maintenance, depreciation and general support services. All costs associated with research and development are expensed as incurred.

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis as well as for net operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related tax benefits will not be realized.

In determining the amount of the valuation allowance, we consider all available evidence of realization, as well as feasible tax planning strategies, in each taxing jurisdiction. If all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if we conclude that we will ultimately be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a credit to income tax expense. We monitor on an ongoing basis our ability to utilize our deferred tax assets and the continuing need for a related valuation allowance.

We recognize in our Consolidated Financial Statements the impact of an income tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Related interest and penalties are classified as income taxes in the financial statements. See Note 7 for more information regarding unrecognized income tax benefits.

2. New Accounting Standards

Recently Adopted Standards

In March 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-05, Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (Topic 830). ASU 2013-05 provides guidance to resolve the diversity in practice regarding the release into net income of the cumulative translation adjustment when a company sells or ceases to hold a controlling interest in a subsidiary or group of assets within a foreign entity. This ASU is effective for reporting periods beginning after December 15, 2013. ASU 2013-05 was adopted on January 1, 2014. On June 30, 2014, we sold our controlling interest in a foreign subsidiary. The sale resulted in a gain upon release of the cumulative translation adjustment associated with the entity (Note 4).

Recently Issued Standards

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of promised goods or services to customers in an amount

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and changes in judgments. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and permits the use of either full retrospective or modified retrospective methods of adoption. Early adoption is not permitted. We are currently evaluating the method of adoption and the impact that this guidance will have on our financial statements and disclosure.

3. Business Acquisitions

On July 31, 2013, we completed the purchase of 100% of the shares of Toshiba Electronics Malaysia Sdn. Bhd., Toshiba’s power discrete semiconductor packaging and test operation in Malaysia, and subsequently changed the name of the entity to Amkor Technology Malaysia Sdn. Bhd. The total price for the shares was $61.2 million, based on the net asset value at closing. We paid $42.4 million in cash at closing and paid the remaining $18.8 million in March 2014. We were also granted a non-exclusive, royalty bearing license by Toshiba to certain intellectual property rights for providing packaging and test services for power discrete and certain other semiconductor products. The license has a royalty cap of ¥1.5 billion (approximately $13 million). Under the purchase method of accounting, we allocated the purchase price to the assets acquired and liabilities assumed based on their estimated fair values on the date of acquisition. We did not record any goodwill as a result of the acquisition.

4. Sale of Subsidiary to J-Devices

On June 30, 2014, we sold 100% of the shares of our wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan to J-Devices, our equity-method joint venture in Japan, for ¥1.1 billion ($9.6 million). For additional information regarding our investment in J-Devices, we refer you to Note 12. We received ¥0.1 billion ($1.0 million) in cash from J-Devices at closing and will receive the remaining ¥1.0 billion ($8.6 million) by June 30, 2015. We recognized a net gain on the sale of $9.2 million in our consolidated financial statements in other (income) expense, net, which includes a gain of $12.6 million from the release of accumulated foreign currency translation adjustments associated with the entity (Note 16). J-Devices recognized a gain of $14.7 million on the transaction in its consolidated financial statements as the fair value of the net assets acquired exceeded the purchase price. The gain recognized by J-Devices increased our equity in earnings of J-Devices by $8.8 million. The combined net gain we recognized was $18.0 million.

5. Share-Based Compensation Plans

Our share-based compensation is measured at fair value and expensed over the service period (generally the vesting period). The amount of compensation expense to be recognized is adjusted for an estimated forfeiture rate which is based on historical data. For the years ended December 31, 2014, 2013 and 2012, we recognized share-based compensation attributable to stock options and restricted shares of $3.7 million, $3.0 million and $2.7 million, respectively, primarily in selling, general and administrative expenses. There were no corresponding deferred income tax benefits for stock options or restricted shares.

Equity Incentive Plan

Amended and Restated 2007 Equity Incentive Plan.  The Amended and Restated 2007 Equity Incentive Plan, (the “2007 Plan”) provides for the grant of the following types of incentive awards: (i) stock options, (ii) restricted stock, (iii) restricted stock units, (iv) stock appreciation rights, (v) performance units and performance shares and (vi) other stock or cash awards. Those eligible for awards include employees, directors and consultants who provide services to Amkor and its subsidiaries. The 2007 Plan has a contractual life of ten years and can be terminated at the discretion of the Board of Directors. There were originally 17.0 million shares of our common stock reserved for issuance under the 2007 Plan and at December 31, 2014 there were 11.4 million shares available for grant.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Stock options

Stock options are generally granted with an exercise price equal to the market price of the stock at the date of grant. Substantially all of the options granted are exercisable pursuant to a two to five year vesting schedule and the term of the options granted is no longer than ten years. Upon option exercise, we may issue new shares of common or treasury stock.

In order to calculate the fair value of stock options at the date of grant, we use the Black-Scholes option pricing model. Expected volatilities are based on historical performance of our stock. We also use historical data to estimate the timing and amount of option exercises and forfeitures within the valuation model. The expected term of the options is based on evaluations of historical and expected future employee exercise behavior and represents the period of time that options granted are expected to be outstanding. The risk-free interest rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.

The following table summarizes our stock option activity for the year ended December 31, 2014:

	Number of Shares (In thousands)	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2013	4,873	$	6.52
Granted	330	8.15
Exercised	(1,011)	6.18
Forfeited or expired	(370)	11.71
Outstanding at December 31, 2014	3,822	$	6.25	6.61	$	6,376
Fully vested at December 31, 2014 and expected to vest thereafter	3,798	$	6.26	6.59	$	6,325
Exercisable at December 31, 2014	2,113	$	7.17	4.93	$	2,454

The following assumptions were used to calculate the weighted average fair values of the options granted:

	For the Year Ended December 31,
	2014			2013			2012
Expected life (in years)	6.1			6.2			6.0
Risk-free interest rate	2.0		%	1.7		%	1.0		%
Volatility	57		%	60		%	65		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	4.46		$	2.49		$	2.68

Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $4.3 million as of December 31, 2014, which is expected to be recognized over a weighted-average period of approximately 2.5 years beginning January 1, 2015.

Restricted Shares

We grant restricted shares to employees under the 2007 Plan. The restricted shares vest ratably over four years, with 25% of the shares vesting at the end of the first year and the remainder vesting monthly or quarterly thereafter, depending on the grant, such that 100% of the shares will become vested on the fourth anniversary of the award, subject to the recipient’s continued employment with us on the applicable vesting dates. In addition, provided that the restricted shares have not been forfeited earlier, for certain grants, the restricted shares will vest upon the recipient’s death, disability or retirement, or upon a change in control of Amkor or, in some cases, upon retirement. Although ownership of the restricted shares does not transfer to the recipients until the shares have vested, recipients have voting and dividend rights on these shares from

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

the date of grant. The value of the restricted shares is determined based on the fair market value of the underlying shares on the date of the grant and is recognized ratably over the vesting period or to the date on which the recipient becomes retirement eligible, if shorter. Upon vesting of restricted stock awards, we may issue new shares of common or treasury stock.

The following table summarizes our restricted share activity for the year ended December 31, 2014:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2013	1,172		$	4.83
Awards granted	—		—
Awards vested	(479	)	5.18
Awards forfeited	(33	)	4.68
Nonvested at December 31, 2014	660		$	4.58

Total unrecognized compensation cost, net of a forfeiture estimate, was $2.6 million as of December 31, 2014, which is expected to be recognized over a weighted average period of approximately 2.1 years beginning January 1, 2015.

6. Other Income and Expense

Other income and expense consists of the following:

	December 31,
	2014			2013			2012
	(In thousands)
Interest income	$	(3,359	)	$	(3,785	)	$	(3,160	)
Foreign currency (gain) loss, net	(9,808		)	(5,626		)	4,185
Loss on debt retirement	757			12,330			1,199
Gain on sale of subsidiary to J-Devices (Note 4)	(9,155		)	—			—
Other income, net	(2,978		)	(705		)	(1,586		)
Total other (income) expense, net	$	(24,543	)	$	2,214		$	638

7. Income Taxes

Geographic sources of income (loss) before income taxes are as follows:

	For the Year Ended December 31,
	2014		2013			2012
	(In thousands)
United States	$	16,571	$	(36,829	)	$	17,062
Foreign	119,507		160,816			37,049
Total income before income taxes	$	136,078	$	123,987		$	54,111

The provision for income taxes includes current federal, state and foreign taxes payable and those deferred because of temporary differences between the financial statement and the tax bases of assets and liabilities.

65

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The components of the provision (benefit) for income taxes are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	(46		)	—			(75		)
Foreign	51,081			30,902			10,998
	51,035			30,902			10,923
Deferred
Federal	—			(8,556		)	1,859
State	—			9			266
Foreign	(17,190		)	291			3,953
	(17,190		)	(8,256		)	6,078
Total provision	$	33,845		$	22,646		$	17,001
Effective Tax Rate	24.9		%	18.3		%	31.4		%

The reconciliation between the U.S. federal statutory income tax rate of 35% and our income tax provision is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
U.S. federal tax at 35%	$	47,627		$	43,396		$	18,939
State taxes, net of federal benefit	1,940			1,124			1,126
Foreign income taxed at different rates	6,579			(17,814		)	(14,717		)
Foreign exchange (loss) gain	(17,321		)	844			12,329
Change in valuation allowance	(13,527		)	(32,415		)	(3,112		)
Adjustments related to prior years	3,643			2,727			(2,464		)
Income tax credits generated	(2,557		)	(2,622		)	(1,370		)
Repatriation of foreign earnings and profits	3,958			6,499			3,240
Expiration of capital loss carryforward	—			15,555			—
Expiration of net operating losses	2,534			—			—
Equity in earnings of J-Devices	—			—			2,404
Debt conversion costs	—			4,067			—
Other	969			1,285			626
Total	$	33,845		$	22,646		$	17,001

During 2013, we incurred costs which are not deductible for income tax purposes including certain costs in connection with the exchange of the 2014 Notes for shares of our common stock. The 2014 change in foreign income taxed at different rates is due to a change in the geographic income mix which resulted in a lower tax benefit in the current year.

Income tax expense in 2012 includes deferred taxes on undistributed earnings from our investment in J-Devices. In 2013 and 2014, deferred taxes were not required as a result of a change in our ownership structure of our investment in J-Devices.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following is a summary of the components of our deferred tax assets and liabilities:

	December 31,
	2014			2013
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	120,639		$	147,905
Income tax credits	24,754			27,751
Property, plant and equipment	19,796			14,390
Accrued liabilities	76,682			57,374
Unrealized foreign exchange loss	4,947			3,893
Other	12,963			15,137
Total deferred tax assets	259,781			266,450
Valuation allowance	(149,847		)	(179,183		)
Total deferred tax assets net of valuation allowance	109,934			87,267
Deferred tax liabilities:
Property, plant and equipment	27,921			21,716
Deferred gain	5,036			6,295
Other	2,844			1,967
Total deferred tax liabilities	35,801			29,978
Net deferred tax assets	$	74,133		$	57,289
Recognized as:
Other current assets	$	21,864		$	10,729
Other assets	54,950			47,609
Accrued expenses	(1,092		)	(97		)
Other non-current liabilities	(1,589		)	(952		)
Total	$	74,133		$	57,289

In 2014, the valuation allowance on our deferred tax assets decreased by $29.3 million primarily as a result of the utilization of domestic net operating loss carryforwards and the reduction of valuation allowance as the result of the sale of a subsidiary.

In 2013, the valuation allowance on our deferred tax assets decreased by $30.6 million primarily as a result of the utilization of domestic net operating loss carryforwards and expiring capital losses. Also during 2013, we concluded that sufficient net positive evidence existed to release the valuation allowance against the deferred tax assets at one of our foreign jurisdictions. The recent trend of improving taxable operating results in this jurisdiction continued in 2013, and we believe this recent history of earnings is sustainable and sufficient to fully realize the deferred tax assets in this jurisdiction.

In 2012, the valuation allowance on our deferred tax assets decreased by $4.5 million primarily as a result of the utilization of domestic net operating loss carryforwards partially offset by an increase associated with losses and reserves in certain foreign jurisdictions.

As a result of certain income tax accounting realization requirements with respect to accounting for share-based compensation, the table of deferred tax assets and liabilities shown above does not include certain deferred tax assets at December 31, 2014 and 2013 that arose directly from tax deductions related to equity compensation that is greater than the compensation recognized for financial reporting. If such deferred tax assets are subsequently realized, they will be recorded to contributed capital in the amount of $6.9 million. As a result of net operating loss carryforwards, we were not able to

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

recognize the excess tax benefits of stock option deductions in 2014 because the deductions did not reduce income tax payable.

As a result of certain capital investments, export commitments and employment levels, income from operations in China, Korea, Malaysia, the Philippines and Taiwan was subject to reduced income tax rates and in some cases is exempt from income taxes. The reduced tax rates or tax exemptions expire at various dates through 2022. We recognized $0.9 million, $4.8 million and $13.7 million in tax benefits as a result of the tax holidays in 2014, 2013 and 2012, respectively. The benefit of the tax holidays on diluted earnings per share was approximately $0.00, $0.02 and $0.06 for 2014, 2013 and 2012, respectively.

Our net operating loss carryforwards (“NOL’s”) are as follows:

	For the Year Ended December 31,
	2014		2013		Expiration
	(In thousands)
U.S. Federal NOL’s	$	317,841	$	342,770	2021-2033
U.S. State NOL’s	173,756		197,618		2015-2031
Foreign NOL’s	4,962		38,337		2015-2024

The deferred tax assets associated with certain of our foreign net operating losses have been reserved with a valuation allowance. The deferred tax assets associated with our U.S. federal and state net operating losses available for carryforward have been fully reserved with valuation allowances at December 31, 2014 and 2013. Also, our ability to utilize our U.S. net operating loss carryforwards may be limited in the future if we experience an ownership change as defined by the Internal Revenue Code.

At December 31, 2014, we have various tax credits available to be carried forward including U.S. foreign income tax credits totaling $8.1 million, expiring in 2016 and income tax credits totaling $11.1 million expiring in varying amounts through 2019 at our subsidiary in Korea. The deferred tax assets associated with the U.S. foreign income tax credits and certain foreign income tax credits have been fully reserved with a valuation allowance. Income tax credits generated by certain of our foreign subsidiaries in 2014, 2013 and 2012 have been recognized in our income tax provision.

Income taxes have not been provided on approximately $721.7 million of the undistributed earnings of our foreign subsidiaries at December 31, 2014, over which we have sufficient influence to control the distribution of such earnings and have determined that substantially all such earnings have been reinvested indefinitely. These earnings could become subject to either or both federal income tax and foreign withholding tax if they are remitted as dividends, if foreign earnings are loaned to any of our domestic companies, or if we sell our investment in certain subsidiaries. We estimate that repatriation of these foreign earnings would generate additional foreign withholding taxes of approximately $21.5 million and insignificant U.S. federal income tax after foreign tax credits.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

We operate in and file income tax returns in various U.S. and foreign jurisdictions which are subject to examination by tax authorities. The conclusion of examination of our 2008-2012 Korean income tax returns during 2014 did not result in any significant additional impact to income tax expense. Current examinations include our 2010, 2012 and 2013 Philippines income tax returns. We have tax returns that are open to examination in various jurisdictions for tax years 2009-2014. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits.

A reconciliation of the beginning and ending gross amount of unrecognized tax benefits is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at January 1	$	27,128		$	8,218		$	7,930
Additions based on tax positions related to the current year	6,032			17,752			5,551
Additions for tax positions of prior years	1,240			2,723			54
Reductions for tax positions of prior years	(15,433		)	(108		)	(4,091		)
Reductions related to settlements with tax authorities	(6,297		)	(1,353		)	(1,226		)
Reductions from lapse of statutes of limitations	—			(104		)	—
Balance at December 31	$	12,670		$	27,128		$	8,218

The net decrease in our unrecognized tax benefits was $14.5 million from December 31, 2013 to December 31, 2014. Our unrecognized tax benefits decreased primarily because of a $15.4 million reduction related to the application of a tax law change and a $5.1 million reduction related to the settlement of a tax examination in a foreign jurisdiction. These decreases were offset by $6.0 million of additions related to income attribution and other unrecognized tax benefits. At December 31, 2014, all of our gross unrecognized tax benefits would reduce our effective tax rate, if recognized.

The liability related to our unrecognized tax benefits is $10.5 million as of December 31, 2014, and is reported as a component of other non-current liabilities. The unrecognized tax benefits presented in the table above include positions that have reduced deferred tax assets, which are not included in the liability reported as a component of other non-current liabilities.

It is reasonably possible that the total amount of unrecognized tax benefits related to revenue attribution will decrease by up to $0.6 million due to the lapse of statues of limitations in foreign jurisdictions.

Our unrecognized tax benefits are subject to change as examinations of specific tax years are completed in the respective jurisdictions. Tax return examinations involve uncertainties and there can be no assurance that the outcome of examinations will be favorable.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

8. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding includes restricted shares held by retirement eligible recipients and is reduced for treasury stock. We grant restricted shares which entitle recipients to voting and nonforfeitable dividend rights from the date of grant therefore our unvested share-based compensation awards are considered participating securities and are included in the computation of EPS pursuant to the two-class method.

Diluted EPS is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, unvested restricted shares and convertible debt. The following table summarizes the computation of basic and diluted EPS:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands, except per share data)
Net income attributable to Amkor	$	130,386		$	109,296		$	41,818
Income allocated to participating securities	(372		)	(681		)	(212		)
Net income available to Amkor common stockholders — basic	130,014			108,615			41,606
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	6			93			212
Interest on 6.0% convertible notes due 2014, net of tax	1,039			9,440			16,103
Net income attributable to Amkor — diluted	$	131,059		$	118,148		$	57,921
Weighted average shares outstanding — basic	230,710			187,032			160,105
Effect of dilutive securities:
Stock options and restricted share awards	712			21			241
6.0% convertible notes due 2014	5,309			48,277			82,658
Weighted average shares outstanding — diluted	236,731			235,330			243,004
Net income attributable to Amkor per common share:
Basic	$	0.56		$	0.58		$	0.26
Diluted	0.55			0.50			0.24

The following table summarizes the potential shares of common stock that were excluded from diluted EPS, because the effect of including these potential shares was antidilutive:

	For the Year Ended December 31,
	2014	2013	2012
	(In thousands)
Stock options and restricted share awards	1,303	4,890	4,416

9. Factoring of Accounts Receivable

In certain foreign locations, we use non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the year ended December 31, 2014 and 2013, we sold accounts receivable totaling $340.0 million and $130.2 million, respectively, for a discount, plus fees, of $1.5 million and $0.6 million, respectively.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

10. Inventories

Inventories consist of the following:

	December 31,
	2014		2013
	(In thousands)
Raw materials and purchased components	$	161,942	$	147,292
Work-in-process	61,437		53,131
Total inventories	$	223,379	$	200,423

11. Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2014			2013
	(In thousands)
Land	$	207,985		$	208,048
Land use rights	26,845			26,845
Buildings and improvements	940,846			911,258
Machinery and equipment	3,953,891			3,577,045
Software and computer equipment	185,243			193,641
Furniture, fixtures and other equipment	15,347			17,430
Construction in progress	39,261			27,039
Total property, plant and equipment	5,369,418			4,961,306
Less accumulated depreciation and amortization	(3,162,942		)	(2,954,753		)
Total property, plant and equipment, net	$	2,206,476		$	2,006,553

Depreciation expense was $463.5 million, $406.7 million and $366.6 million for 2014, 2013 and 2012, respectively.

In 2013, we purchased land and have commenced construction activities for K5. We have recorded capitalized interest related to these activities of $8.6 million and $1.7 million as of December 31, 2014 and 2013, respectively.

12. Investments

Investments consist of the following:

	December 31,
	2014				2013
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	117,733	60.0	%	$	105,214	60.0	%

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

J-Devices Corporation

In October 2009, Amkor and Toshiba invested in Nakaya Microdevices Corporation (“NMD”) and formed a joint venture to provide semiconductor packaging and test services in Japan. As a result of the transaction, NMD changed its name to J-Devices Corporation. We invested $16.7 million for our original 30% equity interest and options to acquire additional equity interests. We exercised our options and increased our ownership interest in J-Devices from 30% to 60% in April 2013, for an aggregate purchase price of $67.4 million, and from 60% to 65.7% in January 2015, for an aggregate purchase price of $12.9 million. J-Devices is now owned 65.7% by Amkor and 34.3% by the former shareholders of NMD.

The remaining option is exercisable at our discretion and permits us to increase our ownership interest in J-Devices up to 80% in 2015 and thereafter by purchasing shares owned by the other shareholders. The option becomes exercisable in the fourth quarter of 2015, and if exercised, we would expect closing to occur in the first half of the following year, subject to regulatory approval. After we own 80% or more shares, the original shareholders of NMD have a put option which allows them to sell their shares to us. The exercise price for all options is payable in cash and is determined using a formula based on the net book value and a multiple of earnings before interest, taxes, depreciation and amortization of J-Devices.

The governance provisions currently applicable to J-Devices restrict our ability, even with our majority ownership, to cause J-Devices to take certain actions without the consent of the other investors. Accordingly, we account for our investment in J-Devices using the equity method of accounting. Under the equity method of accounting, we recognize our proportionate share of J-Devices’ net income or loss, which is after J-Devices' income taxes in Japan, during each accounting period as a change in our investment in unconsolidated affiliate. J-Devices' financial information is converted to U.S. GAAP and translated into U.S. dollars using Japanese yen as the functional currency. In addition, we record equity method adjustments as a change in our investment. The equity method adjustments include the amortization of basis differences as a result of the cost of our investment differing from our proportionate share of J-Devices' equity.

On June 30, 2014, J-Devices purchased 100% of the shares of our previously wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan. For additional information regarding this transaction, we refer you to Note 4.

Our share of the undistributed retained earnings of J-Devices amounted to approximately $63.5 million and $31.8 million as of December 31, 2014 and 2013, respectively.

13. Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2014		2013
	(In thousands)
Payroll and benefits	$	77,635	$	75,909
Deferred revenue and customer advances	56,829		44,764
Accrued settlement costs (Note 18)	32,414		43,324
Income taxes payable	31,580		17,528
Accrued interest	15,947		21,807
Accrued severance plan obligations (Note 15)	13,226		11,197
Acquisition payable (Note 3)	—		17,897
Other accrued expenses	31,366		31,826
Total accrued expenses	$	258,997	$	264,252

Accrued settlement costs relate to amounts due as a result of a patent license dispute (Note 18).

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

14. Debt

Following is a summary of short-term borrowings and long-term debt:

	December 31,
	2014			2013
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)	$	—		$	—
Senior notes:
7.375% Senior notes, due May 2018	345,000			345,000
6.625% Senior notes, due June 2021, $75 million related party	400,000			400,000
6.375% Senior notes, due October 2022	525,000			525,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes, due April 2014 (2)	—			56,350
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3)	—			—
Term loan, LIBOR plus 3.70%, due June 2016 (4)	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5)	80,000			—
Term loan, LIBOR plus 3.70%, due July 2017 (6)	30,000			90,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	5,000			10,000
Term loan, LIBOR plus 3.70%, due December 2019	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—			80,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8)	—			—
	1,525,000			1,646,350
Add: Unamortized premium	5,824			6,390
Less: Short-term borrowings and current portion of long-term debt	(5,000		)	(61,350		)
Long-term debt (including related party)	$	1,525,824		$	1,591,390

(1) In December 2014, we amended the senior secured revolving credit facility to increase the facility amount from $150.0 million to $200.0 million and extend its term to December 2019. The facility has a letter of credit sub-limit of $25.0 million. As amended, interest is charged under the facility at a floating rate based on the base rate in effect from time to time plus the applicable margins, which range from 0.00% to 0.50% for base rate revolving loans, or LIBOR plus 1.25% to 1.75% for LIBOR revolving loans. The borrowing base for the revolving credit facility is based on the amount of our eligible accounts receivable, which exceeded $200.0 million as of December 31, 2014.

(2) In April 2009, we issued $250.0 million of our 6.0% Convertible senior subordinated notes (the “2014 Notes”). The 2014 Notes were convertible at any time prior to the maturity date into our common stock at a price of approximately $3.02 per share, subject to adjustment. In June 2013, we completed a tender offer for the 2014 Notes and exchanged $193.7 million of the 2014 Notes for an aggregate 64.0 million shares of our common stock

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

and a cash payment of $11.6 million. In April 2014, holders of the 2014 Notes converted the remaining outstanding principal amount of $56.4 million into 18.6 million shares of our common stock.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. The loan is collateralized with substantially all the land, factories and equipment at our facilities in Korea. In June 2013, the facility was amended by extending the term by three years to June 2016. Principal is payable upon maturity. As of December 31, 2014, $41.0 million was available to be borrowed for general working capital purposes.

(4) In April 2013, we entered into a term loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016 for general working capital purposes and the repayment of inter-company debt. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. As of December 31, 2014, $80.0 million was available to be borrowed.

(5) In March 2014, we entered into a term loan agreement with a Korean bank pursuant to which we borrowed $80.0 million. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. Proceeds were used to prepay our term loan due March 2015. In January 2015, the term loan was amended and now bears interest at 1.80%.

(6) In June 2012, we entered into a term loan agreement for five years with a Korean bank collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In April 2014, we prepaid $60.0 million of the outstanding balance of the term loan. In October 2014, the term loan was amended and now bears interest at LIBOR plus 3.70%.

(7) In March 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through September 2017. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable in quarterly installments of $5.0 million starting in December 2014, with the remaining balance due at maturity. At December 31, 2014, $140.0 million was available to be borrowed for capital expenditures.

(8) In September 2012, Amkor Technology Taiwan Ltd, a subsidiary in Taiwan, entered into a revolving credit facility. Availability under the revolving credit facility was originally $44.0 million and subsequent availability steps down $5.0 million every six months from the original available balance. Principal is payable at maturity. As of December 31, 2014, $19.0 million was available to be drawn for general corporate purposes and capital expenditures.

Interest Rates

Interest is payable semiannually on our senior notes and interest is payable semi-annually, quarterly or monthly on our variable rate debt. Refer to the table above for the interest rates on our fixed rate debt and to the table below for the interest rates on our variable rate debt.

	Variable Interest Rates at December 31,
	2014		2013
Amkor Technology Korea, Inc.:
Term loan, LIBOR plus 3.70%, due June 2016	3.96	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017	3.49	%	—	%
Term loan, LIBOR plus 3.70%, due July 2017	3.93	%	4.14	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.28	%	3.76	%
Term loan, LIBOR plus 3.70%, due December 2019	3.93	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—	%	4.29	%

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Compliance with Debt Covenants

The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. The agreements governing our indebtedness contain a number of affirmative and negative covenants which restrict our ability to pay dividends and could restrict our operations. We have never paid a dividend to our stockholders and we do not have any present plans for doing so. We were in compliance with all of our covenants as of December 31, 2014 and 2013.

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2015	$	5,000
2016	70,000
2017	110,000
2018	345,000
2019	70,000
Thereafter	925,000
Total debt	$	1,525,000

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

15.Pension and Severance Plans

Defined Contribution Plans

We sponsor defined contribution plans in Malaysia, Taiwan and the U.S. Total defined contribution expense was $6.8 million, $5.2 million and $4.1 million for 2014, 2013 and 2012, respectively.

Korean Severance Plan

Our subsidiary in Korea participates in an accrued severance plan that covers employees with at least one year of service. To the extent eligible employees are terminated, our subsidiary in Korea would be required to make lump-sum severance payments on behalf of these eligible employees based on their length of service, seniority and rate of pay at the time of termination. Accrued severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date. Our contributions to the National Pension Plan of the Republic of Korea are deducted from accrued severance benefit liabilities.

The changes to the balance of our severance accrual are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at the beginning of year	$	145,373		$	126,762		$	106,715
Provision of severance benefits	17,593			26,550			19,667
Severance payments	(10,160		)	(10,402		)	(8,520		)
(Gain) loss on foreign currency	(5,926		)	2,463			8,900
	146,880			145,373			126,762
Payments remaining with the National Pension Fund	(219		)	(241		)	(249		)
Total severance obligation balance at the end of year	146,661			145,132			126,513
Less current portion of accrued severance obligation (Note 13)	13,226			11,197			9,516
Non-current portion of severance obligation	$	133,435		$	133,935		$	116,997

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Malaysia, the Philippines and Taiwan sponsor defined benefit plans (the “Plans”) that cover substantially all of their respective employees who are not covered by statutory plans. Charges to expense are based upon actuarial analyses.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2014 and 2013.

	For the Year Ended December 31,
	2014			2013
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	81,572		$	80,528
Service cost	5,042			5,909
Interest cost	3,051			3,170
Benefits paid	(2,620		)	(1,602		)
Actuarial losses (gains)	3,514			(2,513		)
Acquisition (Note 3)	—			13,017
Divestiture (Note 4)	(14,814		)	—
Effects of curtailment	—			(176		)
Settlement	—			(8,701		)
Foreign exchange gain	(1,736		)	(8,060		)
Projected benefit obligation at end of year	74,009			81,572
Change in plan assets:
Fair value of plan assets at beginning of year	50,304			58,146
Actual gain on plan assets	4,149			5,159
Employer contributions	3,756			1,120
Settlement	—			(8,701		)
Benefits paid	(2,620		)	(1,602		)
Foreign exchange loss	(818		)	(3,818		)
Fair value of plan assets at end of year	54,771			50,304
Funded status of the Plans at end of year	$	(19,238	)	$	(31,268	)

The accrued benefit liability, included in pension and severance obligations in the Consolidated Balance Sheets, as of December 31, 2014 and 2013 was $19.2 million and $31.3 million, respectively. The accumulated benefit obligation as of December 31, 2014 and 2013 was $44.1 million and $55.9 million, respectively.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes, by component, the change in accumulated other comprehensive income related to our Plans:

	Prior Service Cost		Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2012, net of tax	$	188	$	(5,561	)	$	(5,373	)
Amortization included in net periodic pension cost	250		114			364
Net gain arising during period	—		3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	250		4,110			4,360
Balance at December 31, 2013, net of tax	$	438	$	(1,451	)	$	(1,013	)
Amortization included in net periodic pension cost	102		110			212
Net gain arising during period	—		(1,724		)	(1,724		)
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	102		(1,614		)	(1,512		)
Balance at December 31, 2014, net of tax	$	540	$	(3,065	)	$	(2,525	)
Estimated amortization of cost to be included in 2015 net periodic pension cost	$	34	$	84		$	118

Information for pension plans with benefit obligations in excess of plan assets are as follows:

	December 31,
	2014		2013
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	74,044	$	73,326
Aggregate fair value of plan assets	54,771		41,957
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	11,854		24,877
Aggregate fair value of plan assets	—		—

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,042		$	5,909		$	6,362
Interest cost	3,051			3,170			3,270
Expected return on plan assets	(3,094		)	(3,508		)	(3,188		)
Amortization of prior service cost	116			231			291
Recognized actuarial loss	141			142			225
Net periodic pension cost	5,256			5,944			6,960
Curtailment (gain) loss	—			(176		)	1,089
Settlement loss (gain)	97			(120		)	(100		)
Total pension expense	$	5,353		$	5,648		$	7,949

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligation at December 31, 2014, 2013 and 2012:

	For the Year Ended December 31,
	2014		2013		2012
Discount rate for determining net periodic pension cost	3.9	%	3.9	%	4.2	%
Discount rate for determining benefit obligations at year end	4.2	%	3.9	%	4.0	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.1	%	4.5	%
Rate of compensation increase for determining benefit obligations at year end	4.7	%	4.1	%	4.1	%
Expected rate of return on plan assets for determining net periodic pension cost	6.2	%	6.3	%	6.3	%

The measurement date for determining the Plans’ assets and benefit obligations is December 31, each year. Discount rates are generally derived from yield curves constructed from high-quality corporate or foreign government bonds, for which the timing and amount of cash outflows approximate the estimated payouts.

The expected rate of return assumption is based on weighted-average expected returns for each asset class. Expected returns reflect a combination of historical performance analysis and the forward-looking views of the financial markets and include input from our actuaries. We have no control over the direction of our investments in our defined benefit plans in Taiwan as the local Labor Standards Law Fund mandates such contributions into a cash account balance at the Bank of Taiwan. The defined benefit pension plans in Japan and Malaysia are non-funded plans, and as such, no assets exist related to these plans. Our investment strategy for our Philippine defined benefit plan is based on long-term, sustained asset growth through low to medium risk investments. The current rate of return assumption targets are based on an asset allocation strategy for our Philippine plan assets of 55% debt securities (primarily Philippines and U.S.) and 45% equity securities (primarily U.S., Philippines and Europe). Philippine plan assets included Amkor common stock totaling $0.7 million and $0.6 million at December 31, 2014, and December 31, 2013, respectively.

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Notes to Consolidated Financial Statements — (Continued)

The fair value of our pension plan assets at December 31, 2014, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	5,742	$	—	$	5,742
Equity securities
Foreign securities	3,035		—		3,035
U.S. securities	19,790		—		19,790
	22,825		—		22,825
U.S. fixed income funds	4,321		—		4,321
Bonds
U.S. government bonds	—		2,840		2,840
Foreign treasury notes	10,156		—		10,156
	10,156		2,840		12,996
Taiwan retirement fund	8,632		—		8,632
Other	—		255		255
Total	$	51,676	$	3,095	$	54,771

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	4,542	$	—	$	4,542
Equity securities
Foreign securities	1,950		—		1,950
U.S. securities	18,223		—		18,223
	20,173		—		20,173
U.S. fixed income funds	4,186		—		4,186
Bonds
U.S. government bonds	—		2,087		2,087
Foreign treasury notes	10,374		—		10,374
	10,374		2,087		12,461
Taiwan retirement fund	8,840		—		8,840
Other	—		102		102
Total	$	48,115	$	2,189	$	50,304

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The Taiwan retirement fund category of our plan assets represents accounts that our subsidiaries in Taiwan have in a government labor retirement fund in the custody of the Bank of Taiwan. The accounts earn a minimum guaranteed rate of return. We have no control over the investment decisions of the fund which is invested in a mix of cash, domestic and foreign equity securities and domestic and foreign debt securities.

We expect to make contributions of $1.7 million during 2015. We closely monitor the funded status of the Plans with respect to legislative requirements. We intend to make at least the minimum contribution required by law each year.

The estimated future benefit payments related to our foreign defined benefit plans are as follows:

	Payments
	(In thousands)
2015	$	1,384
2016	2,019
2017	1,869
2018	2,430
2019	3,710
2020 to 2024	28,694

16. Accumulated Other Comprehensive Income (Loss)

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:

	Defined Benefit Pension			Foreign Currency Translation			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2012	$	(5,373	)	$	16,346		$	268		$	11,241
Other comprehensive income (loss) before reclassifications	3,996			(4,895		)	(10,961		)	(11,860		)
Amounts reclassified from accumulated other comprehensive (loss) income	364			—			—			364
Other comprehensive income (loss)	4,360			(4,895		)	(10,961		)	(11,496		)
Accumulated other comprehensive (loss) income at December 31, 2013	$	(1,013	)	$	11,451		$	(10,693	)	$	(255	)
Other comprehensive (loss) income before reclassifications	(1,724		)	623			(19,136		)	(20,237		)
Amounts reclassified from accumulated other comprehensive (loss) income	212			(12,587		)	—			(12,375		)
Other comprehensive loss	(1,512		)	(11,964		)	(19,136		)	(32,612		)
Accumulated other comprehensive loss at December 31, 2014	$	(2,525	)	$	(513	)	$	(29,829	)	$	(32,867	)

Amounts reclassified out of accumulated other comprehensive (loss) income are included as a component of net periodic pension cost (Note 15) or other (income) expense, net as a result of the release of accumulated foreign currency translation adjustments associated with the sale of our subsidiary in Japan (Note 4).

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

17. Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as 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, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of other non-current liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include cash equivalent money market funds and restricted cash money market funds. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets.

Our recurring fair value measurements consist of the following:

	December 31,
	2014		2013
	(In thousands)
Cash equivalent money market funds (Level 1)	$	145,938	$	300,352
Restricted cash money market funds (Level 1)	2,681		2,681

We also measure certain assets and liabilities, including property, plant and equipment and our investment in J-Devices, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis:

	December 31, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,268,619	$	1,275,824	$	1,321,443	$	1,276,390
Convertible senior subordinated notes (Level 1)	—		—		102,585		56,350
Term loans (Level 2)	254,999		255,000		320,000		320,000
Total debt	$	1,523,618	$	1,530,824	$	1,744,028	$	1,652,740

The estimated fair value of our senior and convertible senior subordinated notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our term loans was calculated using a discounted cash flow analysis, which utilized market based assumptions including forward interest rates adjusted for credit risk.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

18. Commitments and Contingencies

We have a letter of credit sub-facility of $25.0 million under our $200.0 million senior secured revolving credit facility that matures in December 2019. As of December 31, 2014, we had $0.4 million of standby letters of credit outstanding and had an additional $24.6 million available for letters of credit. Such standby letters of credit are used in the ordinary course of our business and are collateralized by our cash balances.

We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial.

Legal Proceedings

We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. We believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact to us. Our evaluation of the potential impact of these claims and legal proceedings on our business, liquidity, results of operations, financial condition or cash flows could change in the future.

Proceedings with Tessera, Inc.

Since March 2006, we have been involved in several proceedings with Tessera, Inc. (“Tessera”) related to a license agreement (the “License Agreement”) entered into in 1996 between Tessera and our predecessor. The proceedings generally involved disputes about whether or not Amkor owed Tessera royalties under the License Agreement with respect to certain packages, the termination of the License Agreement and post-termination infringement.

More recently, the proceedings included those instituted in the International Court of Arbitration of the International Chamber of Commerce in 2009 and 2011, the United States District Court for the District of Delaware in 2012, the Superior Court for San Francisco County in 2013, the Patent Trial and Appeal Board at the United States Patent and Trademark Office in 2013 and the California First District Court of Appeal in 2014.

In the second quarter of 2014, the arbitration panel awarded Tessera $113 million plus interest for these past royalties due under the License Agreement. In October 2014, the Superior Court for San Francisco County formally confirmed the arbitration panel's award and entered judgment against Amkor for $128 million plus post-judgment interest at 10% per annum. In November 2014, the California First District Court of Appeal affirmed the Superior Court’s ruling.

In January 2015, the parties entered into a settlement agreement to end all pending proceedings related to the dispute. Under the terms of the settlement, Amkor agreed to pay Tessera a total of $155.0 million in 16 equal quarterly recurring payments commencing in the first quarter of 2015, and continuing through the fourth quarter of 2018, and the parties agreed to a mutual release and dismissal of all claims relating to their pending litigation and arbitration proceedings, including the previously awarded judgment of $128 million plus interest. The settlement agreement also provides that Tessera and Amkor will look for opportunities to engage in potential technology collaboration.

During the three months ended December 31, 2014, we recorded a pre-tax charge of $87.1 million, of which $75.3 million was charged to cost of sales and $11.8 million was charged to interest expense. This charge reflects the aggregate amount due under the settlement agreement, net of amounts previously reserved. At December 31, 2014, the liability was $136.9 million, which reflects the fair value as estimated by discounting the future cash flows using a rate that reflects the estimated rate at which we could obtain financing with similar terms. The remaining amount of the gross settlement charge of $18.1 million will be accreted through interest expense over the four year term of the arrangement to reflect the impact of the time value of money due to the long term nature of the obligation and related payment terms. The current portion is recorded in accrued expenses (Note 13) and the non-current portion is recorded in other non-current liabilities in our consolidated financial statements.

83

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Leases

Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year are:

	Lease Payments
	(In thousands)
2015	$	13,116
2016	7,792
2017	6,336
2018	6,029
2019	6,194
Thereafter	12,624
Total	$	52,091

Rent expense amounted to $28.5 million, $23.8 million and $13.2 million for 2014, 2013 and 2012, respectively.

In order to provide packaging and test services, we purchase materials under various long-term supply contracts. Future minimum payments to be made under these contracts for the period 2015 through 2025 are $19.4 million.

19. Business Segments, Customer Concentrations and Geographic Information

We operate as a single operating segment as managed by our Chief Executive Officer, who is considered our chief operating decision maker ("CODM"). The CODM bears the ultimate responsibility for, and is actively engaged in, the allocation of resources and the evaluation of our operating and financial results. We have concluded that we have a single operating segment based on the following:

• We are managed under a functionally-based organizational structure with the head of each function reporting directly to the CODM;

• We assess performance, including incentive compensation, based on consolidated operating performance and financial results;

• Our CODM allocates resources and makes other operating decisions based on specific customer business opportunities and

• We have an integrated process for the design, development and manufacturing services we provide to all of our customers. We also have centralized sales and administrative functions.

The following table presents net sales by product group:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
Advanced products	$	1,552,948	$	1,451,664	$	1,302,145
Mainstream products	1,576,492		1,504,786		1,457,401
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table presents net sales by country based on customer location:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
China	$	270,282	$	47,202	$	28,641
Ireland	175,095		97,180		110,529
Japan	268,420		394,834		349,360
Singapore	432,942		496,601		452,737
Taiwan	212,719		144,825		99,047
Thailand	104,608		116,376		139,134
Other foreign countries	533,951		454,218		437,148
Total foreign countries	1,998,017		1,751,236		1,616,596
United States	1,131,423		1,205,214		1,142,950
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

One customer accounted for 17.5%, 23.7% and 21.3% of consolidated net sales in 2014, 2013 and 2012, respectively. Another customer accounted for 13.2% and 10.5% of consolidated net sales in 2014 and 2013, respectively.

The following table presents property, plant and equipment, net, based on the physical location of the asset:

	Property, Plant and Equipment, Net at December 31,
	2014		2013
	(In thousands)
China	$	575,207	$	524,967
Japan	145		10,799
Korea	948,192		916,777
Malaysia	50,137		61,080
Philippines	301,291		240,187
Taiwan	317,192		236,178
Other foreign countries	293		93
Total foreign countries	2,192,457		1,990,081
United States	14,019		16,472
Total property, plant and equipment, net	$	2,206,476	$	2,006,553

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

20. Reductions in Force

As part of our ongoing efforts to improve our manufacturing operations and manage costs, we regularly evaluate our staffing levels and facility requirements compared to business needs. The following table summarizes changes to the balance of our accrual associated with these efforts. “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	2014			2013
	(In thousands)
Beginning balance	$	—		$	1,607
Charges	3,889			10,506
Cash Payments	(3,973		)	(12,531		)
Non-cash Amounts	84			418
Ending balance	$	—		$	—

During the years ended December 31, 2014, 2013 and 2012, we reduced our workforce through workforce reduction programs. We recorded $3.9 million, $10.5 million and $11.2 million in charges in 2014, 2013 and 2012, respectively. All charges related primarily to cost of sales, except for $3.9 million of charges in 2012, related to selling, general and administrative expenses.

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SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

	Balance at Beginning of Period		Additions (Credited) Charged to Expense		Write-offs		(a) Other		Balance at End of Period
	(In thousands)
Deferred tax asset valuation allowance:
Year ended December 31, 2012	$	214,269	(1,626	)	(1,486	)	(1,400	)	$	209,757
Year ended December 31, 2013	209,757		(16,860	)	(15,555	)	1,841		179,183
Year ended December 31, 2014	179,183		(10,838	)	(2,534	)	(15,964	)	149,847

(a) Column represents adjustments to the deferred tax asset valuation allowance directly through stockholders’ equity for changes in accumulated other comprehensive income (loss) related to our foreign defined benefit pension plans and the sale of a subsidiary in 2014.

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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

We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed in our periodic reports to the Securities and Exchange Commission (“SEC”) is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to our management, including the Chief Executive Officer and the Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure, based on the definition of “disclosure controls and procedures” in Rule 13a-15(e) and Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended. In designing and evaluating the disclosure controls and procedures, management recognizes that any disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management necessarily is required to apply its judgment in evaluating the cost-benefit relationship of possible disclosure controls and procedures.

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of December 31, 2014, and concluded those disclosure controls and procedures were effective as of that date.

Management’s Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f). 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.

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. 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 and procedures may deteriorate.

Management conducted an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2014, based on the framework established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on the results of this evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2014, based on criteria in Internal Control — Integrated Framework (2013) issued by the COSO.

The effectiveness of our internal control over financial reporting as of December 31, 2014, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears under Item 8 of this Annual Report on Form 10-K.

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Changes in Internal Control Over Financial Reporting

As previously reported, we are implementing an enterprise resource planning (“ERP”) system in a multi-year program on a world-wide basis. During the three months ended December 31, 2014, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information

None.

PART III

Item 10. Directors, Executive Officers and Corporate Governance

The information required by this Item 10, with the exception of information relating to the Code of Business Conduct as disclosed below, is incorporated herein by reference from the material included under the captions “Election of Directors,” “Executive Officers,” and “Section 16(a) Beneficial Ownership Reporting Compliance” in our definitive proxy statement (to be filed pursuant to Regulation 14A) for our 2015 Annual Meeting of Stockholders.

Additionally, our Code of Business Conduct, Code of Ethics for Directors, Corporate Governance Guidelines, and the charters of the Audit Committee, Nominating and Governance Committee and Compensation Committee of our Board of Directors are available and maintained on our web site (http://www.amkor.com). We intend to disclose on our web site future amendments or waivers of our Code of Business Conduct required to be disclosed pursuant to applicable rules and regulations.

Item 11. Executive Compensation

The information required by this Item 11 is incorporated herein by reference from the material included under the captions “Executive Compensation,” “Compensation Committee Interlocks and Insider Participation” and “Report of the Compensation Committee of the Board of Directors” in our definitive proxy statement (to be filed pursuant to Regulation 14A) for our 2015 Annual Meeting of Stockholders.

89

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

The information required by this Item 12, with the exception of the equity compensation plan information presented below, is incorporated herein by reference to our definitive proxy statement (to be filed pursuant to Regulation 14A) for our 2015 Annual Meeting of Stockholders.

EQUITY COMPENSATION PLAN

The following table summarizes our equity compensation plan as of December 31, 2014:

	(a) Number of Securities to be Issued Upon Exercise of Outstanding Options (In thousands)	(b) Weighted-Average Exercise Price of Outstanding Options		(c) Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column(a) (In thousands)
Equity compensation plan approved by stockholders (1)	3,822	$	6.25	11,370
Equity compensation plans not approved by stockholders	—	—		—
Total equity compensation plans	3,822			11,370

(1) As of December 31, 2014, a total of 11.4 million shares were reserved for issuance under the 2007 Plan. Shares available for issuance under our 2007 Plan can be granted pursuant to stock options, restricted stock, restricted stock units, stock appreciation rights, performance units and performance shares.

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

The information required by this Item 13 is incorporated herein by reference from the material included under the captions “Certain Relationships and Related Transactions” and “Proposal One — Election of Directors” in our definitive proxy statement (to be filed pursuant to Regulation 14A) for our 2015 Annual Meeting of Stockholders.

Item 14. Principal Accountant Fees and Services

The information required by this Item 14 is incorporated herein by reference from the material included under the proposal “Ratification of Appointment of Independent Registered Public Accounting Firm” in our definitive proxy statement (to be filed pursuant to Regulation 14A) for our 2015 Annual Meeting of Stockholders.

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) Financial Statements, Financial Statement Schedules and Exhibits

The financial statements and schedules filed as part of this Annual Report on Form 10-K are listed in the index under Part II, Item 8 of this Annual Report.

In accordance with Rule 3-09 of Regulation S-X, the consolidated financial statements of J-Devices Corporation for the years ended December 31, 2014 (audited), 2013 and 2012 (unaudited), are included in this Annual Report on Form 10-K as Exhibit 99.1.

The exhibits required by Item 601 of Regulation S-K which are filed with this report or incorporated by reference herein, are set forth in the Exhibit Index. Management contracts or compensatory plans or arrangements are identified by an asterisk.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this Annual Report on Form 10-K to be signed, on its behalf by the undersigned, thereunto duly authorized.

AMKOR TECHNOLOGY, INC.

By:	/s/  Stephen D. Kelley
	Stephen D. Kelley President and Chief Executive Officer
	Date:	February 19, 2015

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Stephen D. Kelley and Joanne Solomon, and each of them, his attorneys-in-fact, and agents, each with the power of substitution, for him and in his name, place and stead, in any and all capacities, to sign any and all amendments to this Report on Form 10-K, and all documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he might or could do in person, hereby ratifying and conforming all that said attorneys-in-fact and agents of any of them, or his or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Name	Title	Date
/s/  Stephen D. Kelley	President and Chief Executive Officer	February 19, 2015
Stephen D. Kelley
/s/  Joanne Solomon	Executive Vice President and Chief Financial Officer	February 19, 2015
Joanne Solomon
/s/  James J. Kim	Executive Chairman	February 19, 2015
James J. Kim
/s/  John T. Kim	Executive Vice Chairman	February 19, 2015
John T. Kim
/s/ Susan Y. Kim	Director	February 19, 2015
Susan Y. Kim
/s/  Roger A. Carolin	Director	February 19, 2015
Roger A. Carolin
/s/  Winston J. Churchill	Director	February 19, 2015
Winston J. Churchill

91

Name	Title	Date
/s/  Robert R. Morse	Director	February 19, 2015
Robert R. Morse
/s/  John F. Osborne	Director	February 19, 2015
John F. Osborne
/s/  David N. Watson	Director	February 19, 2015
David N. Watson
/s/  James W. Zug	Director	February 19, 2015
James W. Zug

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EXHIBIT INDEX

2.1	Sales Contract of Commodity Premises between Shanghai Waigaoqiao Free Trade Zone Xin Development Co., Ltd. and Amkor Assembly & Test (Shanghai) Co., Ltd. dated May 7, 2004.(4)
3.1	Certificate of Incorporation.(1)
3.2	Certificate of Correction to Certificate of Incorporation.(3)
3.3	Restated Bylaws as amended on November 5, 2013.(21)
4.1	Specimen Common Stock Certificate.(2)
4.2	Indenture, dated as of April 1, 2009, between Amkor Technology, Inc. and U.S. Bank National Association, as trustee regarding the 6.00% Convertible Senior Subordinated Notes due 2014.(8)
4.3	Form of Note for the 6.00% Convertible Senior Subordinated Notes due 2014.(8)
4.4	Letter Agreement, dated March 26, 2009, between Amkor Technology, Inc., James J. Kim and 915 Investments, LP.(8)
4.5	Indenture, dated May 4, 2010, by and between Amkor Technology, Inc. and U.S. Bank National Association, as trustee, regarding the 7.375% Senior Notes due 2018.(9)
4.6	Indenture, dated May 20, 2011, by and between Amkor Technology, Inc. and U.S. Bank National Association, as trustee, regarding the 6.625% Senior Notes due 2021.(11)
4.7	Letter Agreement, dated May 17, 2011, between Amkor Technology, Inc., James J. Kim and 915 Investments, LP.(11)
4.8	Indenture, dated September 21, 2012, by and between Amkor Technology, Inc. and U.S. Bank National Association, as trustee, regarding the 6.375% Senior Notes due 2022.(15)
10.1	Form of Indemnification Agreement for directors and officers.(2)
10.2	1998 Stock Plan, as amended.(7)*
10.3	Form of Stock Option Agreement under the 1998 Stock Plan.(5)*
10.4	Contract of Lease between Corinthian Commercial Corporation and Amkor/Anam Pilipinas Inc., dated October 1, 1990.(1)
10.5	Contract of Lease between Salcedo Sunvar Realty Corporation and Automated Microelectronics, Inc., dated May 6, 1994.(1)
10.6	Lease Contract between AAPI Realty Corporation and Amkor/Anam Advanced Packaging, Inc., dated November 6, 1996.(1)
10.7	2003 Nonstatutory Inducement Grant Stock Plan, as amended.(7)*
10.8	Amended and Restated 2007 Equity Incentive Plan.(12)*
10.9	Form of Stock Option Agreement under the Amended and Restated 2007 Equity Incentive Plan.*
10.10	Form of Restricted Stock Award Agreement under the Amended and Restated 2007 Equity Incentive Plan. (14)*
10.11	Executive Incentive Bonus Plan.(12)*
10.12	Kun-Mortgage Agreement, dated March 30, 2007, between Woori Bank and Amkor Technology Korea, Inc.(6)
10.13	2009 Voting Agreement, dated as of March 26, 2009, between Amkor Technology, Inc., James J. Kim and 915 Investments, LP.(8)
10.14	Second Amended and Restated Loan and Security Agreement, dated as of June 28, 2012, among Amkor Technology, Inc., its subsidiaries from time to time party thereto, the lending institutions from time to time party thereto and Bank of America, N.A., as administrative agent.(13)
10.15	First Amendment, dated December 24, 2014, to Second Amended and Restated Loan and Security Agreement, dated as of June 28, 2012, among Amkor Technology, Inc., its subsidiaries from time to time party thereto, the lending institutions from time to time party thereto and Bank of America, N.A., as administrative agent.(22)
10.16	Amendment to Kun-Mortgage Agreement, dated May 24, 2010, by and between Amkor Technology Korea, Inc. and Woori Bank.(10)
10.17	Loan Agreement, dated June 28, 2012, by and between Amkor Technology Korea, Inc. and The Korea Development Bank (13)

93

10.18	Factory Mortgage Agreement, dated June 28, 2012, by and between The Korea Development Bank and Amkor Technology Korea, Inc.(13)
10.19	Loan Agreement, dated November 23, 2012, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(16)
10.20	Form of Amendment to Factory Mortgage Agreement, dated November 23, 2012, by and between The Korea Development Bank and Amkor Technology Korea, Inc.(16)
10.21	Amendment to Loan Agreement, dated November 22, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank(21)
10.22	Credit Facility Agreement, dated March 11, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank(17)
10.23	General Terms and Conditions for Bank Credit Transactions, dated March 11, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank(17)
10.24	Loan Agreement, dated April 29, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(20)
10.25	Amendment to Factory Mortgage Agreement, dated April 29, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(20)
10.26	Guarantee, dated April 29, 2013, by and between Amkor Technology, Inc. and The Korea Development Bank.(20)
10.27	Amendment to Loan Agreement, dated December 27, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank(21)
10.28	Amendment to Kun Mortgage Agreement, dated April 19, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank.(20)
10.29	Employment Offer Letter, dated April 30, 2013, between Amkor Technology, Inc. and Stephen D. Kelley.(18)*
10.30	Retirement Agreement and Release, dated May 8, 2013, between Amkor Technology, Inc. and Kenneth T. Joyce.(19)*
10.31	Separation and Consulting Agreement, dated July 17, 2013, between Amkor Technology, Inc. and Michael J. Lamble.(20)*
12.1	Computation of Ratio of Earnings to Fixed Charges
21.1	List of subsidiaries of the Registrant.
23.1	Consent of PricewaterhouseCoopers LLP.
23.2	Consent of PricewaterhouseCoopers Aarata
31.1	Certification of Stephen D. Kelley, Chief Executive Officer of Amkor Technology, Inc., Pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended.
31.2	Certification of Joanne Solomon, Chief Financial Officer of Amkor Technology, Inc., Pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended.
32.1	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.1	Consolidated Financial Statements of J-Devices Corporation
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
*	Indicates management compensatory plan, contract or arrangement.

94

(1)	Incorporated by reference to the Company’s Registration Statement on Form S-1 filed October 6, 1997 (File No. 333-37235).
(2)	Incorporated by reference to the Company’s Registration Statement on Form S-1 filed on October 6, 1997, as amended on March 31, 1998 (File No. 333-37235).
(3)	Incorporated by reference to the Company’s Registration Statement on Form S-1 filed on April 8, 1998, as amended on August 26, 1998 (File No. 333-49645).
(4)	Incorporated by reference to the Company’s Quarterly Report on Form 10-Q filed August 6, 2004.
(5)	Incorporated by reference to the Company’s Annual Report on Form 10-K filed on March 16, 2006.
(6)	Incorporated by reference to the Company’s Quarterly Report on Form 10-Q filed May 4, 2007.
(7)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed August 7, 2008.
(8)	Incorporated by reference to the Company’s Current Report on Form 8-K filed on April 1, 2009.
(9)	Incorporated by reference to the Company’s Current Report on Form 8-K filed May 5, 2010.
(10)	Incorporated by reference to the Company’s Current Report on Form 8-K filed May 27, 2010.
(11)	Incorporated by reference to the Company's Current Report on Form 8-K filed May 20, 2011.
(12)	Incorporated by reference to the Company's Proxy Statement on Schedule 14A filed April 5, 2012.
(13)	Incorporated by reference to the Company's Current Report on Form 8-K filed on July 2, 2012.
(14)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed August 2, 2012.
(15)	Incorporated by reference to the Company's Current Report on Form 8-K filed September 21, 2012.
(16)	Incorporated by reference to the Company's Current Report on Form 8-K filed November 27, 2012.
(17)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed May 3, 2013.
(18)	Incorporated by reference to the Company's Current Report on Form 8-K filed May 3, 2013.
(19)	Incorporated by reference to the Company's Current Report on Form 8-K filed May 10, 2013.
(20)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed August 2, 2013.
(21)	Incorporated by reference to the Company's Annual Report on Form 10-K filed February 28, 2014.
(22)	Incorporated by reference to the Company's Current Report on Form 8-K filed December 24, 2014.

95

EX-10.9

Exhibit 10.9

AMKOR TECHNOLOGY, INC.

AMENDED AND RESTATED 2007 EQUITY INCENTIVE PLAN

STOCK OPTION AWARD AGREEMENT

Unless otherwise defined herein, the terms defined in the Amkor Technology, Inc. Amended and Restated 2007 Equity Incentive Plan (the “Plan”) will have the same defined meanings in this Stock Option Award Agreement (the “Award Agreement”).

Participant Name:

Address:

You have been granted an Option to purchase Common Stock of Amkor Technology, Inc. (the “Company”), subject to the terms and conditions of the Plan and this Award Agreement, as follows:

Grant Number

Date of Grant

Vesting Commencement Date    See Vesting Schedule Below

Exercise Price per Share

Total Number of Shares Granted

Type of Option:    ___ Incentive Stock Option Nonstatutory Stock Option

Term/Expiration Date:

1.    Grant of Option. The Company hereby grants to theindividual named in this Award Agreement (the “Participant”) an option (the “Option”) to purchase the number of Shares, as set forth in this Award Agreement, at the exercise price per Share set forth in this Award Agreement (the “Exercise Price”), subject to all of the terms and conditions in this Award Agreement and the Plan, which is incorporated herein by reference. In the event of a conflict between the terms and conditions of the Plan and the terms and conditions of this Award Agreement, the terms and conditions of the Plan shall prevail.

If designated in the Award Agreement as an Incentive Stock Option ("ISO"), this Option is intended to qualify as an Incentive Stock Option under Section 422 of the Code. However, if this Option is intended to be an Incentive Stock Option, to the extent that it exceeds the $100,000 rule of Code Section 422(d) it shall be treated as a Nonstatutory Stock Option (“NSO”).

2.    Vesting Schedule. Except as provided in Section 4 and subject to any acceleration provisions contained in the Plan or set forth below, this Option will become vested and exercisable in accordance with the following schedule. Shares scheduled to vest on a certain date or upon the occurrence of a certain condition will not vest in Participant in accordance with any of the provisions of this Award Agreement, unless Participant will have been continuously a Service Provider from the Date of Grant until the date such vesting is scheduled to occur:

3.    Termination Period. In the event that Participant ceases to be a Service Provider, the portion of the Option that is not vested as of such date shall be immediately forfeited with no consideration due Participant and the portion of the Option that is vested and exercisable as of the date of such cessation shall remain exercisable (except as otherwise provided below): (x) if Participant ceases to be a Service Provider due to Participant’s resignation for any reason (other than Retirement (as defined in the Plan)) or due to his termination by the Company for any reason, for three (3) months after Participant ceases to be a Service Provider; (y) if Participant ceases to be a Service Provider due to his death or Disability, for twenty-four (24) months after Participant ceases to be a Service Provider; and (z) if Participant ceases to be a Service Provider due to Retirement, for twenty-four (24) months following Participant’s Retirement. If the exercise of the Option following the termination of Participant’s status as a Service Provider (other than upon Participant’s death or Disability) would result in liability under Section 16(b), then the vested portion of the Option will terminate on the earlier of (A) the Term/Expiration Date or (B) the tenth (10^th) day after the last date on which such exercise would result in such liability under Section 16(b). If the exercise of the Option following the termination of Participant’s status as a Service Provider (other than upon Participant’s death or Disability) would be prohibited at any time solely because the issuance of Shares would violate the registration requirements under the Securities Act, then the vested portion of the Option will terminate on the earlier of (A) the Term/Expiration Date or (B)  three (3) months after the last day on which the exercise of the Option would be in violation of such registration requirements. Notwithstanding anything contained herein to the contrary, in no event shall this Option be exercised later than the Term/Expiration Date as provided above. In addition, the Option may be subject to earlier termination as provided in Section 16(c) of the Plan.

4.    Administrator Discretion. The Administrator, in its discretion, may accelerate the vesting of the balance, or some lesser portion of the balance, of the unvested Option at any time, subject to the terms of the Plan. If so accelerated, such Option will be considered as having vested as of the date specified by the Administrator.

5.    Exercise of Option. This Option is exercisable during its term in accordance with the Vesting Schedule set out in the Award Agreement and the applicable provisions of the Plan and this Award Agreement. This Option is exercisable by completing the transaction through the Company's captive broker assisted transactions via voice response system or the Internet secured transaction system.

The Option shall be deemed to be exercised upon receipt by the Company of a fully executed exercise notice or other form as may be required by the Company (the “Exercise Notice”). The Exercise Notice shall be accompanied by payment of the aggregate Exercise Price as to the number of Shares in respect of which the Option is being exercised (the “Exercised Shares”), together with any applicable tax withholding. No Shares shall be issued pursuant to the exercise of this Option unless such issuance and exercise complies with Applicable Laws.

6.    Method of Payment. Payment of the aggregate Exercise Price shall be by any of the following, or a combination thereof, at the election of Participant:

(a)    Cash;

(b)    Check;

(c)    Consideration received by the Company under a cashless exercise program implemented by the Company in connection with the Plan;

(d)    Surrender of other Shares which have a Fair Market Value on the date of exercise equal to the aggregate Exercise Price of the Exercised Shares, provided that accepting such Shares, in the sole discretion of the Administrator, will not result in any adverse accounting consequences to the Company; or

(e)    Retention by the Company of a number of the Shares otherwise deliverable to the Participant on exercise of the Option having an aggregate Fair Market Value (determined on the date of exercise) equal to the aggregate Exercise Price of the Exercised Shares, unless, in the case of Participants who are not subject to the reporting requirements of Section 16 of the Exchange Act, such right is revoked by the Administrator prior to the time of exercise.

In all events, the aggregate Exercise Price must be paid to the Company within three days after the date of exercise.

7.    Tax Obligations.

(a)    Withholding Taxes. Notwithstanding any contrary provision of this Award Agreement, no certificate representing the Shares will be issued to Participant, unless and until satisfactory arrangements (as determined by the Administrator) have been made by Participant with respect to the payment of income, employment and other taxes which the Company determines must be withheld with respect to such exercise. If Participant fails to make satisfactory arrangements for the payment of any required tax withholding obligations hereunder at the time of the Option exercise, Participant acknowledges and agrees that the Company may refuse to honor the exercise and refuse to deliver Shares if such withholding amounts are not delivered at the time of exercise. A Participant may satisfy his or her tax withholding obligations by directing the Company to retain a number of the Shares otherwise deliverable to the Participant upon exercise of the Option having an aggregate Fair Market Value (determined on the date of exercise) equal to the minimum withholding taxes due, unless, in the case of Participants who are not subject to the reporting requirements of Section 16 of the Exchange Act, such right is revoked by the Administrator prior to the time of exercise.

(b)    Notice of Disqualifying Disposition of ISO Shares. If the Option granted to Participant herein is an ISO, and if Participant sells or otherwise disposes of any of the Shares acquired pursuant to the ISO on or before the later of (i) the date two (2) years after the Date of Grant or (ii) the date one (1) year after the date of exercise, Participant will immediately notify the Company in writing of such disposition. Participant agrees that Participant may be subject to income tax withholding by the Company on the compensation income recognized by Participant as a result of such disposition.

(c)    Code Section 409A. The Option is intended to comply with, or be exempt from, Code Section 409A and all regulations, guidance, compliance programs and other interpretative authority thereunder, and shall be interpreted in a manner consistent therewith. Notwithstanding anything contained herein to the contrary, in the event the Option is subject to Code Section 409A, the Company may, in its sole discretion and without Participant’s prior consent, amend the Plan and/or the Award Agreement, adopt policies and procedures, or take any other actions as deemed appropriate by the Company to (i) exempt the Option from the application of Code Section 409A, (ii) preserve the intended tax treatment of the Option or (iii) comply with the requirements of Code Section 409A. Notwithstanding anything contained herein to the contrary, in no event shall the Company or any Subsidiary have any liability or obligation to Participant or any other person in the event that the Plan or the Option is not exempt from, or compliant with, Code Section 409A.

8.    Rights as Stockholder. Neither Participant nor any person claiming under or through Participant will have any of the rights or privileges of a stockholder of the Company in respect of any Shares deliverable hereunder unless and until certificates representing such Shares have been issued, recorded on the records of the Company or its transfer agents or registrars, and delivered to Participant. After such issuance, recordation and delivery, Participant will have all the rights of a stockholder of the Company with respect to such Shares, including voting and receipt of dividends and distributions on such Shares.

9.    No Guarantee of Continued Service. PARTICIPANT ACKNOWLEDGES AND AGREES THAT THE VESTING OF THE OPTION PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (OR THE SUBSIDIARY EMPLOYING OR RETAINING PARTICIPANT) AND NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED THE OPTION OR ACQUIRING SHARES HEREUNDER. PARTICIPANT FURTHER ACKNOWLEDGES AND AGREES THAT THIS AWARD AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND WILL NOT INTERFERE IN ANY WAY WITH PARTICIPANT’S RIGHT OR THE RIGHT OF THE COMPANY (OR THE SUBSIDIARY EMPLOYING OR RETAINING PARTICIPANT) TO TERMINATE PARTICIPANT’S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE.

10.    Address for Notices. Any notice to be given to the Company under the terms of this Award Agreement will be addressed to the Company, in care of its Stock Plan Administrator at Amkor Technology, Inc., 2045 East Innovation Circle, Tempe, Arizona, 85284, or at such other address as the Company may hereafter designate in writing.

11.    Non-Transferability of Option. This Option may not be transferred in any manner otherwise than by will or by the laws of descent or distribution and may be exercised during the lifetime of Participant only by Participant.

12.    Binding Agreement. Subject to the limitation on the transferability of this grant contained herein, this Award Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto (provided that neither the Option nor this Award Agreement may be assigned by Participant).

13.    Additional Conditions to Issuance of Stock. If at any time the Company determines, in its discretion, that the listing, registration or qualification of the Shares upon any securities exchange or under any state or federal law, or the consent or approval of any governmental regulatory authority is necessary or desirable as a condition to the issuance of Shares to Participant (or his or her estate), such issuance will not occur unless and until such listing, registration, qualification, consent or approval has been effected or obtained free of any conditions not acceptable to the Company. Assuming such compliance, for income tax purposes the Exercised Shares will be considered transferred to Participant on the date the Option is exercised with respect to such Exercised Shares.

14.    Administrator Authority. The Administrator has the power to interpret the Plan and this Award Agreement and to adopt such rules for the administration, interpretation and application of the Plan and this Award Agreement as are consistent therewith and to interpret or revoke any such rules (including, but not limited to, the determination of whether or not any Shares subject to the Option have vested). All actions taken and all interpretations and determinations made by the Administrator in good faith will be final and binding upon Participant, the Company and all other interested persons. No member of the Administrator will be personally liable for any action, determination or interpretation made in good faith with respect to the Plan or this Award Agreement.

15.    Electronic Delivery. The Company may, in its sole discretion, decide to deliver any documents related to the Option or the Plan by electronic means or request Participant’s consent to participate in the Plan by electronic means. Participant hereby consents to receive such documents by electronic delivery and agrees to participate in the Plan through any on-line or electronic system established and maintained by the Company or another third party designated by the Company.

16.    Captions. Captions provided herein are for convenience only and are not to serve as a basis for interpretation or construction of this Award Agreement.

17.    Agreement Severable. In the event that any provision in this Award Agreement is held invalid or unenforceable, such provision will be severable from, and such invalidity or unenforceability will not be construed to have any effect on, the remaining provisions of this Award Agreement.

18.    Modifications to the Award Agreement. The Plan and this Award Agreement constitute the entire understanding of the parties on the subjects covered herein. Participant expressly warrants that he or she is not accepting this Award Agreement in reliance on any promises, representations, or inducements other than those contained herein. Except as otherwise provided herein or in the Plan, modifications to this Award Agreement can be made only in an express written contract executed by Participant and a duly authorized officer of the Company.

19.    Amendment, Suspension or Termination of the Plan. By accepting this Award, Participant expressly warrants that he or she has received an Option under the Plan, and has received, read and understands the Plan. Participant understands that the Plan is discretionary in nature and may be amended, suspended or terminated by the Company at any time.

20.    Governing Law. This Award Agreement will be governed by the laws of the State of Delaware without giving effect to the conflict of law principles thereof. For purposes of litigating any dispute that arises under this Option or this Award Agreement, the parties hereby submit to and consent to the jurisdiction of the State of Arizona, and agree that such litigation will be conducted solely in the courts of Maricopa County, Arizona, or the federal courts for the United States for the District of Arizona.

21.    Agreement. Participant’s receipt of the Option and this Award Agreement constitutes Participant’s agreement to be bound by the terms and conditions of this Award

Agreement and the Plan. Participant’s signature is not required in order to make this Award Agreement effective.

Optionee:    Amkor Technology, Inc.

By:

(Name)            

Date:     Date:

EX-12.1

Exhibit 12.1

AMKOR TECHNOLOGY, INC.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,
	2014		2013		2012		2011		2010
	(In thousands)
Earnings
Income before taxes and equity in earnings of unconsolidated affiliate	$	136,078	$	123,987	$	54,111	$	93,134	$	244,724
Interest expense	107,688		103,027		94,280		82,869		96,340
Amortization of deferred debt issuance costs and premiums	2,237		2,880		3,663		3,737		4,505
Interest portion of rent (1)	9,502		7,947		4,386		5,020		5,450
	$	255,505	$	237,841	$	156,440	$	184,760	$	351,019
Fixed Charges
Interest expense	$	107,688	$	103,027	$	94,280	$	82,869	$	96,340
Capitalized interest	6,912		1,740		—		—		—
Amortization of debt issuance costs and premiums	2,237		2,880		3,663		3,737		4,505
Interest portion of rent (1)	9,502		7,947		4,386		5,020		5,450
	$	126,339	$	115,594	$	102,329	$	91,626	$	106,295
Ratio of earnings to fixed charges	2.0		2.1		1.5		2.0		3.3

(1) Represents one-third of total rent expense which we believe is a reasonable estimate of the interest component of rent expense.

EX-21.1

Exhibit 21.1

AMKOR TECHNOLOGY, INC.

LIST OF SUBSIDIARIES

Subsidiary	Jurisdiction of Organization
Amkor Advanced Technology Taiwan, Inc.	Taiwan
Amkor Assembly & Test (Shanghai) Co., Ltd.	China
Amkor Technology Euroservices, S.A.R.L.	France
Amkor Technology Holding, B.V.	Netherlands
Amkor Technology Japan, K.K.	Japan
Amkor Technology Korea, Inc.	Korea
Amkor Technology Limited	Cayman Islands
Amkor Technology Malaysia Sdn. Bhd.	Malaysia
Amkor Technology Philippines, Inc. (A Branch of a Singapore Company)	Philippines
Amkor Technology Singapore Investment Pte. Ltd.	Singapore
Amkor Technology Singapore Holding Pte. Ltd.	Singapore
Amkor Technology Taiwan Ltd.	Taiwan
Amkor Worldwide Services LLC	Delaware
Guardian Assets, Inc.	Delaware
Unitive International N.V.	Curacao

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-62891, 333-86161, 333-63430, 333-100814 and 333-149376) of Amkor Technology, Inc. of our report dated February 19, 2015, relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/  PricewaterhouseCoopers LLP

Phoenix, Arizona

February 19, 2015

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in the Registration Statements on Form S‑8 (Nos. 333-62891, 333-86161, 333-63430, 333-100814 and 333-149376) of Amkor Technology, Inc. of our report dated February 19, 2015 relating to the consolidated financial statements of J-Devices Corporation, which appears in this Annual Report on Form 10‑K of Amkor Technology, Inc.

/s/ PricewaterhouseCoopers Aarata
Tokyo, Japan
February 19, 2015

1

EX-31.1

Exhibit 31.1

SECTION 302(a) CERTIFICATION

I, Stephen D. Kelley, certify that:

1. I have reviewed this Annual Report on Form 10-K of Amkor Technology, Inc.;

2. Based on my knowledge, this Annual 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 Annual Report;

3. Based on my knowledge, the financial statements, and other financial information included in this Annual 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 Annual Report;

4. The registrant's other certifying officer 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 Annual 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 Annual Report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this Annual Report based on such evaluation; and

d) Disclosed in this Annual Report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of this Annual Report) 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 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 controls over financial reporting.

/s/  Stephen D. Kelley
By:	Stephen D. Kelley
Title:	President and Chief Executive Officer
Date:	February 19, 2015

EX-31.2

Exhibit 31.2

SECTION 302(a) CERTIFICATION

I, Joanne Solomon, certify that:

1. I have reviewed this Annual Report on Form 10-K of Amkor Technology, Inc.;

2. Based on my knowledge, this Annual 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 Annual Report;

3. Based on my knowledge, the financial statements, and other financial information included in this Annual 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 Annual Report;

4. The registrant's other certifying officer 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 Annual 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 Annual Report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this Annual Report based on such evaluation; and

d) Disclosed in this Annual Report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of this Annual Report) 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 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 controls over financial reporting.

/s/ Joanne Solomon
By:	Joanne Solomon
Title:	Executive Vice President and Chief Financial Officer
Date:	February 19, 2015

EX-32

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL

OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Stephen D. Kelley, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of Amkor Technology, Inc. on Form 10-K for the year ended December 31, 2014 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-K fairly presents in all material respects the financial condition and results of operations of Amkor Technology, Inc.

/s/  Stephen D. Kelley
By:	Stephen D. Kelley
Title:	President and Chief Executive Officer
Date:	February 19, 2015

I, Joanne Solomon, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of Amkor Technology, Inc. on Form 10-K for the year ended December 31, 2014 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-K fairly presents in all material respects the financial condition and results of operations of Amkor Technology, Inc.

/s/ Joanne Solomon
By:	Joanne Solomon
Title:	Executive Vice President and Chief Financial Officer
Date:	February 19, 2015

EX-99.1

J-Devices Corporation

Consolidated Financial Statements

For the years ended December 31, 2014, 2013 and 2012

1

TABLE OF CONTENTS

	Page
Independent Auditor's Report	3
Consolidated Statements of Income — Years ended December 31, 2014, 2013 (unaudited) and 2012 (unaudited)	4
Consolidated Statements of Comprehensive Income — Years ended December 31, 2014, 2013 (unaudited) and 2012 (unaudited)	5
Consolidated Balance Sheets — December 31, 2014 and 2013 (unaudited)	6
Consolidated Statements of Stockholders’ Equity — Years ended December 31, 2014, 2013 (unaudited) and 2012 (unaudited)	7
Consolidated Statements of Cash Flows — Years ended December 31, 2014, 2013 (unaudited) and 2012 (unaudited)	8
Notes to Consolidated Financial Statements	9

2

Independent Auditor's Report

To the Board of Directors and Stockholders of J-Devices Corporation:

We have audited the accompanying consolidated financial statements of J-Devices Corporation and its subsidiaries, which comprise the consolidated balance sheet as of December 31, 2014, and the related consolidated statement of income, comprehensive income, stockholders' equity and cash flows for the year then ended.

Management's Responsibility for the Consolidated Financial Statements

Management is responsible for the preparation and fair presentation of the consolidated financial statements in accordance with accounting principles generally accepted in the United States of America; this includes the design, implementation, and maintenance of internal control relevant to the preparation and fair presentation of consolidated financial statements that are free from material misstatement, whether due to fraud or error.

Auditor's Responsibility

Our responsibility is to express an opinion on the consolidated financial statements based on our audit. We conducted our audit in accordance with auditing standards generally accepted in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free from material misstatement.

An audit involves performing procedures to obtain audit evidence about the amounts and disclosures in the consolidated financial statements. The procedures selected depend on our judgment, including the assessment of the risks of material misstatement of the consolidated financial statements, whether due to fraud or error. In making those risk assessments, we consider internal control relevant to the Company's preparation and fair presentation of the consolidated financial statements in order to design audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control. Accordingly, we express no such opinion. An audit also includes evaluating the appropriateness of accounting policies used and the reasonableness of significant accounting estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that the audit evidence we have obtained is sufficient and appropriate to provide a basis for our audit opinion.

Opinion

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of J-Devices Corporation and its subsidiaries at December 31, 2014, and the results of their operations and their cash flows for the year then ended in accordance with accounting principles generally accepted in the United States of America.

Other Matter

The accompanying consolidated balance sheet of J-Devices Corporation and its subsidiaries as of December 31, 2013, and the related consolidated statements of income, comprehensive income, stockholders' equity and cash flows for the years ended December 31, 2013 and 2012 were not audited, reviewed, or compiled by us and accordingly, we do not express an opinion or any other form of assurance on them.

/s/ PricewaterhouseCoopers Aarata

Tokyo, Japan

February 19, 2015

3

J-DEVICES CORPORATION

CONSOLIDATED STATEMETS OF INCOME

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Net sales	$	923,020		$	825,135		$	531,530
Cost of sales	799,778			741,357			470,527
Gross profit	123,242			83,778			61,003
Selling, general and administrative	50,605			51,306			20,332
Research and development	15,914			11,633			8,840
Total operating expenses	66,519			62,939			29,172
Operating income	56,723			20,839			31,831
Interest expense	2,549			3,481			2,992
Other income, net	(14,464		)	(3,339		)	(2,568		)
Total other (income) expense, net	(11,915		)	142			424
Income before taxes	68,638			20,697			31,407
Income tax expense	18,889			4,034			11,041
Net income	$	49,749		$	16,663		$	20,366

The accompanying notes are an integral part of these statements.

4

J-DEVICES CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Net income	$	49,749		$	16,663		$	20,366
Other comprehensive (loss) income, net of tax
Adjustments to unrealized components of defined benefit pension plans	(912		)	2,082			(517		)
Foreign currency translation adjustment	(30,569		)	(27,836		)	(12,401		)
Total other comprehensive loss	(31,481		)	(25,754		)	(12,918		)
Comprehensive income (loss)	$	18,268		$	(9,091	)	$	7,448

The accompanying notes are an integral part of these statements.

5

J-DEVICES CORPORATION

CONSOLIDATED BALANCE SHEETS

	December 31,
	2014			2013
				(unaudited)
	(In thousands, except share data)
ASSETS
Current assets:
Cash and cash equivalents	$	115,841		$	84,136
Accounts receivable	214,164			218,209
Inventories	33,053			36,372
Other current assets	18,340			13,911
Total current assets	381,398			352,628
Property, plant and equipment, net	197,393			228,941
Other assets	6,746			5,299
Total assets	$	585,537		$	586,868
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	35,652		$	52,565
Trade accounts payable	165,619			177,818
Capital expenditures payable	28,837			19,427
Accrued expenses	71,515			48,591
Total current liabilities	301,623			298,401
Long-term debt	44,940			78,710
Pension obligations	29,673			10,100
Other non-current liabilities	10,315			18,939
Total liabilities	386,551			406,150
Commitments and contingencies (Note 1)
Stockholders' Equity:
Common stock, no par value, 160,000 shares authorized, 64,445 shares issued and outstanding in 2014 and 2013	53,703			53,703
Additional paid-in capital	34,197			34,197
Retained earnings	168,015			118,266
Accumulated other comprehensive loss	(56,929		)	(25,448		)
Total stockholders' equity	198,986			180,718
Total liabilities and stockholders' equity	$	585,537		$	586,868

The accompanying notes are an integral part of these statements.

6

J-DEVICES CORPORATION

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

				Additional Paid- In Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)			Total Stockholders' Equity
	Common Stock
	Shares	Value
	(In thousands, except share data)
Balance at December 31, 2011 (unaudited)	36,826	$	19,506	$	—	$	81,237	$	13,224		$	113,967
Net income	—	—		—		20,366		—			20,366
Other comprehensive loss	—	—		—		—		(12,918		)	(12,918		)
Balance at December 31, 2012 (unaudited)	36,826	$	19,506	$	—	$	101,603	$	306		$	121,415
Net income	—	—		—		16,663		—			16,663
Other comprehensive loss	—	—		—		—		(25,754		)	(25,754		)
Issuance of stock	27,619	34,197		34,197		—		—			68,394
Balance at December 31, 2013 (unaudited)	64,445	$	53,703	$	34,197	$	118,266	$	(25,448	)	$	180,718
Net income	—	—		—		49,749		—			49,749
Other comprehensive loss	—	—		—		—		(31,481		)	(31,481		)
Balance at December 31, 2014	64,445	$	53,703	$	34,197	$	168,015	$	(56,929	)	$	198,986

The accompanying notes are an integral part of these statements.

7

J-DEVICES CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Cash flows from operating activities:
Net income	$	49,749		$	16,663		$	20,366
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	77,238			66,062			56,681
Amortization of deferred debt issuance costs and premiums	452			761			621
Deferred income taxes	112			(4,723		)	4,023
Gain from acquisition of business	(14,739		)	(2,724		)	(2,356		)
(Gain) loss on disposal of fixed assets, net	2,861			507			2,058
Other, net	622			1,743			980
Changes in assets and liabilities:
Accounts receivable	(19,627		)	(99,612		)	(14,721		)
Inventories	3,495			32,059			(429		)
Other current assets	149			7,115			(11,175		)
Other assets	(73		)	(1,394		)	(563		)
Trade accounts payable	4,943			112,219			2,543
Accrued expenses	16,995			22,022			(3,781		)
Pension obligations	7,501			5,715			2,973
Other non-current liabilities	(244		)	(3,315		)	(3,827		)
Net cash provided by operating activities	129,434			153,098			53,393
Cash flows from investing activities:
Payments for property, plant and equipment	(53,171		)	(33,666		)	(54,985		)
Proceeds from sale of property, plant and equipment	1,941			97			—
Acquisition of business, net of cash acquired	(3,425		)	(59,207		)	(38,161		)
Cash received on acquisition of business from Amkor, net of payments	15,777			—			—
Other investing activities	(11		)	(13		)	(15		)
Net cash used in investing activities	(38,889		)	(92,789		)	(93,161		)
Cash flows from financing activities:
Borrowings under short-term credit facilities	28,248			30,223			77,060
Payments under short-term credit facilities	(29,970		)	(54,323		)	(43,244		)
Proceeds from issuance of long-term debt	—			—			53,063
Payments of long-term debt	(36,705		)	(34,235		)	(20,604		)
Payments for debt issuance costs	—			—			(1,442		)
Payments of capital lease obligations	(1,794		)	(1,952		)	(1,863		)
Payments of capital lease obligations to Amkor	—			(8,843		)	(15,446		)
Proceeds from issuance of stock	—			68,394			—
Net cash (used in) provided by financing activities	(40,221		)	(736		)	47,524
Effect of exchange rate fluctuations on cash and cash equivalents	(18,619		)	(10,574		)	(2,746		)
Net increase in cash and cash equivalents	31,705			48,999			5,010
Cash and cash equivalents, beginning of period	84,136			35,137			30,127
Cash and cash equivalents, end of period	$	115,841		$	84,136		$	35,137
Supplemental disclosures of cash flow information:
Cash paid during the period for:
Interest	$	2,451		$	1,551		$	1,516
Income taxes	6,446			1,406			24,102
Non-cash investing activities:
Additions to property, plant and equipment included in capital expenditures payable	28,837			19,427			24,333
Equipment acquired through capital leases	2,161			798			1,289

The accompanying notes are an integral part of these statements.

8

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements

1. Description of Business and Summary of Significant Accounting Policies

Description of Business

In October 2009, Amkor Technology, Inc. ("Amkor") and Toshiba Corporation ("Toshiba") invested in Nakaya Microdevices Corporation (“NMD”), a semiconductor company with a history dating back to 1970, to form a joint venture in Japan. As a result of the transaction, NMD was owned 60% by the former shareholders of NMD, 30% by Amkor and 10% by Toshiba, and changed its name to J-Devices Corporation ("J-Devices"). In April 2013, Amkor completed the exercise of their option and purchased 27,619 new common shares for an aggregate purchase price of $68.4 million. The transaction increased Amkor's ownership interest to 60.0% and decreased the ownership interest of the former shareholders of NMD to 34.3% and Toshiba to 5.7%. In January 2015, Amkor purchased shares from Toshiba, which increased their ownership interest to 65.7%. Amkor has an option to increase their ownership interest up to 80% in 2015 and thereafter by purchasing shares owned by the other shareholders.

The governance provisions currently applicable to the joint venture restrict the ability of any individual investor, even with majority ownership, to cause us to take certain actions without the consent of the other investors. If Amkor exercises their 80% option, certain governance restrictions will lapse, and Amkor will obtain control.

J-Devices is the largest provider of outsourced semiconductor packaging and test services in Japan. Semiconductor manufacturing is broadly divided into wafer processing and packaging and test processing; wafer processing refers to the process of making wafers (semiconductor components). J-Devices' business solutions enable customers to outsource the packaging and test process via a turn-key solution; from wafer test through to packaging and all other evaluation test processes.

Basis of Presentation

Our Consolidated Financial Statements include the accounts of J-Devices Corporation and our subsidiaries (“J-Devices”). Our Consolidated Financial Statements reflect the elimination of all significant inter-company accounts and transactions. We completed the purchase of a legal entity consisting of three factories from Renesas Electronics Corporation ("Renesas") on June 1, 2013, and Amkor Iwate Company, Ltd. ("AIC") from Amkor on June 30, 2014. The financial results of the entities have been included in our Consolidated Financial Statements from the dates of acquisition (Note 3). As of December 31, 2014, AIC merged into J-Devices.

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ materially from those estimates and assumptions. We have evaluated subsequent events through February 19, 2015, which is the date the financial statements were issued. These financial statements have been prepared pursuant to Rule 3-09 of SEC Regulation S-X for inclusion in the Form 10-K of Amkor, as we are an equity-method investee of Amkor. Pursuant to Rule 3-09, only the financial statements as of and for the year ended December 31, 2014 have been audited and the financial statements for the years ended December 31, 2013 and 2012 are unaudited. Those unaudited financial statements include all adjustments of a normal recurring nature necessary to present fairly our results of operations, financial position and cash flows for the years presented.

Foreign Currency Translation

The Japanese yen is our functional currency and U.S. dollars is our reporting currency. Our asset and liability amounts are translated into U.S. dollars at end-of-period exchange rates. Income and expenses are translated into U.S. dollars at average exchange rates in effect during the period. The resulting translation adjustments are reported as a component of accumulated other comprehensive income in the stockholders’ equity section of the balance sheet. Assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency prior to translation into U.S. dollars, and the resulting transaction exchange gains or losses are included in other expense (income) in the period in which they occur.

9

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

Risks and Concentrations

The semiconductor industry is characterized by rapid technological change, competitive pricing pressures and cyclical market patterns. Our financial results are affected by a wide variety of factors, including general economic conditions worldwide, economic conditions specific to the semiconductor industry, the timely implementation of new package and test technologies, the ability to safeguard patents and intellectual property in a rapidly evolving market and reliance on materials and equipment suppliers. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns at various times. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

A significant portion of our revenues is concentrated with a small number of customers. The loss of a significant customer, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

Financial instruments, for which we are subject to credit risk, consist principally of accounts receivable and cash and cash equivalents. With respect to accounts receivable, we mitigate our credit risk by selling primarily to well established companies, performing ongoing credit evaluations and making frequent contact with customers. In addition, we may utilize non-recourse factoring to mitigate credit risk when considered appropriate. We have historically mitigated our credit risk with respect to cash through diversification of our holdings into various high quality bank deposit accounts.

Warranty

We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial.

Asset Retirement Obligations

We recognize a liability for the fair value of required asset retirement obligations ("ARO") when such obligations are incurred. Our AROs are primarily associated with leasehold improvements, which, at the end of a lease, we are contractually obligated to remove in order to comply with the lease agreement. At the inception of a lease with such conditions, we record a liability and a corresponding capital asset in an amount equal to the estimated fair value of the obligation. We estimate the liability using a number of assumptions, including cost inflation rates and discount rates, and accrete it to its projected future value over time. The capitalized asset is depreciated using the same depreciation convention as leasehold improvement assets. Upon satisfaction of the ARO conditions, any difference between the recorded liability and the actual retirement costs incurred is recognized as a gain or loss in the consolidated statements of income. Our net ARO liabilities included in other long-term liabilities as of December 31, 2014 and 2013, were $2.3 million and $0.8 million, respectively. The ARO assets have been fully depreciated as of December 31, 2014 and 2013.

Contingencies and Litigation

We may be subject to certain legal proceedings, lawsuits and other claims. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

10

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

Cash

Our cash consists of amounts invested in various bank operating accounts.

Inventories

Inventories are stated at the lower of cost or market (net realizable value). Cost is principally determined by a weighted moving average basis for raw materials and purchased components and on an average cost basis for work-in-process, both of which approximate actual cost. We reduce the carrying value of our inventories for the cost of inventory we estimate is excess and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Other Current Assets

Other current assets consist principally of deferred tax assets and prepaid expenses.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Buildings and improvements	2 to 50 years
Machinery and equipment	2 to 7 years
Software and computer equipment	2 to 6 years
Furniture, fixtures and other equipment	2 to 20 years

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts, and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

Other Assets

Other assets consist principally of deposits.

Other Non-current Liabilities

Other non-current liabilities consist primarily of liabilities associated with deferred tax liabilities, long-term portion of capital lease obligation and asset retirement obligations.

11

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

Fair Value Measurements

We apply fair value accounting for assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring or nonrecurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. See Note 13 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services, net of value-added or other similar taxes, when there is evidence of an arrangement, delivery has occurred or services have been rendered, fees are fixed or determinable and collectibility is reasonably assured. Generally these criteria are met and revenue is recognized upon customer acceptance.

We generally do not take ownership of customer-supplied semiconductor wafers. Title and risk of loss remains with the customer for these materials at all times. Accordingly, the cost of the customer-supplied materials is not included in our Consolidated Financial Statements.

Provisions are made for doubtful accounts when there is doubt as to the collectibility of accounts receivable. The allowance for doubtful accounts is recorded as bad debt expense and is classified as selling, general and administrative expense. The allowance for doubtful accounts is based upon specific identification of doubtful accounts considering the age of the receivable balance, the customer’s historical payment history and current credit worthiness as well as specific identification of any known or expected collectibility issues. Historically, our allowance for doubtful accounts has been immaterial.

Shipping and Handling Fees and Costs

Amounts billed to customers for shipping and handling are presented in net sales. Costs incurred for shipping and handling are included in cost of sales.

Research and Development Costs

Research and development expenses include costs attributable to the conduct of research and development programs primarily related to the development of new package designs and improving the efficiency and capabilities of our existing production processes. Such costs include salaries, payroll taxes, employee benefit costs, materials, supplies, depreciation and maintenance of research equipment, services provided by outside contractors and the allocable portions of facility costs such as rent, utilities, insurance, repairs and maintenance, depreciation and general support services. All costs associated with research and development are expensed as incurred.

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis as well as for net operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related tax benefits will not be realized.

In determining the amount of the valuation allowance, we consider all available evidence of realization, as well as feasible tax planning strategies. If all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if we conclude that we will ultimately be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a credit to income tax expense. We believe that it is more likely than not

12

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

that the tax benefits related to the deferred tax assets will be realized and do not have a valuation allowance. We monitor on an ongoing basis our ability to utilize our deferred tax assets and the need for a related valuation allowance.

We recognize in our Consolidated Financial Statements the impact of an income tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Related interest and penalties are classified as income taxes in the financial statements. See Note 5 for more information regarding unrecognized income tax benefits.

2. New Accounting Standards

Recently Issued Standards

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and changes in judgments. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and permits the use of either full retrospective or modified retrospective methods of adoption. Early adoption is not permitted. We are currently evaluating the method of adoption and the impact that this guidance will have on our financial statements and disclosure.

3.    Business Acquisitions

In June 2014, we completed the purchase of 100% of the shares of AIC, Amkor’s previously wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan, for ¥1.1 billion ($9.5 million). We paid ¥0.1 billion ($1.0 million) in cash at closing and will pay the remaining ¥1.0 billion ($8.5 million) by June 30, 2015. Under the purchase method of accounting, we allocated the purchase price to the assets acquired and liabilities assumed based on their estimated fair values on the date of acquisition and recognized a gain of $14.7 million (Note 4) as the fair value of the net assets acquired exceeded the purchase price. As part of the acquisition, we entered into an agreement by which Amkor shall continue to bill customers on behalf of AIC during the transition period. As of December 31, 2014, we received $5.4 million and have an outstanding receivable of $2.7 million.

In June 2013, we completed the purchase of a legal entity consisting of three back-end factories that were engaged in the semiconductor packaging and test operations in Japan from Renesas, and subsequently changed the name of the entity to J-Devices Semiconductor Corporation ("J-Semi"). The purpose of the acquisition is to improve our competitiveness in the market through establishing a mutually beneficial relationship with Renesas, one of Japan's largest electronics companies and one of the world's largest semiconductor companies. The total price paid for the shares was ¥12.6 billion ($124.1 million). We paid ¥4.8 billion ($47.5 million) in cash at closing, assumed a loan of ¥7.0 billion ($69.1 million) from Renesas and paid an additional ¥0.8 billion ($7.5 million) in cash as a price adjustment in August 2013.

The following table presents the allocation of the purchase price to the assets acquired and liabilities assumed based on their fair values on the date of acquisition:

	(In thousands)
Inventories	$	40,406
Property, plant and equipment, net	94,593
Other Assets	1,747
Total assets acquired	136,746
Current liabilities	(3,758		)
Non-current liabilities	(6,195		)
Total liabilities assumed	(9,953		)
Net assets acquired	$	126,793

13

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

As the fair value of the net assets acquired exceeded the purchase price, we recognized a gain of $2.7 million (Note 4). The gain is primarily due to the fact that Renesas was undertaking a restructuring of their business and motivated to outsource their packaging and test service to a specialized company like J-Devices to achieve better efficiency. As part of the acquisition, we entered into a five-year manufacturing services agreement with Renesas to provide semiconductor packaging and test services. Under the agreement, there is a take or pay arrangement subject to annual settlement for the first two years.

In December 2012, we completed the purchase of certain assets and the transfer of certain employees of three factories from Fujitsu Semiconductor Limited. The purchase price was ¥3.4 billion ($42.3 million), for which we paid ¥3.1 billion ($38.2 million) in cash at closing and ¥345.9 million ($4.1 million) in cash in January 2013. We allocated the purchase price to the assets acquired and liabilities assumed based on their estimated fair values on the date of acquisition and recognized a gain of $2.4 million (Note 4) as the fair value of the net assets acquired exceeded the purchase price. As part of the acquisition, we entered into a three-year outsourcing agreement to provide semiconductor packaging and test services.

4.    Other Income and Expense

Other income and expense consists of the following:

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Foreign currency loss (gain)	$	357		$	(415	)	$	(128	)
Gain from acquisition of business	(14,739		)	(2,724		)	(2,356		)
Other income, net	(82		)	(200		)	(84		)
Total other income, net	$	(14,464	)	$	(3,339	)	$	(2,568	)

5.    Income Taxes

The components of the provision (benefit) for income taxes are as follows:

	For the Year Ended December 31,
	2014		2013			2012
			(unaudited)			(unaudited)
	(In thousands)
Current	$	18,777	$	8,757		$	7,018
Deferred	112		(4,723		)	4,023
Total provision	$	18,889	$	4,034		$	11,041

The reconciliation between the Japan statutory income tax rate of approximately 36% (2014), 38% (2013) and 39% (2012) and our income tax provision is as follows:

14

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Japan statutory tax at 36% (2014), 38% (2013) and 39% (2012)	$	24,710		$	7,815		$	12,212
Income tax credits generated	(525		)	(3,411		)	(835		)
Bargain purchase gain	(5,215		)	(550		)	(924		)
Other	(81		)	180			588
Total	$	18,889		$	4,034		$	11,041

On November 30, 2011, Japan enacted a corporate tax rate reduction effective for the fiscal year starting on April 1, 2012 partially offset by a temporary earthquake damage restoration surtax, which expired for fiscal year starting April 1, 2014.

Research and development credits are available for a base level of qualified research and development expenditures and additional credits are available for incremental research and development expenditures over prior year levels subject to certain tax liability limitations.

The Japanese government provides special tax credit relief to support earthquake disaster district reconstruction. We were certified as a designated business operator by Murata-Cho in Miyagi prefecture in March 2013 and are allowed to claim tax credits for 10% of the salaries of affected employees limited to 20% of the national corporate income tax liability within five years from March 2013.

Income tax credits generated in 2014, 2013 and 2012 have been recognized in our income tax provision.

The gains from our recent business acquisitions (Note 3) are not taxable for Japanese tax purposes.

15

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

The following is a summary of the components of our deferred tax assets and liabilities:

	December 31,
	2014			2013
				(unaudited)
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	5,054		$	—
Accounts receivable	28			1,937
Income tax credits	328			2,114
Accrued liabilities	21,480			10,900
Property, plant and equipment	1,049			—
Other	210			138
Total deferred tax assets	28,149			15,089
Deferred tax liabilities:
Property, plant and equipment	10,949			17,238
Deferred gain	3,613			521
Other	357			1,225
Total deferred tax liabilities	14,919			18,984
Net deferred tax assets	$	13,230		$	(3,895	)
Recognized as:
Other current assets	$	15,219		$	10,835
Other assets	2,899			—
Other non-current liabilities	(4,888		)	(14,730		)
Total	$	13,230		$	(3,895	)

At December 31, 2014, we had net operating loss carryforwards ("NOL's") of $19.3 million which expire from 2017-2022. These NOL's were acquired as part of the AIC stock acquisition on June 30, 2014.

Our income tax returns are subject to examination by tax authorities. The tax years ended March 31, 2013 and 2012 have recently been examined without material adjustment. Our tax returns for the open years ended March 31, 2014 and after are subject to changes upon examination. Tax return examinations involve uncertainties and there can be no assurance that the outcome of examinations will be favorable.

We have not identified any uncertain tax positions for which we have unrecognized tax benefits as of December 31, 2014, 2013 or 2012.

6.     Factoring of Accounts Receivable

We utilize non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the year ended December 31, 2014 and 2013, we sold accounts receivable totaling $115.1 million and $297.9 million, respectively, for a discount, plus fees, of $0.08 million and $0.14 million, respectively.

16

7.     Inventories

Inventories consist of the following:

	December 31,
	2014		2013
			(unaudited)
	(In thousands)
Raw materials and purchased components	$	19,038	$	18,857
Work-in-process	14,015		17,515
Total inventories	$	33,053	$	36,372

8.     Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2014			2013
				(unaudited)
	(In thousands)
Land	$	23,760		$	27,349
Buildings and improvements	49,579			56,000
Machinery and equipment	342,644			350,628
Software and computer equipment	16,306			14,544
Furniture, fixtures and other equipment	39,769			36,023
Machinery and equipment under capital lease	6,264			6,637
Construction in progress	10,340			5,097
Total property, plant and equipment	488,662			496,278
Less accumulated depreciation and amortization	(291,269		)	(267,337		)
Total property, plant and equipment, net	$	197,393		$	228,941

Depreciation expense was $77.2 million, $66.1 million, and $56.7 million for 2014, 2013 and 2012, respectively.

9.     Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2014		2013
			(unaudited)
	(In thousands)
Payroll and benefits	$	36,918	$	33,474
Acquisition payable (Note 3)	8,485		—
Income taxes payable	11,322		1,406
Other accrued expenses	14,790		13,711
Total accrued expenses	$	71,515	$	48,591

17

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

10.     Debt

Following is a summary of short-term borrowings and long-term debt:

	December 31,
	2014			2013
				(unaudited)
	(In thousands)
Short-term credit facilities:
Variable rate (1)	$	7,848		$	9,318
Fixed rate (1)	4,144			6,180
Term loans:
Long-term prime lending rate linked to short-term prime lending rate less 1.275%, due 2015 (2)	690			5,547
TIBOR plus 1.0%, due 2015 (2)	1,025			8,312
TIBOR plus 1.0%, due 2016 (2)	6,112			10,815
TIBOR plus 1.2% due 2017 (3)	17,265			27,873
Fixed rate at 2.1%, due 2018 (4)	43,508			63,230
	80,592			131,275
Less: Short-term borrowings and current portion of long-term debt	(35,652		)	(52,565		)
Long-term debt	$	44,940		$	78,710

(1) We have ¥1.5 billion ($12.4 million) of short-term credit facilities which mature annually and semi-annually. The facilities have been renewed at each maturity. Principal is payable in monthly installments.

(2) In 2011, we entered into ¥7.0 billion ($58.0 million) of term loan agreements which are collateralized by substantially all the land and factories located at our facilities and a certain portion of accounts receivable. Principal is payable in monthly installments.

(3) In 2012, we entered into a ¥4.3 billion ($35.2 million) syndicated term loan agreement which is collateralized by the land, factories and equipment located at our facilities and a certain portion of accounts receivable. Principal is payable in quarterly installments.

(4) In 2013, we entered into a ¥7.0 billion ($58.0 million) term loan with Renesas in accordance with the Stock Transfer Agreement which is collateralized by substantially all the land, factories and equipment located at our facilities at J-Semi. Principal is payable in quarterly installments.

Interest Rates

Interest is payable monthly on the variable rate debt and monthly or quarterly on the fixed rate debt. Refer to the following table for the interest rates on our debt.

18

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

	Interest Rates at December 31,
	2014		2013
			(unaudited)
Short-term credit facilities:
Variable rate	0.53	%	0.55	%
Fixed rate	0.53	%	0.65	%
Term loan:
Long-term prime lending rate linked to short-term prime lending rate less 1.275%, due 2015	1.20	%	1.20	%
TIBOR plus 1.0%, due 2015	1.13	%	1.15	%
TIBOR plus 1.0%, due 2016	1.13	%	1.15	%
TIBOR plus 1.2%, due 2017	1.33	%	1.35	%
Fixed rate at 2.1%, due 2018	2.10	%	2.10	%

Compliance with Debt Covenants

Our loan agreements contain a number of affirmative and negative covenants which could restrict our operations and could result in acceleration of payment if there is a material adverse event. The loan agreement governing our syndicated term loan contains financial covenants that requires us to maintain certain levels of net assets and debt service coverage and net leverage ratios. We were in compliance with all our covenants as of December 31, 2014 and 2013.

Assets pledged as collateral

As of December 31, 2014 and 2013, the carrying value of the assets pledged as collateral for our syndicated term loan and term loans amounted to $119.2 million and $138.7 million, respectively.

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2015	$	35,652
2016	21,426
2017	14,813
2018	8,701
2019	—
Thereafter	—
Total debt	$	80,592

19

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

11.     Pension Plans

We sponsor defined benefit plans (the “Plans”) that cover all regular employees with at least one year of service. Charges to expense are based upon actuarial analyses.

The following table summarizes the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2014 and 2013.

	For the Year Ended December 31,
	2014			2013
				(unaudited)
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	17,189		$	13,781
Service cost	9,032			7,765
Interest cost	340			151
Benefits paid	(652		)	(327		)
Actuarial losses (gains)	2,312			(1,182		)
Acquisition (Note 3)	14,676			—
Foreign exchange gain	(5,290		)	(2,999		)
Projected benefit obligation at end of year	37,607			17,189
Change in plan assets:
Fair value of plan assets at beginning of year	9,405			6,873
Actual gain on plan assets	978			2,245
Employer contributions	3,100			2,030
Benefits paid	(653		)	(176		)
Foreign exchange loss	(1,619		)	(1,567		)
Fair value of plan assets at end of year	11,211			9,405
Funded status of the Plans at end of year	$	(26,396	)	$	(7,784	)

The accrued benefit liability, included in pension obligations in the Consolidated Balance Sheets, as of December 31, 2014 and 2013 was $26.4 million and $7.8 million, respectively. The accumulated benefit obligation as of December 31, 2014 and 2013 was $35.5 million and $16.1 million, respectively.

20

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes, by component, the change in accumulated other comprehensive income related to our Plans:

	Prior Service Cost			Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2012, net of tax (unaudited)	$	(379	)	$	(575	)	$	(954	)
Amortization included in net periodic pension cost	27			(34		)	(7		)
Net gain arising during period	—			2,089			2,089
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	27			2,055			2,082
Balance at December 31, 2013, net of tax (unaudited)	$	(352	)	$	1,480		$	1,128
Amortization included in net periodic pension cost	25			—			25
Net gain arising during period	—			(937		)	(937		)
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	25			(937		)	(912		)
Balance at December 31, 2014, net of tax	$	(327	)	$	543		$	216
Estimated amortization to be included in 2015 net periodic pension cost	$	(48	)	$	—		$	(48	)

Information for pension plans with benefit obligations in excess of plan assets are as follows:

	December 31,
	2014		2013
			(unaudited)
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	37,607	$	17,189
Aggregate fair value of plan assets	11,211		9,405
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	35,455		16,118
Aggregate fair value of plan assets	11,211		9,405

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2014			2013			2012
				(unaudited)			(unaudited)
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	9,032		$	7,765		$	5,174
Interest cost	340			151			134
Expected return on plan assets	(106		)	(151		)	(123		)
Amortization of prior service cost	(39		)	(43		)	(52		)
Recognized actuarial loss	—			53			43
Total pension expense	$	9,227		$	7,775		$	5,176

21

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligations at December 31, 2014, 2013 and 2012:

	For the Year Ended December 31,
	2014		2013		2012
			(unaudited)		(unaudited)
Discount rate for determining net periodic pension cost	1.5	%	1.5	%	1.5	%
Discount rate for determining benefit obligations at year end	1.0	%	1.5	%	1.3	%
Rate of compensation increase for determining benefit obligations at year end	0.6	%	—	%	—	%
Expected rate of return on plan assets for determining net periodic pension cost	1.5	%	1.0	%	2.0	%

The measurement date for determining the Plans’ assets and benefit obligations is December 31, each year. Discount rates are generally derived from yield curves constructed from high-quality corporate or foreign government bonds, for which the timing and amount of cash outflows approximate the estimated payouts.

The expected rate of return assumption is based on weighted-average expected returns for each asset class. Expected returns reflect a combination of historical performance analysis and the forward-looking views of the financial markets and include input from our actuaries. One of our defined benefit pension plans is a non-funded plan and as such, no assets exist related to this plan. Our investment strategy for our other defined benefit plan is based on long-term, sustained asset growth through low to medium risk investments. The current rate of return assumption targets are based on an asset allocation strategy for our plan assets of 57% debt securities, 41% equity securities and 2% others.

The fair value of our pension plan assets at December 31, 2014, by asset category utilizing the fair value hierarchy as discussed in Note 13, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Cash and cash equivalents	$	690	$	—	$	—	$	690
Equity securities
Domestic securities	2,188		—		—		2,188
Foreign securities	2,231		—		—		2,231
	4,419		—		—		4,419
Bonds
Domestic government and corporate bonds	—		5,014				5,014
Foreign government and corporate bonds	—		1,001		—		1,001
	—		6,015		—		6,015
Other	—		—		87		87
Total	$	5,109	$	6,015	$	87	$	11,211

22

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 13, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Cash and cash equivalents	$	2,269	$	—	$	—	$	2,269
Equity securities
Domestic securities	1,493		—		—		1,493
Foreign securities	1,373		—		—		1,373
	2,866		—		—		2,866
Bonds
Domestic government and corporate bonds	—		3,578		—		3,578
Foreign government and corporate bonds	—		609		—		609
	—		4,187		—		4,187
Other	—		—		83		83
Total	$	5,135	$	4,187	$	83	$	9,405

We contributed $3.1 million and $2.0 million to the Plans during 2014 and 2013, respectively, and we expect to contribute $2.8 million during 2015. We closely monitor the funded status of the Plans with respect to legislative requirements. We intend to make at least the minimum contribution required by law each year.

The estimated future benefit payments related to our foreign defined benefit plans are as follows:

	Payments
	(In thousands)
2015	$	708
2016	1,195
2017	1,556
2018	2,509
2019	3,195
2020 to 2024	26,170

23

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

12. Accumulated Other Comprehensive Income (Loss)

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:

	Defined Benefit Pension			Foreign Currency Translation			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2012 (unaudited)	$	(954	)	$	1,260		$	306
Other comprehensive income (loss) before reclassifications	2,089			(27,836		)	(25,747		)
Amounts reclassified from accumulated other comprehensive (loss) income	(7		)	—			(7		)
Other comprehensive income (loss)	2,082			(27,836		)	(25,754		)
Accumulated other comprehensive income (loss) at December 31, 2013 (unaudited)	$	1,128		$	(26,576	)	$	(25,448	)
Other comprehensive loss before reclassifications	(937		)	(30,569		)	(31,506		)
Amounts reclassified from accumulated other comprehensive income (loss)	25			—			25
Other comprehensive loss	(912		)	(30,569		)	(31,481		)
Accumulated other comprehensive income (loss) at December 31, 2014	$	216		$	(57,145	)	$	(56,929	)

Amounts reclassified out of accumulated other comprehensive (loss) income are included as a component of net periodic pension cost (Note 11).

13.     Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as 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, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable and the majority of other current assets, other assets, accrued expenses and other non current liabilities approximate carrying values because of their short-term nature. We also measure certain assets and liabilities, including property, plant and equipment, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of our debt:

24

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

	December 31, 2014				December 31, 2013
					(unaudited)
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Short-term credit facilities	$	11,994	$	11,992	$	15,500	$	15,498
Term loans	69,485		68,600		116,638		115,777
Total debt	$	81,479	$	80,592	$	132,138	$	131,275

The estimated fair value of our short-term credit facilities and term loans was based on a third-party valuation using an income approach which discounts the future interest and principal payments at the estimated fair market yield.

14.     Leases

Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year are:

	Lease Payments
	(In thousands)
2015	$	9,547
2016	5,886
2017	838
2018	336
2019	300
Thereafter	438
Total	$	17,345

Rent expense amounted to $19.0 million, $24.2 million and $27.0 million for 2014, 2013 and 2012, respectively.

The following is a summary of future minimum lease payments under capital leases together with the present value of the minimum lease payments at December 31, 2014:

	(In thousands)
2015	$	1,720
2016	1,518
2017	1,252
2018	241
2019	22
Thereafter	—
Total minimum lease payments	4,753
Less: amount of interest contained in above payments	(236		)
Present value of minimum lease payments	4,517
Less: current portion of capital lease obligation	(1,484		)
Long-term portion of capital lease obligation	$	3,033

In conjunction with the joint venture agreement, we leased packaging and test equipment from Amkor, which was accounted for as a direct financing lease. During 2012, we made lease payments of $15.4 million, which included imputed interest.

25

J-DEVICES CORPORATION

Notes to Consolidated Financial Statements — (Continued)

At the end of the lease in October 2012, we purchased the remaining equipment for $8.8 million, which was paid in January 2013.

15.     Related Party Transactions

Mr. Yoshifumi Nakaya, Representative Director and one of our major shareholders, provides guarantee, free of charge, for certain debt we borrowed from banks. The outstanding balance of those debts as of December 31, 2014 and 2013 was $36.0 million and $68.0 million, respectively.

26

XML

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2014

Payables and Accruals [Abstract]

Summarized Accrued expenses

Accrued expenses consist of the following:

	December 31,
	2014		2013
	(In thousands)
Payroll and benefits	$	77,635	$	75,909
Deferred revenue and customer advances	56,829		44,764
Accrued settlement costs (Note 18)	32,414		43,324
Income taxes payable	31,580		17,528
Accrued interest	15,947		21,807
Accrued severance plan obligations (Note 15)	13,226		11,197
Acquisition payable (Note 3)	—		17,897
Other accrued expenses	31,366		31,826
Total accrued expenses	$	258,997	$	264,252

XML

Share-Based Compensation Plans (Restricted Shares) (Details) (Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Shares Nonvested beginning balance	1,172
Number of Shares Awards granted	0
Number of Shares Awards vested	(479)
Number of Shares Awards forfeited	(33)
Number of Shares Nonvested ending balance	660
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant-Date Fair Value Nonvested beginning balance (in dollars per share)	$ 4.83
Weighted Average Grant-Date Fair Value Awards granted (in dollars per share)	$ 0.00
Weighted Average Grant-Date Fair Value Awards vested (in dollars per share)	$ 5.18
Weighted Average Grant-Date Fair Value Awards forfeited (in dollars per share)	$ 4.68
Weighted Average Grant-Date Fair Value Nonvested ending balance (in dollars per share)	$ 4.58

XML

Description of Business and Summary of Significant Accounting Policies (Other) (Details)	12 Months Ended
	Dec. 31, 2014
Land use rights [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	50 years
Land use rights [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	90 years
Building and Building Improvements [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	10 years
Building and Building Improvements [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	25 years
Machinery and Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	2 years
Machinery and Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	7 years
Software and Computer Equipment [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	3 years
Software and Computer Equipment [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	5 years
Furniture and Fixtures [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	4 years
Furniture and Fixtures [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average	10 years

XML

Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Apr. 30, 2013	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 117,733	$ 105,214
J Devices [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 117,733	$ 105,214
Equity Method Investment, Ownership Percentage	60.00%	60.00%	60.00%	30.00%

XML

Share-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3.7	$ 3.0	$ 2.7
Weighted Average Exercise Price Per Share average contractual term (years)	6 years 7 months 10 days
Contractual term	10 years
Restricted shares vesting percentage	25.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)				17,000,000
Number of shares available for grant (in shares)	11,400,000
Employee stock option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense from Restricted Stock	4.3
Weighted-average period of recognition of unrecognized compensation expense	2 years 6 months
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Unrecognized compensation expense from Restricted Stock	$ 2.6
Weighted-average period of recognition of unrecognized compensation expense	2 years 1 month 6 days
Vested in period (in shares)	479,000

XML

Pension and Severance Plans (Defined Contribution Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Cost Recognized	$ 6.8	$ 5.2	$ 4.1

XML

(Tables)

12 Months Ended

Dec. 31, 2014

Restructuring and Related Activities [Abstract]

Summary of reduction in force initiatives

The following table summarizes changes to the balance of our accrual associated with these efforts. “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	2014			2013
	(In thousands)
Beginning balance	$	—		$	1,607
Charges	3,889			10,506
Cash Payments	(3,973		)	(12,531		)
Non-cash Amounts	84			418
Ending balance	$	—		$	—

XML

Other Income and Expense (Tables)

12 Months Ended

Dec. 31, 2014

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

Other income and expense consists of the following:

	December 31,
	2014			2013			2012
	(In thousands)
Interest income	$	(3,359	)	$	(3,785	)	$	(3,160	)
Foreign currency (gain) loss, net	(9,808		)	(5,626		)	4,185
Loss on debt retirement	757			12,330			1,199
Gain on sale of subsidiary to J-Devices (Note 4)	(9,155		)	—			—
Other income, net	(2,978		)	(705		)	(1,586		)
Total other (income) expense, net	$	(24,543	)	$	2,214		$	638

XML

Pension and Severance Plans (Korean Severance Plan) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Non-current portion of severance obligation	$ 152,673	$ 165,073
Korean Severance Plan [Member]
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance	145,373	126,762	106,715
Provision of severance benefits	17,593	26,550	19,667
Severance payments	(10,160)	(10,402)	(8,520)
(Gain) loss on foreign currency	(5,926)	2,463	8,900
Balance	146,880	145,373	126,762
Payments remaining with the National Pension Fund	(219)	(241)	(249)
Korean Severance Plan [Member]
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Pension and Other Postretirement and Postemployment Benefit Plans, Liabilities	146,661	145,132	126,513
Less current portion of accrued severance obligation (Note 13)	13,226	11,197	9,516
Non-current portion of severance obligation	$ 133,435	$ 133,935	$ 116,997
Minimum [Member] | Korean Severance Plan [Member]
Restructuring Cost and Reserve [Line Items]
Accrued Severance Plan Minimum Service Period	1 year

XML

Debt (Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 1,525,000	$ 1,646,350
Debt Instrument, Unamortized Premium	5,824	6,390
Less: Short-term borrowings and current portion of long-term debt	(5,000)	(61,350)
Long-term debt (including related party)	1,525,824	1,591,390
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	0	0
7.375% Senior notes, due May 2018 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	345,000	345,000
6.625% Senior notes, due June 2021, $75 million related party | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	400,000	400,000
6.375% Senior notes, due October 2022 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	525,000	525,000
6.0% Convertible senior subordinated notes, due April 2014 (2) | Convertible Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	0	56,350
KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	0	0
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due June 2016 (4) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	70,000	70,000
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	80,000	0
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (6) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	30,000	90,000
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	5,000	10,000
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due December 2019 | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	70,000	70,000
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015 | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	0	80,000
TAIWAN, PROVINCE OF CHINA | Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 0	$ 0

XML

Commitments and Contingencies (Future minimum lease payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecorded Unconditional Purchase Obligation [Line Items]
2015	$ 13,116,000
2016	7,792,000
2017	6,336,000
2018	6,029,000
2019	6,194,000
Thereafter	12,624,000
Total	52,091,000
Operating Leases, Rent Expense, Net	$ 28,500,000	$ 23,800,000	$ 13,200,000

XML

Income Taxes (Components of income tax expense and income before taxes, by jurisdiction) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Geographic sources of income (loss) before income taxes
United States	$ 16,571	$ (36,829)	$ 17,062
Foreign	119,507	160,816	37,049
Total income before income taxes	136,078	123,987	54,111
Components of the provision (benefit) for income taxes
Current federal tax expense	0	0	0
Current state tax (benefit) expense	(46)	0	(75)
Current foreign tax expense	51,081	30,902	10,998
Current income tax expense	51,035	30,902	10,923
Deferred federal tax expense	0	(8,556)	1,859
Deferred state tax expense	0	9	266
Deferred foreign tax expense (benefit)	(17,190)	291	3,953
Deferred income tax expense (benefit)	(17,190)	(8,256)	6,078
Income tax expense	$ 33,845	$ 22,646	$ 17,001
Effective Income Tax Rate Reconciliation, Percent	24.90%	18.30%	31.40%

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Debt (Interest Rates) (Details) (KOREA, REPUBLIC OF, Subsidiary Term Loans [Member])	Dec. 31, 2014	Dec. 31, 2013
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due June 2016
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.96%	3.95%
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due July 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.93%	4.14%
London Interbank Offered Rate (LIBOR) [Member] | Term loan, LIBOR plus 3.70%, due December 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.93%	3.95%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.49%	0.00%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	3.28%	3.76%
Foreign Currency Funding-Linked Rate [Member] | Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	0.00%	4.29%

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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 1 [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Cash equivalent money market funds	$ 145,938	$ 300,352
Restricted cash money market funds	$ 2,681	$ 2,681

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Pension and Severance Plans (Changes and Components) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,042	$ 5,909
Interest cost	3,051	3,170
Recognized actuarial loss	3,514	(2,513)
Foreign Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5,042	5,909	6,362
Interest cost	3,051	3,170	3,270
Expected return on plan assets	(3,094)	(3,508)	(3,188)
Amortization of prior service cost	116	231	291
Recognized actuarial loss	(141)	(142)	(225)
Net periodic pension cost	5,256	5,944	6,960
Curtailment (gain) loss	0	(176)	1,089
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements	97	(120)	(100)
Total pension expense	$ 5,353	$ 5,648	$ 7,949

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Fair Value Measurements (Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 1,523,618	$ 1,744,028
Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,268,619	1,321,443
Convertible Subordinated Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	102,585
Subsidiary Term Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	254,999	320,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,530,824	1,652,740
Carrying Value [Member] | Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,275,824	1,276,390
Carrying Value [Member] | Convertible Subordinated Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	56,350
Carrying Value [Member] | Subsidiary Term Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 255,000	$ 320,000

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Debt (Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
2015	$ 5,000
2016	70,000
2017	110,000
2018	345,000
2019	70,000
Thereafter	925,000
Total debt	$ 1,525,000	$ 1,646,350

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Investments (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2013	Oct. 31, 2009	Jan. 31, 2015	Jun. 30, 2014	Mar. 31, 2013	Jan. 30, 2015
Schedule of Investments [Line Items]
Payments to Acquire Businesses and Interest in Affiliates	$ 0	$ 67,372,000	$ 0
J Devices [Member]
Schedule of Investments [Line Items]
Minimum ownership threshold, put option	80.00%
Ownership Interest	60.00%	60.00%		60.00%				30.00%
Payments to Acquire Businesses and Interest in Affiliates				67,400,000	16,700,000
Maximum ownership ratio of call options	80.00%
Retained Earnings, Undistributed Earnings from Equity Method Investees	63,500,000	31,800,000
J Devices [Member] | Subsequent Event [Member]
Schedule of Investments [Line Items]
Ownership Interest									65.70%
Payments to Acquire Businesses and Interest in Affiliates						$ 12,900,000
Former NMD Shareholders [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Ownership Interest	34.30%
Japanese Subsidiary [Member]
Schedule of Investments [Line Items]
Sale of Stock, Percentage of Ownership before Transaction							100.00%

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Fair Value Measurements

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

17. Fair Value Measurements

The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as 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, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data.

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of other non-current liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include cash equivalent money market funds and restricted cash money market funds. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets.

Our recurring fair value measurements consist of the following:

	December 31,
	2014		2013
	(In thousands)
Cash equivalent money market funds (Level 1)	$	145,938	$	300,352
Restricted cash money market funds (Level 1)	2,681		2,681

We also measure certain assets and liabilities, including property, plant and equipment and our investment in J-Devices, at fair value on a nonrecurring basis.

We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis:

	December 31, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,268,619	$	1,275,824	$	1,321,443	$	1,276,390
Convertible senior subordinated notes (Level 1)	—		—		102,585		56,350
Term loans (Level 2)	254,999		255,000		320,000		320,000
Total debt	$	1,523,618	$	1,530,824	$	1,744,028	$	1,652,740

The estimated fair value of our senior and convertible senior subordinated notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our term loans was calculated using a discounted cash flow analysis, which utilized market based assumptions including forward interest rates adjusted for credit risk.

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Sale of Subsidiary to J-Devices (Details)	12 Months Ended			3 Months Ended	1 Months Ended		3 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2014 J Devices [Member] USD ($)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] JPY (¥)	Jun. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)	Dec. 31, 2014 Amkor Iwate Company Ltd [Member] USD ($)	Dec. 31, 2014 Amkor Iwate Company Ltd [Member] JPY (¥)	Sep. 30, 2014 Amkor Iwate Company Ltd [Member] USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of Stock, Percentage of Ownership before Transaction					100.00%	100.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds						¥ 1,100,000,000				$ 9,600,000
Proceeds from Divestiture of Interest in Consolidated Subsidiaries					1,000,000	100,000,000
Proceeds to Be Received from Divestiture of Interest in Consolidated Subsidiaries								8,600,000	1,000,000,000
Gain (Loss) on Disposition of Business	9,155,000	0	0				9,200,000
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)							12,600,000
Business Combination, Bargain Purchase, Gain Recognized, Amount				14,700,000
Proportionate Share Of Investee Bargain Purchase Gain				8,800,000
Combined Net Gain from Sale of Subsidiary							$ 18,000,000

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Accumulated Other Comprehensive Income and Loss Accumulated Other Comprehensive Income and Loss (Tables)

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss) [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:

	Defined Benefit Pension			Foreign Currency Translation			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2012	$	(5,373	)	$	16,346		$	268		$	11,241
Other comprehensive income (loss) before reclassifications	3,996			(4,895		)	(10,961		)	(11,860		)
Amounts reclassified from accumulated other comprehensive (loss) income	364			—			—			364
Other comprehensive income (loss)	4,360			(4,895		)	(10,961		)	(11,496		)
Accumulated other comprehensive (loss) income at December 31, 2013	$	(1,013	)	$	11,451		$	(10,693	)	$	(255	)
Other comprehensive (loss) income before reclassifications	(1,724		)	623			(19,136		)	(20,237		)
Amounts reclassified from accumulated other comprehensive (loss) income	212			(12,587		)	—			(12,375		)
Other comprehensive loss	(1,512		)	(11,964		)	(19,136		)	(32,612		)
Accumulated other comprehensive loss at December 31, 2014	$	(2,525	)	$	(513	)	$	(29,829	)	$	(32,867	)

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Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			1 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2014	Jun. 30, 2013	Dec. 31, 2014	Jan. 31, 2012	Sep. 30, 2012	Apr. 30, 2009	Mar. 31, 2013	Mar. 31, 2014	Apr. 30, 2013	Sep. 30, 2014	Jun. 30, 2012
Debt Instruments [Abstract]
Payments of Debt Exchange Costs	$ 0	$ 11,619,000	$ 0
Letter of Credit [Member]
Debt Instruments [Abstract]
Credit facility, borrowing capacity	25,000,000					25,000,000
Convertible Subordinated Debt [Member] | 6.0% Convertible senior subordinated notes, due April 2014 (2)
Debt Instruments [Abstract]
Debt Instrument, Face Amount									250,000,000
Interest rate	6.00%					6.00%			6.00%
Debt Instrument, Convertible, Conversion Price									$ 3.02
Debt Conversion, Converted Instrument, Shares Issued				18.6	64.0
Payments of Debt Exchange Costs					11,600,000
Common stock issuance for conversion of related party 6.25% convertible subordinated notes				56,400,000	193,700,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)
Debt Instruments [Abstract]
Credit facility, borrowing capacity										150,000,000
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt Instrument, Periodic Payment, Principal						5,000,000
Line of Credit Facility, Current Borrowing Capacity	140,000,000					140,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (6)
Debt Instruments [Abstract]
Debt Instrument, Basis Spread on Variable Rate	3.70%
Interest rate	3.70%					3.70%
Debt Instrument Term	5 years
Repayments of Debt				60,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5)
Debt Instruments [Abstract]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Debt Instrument, Unused Borrowing Capacity, Amount											80,000,000
Interest rate	1.80%					1.80%
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due June 2016 (4)
Debt Instruments [Abstract]
Credit facility, borrowing capacity												150,000,000
Debt Instrument, Basis Spread on Variable Rate	3.70%
Line of Credit Facility, Current Borrowing Capacity	80,000,000					80,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instruments [Abstract]
Credit facility, borrowing capacity	200,000,000					200,000,000							150,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum						1.25%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum						1.75%
Line of Credit Facility, Borrowing Capacity, Description	borrowing base for the revolving credit facility is based on the amount of our eligible accounts receivable, which exceeded $200.0 million
Line of Credit [Member] | Revolving Credit Facility [Member] | KOREA, REPUBLIC OF
Debt Instruments [Abstract]
Debt Instrument Term							12 months
Line of Credit [Member] | Revolving Credit Facility [Member] | KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3)
Debt Instruments [Abstract]
Credit facility, borrowing capacity	41,000,000					41,000,000								41,000,000
Debt Instrument, Basis Spread on Variable Rate	2.00%
Line of Credit Facility, Current Borrowing Capacity	41,000,000					41,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | TAIWAN, PROVINCE OF CHINA | Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8)
Debt Instruments [Abstract]
Credit facility, borrowing capacity	44,000,000					44,000,000
Line of Credit Facility, Current Borrowing Capacity	19,000,000					19,000,000
Step down provision	$ 5,000,000					$ 5,000,000
Line of Credit Facility, Step Down Provision, Step Down Period								6 months
Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instruments [Abstract]
Debt Instrument, Basis Spread on Variable Rate						0.00%
Interest rate	1.25%					1.25%
Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instruments [Abstract]
Debt Instrument, Basis Spread on Variable Rate						0.50%
Interest rate	1.75%					1.75%

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Summary of Property, plant and equipment

Property, plant and equipment consist of the following:

	December 31,
	2014			2013
	(In thousands)
Land	$	207,985		$	208,048
Land use rights	26,845			26,845
Buildings and improvements	940,846			911,258
Machinery and equipment	3,953,891			3,577,045
Software and computer equipment	185,243			193,641
Furniture, fixtures and other equipment	15,347			17,430
Construction in progress	39,261			27,039
Total property, plant and equipment	5,369,418			4,961,306
Less accumulated depreciation and amortization	(3,162,942		)	(2,954,753		)
Total property, plant and equipment, net	$	2,206,476		$	2,006,553

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Share-Based Compensation Plans (Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares Outstanding beginning balance	4,873
Number of Shares Granted	330
Number of Shares Exercised	(1,011)
Number of Shares Forfeited or expired	(370)
Number of Shares Outstanding ending balance	3,822
Number of Shares Fully vested and expected to vest	3,798
Number of Shares Exercisable	2,113
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price Per Share Outstanding beginning balance (in dollars per share)	$ 6.52
Weighted Average Exercise Price Per Share Granted (in dollars per share)	$ 8.15
Weighted Average Exercise Price Per Share Exercised (in dollars per share)	$ 6.18
Weighted Average Exercise Price Per Share Forfeited or expired (in dollars per share)	$ 11.71
Weighted Average Exercise Price Per Share Outstanding ending balance (in dollars per share)	$ 6.25
Weighted Average Exercise Price Per Share Fully vested and expected to vest (in dollars per share)	$ 6.26
Weighted Average Exercise Price Per Share Exercisable (in dollars per share)	$ 7.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Exercise Price Per Share average contractual term (years)	6 years 7 months 10 days
Average Remaining Contractual Term Fully vested and expected to vest (years)	6 years 7 months 2 days
Average Remaining Contractual Term Exercisable (years)	4 years 11 months 5 days
Aggregate intrinsic value Outstanding ending balance (in dollars)	$ 6,376
Aggregate intrinsic value Fully vested and expected to vest (in dollars)	6,325
Aggregate intrinsic value Exercisable (in dollars)	$ 2,454

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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories
Raw materials and purchased components	$ 161,942	$ 147,292
Work-in-process	61,437	53,131
Total inventories	$ 223,379	$ 200,423

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Income Taxes (Net operating loss carryforwards) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Loss Carryforwards and other details [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 721,700,000
United States [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	317,841,000	342,770,000
State Income Taxes [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	173,756,000	197,618,000
Non-U.S. [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards	4,962,000	38,337,000
Repatriation Of Earnings Estimated Tax Impact	21,500,000
U.S. [Member]
Loss Carryforwards and other details [Abstract]
Tax Credit Carryforward, Amount	8,100,000
KOREA, REPUBLIC OF
Loss Carryforwards and other details [Abstract]
Tax Credit Carryforward, Amount	$ 11,100,000
Minimum [Member] | United States [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2021
Minimum [Member] | State Income Taxes [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2014
Minimum [Member] | Non-U.S. [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2014
Maximum [Member] | United States [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2033
Maximum [Member] | State Income Taxes [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2031
Maximum [Member] | Non-U.S. [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards, expiration dates	Dec. 31, 2022

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Description of Business and Summary of Significant Accounting Policies (Variable Interest Entity) (Details) (Variable Interest Entity, Primary Beneficiary [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Ownership Percentage	40.00%
Carrying Amount, Assets and Liabilities	$ 16.8	$ 0.2

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Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Summary of Significant Accounting Policies

1. Description of Business and Summary of Significant Accounting Policies

Description of Business

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Amkor pioneered the outsourcing of semiconductor packaging and test services through a predecessor corporation in 1968, and over the years we have built a leading position by:

• Designing and developing innovative packaging and test technologies;

• Offering a broad portfolio of cost-effective solutions and services;

• Successfully penetrating strategic end markets which offer solid growth prospects;

• Cultivating long-standing relationships with our customers, which include many of the world’s leading semiconductor companies;

• Collaborating with customers, original equipment manufacturers ("OEMs") and equipment and material suppliers;

• Developing a competitive cost structure with disciplined capital investment;

• Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution and

• Having a diversified operational scope with research and development, engineering and production capabilities at various facilities throughout China, Japan, Korea, Malaysia, the Philippines and Taiwan.

Basis of Presentation

Our Consolidated Financial Statements include the accounts of Amkor Technology, Inc. and our subsidiaries (“Amkor”). Our Consolidated Financial Statements reflect the elimination of all significant inter-company accounts and transactions. On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. The financial results of the entity have been included in our Consolidated Financial Statements from the date of acquisition (Note 3). On June 30, 2014, we completed the sale of our Japanese subsidiary to J-Devices, our equity-method joint venture in Japan. The financial results of the divested entity were included in our consolidated financial statements up to the date of sale (Note 4) and have subsequently been included in the results of J-Devices. Our investments in variable interest entities in which we are the primary beneficiary are consolidated. We reflect the remaining portion of variable interest entities and foreign subsidiaries that are not wholly owned as noncontrolling interests.

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, income taxes, inventory, long lived assets and contingencies. These estimates are based on management’s best knowledge of current events, historical experience, actions that we may undertake in the future and on various other assumptions that are believed to be reasonable under the circumstances. As a result, actual results could differ materially from these estimates and assumptions.

Consolidation of Variable Interest Entities

We have variable interests in certain Philippine realty corporations in which we have a 40% ownership and from whom we lease land and buildings in the Philippines, for which we are the primary beneficiary. As of December 31, 2014, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.8 million and $0.2 million, respectively. The impact of consolidating these variable interest entities on our Consolidated Statements of Income was not significant, and other than our lease payments, we have not provided any significant assistance or other financial support to these variable interest entities for the years ended December 31, 2014, 2013 or 2012. The creditors of the Philippine realty corporations have no recourse to our general credit.

Foreign Currency Translation

The U.S. dollar is the functional currency of our subsidiaries and the foreign currency asset and liability amounts at these subsidiaries are remeasured into U.S. dollars at end-of-period exchange rates, except for nonmonetary items which are remeasured at historical rates. Foreign currency income and expenses are remeasured at daily exchange rates, except for expenses related to balance sheet amounts which are remeasured at historical exchange rates. Exchange gains and losses arising from remeasurement of foreign currency-denominated monetary assets and liabilities are included in other expense (income) in the period in which they occur.

The local currency is the functional currency of our equity-method investee, J-Devices. The asset and liability amounts of J-Devices are translated into U.S. dollars at end-of-period exchange rates. Income and expenses are translated into U.S. dollars at average exchange rates in effect during the period. The resulting translation adjustments are reported as a component of accumulated other comprehensive income in the stockholders’ equity section of the balance sheet. Assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency prior to translation into U.S. dollars, and the resulting transaction exchange gains or losses are included in other expense (income) in the period in which they occur.

Risks and Concentrations

The semiconductor industry is characterized by rapid technological change, competitive pricing pressures and cyclical market patterns. Our financial results are affected by a wide variety of factors, including general economic conditions worldwide, economic conditions specific to the semiconductor industry, the timely implementation of new package and test technologies, the ability to safeguard patents and intellectual property in a rapidly evolving market and reliance on materials and equipment suppliers. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns at various times. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

A significant portion of our revenues is concentrated with a small group of customers (refer to Note 19). The loss of a significant customer, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

Financial instruments, for which we are subject to credit risk, consist principally of accounts receivable and cash and cash equivalents. With respect to accounts receivable, we mitigate our credit risk by selling primarily to well established companies, performing ongoing credit evaluations and making frequent contact with customers. In addition, we may utilize non-recourse factoring to mitigate credit risk when considered appropriate. We have historically mitigated our credit risk with respect to cash and cash equivalents through diversification of our holdings into various high quality money market funds and bank deposit accounts. At December 31, 2014, our cash and cash equivalents were invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Contingencies and Litigation

We may be subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 18. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Cash and Cash Equivalents

We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents consist of amounts invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Restricted Cash

Restricted cash, current, consists of short-term cash equivalents used to collateralize our daily banking services. Restricted cash, non-current, mainly consists of collateral to fulfill foreign trade compliance requirements.

Inventories

Inventories are stated at the lower of cost or market (net realizable value). Cost is principally determined by standard cost (on a first-in, first-out basis for raw materials and purchased components and an average cost basis for work-in-process) or by the weighted moving average method (for commodities and spare parts), both of which approximate actual cost. We review and set our standards as needed, but at a minimum on an annual basis. We reduce the carrying value of our inventories for the cost of inventory we estimate is excess and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Other Current Assets

Other current assets consist principally of prepaid assets, deferred tax assets and an investment in government securities by a foreign subsidiary to satisfy local regulatory requirements, which is recorded at amortized cost.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Land use rights	50 to 90 years
Buildings and improvements	10 to 25 years
Machinery and equipment	2 to 7 years
Software and computer equipment	3 to 5 years
Furniture, fixtures and other equipment	4 to 10 years

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts, and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

Investments

Our investment in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan, is accounted for as an equity method investment. We evaluate our investment for other-than-temporary impairment whenever events or changes in circumstances indicate that the fair value of the investment may be less than its carrying value. See Note 12 for additional information.

Other Assets

Other assets consist principally of deferred tax assets, deferred debt issuance costs and refundable security deposits.

Other Non-current Liabilities

Other non-current liabilities consist primarily of liabilities associated with the settlement of patent license litigation and uncertain income tax positions. See Note 18 for additional information on the settlement.

Treasury Stock

Treasury stock is recognized when outstanding shares are repurchased or otherwise acquired by us, including when outstanding shares are withheld to satisfy tax withholding obligations in connection with certain restricted share awards under our equity incentive plans. The repurchased and withheld shares are accounted for as treasury stock at cost.

Fair Value Measurements

We apply fair value accounting for assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring or nonrecurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. See Note 17 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services, net of value-added or other similar taxes, when there is evidence of an arrangement, delivery has occurred or services have been rendered, fees are fixed or determinable and collectibility is reasonably assured. Generally these criteria are met and revenue is recognized upon shipment. If the revenue recognition criteria are not met, we defer the revenue. Deferred revenue generally results from two types of transactions: contractual invoicing at interim points in the packaging and test process prior to shipment of the finished product and customer advances for supply agreements with customers where we commit capacity in exchange for customer prepayment of services. These prepayments are deferred and recorded as customer advances within accrued expenses and other non-current liabilities.

We generally do not take ownership of customer-supplied semiconductor wafers. Title and risk of loss remains with the customer for these materials at all times. Accordingly, the cost of the customer-supplied materials is not included in our Consolidated Financial Statements.

An allowance for sales credits is recorded as a reduction to sales and accounts receivable during the period of sale such that accounts receivable is reported at its estimated net realizable value. The allowance for sales credits is an estimate of the future credits we will issue for billing adjustments primarily for invoicing corrections and miscellaneous customer claims and is estimated based upon recent credit issuance, historical experience and specific identification of known or expected sales credits at the end of the reporting period. Additionally, provisions are made for doubtful accounts when there is doubt as to the collectibility of accounts receivable. The allowance for doubtful accounts is recorded as bad debt expense and is classified as selling, general and administrative expense. The allowance for doubtful accounts is based upon specific identification of doubtful accounts considering the age of the receivable balance, the customer’s historical payment history and current credit worthiness as well as specific identification of any known or expected collectibility issues. Historically, our allowance for doubtful accounts has been immaterial.

Shipping and Handling Fees and Costs

Amounts billed to customers for shipping and handling are presented in net sales. Costs incurred for shipping and handling are included in cost of sales.

Research and Development Costs

Research and development expenses include costs attributable to the conduct of research and development programs primarily related to the development of new package designs or technologies and improving the efficiency and capabilities of our existing production processes. Such costs include salaries, payroll taxes, employee benefit costs, materials, supplies, depreciation and maintenance of research equipment, services provided by outside contractors and the allocable portions of facility costs such as rent, utilities, insurance, repairs and maintenance, depreciation and general support services. All costs associated with research and development are expensed as incurred.

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis as well as for net operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related tax benefits will not be realized.

In determining the amount of the valuation allowance, we consider all available evidence of realization, as well as feasible tax planning strategies, in each taxing jurisdiction. If all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if we conclude that we will ultimately be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a credit to income tax expense. We monitor on an ongoing basis our ability to utilize our deferred tax assets and the continuing need for a related valuation allowance.

We recognize in our Consolidated Financial Statements the impact of an income tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Related interest and penalties are classified as income taxes in the financial statements. See Note 7 for more information regarding unrecognized income tax benefits.

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Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 27,128,000	$ 8,218,000	$ 7,930,000
Additions based on tax positions related to the current year	6,032,000	17,752,000	5,551,000
Additions for tax positions of prior years	1,240,000	2,723,000	54,000
Reductions for tax positions of prior years	(15,433,000)	(108,000)	(4,091,000)
Reductions related to settlements with tax authorities	6,297,000	1,353,000	1,226,000
Reductions from lapse of statutes of limitations	0	(104,000)	0
Balance, end of period	12,670,000	27,128,000	8,218,000
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	14,500,000
Liability for uncertain tax positions	10,500,000
Tax Deductions [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	15,400,000
Settlement with Taxing Authority [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	5,100,000
Contested Prior Year Deductions In Foreign Jurisdictions [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	6,000,000
Scenario, Forecast [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Reductions from lapse of statutes of limitations				$ (600,000)

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets

Our recurring fair value measurements consist of the following:

	December 31,
	2014		2013
	(In thousands)
Cash equivalent money market funds (Level 1)	$	145,938	$	300,352
Restricted cash money market funds (Level 1)	2,681		2,681

Financial instruments that are not recorded at fair value

The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis:

	December 31, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,268,619	$	1,275,824	$	1,321,443	$	1,276,390
Convertible senior subordinated notes (Level 1)	—		—		102,585		56,350
Term loans (Level 2)	254,999		255,000		320,000		320,000
Total debt	$	1,523,618	$	1,530,824	$	1,744,028	$	1,652,740

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

	Balance at Beginning of Period		Additions (Credited) Charged to Expense		Write-offs		(a) Other		Balance at End of Period
	(In thousands)
Deferred tax asset valuation allowance:
Year ended December 31, 2012	$	214,269	(1,626	)	(1,486	)	(1,400	)	$	209,757
Year ended December 31, 2013	209,757		(16,860	)	(15,555	)	1,841		179,183
Year ended December 31, 2014	179,183		(10,838	)	(2,534	)	(15,964	)	149,847

(a) Column represents adjustments to the deferred tax asset valuation allowance directly through stockholders’ equity for changes in accumulated other comprehensive income (loss) related to our foreign defined benefit pension plans and the sale of a subsidiary in 2014.

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Reductions in Force

12 Months Ended

Dec. 31, 2014

Restructuring and Related Activities [Abstract]

Reduction in Force

20. Reductions in Force

As part of our ongoing efforts to improve our manufacturing operations and manage costs, we regularly evaluate our staffing levels and facility requirements compared to business needs. The following table summarizes changes to the balance of our accrual associated with these efforts. “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	2014			2013
	(In thousands)
Beginning balance	$	—		$	1,607
Charges	3,889			10,506
Cash Payments	(3,973		)	(12,531		)
Non-cash Amounts	84			418
Ending balance	$	—		$	—

During the years ended December 31, 2014, 2013 and 2012, we reduced our workforce through workforce reduction programs. We recorded $3.9 million, $10.5 million and $11.2 million in charges in 2014, 2013 and 2012, respectively. All charges related primarily to cost of sales, except for $3.9 million of charges in 2012, related to selling, general and administrative expenses.

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Other Income and Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Interest income	$ (3,359)	$ (3,785)	$ (3,160)
Foreign currency (gain) loss, net	(9,808)	(5,626)	4,185
Gains (Losses) on Extinguishment of Debt Including Prepayment Penalties	(757)	(12,330)	(1,199)
Gain on sale of subsidiary to J-Devices (Note 4)	9,155	0	0
Other income, net	(2,978)	(705)	(1,586)
Total other (income) expense, net	$ (24,543)	$ 2,214	$ 638

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year are:

	Lease Payments
	(In thousands)
2015	$	13,116
2016	7,792
2017	6,336
2018	6,029
2019	6,194
Thereafter	12,624
Total	$	52,091

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Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations [Text Block]

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Amkor pioneered the outsourcing of semiconductor packaging and test services through a predecessor corporation in 1968, and over the years we have built a leading position by:

• Designing and developing innovative packaging and test technologies;

• Offering a broad portfolio of cost-effective solutions and services;

• Successfully penetrating strategic end markets which offer solid growth prospects;

• Cultivating long-standing relationships with our customers, which include many of the world’s leading semiconductor companies;

• Collaborating with customers, original equipment manufacturers ("OEMs") and equipment and material suppliers;

• Developing a competitive cost structure with disciplined capital investment;

• Building expertise in high-volume manufacturing processes and developing a reputation for high quality and solid execution and

• Having a diversified operational scope with research and development, engineering and production capabilities at various facilities throughout China, Japan, Korea, Malaysia, the Philippines and Taiwan.

Basis of Presentation

Our Consolidated Financial Statements include the accounts of Amkor Technology, Inc. and our subsidiaries (“Amkor”). Our Consolidated Financial Statements reflect the elimination of all significant inter-company accounts and transactions. On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd. The financial results of the entity have been included in our Consolidated Financial Statements from the date of acquisition (Note 3). On June 30, 2014, we completed the sale of our Japanese subsidiary to J-Devices, our equity-method joint venture in Japan. The financial results of the divested entity were included in our consolidated financial statements up to the date of sale (Note 4) and have subsequently been included in the results of J-Devices. Our investments in variable interest entities in which we are the primary beneficiary are consolidated. We reflect the remaining portion of variable interest entities and foreign subsidiaries that are not wholly owned as noncontrolling interests.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, income taxes, inventory, long lived assets and contingencies. These estimates are based on management’s best knowledge of current events, historical experience, actions that we may undertake in the future and on various other assumptions that are believed to be reasonable under the circumstances. As a result, actual results could differ materially from these estimates and assumptions.

Consolidation of Variable Interest Entities

We have variable interests in certain Philippine realty corporations in which we have a 40% ownership and from whom we lease land and buildings in the Philippines, for which we are the primary beneficiary. As of December 31, 2014, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.8 million and $0.2 million, respectively. The impact of consolidating these variable interest entities on our Consolidated Statements of Income was not significant, and other than our lease payments, we have not provided any significant assistance or other financial support to these variable interest entities for the years ended December 31, 2014, 2013 or 2012. The creditors of the Philippine realty corporations have no recourse to our general credit.

Foreign Currency Translation

The U.S. dollar is the functional currency of our subsidiaries and the foreign currency asset and liability amounts at these subsidiaries are remeasured into U.S. dollars at end-of-period exchange rates, except for nonmonetary items which are remeasured at historical rates. Foreign currency income and expenses are remeasured at daily exchange rates, except for expenses related to balance sheet amounts which are remeasured at historical exchange rates. Exchange gains and losses arising from remeasurement of foreign currency-denominated monetary assets and liabilities are included in other expense (income) in the period in which they occur.

The local currency is the functional currency of our equity-method investee, J-Devices. The asset and liability amounts of J-Devices are translated into U.S. dollars at end-of-period exchange rates. Income and expenses are translated into U.S. dollars at average exchange rates in effect during the period. The resulting translation adjustments are reported as a component of accumulated other comprehensive income in the stockholders’ equity section of the balance sheet. Assets and liabilities denominated in a currency other than the functional currency are remeasured into the functional currency prior to translation into U.S. dollars, and the resulting transaction exchange gains or losses are included in other expense (income) in the period in which they occur.

Concentration Risk Disclosure [Text Block]

The semiconductor industry is characterized by rapid technological change, competitive pricing pressures and cyclical market patterns. Our financial results are affected by a wide variety of factors, including general economic conditions worldwide, economic conditions specific to the semiconductor industry, the timely implementation of new package and test technologies, the ability to safeguard patents and intellectual property in a rapidly evolving market and reliance on materials and equipment suppliers. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns at various times. Our profitability and ability to generate cash from operations is principally dependent upon demand for semiconductors, the utilization of our capacity, semiconductor package mix, the average selling price of our services, our ability to manage our capital expenditures and our ability to control our costs including labor, material, overhead and financing costs.

A significant portion of our revenues is concentrated with a small group of customers (refer to Note 19). The loss of a significant customer, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

Financial instruments, for which we are subject to credit risk, consist principally of accounts receivable and cash and cash equivalents. With respect to accounts receivable, we mitigate our credit risk by selling primarily to well established companies, performing ongoing credit evaluations and making frequent contact with customers. In addition, we may utilize non-recourse factoring to mitigate credit risk when considered appropriate. We have historically mitigated our credit risk with respect to cash and cash equivalents through diversification of our holdings into various high quality money market funds and bank deposit accounts. At December 31, 2014, our cash and cash equivalents were invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Risks and Uncertainties

We may be subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 18. We accrue for a loss contingency, including legal proceedings, lawsuits, pending claims and other legal matters, when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. When the reasonable estimate of the loss is within a range of amounts, and no amount in the range constitutes a better estimate than any other amount, we accrue for the amount at the low end of the range. We adjust our accruals from time to time as we receive additional information, but the loss we incur may be significantly greater than or less than the amount we have accrued. We disclose loss contingencies if there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Cash and Cash Equivalents

We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents consist of amounts invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts.

Restricted Cash

Restricted cash, current, consists of short-term cash equivalents used to collateralize our daily banking services. Restricted cash, non-current, mainly consists of collateral to fulfill foreign trade compliance requirements.

Inventories

Inventories are stated at the lower of cost or market (net realizable value). Cost is principally determined by standard cost (on a first-in, first-out basis for raw materials and purchased components and an average cost basis for work-in-process) or by the weighted moving average method (for commodities and spare parts), both of which approximate actual cost. We review and set our standards as needed, but at a minimum on an annual basis. We reduce the carrying value of our inventories for the cost of inventory we estimate is excess and obsolete based on the age of our inventories. When a determination is made that the inventory will not be utilized in production or is not saleable, it is written-off.

Other Current Assets [Text Block]

Other current assets consist principally of prepaid assets, deferred tax assets and an investment in government securities by a foreign subsidiary to satisfy local regulatory requirements, which is recorded at amortized cost.

Property, Plant and Equipment

Property, plant and equipment are stated at cost. Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Land use rights	50 to 90 years
Buildings and improvements	10 to 25 years
Machinery and equipment	2 to 7 years
Software and computer equipment	3 to 5 years
Furniture, fixtures and other equipment	4 to 10 years

Cost and accumulated depreciation for property retired or disposed of are removed from the accounts, and any resulting gain or loss is included in earnings. Expenditures for maintenance and repairs are charged to expense as incurred.

We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Recoverability of a long-lived asset group to be held and used in operations is measured by a comparison of the carrying amount to the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset group. If such asset group is considered to be impaired, the impairment loss is measured as the amount by which the carrying amount of the asset group exceeds its fair value. Long-lived assets to be disposed of are carried at the lower of cost or fair value less the costs of disposal.

Investments

Our investment in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan, is accounted for as an equity method investment. We evaluate our investment for other-than-temporary impairment whenever events or changes in circumstances indicate that the fair value of the investment may be less than its carrying value

Schedule of Other Assets, Noncurrent [Table Text Block]

Other assets consist principally of deferred tax assets, deferred debt issuance costs and refundable security deposits.

Other Noncurrent Liabilities [Table Text Block]

Other non-current liabilities consist primarily of liabilities associated with the settlement of patent license litigation and uncertain income tax positions. See Note 18 for additional information on the settlement.

Treasury Stock

Treasury stock is recognized when outstanding shares are repurchased or otherwise acquired by us, including when outstanding shares are withheld to satisfy tax withholding obligations in connection with certain restricted share awards under our equity incentive plans. The repurchased and withheld shares are accounted for as treasury stock at cost.

Fair Value Measurements

We apply fair value accounting for assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring or nonrecurring basis. We define fair value as the price that would be received from selling an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. See Note 17 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services, net of value-added or other similar taxes, when there is evidence of an arrangement, delivery has occurred or services have been rendered, fees are fixed or determinable and collectibility is reasonably assured. Generally these criteria are met and revenue is recognized upon shipment. If the revenue recognition criteria are not met, we defer the revenue. Deferred revenue generally results from two types of transactions: contractual invoicing at interim points in the packaging and test process prior to shipment of the finished product and customer advances for supply agreements with customers where we commit capacity in exchange for customer prepayment of services. These prepayments are deferred and recorded as customer advances within accrued expenses and other non-current liabilities.

We generally do not take ownership of customer-supplied semiconductor wafers. Title and risk of loss remains with the customer for these materials at all times. Accordingly, the cost of the customer-supplied materials is not included in our Consolidated Financial Statements.

An allowance for sales credits is recorded as a reduction to sales and accounts receivable during the period of sale such that accounts receivable is reported at its estimated net realizable value. The allowance for sales credits is an estimate of the future credits we will issue for billing adjustments primarily for invoicing corrections and miscellaneous customer claims and is estimated based upon recent credit issuance, historical experience and specific identification of known or expected sales credits at the end of the reporting period. Additionally, provisions are made for doubtful accounts when there is doubt as to the collectibility of accounts receivable. The allowance for doubtful accounts is recorded as bad debt expense and is classified as selling, general and administrative expense. The allowance for doubtful accounts is based upon specific identification of doubtful accounts considering the age of the receivable balance, the customer’s historical payment history and current credit worthiness as well as specific identification of any known or expected collectibility issues. Historically, our allowance for doubtful accounts has been immaterial.

Shipping and Handling Fees and Costs

Amounts billed to customers for shipping and handling are presented in net sales. Costs incurred for shipping and handling are included in cost of sales

Research and Development Costs

Research and development expenses include costs attributable to the conduct of research and development programs primarily related to the development of new package designs or technologies and improving the efficiency and capabilities of our existing production processes. Such costs include salaries, payroll taxes, employee benefit costs, materials, supplies, depreciation and maintenance of research equipment, services provided by outside contractors and the allocable portions of facility costs such as rent, utilities, insurance, repairs and maintenance, depreciation and general support services. All costs associated with research and development are expensed as incurred

Income Taxes

Income taxes are accounted for using the asset and liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis as well as for net operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance is provided for those deferred tax assets for which it is more likely than not that the related tax benefits will not be realized.

In determining the amount of the valuation allowance, we consider all available evidence of realization, as well as feasible tax planning strategies, in each taxing jurisdiction. If all or a portion of the remaining deferred tax assets will not be realized, the valuation allowance will be increased with a charge to income tax expense. Conversely, if we conclude that we will ultimately be able to utilize all or a portion of the deferred tax assets for which a valuation allowance has been provided, the related portion of the valuation allowance will be released to income as a credit to income tax expense. We monitor on an ongoing basis our ability to utilize our deferred tax assets and the continuing need for a related valuation allowance.

We recognize in our Consolidated Financial Statements the impact of an income tax position, if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Related interest and penalties are classified as income taxes in the financial statements. See Note 7 for more information regarding unrecognized income tax benefits.

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Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Property Plant and Equipment Policy

Depreciation is calculated by the straight-line method over the estimated useful lives of depreciable assets which are as follows:

Land use rights	50 to 90 years
Buildings and improvements	10 to 25 years
Machinery and equipment	2 to 7 years
Software and computer equipment	3 to 5 years
Furniture, fixtures and other equipment	4 to 10 years

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Non cash investing and financing activities:
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013	$ 56,350	$ 193,650
6.0% Convertible senior subordinated notes, due April 2014 (2)
Non cash investing and financing activities:
Interest rate of convertible subordinated notes	6.00%	6.00%
Related Party [Member] | 6.0% Convertible senior subordinated notes, due April 2014 (2)
Non cash investing and financing activities:
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013	$ 0	$ 0

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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of all common stock option activity

The following table summarizes our stock option activity for the year ended December 31, 2014:

	Number of Shares (In thousands)	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2013	4,873	$	6.52
Granted	330	8.15
Exercised	(1,011)	6.18
Forfeited or expired	(370)	11.71
Outstanding at December 31, 2014	3,822	$	6.25	6.61	$	6,376
Fully vested at December 31, 2014 and expected to vest thereafter	3,798	$	6.26	6.59	$	6,325
Exercisable at December 31, 2014	2,113	$	7.17	4.93	$	2,454

Assumptions used in valuing the weighted average fair values of the options granted

The following assumptions were used to calculate the weighted average fair values of the options granted:

	For the Year Ended December 31,
	2014			2013			2012
Expected life (in years)	6.1			6.2			6.0
Risk-free interest rate	2.0		%	1.7		%	1.0		%
Volatility	57		%	60		%	65		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	4.46		$	2.49		$	2.68

Restricted share activity

The following table summarizes our restricted share activity for the year ended December 31, 2014:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2013	1,172		$	4.83
Awards granted	—		—
Awards vested	(479	)	5.18
Awards forfeited	(33	)	4.68
Nonvested at December 31, 2014	660		$	4.58

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Pension and Severance Plans (Defined Benefit Plans - Allocation of plan assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 54,771	$ 50,304	$ 58,146
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,742	4,542
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,825	20,173
Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,035	1,950
US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,790	18,223
US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,321	4,186
US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,840	2,087
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,996	12,461
Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,156	10,374
Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,632	8,840
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	255	102
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	51,676	48,115
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,742	4,542
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22,825	20,173
Fair Value, Inputs, Level 1 [Member] | Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,035	1,950
Fair Value, Inputs, Level 1 [Member] | US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,790	18,223
Fair Value, Inputs, Level 1 [Member] | US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,321	4,186
Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,156	10,374
Fair Value, Inputs, Level 1 [Member] | Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,156	10,374
Fair Value, Inputs, Level 1 [Member] | Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,632	8,840
Fair Value, Inputs, Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,095	2,189
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,840	2,087
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,840	2,087
Fair Value, Inputs, Level 2 [Member] | Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 255	$ 102

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Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Summary of Short term Borrowings And Long term Debt

Following is a summary of short-term borrowings and long-term debt:

	December 31,
	2014			2013
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)	$	—		$	—
Senior notes:
7.375% Senior notes, due May 2018	345,000			345,000
6.625% Senior notes, due June 2021, $75 million related party	400,000			400,000
6.375% Senior notes, due October 2022	525,000			525,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes, due April 2014 (2)	—			56,350
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3)	—			—
Term loan, LIBOR plus 3.70%, due June 2016 (4)	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5)	80,000			—
Term loan, LIBOR plus 3.70%, due July 2017 (6)	30,000			90,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	5,000			10,000
Term loan, LIBOR plus 3.70%, due December 2019	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—			80,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8)	—			—
	1,525,000			1,646,350
Add: Unamortized premium	5,824			6,390
Less: Short-term borrowings and current portion of long-term debt	(5,000		)	(61,350		)
Long-term debt (including related party)	$	1,525,824		$	1,591,390

(1) In December 2014, we amended the senior secured revolving credit facility to increase the facility amount from $150.0 million to $200.0 million and extend its term to December 2019. The facility has a letter of credit sub-limit of $25.0 million. As amended, interest is charged under the facility at a floating rate based on the base rate in effect from time to time plus the applicable margins, which range from 0.00% to 0.50% for base rate revolving loans, or LIBOR plus 1.25% to 1.75% for LIBOR revolving loans. The borrowing base for the revolving credit facility is based on the amount of our eligible accounts receivable, which exceeded $200.0 million as of December 31, 2014.

(2) In April 2009, we issued $250.0 million of our 6.0% Convertible senior subordinated notes (the “2014 Notes”). The 2014 Notes were convertible at any time prior to the maturity date into our common stock at a price of approximately $3.02 per share, subject to adjustment. In June 2013, we completed a tender offer for the 2014 Notes and exchanged $193.7 million of the 2014 Notes for an aggregate 64.0 million shares of our common stock and a cash payment of $11.6 million. In April 2014, holders of the 2014 Notes converted the remaining outstanding principal amount of $56.4 million into 18.6 million shares of our common stock.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. The loan is collateralized with substantially all the land, factories and equipment at our facilities in Korea. In June 2013, the facility was amended by extending the term by three years to June 2016. Principal is payable upon maturity. As of December 31, 2014, $41.0 million was available to be borrowed for general working capital purposes.

(4) In April 2013, we entered into a term loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016 for general working capital purposes and the repayment of inter-company debt. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. As of December 31, 2014, $80.0 million was available to be borrowed.

(5) In March 2014, we entered into a term loan agreement with a Korean bank pursuant to which we borrowed $80.0 million. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. Proceeds were used to prepay our term loan due March 2015. In January 2015, the term loan was amended and now bears interest at 1.80%.

(6) In June 2012, we entered into a term loan agreement for five years with a Korean bank collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In April 2014, we prepaid $60.0 million of the outstanding balance of the term loan. In October 2014, the term loan was amended and now bears interest at LIBOR plus 3.70%.

(7) In March 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through September 2017. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable in quarterly installments of $5.0 million starting in December 2014, with the remaining balance due at maturity. At December 31, 2014, $140.0 million was available to be borrowed for capital expenditures.

(8) In September 2012, Amkor Technology Taiwan Ltd, a subsidiary in Taiwan, entered into a revolving credit facility. Availability under the revolving credit facility was originally $44.0 million and subsequent availability steps down $5.0 million every six months from the original available balance. Principal is payable at maturity. As of December 31, 2014, $19.0 million was available to be drawn for general corporate purposes and capital expenditures.

Schedule of Interest Rates

Refer to the table above for the interest rates on our fixed rate debt and to the table below for the interest rates on our variable rate debt.

	Variable Interest Rates at December 31,
	2014		2013
Amkor Technology Korea, Inc.:
Term loan, LIBOR plus 3.70%, due June 2016	3.96	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017	3.49	%	—	%
Term loan, LIBOR plus 3.70%, due July 2017	3.93	%	4.14	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.28	%	3.76	%
Term loan, LIBOR plus 3.70%, due December 2019	3.93	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—	%	4.29	%

Schedule of Maturities of Long-term Debt

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2015	$	5,000
2016	70,000
2017	110,000
2018	345,000
2019	70,000
Thereafter	925,000
Total debt	$	1,525,000

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Share-Based Compensation Plans (Weighted Average Fair Value) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected life (in years)	6 years 1 month 6 days	6 years 2 months 12 days	6 years
Risk-free interest rate	2.00%	1.70%	1.00%
Volatility	57.00%	60.00%	65.00%
Dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value per option granted (in dollars per share)	$ 4.46	$ 2.49	$ 2.68

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Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Payroll and benefits	$ 77,635	$ 75,909
Deferred revenue and customer advances	56,829	44,764
Accrued settlement costs	32,414	43,324
Income taxes payable	31,580	17,528
Accrued interest	15,947	21,807
Accrued severance plan obligations (Note 15)	13,226	11,197
Acquisition payable (Note 3)	0	17,897
Other accrued expenses	31,366	31,826
Total accrued expenses	$ 258,997	$ 264,252

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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 3,129,440	$ 2,956,450	$ 2,759,546
Cost of sales	2,576,618	2,411,937	2,335,736
Gross profit	552,822	544,513	423,810
Selling, general and administrative	254,498	247,779	217,000
Research and development	76,864	64,625	54,118
Total operating expenses	331,362	312,404	271,118
Operating income	221,460	232,109	152,692
Interest expense	104,956	96,739	83,974
Interest expense, related party	4,969	9,169	13,969
Other (income) expense, net	24,543	(2,214)	(638)
Total other expense, net	(85,382)	(108,122)	(98,581)
Income before taxes and equity in earnings of unconsolidated affiliate	136,078	123,987	54,111
Income tax expense	33,845	22,646	17,001
Income before equity in earnings of unconsolidated affiliate	102,233	101,341	37,110
Equity in earnings of J-Devices	(31,654)	(10,316)	(5,592)
Net income	133,887	111,657	42,702
Net income attributable to noncontrolling interests	(3,501)	(2,361)	(884)
Net income attributable to Amkor	$ 130,386	$ 109,296	$ 41,818
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.56	$ 0.58	$ 0.26
Diluted (in dollars per share)	$ 0.55	$ 0.50	$ 0.24
Shares used in computing per common share amounts:
Basic (in shares)	230,710	187,032	160,105
Diluted (in shares)	236,731	235,330	243,004

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Business Segments (Tables)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Segment Reporting [Abstract]

Revenue from External Customers by Products and Services [Table Text Block]

The following table presents net sales by product group:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
Advanced products	$	1,552,948	$	1,451,664	$	1,302,145
Mainstream products	1,576,492		1,504,786		1,457,401
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

Net sales by country, and property, plant and equipment by physical location

The following table presents net sales by country based on customer location:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
China	$	270,282	$	47,202	$	28,641
Ireland	175,095		97,180		110,529
Japan	268,420		394,834		349,360
Singapore	432,942		496,601		452,737
Taiwan	212,719		144,825		99,047
Thailand	104,608		116,376		139,134
Other foreign countries	533,951		454,218		437,148
Total foreign countries	1,998,017		1,751,236		1,616,596
United States	1,131,423		1,205,214		1,142,950
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

The following table presents property, plant and equipment, net, based on the physical location of the asset:

	Property, Plant and Equipment, Net at December 31,
	2014		2013
	(In thousands)
China	$	575,207	$	524,967
Japan	145		10,799
Korea	948,192		916,777
Malaysia	50,137		61,080
Philippines	301,291		240,187
Taiwan	317,192		236,178
Other foreign countries	293		93
Total foreign countries	2,192,457		1,990,081
United States	14,019		16,472
Total property, plant and equipment, net	$	2,206,476	$	2,006,553

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Consolidated Statement of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Total Amkor Stockholders' Equity [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Noncontrolling Interest in Subsidiaries [Member]
Balance at beginning of period at Dec. 31, 2011	$ 701,221	$ 693,266	$ 197	$ 1,611,242	$ (798,462)	$ 10,849	$ (130,560)	$ 7,955
Balance at beginning of period, shares at Dec. 31, 2011			197,359
Treasury Stock, Shares							(45,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,702
Net Income (Loss) Attributable to Parent	41,818	41,818	0		41,818		0
Net Income (Loss) Attributable to Noncontrolling Interest	(884)							884
Other comprehensive income	392	392				392
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								0
Repurchase of common stock	(79,814)	(79,814)					(79,814)
Repurchase of common stock, number of shares							(16,472)
Treasury stock acquired through surrender of shares for tax withholding	(609)	(609)					(609)
Treasury stock acquired through surrender of shares for tax withholding, shares							(109)
Issuance of stock through share-based compensation plans	(182)	(182)	(1)	(181)
Issuance of stock through share-based compensation plans, shares			350
Share-based compensation expense	(2,720)	(2,720)		(2,720)
Balance at end of period at Dec. 31, 2012	666,794	657,955	198	1,614,143	(756,644)	11,241	(210,983)	8,839
Balance at end of period, shares at Dec. 31, 2012			197,709
Treasury Stock, Shares	(45,407)						(45,407)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	111,657
Net Income (Loss) Attributable to Parent	109,296	109,296	0		109,296		0
Net Income (Loss) Attributable to Noncontrolling Interest	(2,361)							2,361
Other comprehensive income	(11,496)	(11,496)				(11,496)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								0
Conversion of debt to common stock	195,034	195,034	64	194,970
Conversion of debt to common stock, shares			64,027				0
Treasury stock acquired through surrender of shares for tax withholding	(466)	(466)					(466)
Treasury stock acquired through surrender of shares for tax withholding, shares							(95)
Issuance of stock through share-based compensation plans	(446)	(446)		(446)
Issuance of stock through share-based compensation plans, shares			373
Share-based compensation expense	(2,971)	(2,971)		(2,971)
Balance at end of period at Dec. 31, 2013	964,940	953,740	262	1,812,530	(647,348)	(255)	(211,449)	11,200
Balance at end of period, shares at Dec. 31, 2013	262,109		262,109
Treasury Stock, Shares	(45,604)						(45,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	133,887
Net Income (Loss) Attributable to Parent	130,386	130,386	0	0	130,386		0
Net Income (Loss) Attributable to Noncontrolling Interest	(3,501)							3,501
Other comprehensive income	(32,612)	(32,612)				(32,612)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								0
Conversion of debt to common stock	56,350	56,350	19	56,331
Conversion of debt to common stock, shares			18,632				0
Treasury stock acquired through surrender of shares for tax withholding	(1,579)	(1,579)					(1,579)
Treasury stock acquired through surrender of shares for tax withholding, shares							(197)
Issuance of stock through share-based compensation plans	(6,250)	(6,250)	(1)	(6,249)
Issuance of stock through share-based compensation plans, shares			1,490
Share-based compensation expense	(3,700)	(3,700)
Balance at end of period at Dec. 31, 2014	$ 1,130,936	$ 1,116,235	$ 282	$ 1,878,810	$ (516,962)	$ (32,867)	$ (213,028)	$ 14,701
Balance at end of period, shares at Dec. 31, 2014	282,231		282,231

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Income Taxes (Components of deferred tax assets and liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforwards	$ 120,639,000	$ 147,905,000
Income tax credits	24,754,000	27,751,000
Property, plant and equipment	19,796,000	14,390,000
Accrued liabilities	76,682,000	57,374,000
Unrealized foreign exchange loss	4,947,000	3,893,000
Other	12,963,000	15,137,000
Total deferred tax assets	259,781,000	266,450,000
Valuation allowance	(149,847,000)	(179,183,000)
Total deferred tax assets net of valuation allowance	109,934,000	87,267,000
Property, plant and equipment	27,921,000	21,716,000
Deferred gain	5,036,000	6,295,000
Other	2,844,000	1,967,000
Total deferred tax liabilities	35,801,000	29,978,000
Net deferred tax assets	74,133,000	57,289,000
Other current assets	21,864,000	10,729,000
Other assets	54,950,000	47,609,000
Accrued expenses	(1,092,000)	(97,000)
Other non-current liabilities	(1,589,000)	(952,000)
Valuation Allowance, Deferred Tax Asset, Change in Amount	29,300,000	30,600,000	4,500,000
Valuation Allowance Share Based Compensation [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation allowance	$ (6,900,000)

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

The following table summarizes the computation of basic and diluted EPS:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands, except per share data)
Net income attributable to Amkor	$	130,386		$	109,296		$	41,818
Income allocated to participating securities	(372		)	(681		)	(212		)
Net income available to Amkor common stockholders — basic	130,014			108,615			41,606
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	6			93			212
Interest on 6.0% convertible notes due 2014, net of tax	1,039			9,440			16,103
Net income attributable to Amkor — diluted	$	131,059		$	118,148		$	57,921
Weighted average shares outstanding — basic	230,710			187,032			160,105
Effect of dilutive securities:
Stock options and restricted share awards	712			21			241
6.0% convertible notes due 2014	5,309			48,277			82,658
Weighted average shares outstanding — diluted	236,731			235,330			243,004
Net income attributable to Amkor per common share:
Basic	$	0.56		$	0.58		$	0.26
Diluted	0.55			0.50			0.24

Antidilutive effect of potential shares of common stock that were excluded from diluted earnings per share

The following table summarizes the potential shares of common stock that were excluded from diluted EPS, because the effect of including these potential shares was antidilutive:

	For the Year Ended December 31,
	2014	2013	2012
	(In thousands)
Stock options and restricted share awards	1,303	4,890	4,416

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Earnings Per Share (Antidilutive) (Details) (Stock Options And Restricted Shares [Member]) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options And Restricted Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive shares	1,303	4,890	4,416

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Debt

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Debt

14. Debt

Following is a summary of short-term borrowings and long-term debt:

	December 31,
	2014			2013
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)	$	—		$	—
Senior notes:
7.375% Senior notes, due May 2018	345,000			345,000
6.625% Senior notes, due June 2021, $75 million related party	400,000			400,000
6.375% Senior notes, due October 2022	525,000			525,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes, due April 2014 (2)	—			56,350
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3)	—			—
Term loan, LIBOR plus 3.70%, due June 2016 (4)	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5)	80,000			—
Term loan, LIBOR plus 3.70%, due July 2017 (6)	30,000			90,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	5,000			10,000
Term loan, LIBOR plus 3.70%, due December 2019	70,000			70,000
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—			80,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8)	—			—
	1,525,000			1,646,350
Add: Unamortized premium	5,824			6,390
Less: Short-term borrowings and current portion of long-term debt	(5,000		)	(61,350		)
Long-term debt (including related party)	$	1,525,824		$	1,591,390

(1) In December 2014, we amended the senior secured revolving credit facility to increase the facility amount from $150.0 million to $200.0 million and extend its term to December 2019. The facility has a letter of credit sub-limit of $25.0 million. As amended, interest is charged under the facility at a floating rate based on the base rate in effect from time to time plus the applicable margins, which range from 0.00% to 0.50% for base rate revolving loans, or LIBOR plus 1.25% to 1.75% for LIBOR revolving loans. The borrowing base for the revolving credit facility is based on the amount of our eligible accounts receivable, which exceeded $200.0 million as of December 31, 2014.

(2) In April 2009, we issued $250.0 million of our 6.0% Convertible senior subordinated notes (the “2014 Notes”). The 2014 Notes were convertible at any time prior to the maturity date into our common stock at a price of approximately $3.02 per share, subject to adjustment. In June 2013, we completed a tender offer for the 2014 Notes and exchanged $193.7 million of the 2014 Notes for an aggregate 64.0 million shares of our common stock and a cash payment of $11.6 million. In April 2014, holders of the 2014 Notes converted the remaining outstanding principal amount of $56.4 million into 18.6 million shares of our common stock.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. The loan is collateralized with substantially all the land, factories and equipment at our facilities in Korea. In June 2013, the facility was amended by extending the term by three years to June 2016. Principal is payable upon maturity. As of December 31, 2014, $41.0 million was available to be borrowed for general working capital purposes.

(4) In April 2013, we entered into a term loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016 for general working capital purposes and the repayment of inter-company debt. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. As of December 31, 2014, $80.0 million was available to be borrowed.

(5) In March 2014, we entered into a term loan agreement with a Korean bank pursuant to which we borrowed $80.0 million. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. Proceeds were used to prepay our term loan due March 2015. In January 2015, the term loan was amended and now bears interest at 1.80%.

(6) In June 2012, we entered into a term loan agreement for five years with a Korean bank collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In April 2014, we prepaid $60.0 million of the outstanding balance of the term loan. In October 2014, the term loan was amended and now bears interest at LIBOR plus 3.70%.

(7) In March 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through September 2017. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable in quarterly installments of $5.0 million starting in December 2014, with the remaining balance due at maturity. At December 31, 2014, $140.0 million was available to be borrowed for capital expenditures.

(8) In September 2012, Amkor Technology Taiwan Ltd, a subsidiary in Taiwan, entered into a revolving credit facility. Availability under the revolving credit facility was originally $44.0 million and subsequent availability steps down $5.0 million every six months from the original available balance. Principal is payable at maturity. As of December 31, 2014, $19.0 million was available to be drawn for general corporate purposes and capital expenditures.

Interest Rates

Interest is payable semiannually on our senior notes and interest is payable semi-annually, quarterly or monthly on our variable rate debt. Refer to the table above for the interest rates on our fixed rate debt and to the table below for the interest rates on our variable rate debt.

	Variable Interest Rates at December 31,
	2014		2013
Amkor Technology Korea, Inc.:
Term loan, LIBOR plus 3.70%, due June 2016	3.96	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017	3.49	%	—	%
Term loan, LIBOR plus 3.70%, due July 2017	3.93	%	4.14	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.28	%	3.76	%
Term loan, LIBOR plus 3.70%, due December 2019	3.93	%	3.95	%
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	—	%	4.29	%

Compliance with Debt Covenants

The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. The agreements governing our indebtedness contain a number of affirmative and negative covenants which restrict our ability to pay dividends and could restrict our operations. We have never paid a dividend to our stockholders and we do not have any present plans for doing so. We were in compliance with all of our covenants as of December 31, 2014 and 2013.

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2015	$	5,000
2016	70,000
2017	110,000
2018	345,000
2019	70,000
Thereafter	925,000
Total debt	$	1,525,000

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Inventories (Tables)

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:

	December 31,
	2014		2013
	(In thousands)
Raw materials and purchased components	$	161,942	$	147,292
Work-in-process	61,437		53,131
Total inventories	$	223,379	$	200,423

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Accumulated Other Comprehensive Income and Loss Accumulated Other Comprehensive Income and Loss

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive Income (Loss) Note [Text Block]

16. Accumulated Other Comprehensive Income (Loss)

The following table reflects the changes in accumulated other comprehensive income (loss), net of tax:

	Defined Benefit Pension			Foreign Currency Translation			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2012	$	(5,373	)	$	16,346		$	268		$	11,241
Other comprehensive income (loss) before reclassifications	3,996			(4,895		)	(10,961		)	(11,860		)
Amounts reclassified from accumulated other comprehensive (loss) income	364			—			—			364
Other comprehensive income (loss)	4,360			(4,895		)	(10,961		)	(11,496		)
Accumulated other comprehensive (loss) income at December 31, 2013	$	(1,013	)	$	11,451		$	(10,693	)	$	(255	)
Other comprehensive (loss) income before reclassifications	(1,724		)	623			(19,136		)	(20,237		)
Amounts reclassified from accumulated other comprehensive (loss) income	212			(12,587		)	—			(12,375		)
Other comprehensive loss	(1,512		)	(11,964		)	(19,136		)	(32,612		)
Accumulated other comprehensive loss at December 31, 2014	$	(2,525	)	$	(513	)	$	(29,829	)	$	(32,867	)

Amounts reclassified out of accumulated other comprehensive (loss) income are included as a component of net periodic pension cost (Note 15) or other (income) expense, net as a result of the release of accumulated foreign currency translation adjustments associated with the sale of our subsidiary in Japan (Note 4).

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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,369,418	$ 4,961,306
Less accumulated depreciation and amortization	(3,162,942)	(2,954,753)
Total property, plant and equipment, net	2,206,476	2,006,553
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	207,985	208,048
Land use rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,845	26,845
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	940,846	911,258
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,953,891	3,577,045
Software and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	185,243	193,641
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,347	17,430
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,261	$ 27,039

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 133,887	$ 111,657	$ 42,702
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	464,706	410,346	370,479
Amortization of deferred debt issuance costs and premiums	2,237	2,880	3,663
Deferred income taxes	(17,190)	(8,256)	6,078
Equity in earnings of unconsolidated affiliate	(31,654)	(10,316)	(5,592)
Loss on debt retirement	0	11,619	737
(Gain) loss on disposal of fixed assets, net	1,276	(2,545)	(1,676)
Share-based compensation	3,700	2,971	2,720
Gain on sale of subsidiary to J-Devices	(9,155)	0	0
Other, net	869	(712)	(1,279)
Changes in assets and liabilities:
Accounts receivable	(80,775)	(531)	(97,677)
Inventories	(27,817)	38,248	(29,882)
Other current assets	(8,747)	10,873	(5,015)
Other assets	(954)	3,709	598
Trade accounts payable	55,693	(67,198)	17,142
Accrued expenses	16,720	32,001	66,566
Other non-current liabilities	109,205	30,208	20,695
Net cash provided by operating activities	613,909	557,536	389,063
Cash flows from investing activities:
Payments for property, plant and equipment	(681,120)	(566,256)	(533,512)
Proceeds from sale of property, plant and equipment	2,815	27,209	2,727
Acquisition of business, net of cash acquired	0	(41,865)	0
Cash transferred on sale of subsidiary to J-Devices, net of proceeds	(15,774)	0	0
Payments from J-Devices	0	8,843	15,484
Investment in J-Devices	0	(67,372)	0
Purchase of short-term investment	(20,000)	0	0
Proceeds from short-term investment	20,000	0	0
Other investing activities	(399)	(1,053)	(4,820)
Net cash used in investing activities	(694,478)	(640,494)	(520,121)
Cash flows from financing activities:
Borrowings under revolving credit facilities	0	5,000	0
Payments under revolving credit facilities	0	5,000	0
Borrowings under short-term debt	0	0	30,000
Payments of short-term debt	0	0	(50,000)
Proceeds from issuance of long-term debt	80,000	375,000	637,528
Payments of long-term debt	(145,000)	(80,000)	(420,116)
Payments for debt issuance costs	(903)	(3,216)	(6,007)
Payments for retirement of debt	0	(11,619)	0
Payment of deferred consideration for an acquisition	(18,763)	0	0
Payments for repurchase of common stock	0	0	(80,946)
Proceeds from issuance of stock through share-based compensation plans	6,250	446	182
Payments of tax withholding for restricted shares	(1,579)	(466)	(609)
Net cash (used in) provided by financing activities	(79,995)	280,145	110,032
Effect of exchange rate fluctuations on cash and cash equivalents	68	207	(557)
Net (decrease) increase in cash and cash equivalents	(160,496)	197,394	(21,583)
Cash and cash equivalents, beginning of period	610,442	413,048	434,631
Cash and cash equivalents, end of period	449,946	610,442	413,048
Cash paid during the period for:
Interest	100,650	100,577	86,138
Income taxes	37,315	18,318	8,199
Non-cash investing and financing activities:
Additions to property, plant and equipment included in capital expenditures payable	127,568	104,800	122,969
Common stock issuance for conversion and exchange in 2014 and 2013, respectively, of 6.0% convertible senior subordinated notes due April 2014, $150 million related party in 2013	$ 56,350	$ 193,650	$ 0

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 133,887	$ 111,657	$ 42,702
Other comprehensive (loss) income, net of tax:
Adjustments to unrealized components of defined benefit pension plans, net of tax	(1,512)	4,360	5,137
Foreign currency translation adjustment	(11,964)	(4,895)	(2,688)
Equity interest in J-Devices' other comprehensive loss, net of tax	(19,136)	(10,961)	(2,057)
Total other comprehensive (loss) income	(32,612)	(11,496)	392
Comprehensive income	101,275	100,161	43,094
Comprehensive income attributable to noncontrolling interests	3,501	2,361	884
Comprehensive income attributable to Amkor	$ 97,774	$ 97,800	$ 42,210

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Accounts Receivable, Trade

12 Months Ended

Dec. 31, 2014

Accounts Receivable, Trade [Abstract]

Accounts Receivable, Trade

9. Factoring of Accounts Receivable

In certain foreign locations, we use non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the year ended December 31, 2014 and 2013, we sold accounts receivable totaling $340.0 million and $130.2 million, respectively, for a discount, plus fees, of $1.5 million and $0.6 million, respectively.

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(Details) (Employee Separation Costs [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Accrual, Beginning of year	$ 0	$ 1,607
Charges	3,889	10,506	11,200
Cash Payments	(3,973)	(12,531)
Non-cash Amounts	84	418
Accrual, End of year	0	0	1,607
Selling, General and Administrative Expenses [Member]
Restructuring Reserve [Roll Forward]
Charges			$ 3,900

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Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Jan. 30, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	AMKOR TECHNOLOGY INC
Entity Central Index Key	0001047127
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		237,283,749
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,102.6

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Inventories

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventories

10. Inventories

Inventories consist of the following:

	December 31,
	2014		2013
	(In thousands)
Raw materials and purchased components	$	161,942	$	147,292
Work-in-process	61,437		53,131
Total inventories	$	223,379	$	200,423

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Pension and Severance Plans (Defined Benefit Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 81,572,000	$ 80,528,000
Service cost	5,042,000	5,909,000
Interest cost	3,051,000	3,170,000
Benefits paid	(2,620,000)	(1,602,000)
Actuarial losses (gains)	3,514,000	(2,513,000)
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0	13,017,000
Defined Benefit Plan, Divestitures, Benefit Obligation	(14,814,000)	0
Effects of curtailment	0	(176,000)
Settlement	0	(8,701,000)
Foreign exchange gain	(1,736,000)	(8,060,000)
Projected benefit obligation at end of year	74,009,000	81,572,000	80,528,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	50,304,000	58,146,000
Actual gain on plan assets	4,149,000	5,159,000
Employer contributions	3,756,000	1,120,000
Settlement	0	(8,701,000)
Foreign exchange loss	(818,000)	(3,818,000)
Fair value of plan assets at end of year	54,771,000	50,304,000	58,146,000
Funded status of the Plans at end of year	(19,238,000)	(31,268,000)
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Accrued benefit liability (included in pension and severance obligations)	(19,200,000)	(31,300,000)
Accumulated benefit obligation	44,100,000	55,900,000
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate projected benefit obligation	74,044,000	73,326,000
Aggregate fair value of plan assets	54,771,000	41,957,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate accumulated benefit obligation	11,854,000	24,877,000
Aggregate fair value of plan assets	0	0
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate for determining net periodic pension cost	3.90%	3.90%	4.20%
Discount rate for determining benefit obligations at year end	4.20%	3.90%	4.00%
Rate of compensation increase for determining net periodic pension cost	4.10%	4.10%	4.50%
Rate of compensation increase for determining benefit obligations at year end	4.70%	4.10%	4.10%
Expected rate of return on plan assets for determining net periodic pension cost	6.20%	6.30%	6.30%
Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	22,825,000	20,173,000
Foreign Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Return on Plan Assets	3,094,000	3,508,000	3,188,000
Defined Benefit Plan, Net Periodic Benefit Cost	5,256,000	5,944,000	6,960,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	176,000	(1,089,000)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(97,000)	120,000	100,000
Pension Expense	5,353,000	5,648,000	7,949,000
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	116,000	231,000	291,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	5,042,000	5,909,000	6,362,000
Interest cost	3,051,000	3,170,000	3,270,000
Actuarial losses (gains)	(141,000)	(142,000)	(225,000)
Philippine Subsidiaries [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount of employer and related party securities included in plan assets	$ 700,000	$ 600,000
Philippine Subsidiaries [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	55.00%
Philippine Subsidiaries [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	45.00%

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Business Segments (Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 2,206,476	$ 2,006,553
Net sales	3,129,440	2,956,450	2,759,546
CHINA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	575,207	524,967
Net sales	270,282	47,202	28,641
IRELAND
Segment Reporting Information [Line Items]
Net sales	175,095	97,180	110,529
JAPAN
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	145	10,799
Net sales	268,420	394,834	349,360
KOREA, REPUBLIC OF
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	948,192	916,777
MALAYSIA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	50,137	61,080
PHILIPPINES
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	301,291	240,187
SINGAPORE
Segment Reporting Information [Line Items]
Net sales	432,942	496,601	452,737
TAIWAN, PROVINCE OF CHINA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	317,192	236,178
Net sales	212,719	144,825	99,047
THAILAND
Segment Reporting Information [Line Items]
Net sales	104,608	116,376	139,134
Other Foreign Countries [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	293	93
Net sales	533,951	454,218	437,148
Total Foreign Countries [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	2,192,457	1,990,081
Net sales	1,998,017	1,751,236	1,616,596
UNITED STATES
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	14,019	16,472
Net sales	1,131,423	1,205,214	1,142,950
Customer One [Member] | Sales [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	17.50%	23.70%	21.30%
Customer Two [Member] | Sales [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	13.20%	10.50%
Advanced Products [Member]
Segment Reporting Information [Line Items]
Net sales	1,552,948	1,451,664	1,302,145
Mainstream Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 1,576,492	$ 1,504,786	$ 1,457,401

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 449,946	$ 610,442
Restricted cash	2,681	2,681
Accounts Receivable, Net of Allowances of $1,377 and $7,120	469,683	385,542
Inventories	223,379	200,423
Other current assets	52,259	33,328
Total current assets	1,197,948	1,232,416
Property, plant and equipment, net	2,206,476	2,006,553
Investments	117,733	105,214
Restricted cash	2,123	2,234
Other assets	111,125	80,881
Total assets	3,635,405	3,427,298
Current liabilities:
Short-term borrowings and current portion of long-term debt	5,000	61,350
Trade accounts payable	309,025	260,534
Capital expenditures payable	127,568	104,800
Accrued expenses	258,997	264,252
Total current liabilities	700,590	690,936
Long-term debt	1,450,824	1,516,390
Long-term debt, related party	75,000	75,000
Pension and severance obligations	152,673	165,073
Other non-current liabilities	125,382	14,959
Total liabilities	2,504,469	2,462,358
Commitments and contingencies (Note 18)
Amkor stockholders' equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	0	0
Common stock, $0.001 par value, 500,000 shares authorized, 282,231 and 262,109 shares issued, and 236,627 and 216,702 shares outstanding, in 2014 and 2013, respectively	282	262
Additional paid-in capital	1,878,810	1,812,530
Accumulated deficit	(516,962)	(647,348)
Accumulated other comprehensive loss	(32,867)	(255)
Treasury stock, at cost, 45,604 and 45,407 shares in 2014 and 2013, respectively	(213,028)	(211,449)
Total Amkor stockholders’ equity	1,116,235	953,740
Noncontrolling interests in subsidiaries	14,701	11,200
Total equity	1,130,936	964,940
Total liabilities and equity	$ 3,635,405	$ 3,427,298

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Sale of Subsidiary to J-Devices

12 Months Ended

Dec. 31, 2014

Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

4. Sale of Subsidiary to J-Devices

On June 30, 2014, we sold 100% of the shares of our wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan to J-Devices, our equity-method joint venture in Japan, for ¥1.1 billion ($9.6 million). For additional information regarding our investment in J-Devices, we refer you to Note 12. We received ¥0.1 billion ($1.0 million) in cash from J-Devices at closing and will receive the remaining ¥1.0 billion ($8.6 million) by June 30, 2015. We recognized a net gain on the sale of $9.2 million in our consolidated financial statements in other (income) expense, net, which includes a gain of $12.6 million from the release of accumulated foreign currency translation adjustments associated with the entity (Note 16). J-Devices recognized a gain of $14.7 million on the transaction in its consolidated financial statements as the fair value of the net assets acquired exceeded the purchase price. The gain recognized by J-Devices increased our equity in earnings of J-Devices by $8.8 million. The combined net gain we recognized was $18.0 million.

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Business Acquisitions Business Acquisitions

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

3. Business Acquisitions

On July 31, 2013, we completed the purchase of 100% of the shares of Toshiba Electronics Malaysia Sdn. Bhd., Toshiba’s power discrete semiconductor packaging and test operation in Malaysia, and subsequently changed the name of the entity to Amkor Technology Malaysia Sdn. Bhd. The total price for the shares was $61.2 million, based on the net asset value at closing. We paid $42.4 million in cash at closing and paid the remaining $18.8 million in March 2014. We were also granted a non-exclusive, royalty bearing license by Toshiba to certain intellectual property rights for providing packaging and test services for power discrete and certain other semiconductor products. The license has a royalty cap of ¥1.5 billion (approximately $13 million). Under the purchase method of accounting, we allocated the purchase price to the assets acquired and liabilities assumed based on their estimated fair values on the date of acquisition. We did not record any goodwill as a result of the acquisition.

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Pension and Severance Plans

12 Months Ended

Dec. 31, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Pension and Severance Plans

15.Pension and Severance Plans

Defined Contribution Plans

We sponsor defined contribution plans in Malaysia, Taiwan and the U.S. Total defined contribution expense was $6.8 million, $5.2 million and $4.1 million for 2014, 2013 and 2012, respectively.

Korean Severance Plan

Our subsidiary in Korea participates in an accrued severance plan that covers employees with at least one year of service. To the extent eligible employees are terminated, our subsidiary in Korea would be required to make lump-sum severance payments on behalf of these eligible employees based on their length of service, seniority and rate of pay at the time of termination. Accrued severance benefits are estimated assuming all eligible employees were to terminate their employment at the balance sheet date. Our contributions to the National Pension Plan of the Republic of Korea are deducted from accrued severance benefit liabilities.

The changes to the balance of our severance accrual are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at the beginning of year	$	145,373		$	126,762		$	106,715
Provision of severance benefits	17,593			26,550			19,667
Severance payments	(10,160		)	(10,402		)	(8,520		)
(Gain) loss on foreign currency	(5,926		)	2,463			8,900
	146,880			145,373			126,762
Payments remaining with the National Pension Fund	(219		)	(241		)	(249		)
Total severance obligation balance at the end of year	146,661			145,132			126,513
Less current portion of accrued severance obligation (Note 13)	13,226			11,197			9,516
Non-current portion of severance obligation	$	133,435		$	133,935		$	116,997

Foreign Defined Benefit Pension Plans

Our subsidiaries in Japan, Malaysia, the Philippines and Taiwan sponsor defined benefit plans (the “Plans”) that cover substantially all of their respective employees who are not covered by statutory plans. Charges to expense are based upon actuarial analyses.

The following table summarizes the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2014 and 2013.

	For the Year Ended December 31,
	2014			2013
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	81,572		$	80,528
Service cost	5,042			5,909
Interest cost	3,051			3,170
Benefits paid	(2,620		)	(1,602		)
Actuarial losses (gains)	3,514			(2,513		)
Acquisition (Note 3)	—			13,017
Divestiture (Note 4)	(14,814		)	—
Effects of curtailment	—			(176		)
Settlement	—			(8,701		)
Foreign exchange gain	(1,736		)	(8,060		)
Projected benefit obligation at end of year	74,009			81,572
Change in plan assets:
Fair value of plan assets at beginning of year	50,304			58,146
Actual gain on plan assets	4,149			5,159
Employer contributions	3,756			1,120
Settlement	—			(8,701		)
Benefits paid	(2,620		)	(1,602		)
Foreign exchange loss	(818		)	(3,818		)
Fair value of plan assets at end of year	54,771			50,304
Funded status of the Plans at end of year	$	(19,238	)	$	(31,268	)

The accrued benefit liability, included in pension and severance obligations in the Consolidated Balance Sheets, as of December 31, 2014 and 2013 was $19.2 million and $31.3 million, respectively. The accumulated benefit obligation as of December 31, 2014 and 2013 was $44.1 million and $55.9 million, respectively.

The following table summarizes, by component, the change in accumulated other comprehensive income related to our Plans:

	Prior Service Cost		Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2012, net of tax	$	188	$	(5,561	)	$	(5,373	)
Amortization included in net periodic pension cost	250		114			364
Net gain arising during period	—		3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	250		4,110			4,360
Balance at December 31, 2013, net of tax	$	438	$	(1,451	)	$	(1,013	)
Amortization included in net periodic pension cost	102		110			212
Net gain arising during period	—		(1,724		)	(1,724		)
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	102		(1,614		)	(1,512		)
Balance at December 31, 2014, net of tax	$	540	$	(3,065	)	$	(2,525	)
Estimated amortization of cost to be included in 2015 net periodic pension cost	$	34	$	84		$	118

Information for pension plans with benefit obligations in excess of plan assets are as follows:

	December 31,
	2014		2013
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	74,044	$	73,326
Aggregate fair value of plan assets	54,771		41,957
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	11,854		24,877
Aggregate fair value of plan assets	—		—

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,042		$	5,909		$	6,362
Interest cost	3,051			3,170			3,270
Expected return on plan assets	(3,094		)	(3,508		)	(3,188		)
Amortization of prior service cost	116			231			291
Recognized actuarial loss	141			142			225
Net periodic pension cost	5,256			5,944			6,960
Curtailment (gain) loss	—			(176		)	1,089
Settlement loss (gain)	97			(120		)	(100		)
Total pension expense	$	5,353		$	5,648		$	7,949

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligation at December 31, 2014, 2013 and 2012:

	For the Year Ended December 31,
	2014		2013		2012
Discount rate for determining net periodic pension cost	3.9	%	3.9	%	4.2	%
Discount rate for determining benefit obligations at year end	4.2	%	3.9	%	4.0	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.1	%	4.5	%
Rate of compensation increase for determining benefit obligations at year end	4.7	%	4.1	%	4.1	%
Expected rate of return on plan assets for determining net periodic pension cost	6.2	%	6.3	%	6.3	%

The measurement date for determining the Plans’ assets and benefit obligations is December 31, each year. Discount rates are generally derived from yield curves constructed from high-quality corporate or foreign government bonds, for which the timing and amount of cash outflows approximate the estimated payouts.

The expected rate of return assumption is based on weighted-average expected returns for each asset class. Expected returns reflect a combination of historical performance analysis and the forward-looking views of the financial markets and include input from our actuaries. We have no control over the direction of our investments in our defined benefit plans in Taiwan as the local Labor Standards Law Fund mandates such contributions into a cash account balance at the Bank of Taiwan. The defined benefit pension plans in Japan and Malaysia are non-funded plans, and as such, no assets exist related to these plans. Our investment strategy for our Philippine defined benefit plan is based on long-term, sustained asset growth through low to medium risk investments. The current rate of return assumption targets are based on an asset allocation strategy for our Philippine plan assets of 55% debt securities (primarily Philippines and U.S.) and 45% equity securities (primarily U.S., Philippines and Europe). Philippine plan assets included Amkor common stock totaling $0.7 million and $0.6 million at December 31, 2014, and December 31, 2013, respectively.

The fair value of our pension plan assets at December 31, 2014, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	5,742	$	—	$	5,742
Equity securities
Foreign securities	3,035		—		3,035
U.S. securities	19,790		—		19,790
	22,825		—		22,825
U.S. fixed income funds	4,321		—		4,321
Bonds
U.S. government bonds	—		2,840		2,840
Foreign treasury notes	10,156		—		10,156
	10,156		2,840		12,996
Taiwan retirement fund	8,632		—		8,632
Other	—		255		255
Total	$	51,676	$	3,095	$	54,771

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	4,542	$	—	$	4,542
Equity securities
Foreign securities	1,950		—		1,950
U.S. securities	18,223		—		18,223
	20,173		—		20,173
U.S. fixed income funds	4,186		—		4,186
Bonds
U.S. government bonds	—		2,087		2,087
Foreign treasury notes	10,374		—		10,374
	10,374		2,087		12,461
Taiwan retirement fund	8,840		—		8,840
Other	—		102		102
Total	$	48,115	$	2,189	$	50,304

The Taiwan retirement fund category of our plan assets represents accounts that our subsidiaries in Taiwan have in a government labor retirement fund in the custody of the Bank of Taiwan. The accounts earn a minimum guaranteed rate of return. We have no control over the investment decisions of the fund which is invested in a mix of cash, domestic and foreign equity securities and domestic and foreign debt securities.

We expect to make contributions of $1.7 million during 2015. We closely monitor the funded status of the Plans with respect to legislative requirements. We intend to make at least the minimum contribution required by law each year.

The estimated future benefit payments related to our foreign defined benefit plans are as follows:

	Payments
	(In thousands)
2015	$	1,384
2016	2,019
2017	1,869
2018	2,430
2019	3,710
2020 to 2024	28,694

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

11. Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2014			2013
	(In thousands)
Land	$	207,985		$	208,048
Land use rights	26,845			26,845
Buildings and improvements	940,846			911,258
Machinery and equipment	3,953,891			3,577,045
Software and computer equipment	185,243			193,641
Furniture, fixtures and other equipment	15,347			17,430
Construction in progress	39,261			27,039
Total property, plant and equipment	5,369,418			4,961,306
Less accumulated depreciation and amortization	(3,162,942		)	(2,954,753		)
Total property, plant and equipment, net	$	2,206,476		$	2,006,553

Depreciation expense was $463.5 million, $406.7 million and $366.6 million for 2014, 2013 and 2012, respectively.

In 2013, we purchased land and have commenced construction activities for K5. We have recorded capitalized interest related to these activities of $8.6 million and $1.7 million as of December 31, 2014 and 2013, respectively.

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Pension and Severance Plans (Defined Benefit Plans - Expected future contributions and other disclosures) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Employer contributions		$ 3,756,000	$ 1,120,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	1,700,000
2013		1,384,000
2014		2,019,000
2015		1,869,000
2016		2,430,000
2017		3,710,000
2018 to 2022		$ 28,694,000

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Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

7. Income Taxes

Geographic sources of income (loss) before income taxes are as follows:

	For the Year Ended December 31,
	2014		2013			2012
	(In thousands)
United States	$	16,571	$	(36,829	)	$	17,062
Foreign	119,507		160,816			37,049
Total income before income taxes	$	136,078	$	123,987		$	54,111

The provision for income taxes includes current federal, state and foreign taxes payable and those deferred because of temporary differences between the financial statement and the tax bases of assets and liabilities.

The components of the provision (benefit) for income taxes are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	(46		)	—			(75		)
Foreign	51,081			30,902			10,998
	51,035			30,902			10,923
Deferred
Federal	—			(8,556		)	1,859
State	—			9			266
Foreign	(17,190		)	291			3,953
	(17,190		)	(8,256		)	6,078
Total provision	$	33,845		$	22,646		$	17,001
Effective Tax Rate	24.9		%	18.3		%	31.4		%

The reconciliation between the U.S. federal statutory income tax rate of 35% and our income tax provision is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
U.S. federal tax at 35%	$	47,627		$	43,396		$	18,939
State taxes, net of federal benefit	1,940			1,124			1,126
Foreign income taxed at different rates	6,579			(17,814		)	(14,717		)
Foreign exchange (loss) gain	(17,321		)	844			12,329
Change in valuation allowance	(13,527		)	(32,415		)	(3,112		)
Adjustments related to prior years	3,643			2,727			(2,464		)
Income tax credits generated	(2,557		)	(2,622		)	(1,370		)
Repatriation of foreign earnings and profits	3,958			6,499			3,240
Expiration of capital loss carryforward	—			15,555			—
Expiration of net operating losses	2,534			—			—
Equity in earnings of J-Devices	—			—			2,404
Debt conversion costs	—			4,067			—
Other	969			1,285			626
Total	$	33,845		$	22,646		$	17,001

During 2013, we incurred costs which are not deductible for income tax purposes including certain costs in connection with the exchange of the 2014 Notes for shares of our common stock. The 2014 change in foreign income taxed at different rates is due to a change in the geographic income mix which resulted in a lower tax benefit in the current year.

Income tax expense in 2012 includes deferred taxes on undistributed earnings from our investment in J-Devices. In 2013 and 2014, deferred taxes were not required as a result of a change in our ownership structure of our investment in J-Devices.

The following is a summary of the components of our deferred tax assets and liabilities:

	December 31,
	2014			2013
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	120,639		$	147,905
Income tax credits	24,754			27,751
Property, plant and equipment	19,796			14,390
Accrued liabilities	76,682			57,374
Unrealized foreign exchange loss	4,947			3,893
Other	12,963			15,137
Total deferred tax assets	259,781			266,450
Valuation allowance	(149,847		)	(179,183		)
Total deferred tax assets net of valuation allowance	109,934			87,267
Deferred tax liabilities:
Property, plant and equipment	27,921			21,716
Deferred gain	5,036			6,295
Other	2,844			1,967
Total deferred tax liabilities	35,801			29,978
Net deferred tax assets	$	74,133		$	57,289
Recognized as:
Other current assets	$	21,864		$	10,729
Other assets	54,950			47,609
Accrued expenses	(1,092		)	(97		)
Other non-current liabilities	(1,589		)	(952		)
Total	$	74,133		$	57,289

In 2014, the valuation allowance on our deferred tax assets decreased by $29.3 million primarily as a result of the utilization of domestic net operating loss carryforwards and the reduction of valuation allowance as the result of the sale of a subsidiary.

In 2013, the valuation allowance on our deferred tax assets decreased by $30.6 million primarily as a result of the utilization of domestic net operating loss carryforwards and expiring capital losses. Also during 2013, we concluded that sufficient net positive evidence existed to release the valuation allowance against the deferred tax assets at one of our foreign jurisdictions. The recent trend of improving taxable operating results in this jurisdiction continued in 2013, and we believe this recent history of earnings is sustainable and sufficient to fully realize the deferred tax assets in this jurisdiction.

In 2012, the valuation allowance on our deferred tax assets decreased by $4.5 million primarily as a result of the utilization of domestic net operating loss carryforwards partially offset by an increase associated with losses and reserves in certain foreign jurisdictions.

As a result of certain income tax accounting realization requirements with respect to accounting for share-based compensation, the table of deferred tax assets and liabilities shown above does not include certain deferred tax assets at December 31, 2014 and 2013 that arose directly from tax deductions related to equity compensation that is greater than the compensation recognized for financial reporting. If such deferred tax assets are subsequently realized, they will be recorded to contributed capital in the amount of $6.9 million. As a result of net operating loss carryforwards, we were not able to recognize the excess tax benefits of stock option deductions in 2014 because the deductions did not reduce income tax payable.

As a result of certain capital investments, export commitments and employment levels, income from operations in China, Korea, Malaysia, the Philippines and Taiwan was subject to reduced income tax rates and in some cases is exempt from income taxes. The reduced tax rates or tax exemptions expire at various dates through 2022. We recognized $0.9 million, $4.8 million and $13.7 million in tax benefits as a result of the tax holidays in 2014, 2013 and 2012, respectively. The benefit of the tax holidays on diluted earnings per share was approximately $0.00, $0.02 and $0.06 for 2014, 2013 and 2012, respectively.

Our net operating loss carryforwards (“NOL’s”) are as follows:

	For the Year Ended December 31,
	2014		2013		Expiration
	(In thousands)
U.S. Federal NOL’s	$	317,841	$	342,770	2021-2033
U.S. State NOL’s	173,756		197,618		2015-2031
Foreign NOL’s	4,962		38,337		2015-2024

The deferred tax assets associated with certain of our foreign net operating losses have been reserved with a valuation allowance. The deferred tax assets associated with our U.S. federal and state net operating losses available for carryforward have been fully reserved with valuation allowances at December 31, 2014 and 2013. Also, our ability to utilize our U.S. net operating loss carryforwards may be limited in the future if we experience an ownership change as defined by the Internal Revenue Code.

At December 31, 2014, we have various tax credits available to be carried forward including U.S. foreign income tax credits totaling $8.1 million, expiring in 2016 and income tax credits totaling $11.1 million expiring in varying amounts through 2019 at our subsidiary in Korea. The deferred tax assets associated with the U.S. foreign income tax credits and certain foreign income tax credits have been fully reserved with a valuation allowance. Income tax credits generated by certain of our foreign subsidiaries in 2014, 2013 and 2012 have been recognized in our income tax provision.

Income taxes have not been provided on approximately $721.7 million of the undistributed earnings of our foreign subsidiaries at December 31, 2014, over which we have sufficient influence to control the distribution of such earnings and have determined that substantially all such earnings have been reinvested indefinitely. These earnings could become subject to either or both federal income tax and foreign withholding tax if they are remitted as dividends, if foreign earnings are loaned to any of our domestic companies, or if we sell our investment in certain subsidiaries. We estimate that repatriation of these foreign earnings would generate additional foreign withholding taxes of approximately $21.5 million and insignificant U.S. federal income tax after foreign tax credits.

We operate in and file income tax returns in various U.S. and foreign jurisdictions which are subject to examination by tax authorities. The conclusion of examination of our 2008-2012 Korean income tax returns during 2014 did not result in any significant additional impact to income tax expense. Current examinations include our 2010, 2012 and 2013 Philippines income tax returns. We have tax returns that are open to examination in various jurisdictions for tax years 2009-2014. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits.

A reconciliation of the beginning and ending gross amount of unrecognized tax benefits is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at January 1	$	27,128		$	8,218		$	7,930
Additions based on tax positions related to the current year	6,032			17,752			5,551
Additions for tax positions of prior years	1,240			2,723			54
Reductions for tax positions of prior years	(15,433		)	(108		)	(4,091		)
Reductions related to settlements with tax authorities	(6,297		)	(1,353		)	(1,226		)
Reductions from lapse of statutes of limitations	—			(104		)	—
Balance at December 31	$	12,670		$	27,128		$	8,218

The net decrease in our unrecognized tax benefits was $14.5 million from December 31, 2013 to December 31, 2014. Our unrecognized tax benefits decreased primarily because of a $15.4 million reduction related to the application of a tax law change and a $5.1 million reduction related to the settlement of a tax examination in a foreign jurisdiction. These decreases were offset by $6.0 million of additions related to income attribution and other unrecognized tax benefits. At December 31, 2014, all of our gross unrecognized tax benefits would reduce our effective tax rate, if recognized.

The liability related to our unrecognized tax benefits is $10.5 million as of December 31, 2014, and is reported as a component of other non-current liabilities. The unrecognized tax benefits presented in the table above include positions that have reduced deferred tax assets, which are not included in the liability reported as a component of other non-current liabilities.

It is reasonably possible that the total amount of unrecognized tax benefits related to revenue attribution will decrease by up to $0.6 million due to the lapse of statues of limitations in foreign jurisdictions.

Our unrecognized tax benefits are subject to change as examinations of specific tax years are completed in the respective jurisdictions. Tax return examinations involve uncertainties and there can be no assurance that the outcome of examinations will be favorable.

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Income Taxes (Tax holidays) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income Tax Holiday, Termination Date	2022
Income Tax Holiday, Aggregate Dollar Amount	$ 0.9	$ 4.8	$ 13.7
Income Tax Holiday, Tax Benefit, Diluted Earnings Per Share	$ 0.00	$ 0.02	$ 0.06

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Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Plans

5. Share-Based Compensation Plans

Our share-based compensation is measured at fair value and expensed over the service period (generally the vesting period). The amount of compensation expense to be recognized is adjusted for an estimated forfeiture rate which is based on historical data. For the years ended December 31, 2014, 2013 and 2012, we recognized share-based compensation attributable to stock options and restricted shares of $3.7 million, $3.0 million and $2.7 million, respectively, primarily in selling, general and administrative expenses. There were no corresponding deferred income tax benefits for stock options or restricted shares.

Equity Incentive Plan

Amended and Restated 2007 Equity Incentive Plan.  The Amended and Restated 2007 Equity Incentive Plan, (the “2007 Plan”) provides for the grant of the following types of incentive awards: (i) stock options, (ii) restricted stock, (iii) restricted stock units, (iv) stock appreciation rights, (v) performance units and performance shares and (vi) other stock or cash awards. Those eligible for awards include employees, directors and consultants who provide services to Amkor and its subsidiaries. The 2007 Plan has a contractual life of ten years and can be terminated at the discretion of the Board of Directors. There were originally 17.0 million shares of our common stock reserved for issuance under the 2007 Plan and at December 31, 2014 there were 11.4 million shares available for grant.

Stock options

Stock options are generally granted with an exercise price equal to the market price of the stock at the date of grant. Substantially all of the options granted are exercisable pursuant to a two to five year vesting schedule and the term of the options granted is no longer than ten years. Upon option exercise, we may issue new shares of common or treasury stock.

In order to calculate the fair value of stock options at the date of grant, we use the Black-Scholes option pricing model. Expected volatilities are based on historical performance of our stock. We also use historical data to estimate the timing and amount of option exercises and forfeitures within the valuation model. The expected term of the options is based on evaluations of historical and expected future employee exercise behavior and represents the period of time that options granted are expected to be outstanding. The risk-free interest rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.

The following table summarizes our stock option activity for the year ended December 31, 2014:

	Number of Shares (In thousands)	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (In thousands)
Outstanding at December 31, 2013	4,873	$	6.52
Granted	330	8.15
Exercised	(1,011)	6.18
Forfeited or expired	(370)	11.71
Outstanding at December 31, 2014	3,822	$	6.25	6.61	$	6,376
Fully vested at December 31, 2014 and expected to vest thereafter	3,798	$	6.26	6.59	$	6,325
Exercisable at December 31, 2014	2,113	$	7.17	4.93	$	2,454

The following assumptions were used to calculate the weighted average fair values of the options granted:

	For the Year Ended December 31,
	2014			2013			2012
Expected life (in years)	6.1			6.2			6.0
Risk-free interest rate	2.0		%	1.7		%	1.0		%
Volatility	57		%	60		%	65		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	4.46		$	2.49		$	2.68

Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $4.3 million as of December 31, 2014, which is expected to be recognized over a weighted-average period of approximately 2.5 years beginning January 1, 2015.

Restricted Shares

We grant restricted shares to employees under the 2007 Plan. The restricted shares vest ratably over four years, with 25% of the shares vesting at the end of the first year and the remainder vesting monthly or quarterly thereafter, depending on the grant, such that 100% of the shares will become vested on the fourth anniversary of the award, subject to the recipient’s continued employment with us on the applicable vesting dates. In addition, provided that the restricted shares have not been forfeited earlier, for certain grants, the restricted shares will vest upon the recipient’s death, disability or retirement, or upon a change in control of Amkor or, in some cases, upon retirement. Although ownership of the restricted shares does not transfer to the recipients until the shares have vested, recipients have voting and dividend rights on these shares from the date of grant. The value of the restricted shares is determined based on the fair market value of the underlying shares on the date of the grant and is recognized ratably over the vesting period or to the date on which the recipient becomes retirement eligible, if shorter. Upon vesting of restricted stock awards, we may issue new shares of common or treasury stock.

The following table summarizes our restricted share activity for the year ended December 31, 2014:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2013	1,172		$	4.83
Awards granted	—		—
Awards vested	(479	)	5.18
Awards forfeited	(33	)	4.68
Nonvested at December 31, 2014	660		$	4.58

Total unrecognized compensation cost, net of a forfeiture estimate, was $2.6 million as of December 31, 2014, which is expected to be recognized over a weighted average period of approximately 2.1 years beginning January 1, 2015.

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Other Income and Expense Other Income and Expense

12 Months Ended

Dec. 31, 2014

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

6. Other Income and Expense

Other income and expense consists of the following:

	December 31,
	2014			2013			2012
	(In thousands)
Interest income	$	(3,359	)	$	(3,785	)	$	(3,160	)
Foreign currency (gain) loss, net	(9,808		)	(5,626		)	4,185
Loss on debt retirement	757			12,330			1,199
Gain on sale of subsidiary to J-Devices (Note 4)	(9,155		)	—			—
Other income, net	(2,978		)	(705		)	(1,586		)
Total other (income) expense, net	$	(24,543	)	$	2,214		$	638

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Earnings Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share

8. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding includes restricted shares held by retirement eligible recipients and is reduced for treasury stock. We grant restricted shares which entitle recipients to voting and nonforfeitable dividend rights from the date of grant therefore our unvested share-based compensation awards are considered participating securities and are included in the computation of EPS pursuant to the two-class method.

Diluted EPS is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, unvested restricted shares and convertible debt. The following table summarizes the computation of basic and diluted EPS:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands, except per share data)
Net income attributable to Amkor	$	130,386		$	109,296		$	41,818
Income allocated to participating securities	(372		)	(681		)	(212		)
Net income available to Amkor common stockholders — basic	130,014			108,615			41,606
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	6			93			212
Interest on 6.0% convertible notes due 2014, net of tax	1,039			9,440			16,103
Net income attributable to Amkor — diluted	$	131,059		$	118,148		$	57,921
Weighted average shares outstanding — basic	230,710			187,032			160,105
Effect of dilutive securities:
Stock options and restricted share awards	712			21			241
6.0% convertible notes due 2014	5,309			48,277			82,658
Weighted average shares outstanding — diluted	236,731			235,330			243,004
Net income attributable to Amkor per common share:
Basic	$	0.56		$	0.58		$	0.26
Diluted	0.55			0.50			0.24

The following table summarizes the potential shares of common stock that were excluded from diluted EPS, because the effect of including these potential shares was antidilutive:

	For the Year Ended December 31,
	2014	2013	2012
	(In thousands)
Stock options and restricted share awards	1,303	4,890	4,416

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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dilutive Securities Adjustments [Line Items]
Net Income (Loss) Attributable to Parent	$ 130,386	$ 109,296	$ 41,818
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	372	681	212
Net Income (Loss) Available to Common Stockholders, Basic	130,014	108,615	41,606
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Reallocation of Net Income to Participating Securities	6	93	212
Net Income (Loss) Available to Common Stockholders, Diluted	131,059	118,148	57,921
Weighted Average Number of Shares Outstanding, Basic	230,710	187,032	160,105
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Weighted Average Number of Shares Outstanding, Diluted	236,731	235,330	243,004
Earnings Per Share, Basic and Diluted [Abstract]
Earnings Per Share, Basic	$ 0.56	$ 0.58	$ 0.26
Earnings Per Share, Diluted	$ 0.55	$ 0.50	$ 0.24
Stock Options and Restricted Share Awards [Member]
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	712	21	241
Convertible Notes Due 2014 [Member]
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Interest on Convertible Debt, Net of Tax	$ 1,039	$ 9,440	$ 16,103
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	5,309	48,277	82,658
Earnings Per Share, Basic and Diluted [Abstract]
Interest rate of convertible subordinated notes	6.00%

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Accumulated Other Comprehensive Income and Loss (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	$ (32,867)	$ (255)	$ 11,241
Other comprehensive income (loss) before reclassifications	(20,237)	(11,860)
Amounts reclassified from accumulated other comprehensive (loss) income	(12,375)	364
Total other comprehensive (loss) income	(32,612)	(11,496)	392
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(2,525)	(1,013)	(5,373)
Other comprehensive income (loss) before reclassifications	(1,724)	3,996
Amounts reclassified from accumulated other comprehensive (loss) income	212	364
Total other comprehensive (loss) income	(1,512)	4,360
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(513)	11,451	16,346
Other comprehensive income (loss) before reclassifications	623	(4,895)
Amounts reclassified from accumulated other comprehensive (loss) income	(12,587)	0
Total other comprehensive (loss) income	(11,964)	(4,895)
Equity Interest in J-Devices' Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(29,829)	(10,693)	268
Other comprehensive income (loss) before reclassifications	(19,136)	(10,961)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Total other comprehensive (loss) income	$ (19,136)	$ (10,961)

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Accounts Receivable, Trade Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Total Factored [Member]
Factoring of Accounts Receivable [Line Items]
Accounts Receivable Sold without Recourse	$ 340.0	$ 130.2
Factoring Fees [Member]
Factoring of Accounts Receivable [Line Items]
Accounts Receivable Sold without Recourse	$ 1.5	$ 0.6

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Income Taxes (Income tax examination) (Details)	12 Months Ended
	Dec. 31, 2014
Minimum [Member] | United States [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2010
Minimum [Member] | KOREA, REPUBLIC OF
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2008
Minimum [Member] | PHILIPPINES
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2010
Minimum [Member] | JAPAN
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2008
Minimum [Member] | CHINA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2008
Minimum [Member] | SINGAPORE
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2009
Minimum [Member] | MALAYSIA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2007
Minimum [Member] | TAIWAN, PROVINCE OF CHINA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2010
Maximum [Member] | United States [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | KOREA, REPUBLIC OF
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | PHILIPPINES
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | JAPAN
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | CHINA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | SINGAPORE
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | MALAYSIA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013
Maximum [Member] | TAIWAN, PROVINCE OF CHINA
Income Tax Examination [Line Items]
Income Tax Examination, Year(s) under Examination	2013

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Schedule II - Valuation and Qualifying Accounts (Details) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$ 149,847	$ 179,183	$ 209,757	$ 214,269
Valuation Allowances and Reserves, Charged to Cost and Expense	(10,838)	(16,860)	(1,626)
Valuation Allowances and Reserves, Write-offs	(2,534)	(15,555)	(1,486)
Valuation Allowances and Reserves, Charged to Other Accounts	(15,964)	1,841	(1,400)
Valuation Allowances and Reserves, Balance	$ 149,847	$ 179,183	$ 209,757	$ 214,269

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

Geographic sources of income (loss) before income taxes are as follows:

	For the Year Ended December 31,
	2014		2013			2012
	(In thousands)
United States	$	16,571	$	(36,829	)	$	17,062
Foreign	119,507		160,816			37,049
Total income before income taxes	$	136,078	$	123,987		$	54,111

Schedule of Components of Income Tax Expense (Benefit)

The components of the provision (benefit) for income taxes are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	(46		)	—			(75		)
Foreign	51,081			30,902			10,998
	51,035			30,902			10,923
Deferred
Federal	—			(8,556		)	1,859
State	—			9			266
Foreign	(17,190		)	291			3,953
	(17,190		)	(8,256		)	6,078
Total provision	$	33,845		$	22,646		$	17,001
Effective Tax Rate	24.9		%	18.3		%	31.4		%

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation between the U.S. federal statutory income tax rate of 35% and our income tax provision is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
U.S. federal tax at 35%	$	47,627		$	43,396		$	18,939
State taxes, net of federal benefit	1,940			1,124			1,126
Foreign income taxed at different rates	6,579			(17,814		)	(14,717		)
Foreign exchange (loss) gain	(17,321		)	844			12,329
Change in valuation allowance	(13,527		)	(32,415		)	(3,112		)
Adjustments related to prior years	3,643			2,727			(2,464		)
Income tax credits generated	(2,557		)	(2,622		)	(1,370		)
Repatriation of foreign earnings and profits	3,958			6,499			3,240
Expiration of capital loss carryforward	—			15,555			—
Expiration of net operating losses	2,534			—			—
Equity in earnings of J-Devices	—			—			2,404
Debt conversion costs	—			4,067			—
Other	969			1,285			626
Total	$	33,845		$	22,646		$	17,001

Schedule of Deferred Tax Assets and Liabilities

The following is a summary of the components of our deferred tax assets and liabilities:

	December 31,
	2014			2013
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	120,639		$	147,905
Income tax credits	24,754			27,751
Property, plant and equipment	19,796			14,390
Accrued liabilities	76,682			57,374
Unrealized foreign exchange loss	4,947			3,893
Other	12,963			15,137
Total deferred tax assets	259,781			266,450
Valuation allowance	(149,847		)	(179,183		)
Total deferred tax assets net of valuation allowance	109,934			87,267
Deferred tax liabilities:
Property, plant and equipment	27,921			21,716
Deferred gain	5,036			6,295
Other	2,844			1,967
Total deferred tax liabilities	35,801			29,978
Net deferred tax assets	$	74,133		$	57,289
Recognized as:
Other current assets	$	21,864		$	10,729
Other assets	54,950			47,609
Accrued expenses	(1,092		)	(97		)
Other non-current liabilities	(1,589		)	(952		)
Total	$	74,133		$	57,289

Summary of Operating Loss Carryforwards

Our net operating loss carryforwards (“NOL’s”) are as follows:

	For the Year Ended December 31,
	2014		2013		Expiration
	(In thousands)
U.S. Federal NOL’s	$	317,841	$	342,770	2021-2033
U.S. State NOL’s	173,756		197,618		2015-2031
Foreign NOL’s	4,962		38,337		2015-2024

Schedule of Unrecognized Tax Benefits Rollforward

A reconciliation of the beginning and ending gross amount of unrecognized tax benefits is as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at January 1	$	27,128		$	8,218		$	7,930
Additions based on tax positions related to the current year	6,032			17,752			5,551
Additions for tax positions of prior years	1,240			2,723			54
Reductions for tax positions of prior years	(15,433		)	(108		)	(4,091		)
Reductions related to settlements with tax authorities	(6,297		)	(1,353		)	(1,226		)
Reductions from lapse of statutes of limitations	—			(104		)	—
Balance at December 31	$	12,670		$	27,128		$	8,218

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Share-Based Compensation Plans (Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 3.7	$ 3.0	$ 2.7

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Accrued Expenses

12 Months Ended

Dec. 31, 2014

Payables and Accruals [Abstract]

Accrued Expenses

13. Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2014		2013
	(In thousands)
Payroll and benefits	$	77,635	$	75,909
Deferred revenue and customer advances	56,829		44,764
Accrued settlement costs (Note 18)	32,414		43,324
Income taxes payable	31,580		17,528
Accrued interest	15,947		21,807
Accrued severance plan obligations (Note 15)	13,226		11,197
Acquisition payable (Note 3)	—		17,897
Other accrued expenses	31,366		31,826
Total accrued expenses	$	258,997	$	264,252

Accrued settlement costs relate to amounts due as a result of a patent license dispute (Note 18).

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

18. Commitments and Contingencies

We have a letter of credit sub-facility of $25.0 million under our $200.0 million senior secured revolving credit facility that matures in December 2019. As of December 31, 2014, we had $0.4 million of standby letters of credit outstanding and had an additional $24.6 million available for letters of credit. Such standby letters of credit are used in the ordinary course of our business and are collateralized by our cash balances.

We generally warrant that our services will be performed in a professional and workmanlike manner and in compliance with our customers’ specifications. We accrue costs for known warranty issues. Historically, our warranty costs have been immaterial.

Legal Proceedings

We are involved in claims and legal proceedings and may become involved in other legal matters arising in the ordinary course of our business. We evaluate these claims and legal matters on a case-by-case basis to make a determination as to the impact, if any, on our business, liquidity, results of operations, financial condition or cash flows. We believe that the ultimate outcome of these claims and proceedings, individually and in the aggregate, will not have a material adverse impact to us. Our evaluation of the potential impact of these claims and legal proceedings on our business, liquidity, results of operations, financial condition or cash flows could change in the future.

Proceedings with Tessera, Inc.

Since March 2006, we have been involved in several proceedings with Tessera, Inc. (“Tessera”) related to a license agreement (the “License Agreement”) entered into in 1996 between Tessera and our predecessor. The proceedings generally involved disputes about whether or not Amkor owed Tessera royalties under the License Agreement with respect to certain packages, the termination of the License Agreement and post-termination infringement.

More recently, the proceedings included those instituted in the International Court of Arbitration of the International Chamber of Commerce in 2009 and 2011, the United States District Court for the District of Delaware in 2012, the Superior Court for San Francisco County in 2013, the Patent Trial and Appeal Board at the United States Patent and Trademark Office in 2013 and the California First District Court of Appeal in 2014.

In the second quarter of 2014, the arbitration panel awarded Tessera $113 million plus interest for these past royalties due under the License Agreement. In October 2014, the Superior Court for San Francisco County formally confirmed the arbitration panel's award and entered judgment against Amkor for $128 million plus post-judgment interest at 10% per annum. In November 2014, the California First District Court of Appeal affirmed the Superior Court’s ruling.

In January 2015, the parties entered into a settlement agreement to end all pending proceedings related to the dispute. Under the terms of the settlement, Amkor agreed to pay Tessera a total of $155.0 million in 16 equal quarterly recurring payments commencing in the first quarter of 2015, and continuing through the fourth quarter of 2018, and the parties agreed to a mutual release and dismissal of all claims relating to their pending litigation and arbitration proceedings, including the previously awarded judgment of $128 million plus interest. The settlement agreement also provides that Tessera and Amkor will look for opportunities to engage in potential technology collaboration.

During the three months ended December 31, 2014, we recorded a pre-tax charge of $87.1 million, of which $75.3 million was charged to cost of sales and $11.8 million was charged to interest expense. This charge reflects the aggregate amount due under the settlement agreement, net of amounts previously reserved. At December 31, 2014, the liability was $136.9 million, which reflects the fair value as estimated by discounting the future cash flows using a rate that reflects the estimated rate at which we could obtain financing with similar terms. The remaining amount of the gross settlement charge of $18.1 million will be accreted through interest expense over the four year term of the arrangement to reflect the impact of the time value of money due to the long term nature of the obligation and related payment terms. The current portion is recorded in accrued expenses (Note 13) and the non-current portion is recorded in other non-current liabilities in our consolidated financial statements.

Leases

Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year are:

	Lease Payments
	(In thousands)
2015	$	13,116
2016	7,792
2017	6,336
2018	6,029
2019	6,194
Thereafter	12,624
Total	$	52,091

Rent expense amounted to $28.5 million, $23.8 million and $13.2 million for 2014, 2013 and 2012, respectively.

In order to provide packaging and test services, we purchase materials under various long-term supply contracts. Future minimum payments to be made under these contracts for the period 2015 through 2025 are $19.4 million.

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Business Acquisitions (Details)	12 Months Ended			1 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2014 Toshiba Electronics Malaysia [Member] USD ($)	Jul. 31, 2013 Toshiba Electronics Malaysia [Member] USD ($)	Dec. 31, 2014 Toshiba Electronics Malaysia [Member] USD ($)	Dec. 31, 2014 Toshiba Electronics Malaysia [Member] JPY (¥)
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Business Combination, Consideration Transferred					$ 61,200,000
Business Acquisition, Cost of Acquired Entity, Cash Paid					42,400,000
Final Installment Payment for Previous Acquisition	18,763,000	0	0	18,800,000
Cap on Future Royalty Payments						$ 13,000,000	¥ 1,500,000,000

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Pension and Severance Plans (Tables)

12 Months Ended

Dec. 31, 2014

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule Of Accrued Severance Obligation

The changes to the balance of our severance accrual are as follows:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Balance at the beginning of year	$	145,373		$	126,762		$	106,715
Provision of severance benefits	17,593			26,550			19,667
Severance payments	(10,160		)	(10,402		)	(8,520		)
(Gain) loss on foreign currency	(5,926		)	2,463			8,900
	146,880			145,373			126,762
Payments remaining with the National Pension Fund	(219		)	(241		)	(249		)
Total severance obligation balance at the end of year	146,661			145,132			126,513
Less current portion of accrued severance obligation (Note 13)	13,226			11,197			9,516
Non-current portion of severance obligation	$	133,435		$	133,935		$	116,997

Schedule of Changes in Projected Benefit Obligations and Fair Value of Plan Assets

The following table summarizes the Plans’ benefit obligations, fair value of the Plans’ assets and the funded status of the Plans at December 31, 2014 and 2013.

	For the Year Ended December 31,
	2014			2013
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	81,572		$	80,528
Service cost	5,042			5,909
Interest cost	3,051			3,170
Benefits paid	(2,620		)	(1,602		)
Actuarial losses (gains)	3,514			(2,513		)
Acquisition (Note 3)	—			13,017
Divestiture (Note 4)	(14,814		)	—
Effects of curtailment	—			(176		)
Settlement	—			(8,701		)
Foreign exchange gain	(1,736		)	(8,060		)
Projected benefit obligation at end of year	74,009			81,572
Change in plan assets:
Fair value of plan assets at beginning of year	50,304			58,146
Actual gain on plan assets	4,149			5,159
Employer contributions	3,756			1,120
Settlement	—			(8,701		)
Benefits paid	(2,620		)	(1,602		)
Foreign exchange loss	(818		)	(3,818		)
Fair value of plan assets at end of year	54,771			50,304
Funded status of the Plans at end of year	$	(19,238	)	$	(31,268	)

Schedule of Amounts Recognized in Balance Sheet

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The following table summarizes, by component, the change in accumulated other comprehensive income related to our Plans:

	Prior Service Cost		Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2012, net of tax	$	188	$	(5,561	)	$	(5,373	)
Amortization included in net periodic pension cost	250		114			364
Net gain arising during period	—		3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	250		4,110			4,360
Balance at December 31, 2013, net of tax	$	438	$	(1,451	)	$	(1,013	)
Amortization included in net periodic pension cost	102		110			212
Net gain arising during period	—		(1,724		)	(1,724		)
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income	102		(1,614		)	(1,512		)
Balance at December 31, 2014, net of tax	$	540	$	(3,065	)	$	(2,525	)
Estimated amortization of cost to be included in 2015 net periodic pension cost	$	34	$	84		$	118

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

Information for pension plans with benefit obligations in excess of plan assets are as follows:

	December 31,
	2014		2013
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	74,044	$	73,326
Aggregate fair value of plan assets	54,771		41,957
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	11,854		24,877
Aggregate fair value of plan assets	—		—

Components of net periodic pension cost

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2014			2013			2012
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,042		$	5,909		$	6,362
Interest cost	3,051			3,170			3,270
Expected return on plan assets	(3,094		)	(3,508		)	(3,188		)
Amortization of prior service cost	116			231			291
Recognized actuarial loss	141			142			225
Net periodic pension cost	5,256			5,944			6,960
Curtailment (gain) loss	—			(176		)	1,089
Settlement loss (gain)	97			(120		)	(100		)
Total pension expense	$	5,353		$	5,648		$	7,949

Schedule of Assumptions Used

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligation at December 31, 2014, 2013 and 2012:

	For the Year Ended December 31,
	2014		2013		2012
Discount rate for determining net periodic pension cost	3.9	%	3.9	%	4.2	%
Discount rate for determining benefit obligations at year end	4.2	%	3.9	%	4.0	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.1	%	4.5	%
Rate of compensation increase for determining benefit obligations at year end	4.7	%	4.1	%	4.1	%
Expected rate of return on plan assets for determining net periodic pension cost	6.2	%	6.3	%	6.3	%

Schedule of Allocation of Plan Assets

The fair value of our pension plan assets at December 31, 2014, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	5,742	$	—	$	5,742
Equity securities
Foreign securities	3,035		—		3,035
U.S. securities	19,790		—		19,790
	22,825		—		22,825
U.S. fixed income funds	4,321		—		4,321
Bonds
U.S. government bonds	—		2,840		2,840
Foreign treasury notes	10,156		—		10,156
	10,156		2,840		12,996
Taiwan retirement fund	8,632		—		8,632
Other	—		255		255
Total	$	51,676	$	3,095	$	54,771

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 17, is as follows:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
	(In thousands)
Cash and cash equivalents	$	4,542	$	—	$	4,542
Equity securities
Foreign securities	1,950		—		1,950
U.S. securities	18,223		—		18,223
	20,173		—		20,173
U.S. fixed income funds	4,186		—		4,186
Bonds
U.S. government bonds	—		2,087		2,087
Foreign treasury notes	10,374		—		10,374
	10,374		2,087		12,461
Taiwan retirement fund	8,840		—		8,840
Other	—		102		102
Total	$	48,115	$	2,189	$	50,304

Schedule of Expected Benefit Payments

The estimated future benefit payments related to our foreign defined benefit plans are as follows:

	Payments
	(In thousands)
2015	$	1,384
2016	2,019
2017	1,869
2018	2,430
2019	3,710
2020 to 2024	28,694

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amkor stockholders' equity:
Preferred stock designated Series A, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock designated Series A, shares authorized (in shares)	10,000	10,000
Preferred stock designated Series A, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	500,000	500,000
Common stock, shares issued (in shares)	282,231	262,109
Common stock, shares outstanding (in shares)	236,627	216,702
Treasury stock, shares	45,604	45,407

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Commitments and Contingencies (Details) (USD $)	1 Months Ended		3 Months Ended	48 Months Ended
	Oct. 31, 2014	May 31, 2014	Dec. 31, 2014	Dec. 31, 2018	Oct. 01, 2014	Sep. 30, 2014
Loss Contingencies [Line Items]
Other Commitment			$ 19,400,000
Tessera Inc Legal Proceedings [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	128,000,000	113,000,000
Loss Contingency, Interest Rate Post-Judgment					10.00%
Litigation Settlement, Expense			87,100,000
Liabilities			136,900,000
Tessera Inc Legal Proceedings [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount				155,000,000
Number of Quarterly Settlement Payments				16
Litigation Settlement Interest				18,100,000
Cost of Sales [Member] | Tessera Inc Legal Proceedings [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense			75,300,000
Interest Expense [Member] | Tessera Inc Legal Proceedings [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense			11,800,000
Letter of Credit [Member]
Loss Contingencies [Line Items]
Credit facility, borrowing capacity			25,000,000.0
Available letter of credit subfacility utilized			400,000
Letter of credit sublimit facility remaining			24,600,000
Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Credit facility, borrowing capacity			$ 200,000,000			$ 150,000,000

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New Accounting Standards

12 Months Ended

Dec. 31, 2014

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards

2. New Accounting Standards

Recently Adopted Standards

In March 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-05, Parent's Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (Topic 830). ASU 2013-05 provides guidance to resolve the diversity in practice regarding the release into net income of the cumulative translation adjustment when a company sells or ceases to hold a controlling interest in a subsidiary or group of assets within a foreign entity. This ASU is effective for reporting periods beginning after December 15, 2013. ASU 2013-05 was adopted on January 1, 2014. On June 30, 2014, we sold our controlling interest in a foreign subsidiary. The sale resulted in a gain upon release of the cumulative translation adjustment associated with the entity (Note 4).

Recently Issued Standards

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and changes in judgments. ASU 2014-09 is effective for reporting periods beginning after December 15, 2016, and permits the use of either full retrospective or modified retrospective methods of adoption. Early adoption is not permitted. We are currently evaluating the method of adoption and the impact that this guidance will have on our financial statements and disclosure.

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Income Taxes (Reconciliation of effective tax rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation between statutory rate and income tax provision
U.S. federal tax at 35%	$ 47,627	$ 43,396	$ 18,939
State taxes, net of federal benefit	1,940	1,124	1,126
Foreign income taxed at different rates	6,579	(17,814)	(14,717)
Foreign exchange (loss) gain	(17,321)	844	12,329
Change in valuation allowance	(13,527)	(32,415)	(3,112)
Adjustments related to prior years	3,643	2,727	(2,464)
Income tax credits generated	(2,557)	(2,622)	(1,370)
Repatriation of foreign earnings and profits	3,958	6,499	3,240
Expiration of capital loss carryforward	0	15,555	0
Effective Income Tax Rate Reconciliation, Expiration of Net Operating Losses	2,534	0	0
Equity in earnings of J-Devices	0	0	2,404
Debt conversion costs	0	4,067	0
Other	969	1,285	626
Income tax expense	$ 33,845	$ 22,646	$ 17,001
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%

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Pension and Severance Plans (Impact on Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	$ (1,013)	$ (5,373)
Amortization included in net periodic pension cost, net of tax	212	364
Net gain arising during period, net of tax	(1,724)	3,996
Unrecognized pension costs, end of year	(2,525)	(1,013)	(5,373)
Estimated amortization of cost to be included in 2012 net periodic pension cost	118
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(1,512)	4,360	5,137
Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	438	188
Amortization included in net periodic pension cost, net of tax	102	250
Net gain arising during period, net of tax	0	0
Unrecognized pension costs, end of year	540	438
Estimated amortization of cost to be included in 2012 net periodic pension cost	34
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	102	250
Actuarial Net Gain Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	(1,451)	(5,561)
Amortization included in net periodic pension cost, net of tax	110	114
Net gain arising during period, net of tax	(1,724)	3,996
Unrecognized pension costs, end of year	(3,065)	(1,451)
Estimated amortization of cost to be included in 2012 net periodic pension cost	84
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ (1,614)	$ 4,110

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Property, Plant and Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Acquisitions and Disposals [Line Items]
Depreciation	$ 463.5	$ 406.7	$ 366.6
KOREA, REPUBLIC OF
Significant Acquisitions and Disposals [Line Items]
Accumulated Capitalized Interest Costs	$ 8.6	$ 1.7

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Business Segments

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Business Segments, Customer Concentrations and Geographic Information

19. Business Segments, Customer Concentrations and Geographic Information

We operate as a single operating segment as managed by our Chief Executive Officer, who is considered our chief operating decision maker ("CODM"). The CODM bears the ultimate responsibility for, and is actively engaged in, the allocation of resources and the evaluation of our operating and financial results. We have concluded that we have a single operating segment based on the following:

• We are managed under a functionally-based organizational structure with the head of each function reporting directly to the CODM;

• We assess performance, including incentive compensation, based on consolidated operating performance and financial results;

• Our CODM allocates resources and makes other operating decisions based on specific customer business opportunities and

• We have an integrated process for the design, development and manufacturing services we provide to all of our customers. We also have centralized sales and administrative functions.

The following table presents net sales by product group:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
Advanced products	$	1,552,948	$	1,451,664	$	1,302,145
Mainstream products	1,576,492		1,504,786		1,457,401
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

The following table presents net sales by country based on customer location:

	Net Sales for the Year Ended December 31,
	2014		2013		2012
	(In thousands)
China	$	270,282	$	47,202	$	28,641
Ireland	175,095		97,180		110,529
Japan	268,420		394,834		349,360
Singapore	432,942		496,601		452,737
Taiwan	212,719		144,825		99,047
Thailand	104,608		116,376		139,134
Other foreign countries	533,951		454,218		437,148
Total foreign countries	1,998,017		1,751,236		1,616,596
United States	1,131,423		1,205,214		1,142,950
Total net sales	$	3,129,440	$	2,956,450	$	2,759,546

One customer accounted for 17.5%, 23.7% and 21.3% of consolidated net sales in 2014, 2013 and 2012, respectively. Another customer accounted for 13.2% and 10.5% of consolidated net sales in 2014 and 2013, respectively.

The following table presents property, plant and equipment, net, based on the physical location of the asset:

	Property, Plant and Equipment, Net at December 31,
	2014		2013
	(In thousands)
China	$	575,207	$	524,967
Japan	145		10,799
Korea	948,192		916,777
Malaysia	50,137		61,080
Philippines	301,291		240,187
Taiwan	317,192		236,178
Other foreign countries	293		93
Total foreign countries	2,192,457		1,990,081
United States	14,019		16,472
Total property, plant and equipment, net	$	2,206,476	$	2,006,553

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Debt Additional (Details) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Mar. 31, 2013	Apr. 30, 2013	Apr. 30, 2009	Sep. 30, 2014	Jun. 30, 2012
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due December 2019
Debt Instrument [Line Items]
Description of variable rate basis	LIBOR plus 3.70%
Debt Instrument, Basis Spread on Variable Rate	3.70%
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)
Debt Instrument [Line Items]
Description of variable rate basis	foreign currency funding-linked base rate plus 1.75%
Debt Instrument, Basis Spread on Variable Rate	1.75%
Credit facility, borrowing capacity			$ 150,000,000.0
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (6)
Debt Instrument [Line Items]
Description of variable rate basis	LIBOR plus 3.7%
Debt Instrument, Basis Spread on Variable Rate	3.70%
Interest rate	3.70%	3.70%
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due June 2016 (4)
Debt Instrument [Line Items]
Description of variable rate basis	LIBOR plus 3.70%
Debt Instrument, Basis Spread on Variable Rate	3.70%
Credit facility, borrowing capacity				150,000,000.0
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015
Debt Instrument [Line Items]
Description of variable rate basis	foreign currency funding-linked rate plus 2.30%
Debt Instrument, Basis Spread on Variable Rate	2.30%
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 2.00%, due March 2017 (5)
Debt Instrument [Line Items]
Description of variable rate basis	foreign currency funding-linked base rate plus 2.00%
Debt Instrument, Basis Spread on Variable Rate	2.00%
Interest rate	1.80%	1.80%
Senior Notes [Member] | 6.375% Senior notes, due October 2022
Debt Instrument [Line Items]
Interest rate	6.375%	6.375%
Senior Notes [Member] | 6.625% Senior notes, due June 2021, $75 million related party
Debt Instrument [Line Items]
Interest rate	6.625%	6.625%
Face amount, related party	75,000,000	75,000,000
Senior Notes [Member] | 7.375% Senior notes, due May 2018
Debt Instrument [Line Items]
Interest rate	7.375%	7.375%
Convertible Subordinated Debt [Member] | 6.0% Convertible senior subordinated notes, due April 2014 (2)
Debt Instrument [Line Items]
Interest rate	6.00%	6.00%			6.00%
Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Description of variable rate basis	LIBOR plus 1.25%-1.75%
Credit facility, borrowing capacity	200,000,000	200,000,000				150,000,000
Line of Credit Facility, Current Borrowing Capacity	200,000,000	200,000,000
Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%
Interest rate	1.25%	1.25%
Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Interest rate	1.75%	1.75%
Revolving Credit Facility [Member] | Line of Credit [Member] | KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 2.00%, due June 2016 (3)
Debt Instrument [Line Items]
Description of variable rate basis	foreign currency funding-linked base rate plus 2.00%
Debt Instrument, Basis Spread on Variable Rate	2.00%
Credit facility, borrowing capacity	41,000,000.0	41,000,000.0					41,000,000
Revolving Credit Facility [Member] | Line of Credit [Member] | TAIWAN, PROVINCE OF CHINA | Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (8)
Debt Instrument [Line Items]
Description of variable rate basis	TAIFX plus a bank-determined spread
Credit facility, borrowing capacity	44,000,000.0	44,000,000.0

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Uncategorized Items
[us-gaap_TreasuryStockShares]	28,731,000

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Investments (Tables)

12 Months Ended

Dec. 31, 2014

Equity Method Investments and Joint Ventures [Abstract]

Investments

Investments consist of the following:

	December 31,
	2014				2013
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	117,733	60.0	%	$	105,214	60.0	%

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Investments

12 Months Ended

Dec. 31, 2014

Equity Method Investments and Joint Ventures [Abstract]

Investments

12. Investments

Investments consist of the following:

	December 31,
	2014				2013
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	117,733	60.0	%	$	105,214	60.0	%

J-Devices Corporation

In October 2009, Amkor and Toshiba invested in Nakaya Microdevices Corporation (“NMD”) and formed a joint venture to provide semiconductor packaging and test services in Japan. As a result of the transaction, NMD changed its name to J-Devices Corporation. We invested $16.7 million for our original 30% equity interest and options to acquire additional equity interests. We exercised our options and increased our ownership interest in J-Devices from 30% to 60% in April 2013, for an aggregate purchase price of $67.4 million, and from 60% to 65.7% in January 2015, for an aggregate purchase price of $12.9 million. J-Devices is now owned 65.7% by Amkor and 34.3% by the former shareholders of NMD.

The remaining option is exercisable at our discretion and permits us to increase our ownership interest in J-Devices up to 80% in 2015 and thereafter by purchasing shares owned by the other shareholders. The option becomes exercisable in the fourth quarter of 2015, and if exercised, we would expect closing to occur in the first half of the following year, subject to regulatory approval. After we own 80% or more shares, the original shareholders of NMD have a put option which allows them to sell their shares to us. The exercise price for all options is payable in cash and is determined using a formula based on the net book value and a multiple of earnings before interest, taxes, depreciation and amortization of J-Devices.

The governance provisions currently applicable to J-Devices restrict our ability, even with our majority ownership, to cause J-Devices to take certain actions without the consent of the other investors. Accordingly, we account for our investment in J-Devices using the equity method of accounting. Under the equity method of accounting, we recognize our proportionate share of J-Devices’ net income or loss, which is after J-Devices' income taxes in Japan, during each accounting period as a change in our investment in unconsolidated affiliate. J-Devices' financial information is converted to U.S. GAAP and translated into U.S. dollars using Japanese yen as the functional currency. In addition, we record equity method adjustments as a change in our investment. The equity method adjustments include the amortization of basis differences as a result of the cost of our investment differing from our proportionate share of J-Devices' equity.

On June 30, 2014, J-Devices purchased 100% of the shares of our previously wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan. For additional information regarding this transaction, we refer you to Note 4.

Our share of the undistributed retained earnings of J-Devices amounted to approximately $63.5 million and $31.8 million as of December 31, 2014 and 2013, respectively.