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, 2013

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)

1900 South Price Road

Chandler, AZ 85286

(480) 821-5000

(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 o     No þ

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.  o

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 o	Accelerated filer þ	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, 2013, based upon the closing price of the common stock as reported by the NASDAQ Global Select Market on that date, was approximately $330.5 million.

The number of shares outstanding of each of the issuer’s classes of common equity, as of January 31, 2014, was as follows: 217,901,240 shares of Common Stock, $0.001 par value.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the registrant’s Proxy Statement relating to its 2014 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	17
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	94
Item 9A.	Controls and Procedures	94
Item 9B.	Other Information	95
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	95
Item 11.	Executive Compensation	95
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	96
Item 13.	Certain Relationships and Related Transactions and Director Independence	96
Item 14.	Principal Accountant Fees and Services	96
PART IV
Item 15.	Exhibits and Financial Statement Schedules	96

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. Amounts preceded by ₩ are in Korean won, and 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 2014 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, (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 our enterprise resource planning (“ERP”) system and other systems, (15) our view of the outcome of our dispute with Tessera and our estimates regarding the possible amount of, and funding for, any payments due in conjunction with such dispute, (16) the anticipated schedule for construction of our new factory and research and development facility in Korea, (17) our plan to increase our ownership of J-Devices and consolidation of J-Devices' results into our consolidated financial statements, (18) our expected forfeiture rate for outstanding stock options and restricted shares, (19) our expected rate of return for pension plan assets and (20) 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; Broadcom Corporation; LSI 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 web 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 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 technologies provide increased value to our customers while typically generating gross margins above the corporate average. This is particularly true in the mobile device market, where growth has outpaced the 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 invested hundreds of millions of dollars on 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 have achieved technology leadership in areas such as fine pitch bumping, advanced flip chip and wafer-level processing. During 2013, 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 NAND memory. 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 creates capacity to provide incremental packaging and test services without significant additional investment. As part of our strategy, we are focused on developing a second wave of customers for these assets. For example, we have a concerted effort to increase our sales to Chinese and Taiwanese fabless

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

Also in 2013, we began efforts to seek out and engage new customers in the analog area for our mainstream wirebond technologies. Another area of expanded emphasis is the automotive market where semiconductor content continues to grow. These efforts to enlarge our customer base will increase in 2014 as we target these and other customers to grow our revenue and improve the utilization of our existing assets.

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 2009 we invested in J-Devices Corporation, a joint venture to provide semiconductor packaging and test services in Japan. In 2013, we increased our investment in J-Devices to 60%. Together with J-Devices, we are pursuing a consolidate and fill strategy with IDM customers in Japan, and we believe our increasing engagement with J-Devices will improve our revenues, particularly in the automotive market. 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 existing customer, Toshiba, we expect this acquisition to attract new customers.

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. We expect to continue to evaluate these types of opportunities in 2014.

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. 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 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 electroplated 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 stacking technologies, 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.

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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.

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, representing one of the broadest package offerings in the semiconductor industry. 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 of six million square feet of space 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.

Competitive Cost Structure and Disciplined Capital Investment

There has been a continuous push throughout the entire semiconductor supply chain for lower cost solutions. A competitive cost structure and disciplined capital investment decisions enable us to provide cost-competitive solutions while achieving profitability and generating cash flow. Some of our cost control efforts have included: (1) increasing strip densities to drive higher throughput; (2) migrating from capillary underfill to molded underfill; (3) developing thinner and shorter gold wire solutions; (4) migrating from gold wire to copper wire for certain wirebond packages; (5) reducing test cycle times and (6) increasing labor productivity.

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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.

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 and copper clip 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.

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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.

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,
	2013				2012				2011
	(In millions, except percentage of net sales)
Advanced products	$	1,451	49.1	%	$	1,302	47.2	%	$	1,125	40.5	%
Mainstream products	1,505		50.9	%	1,458		52.8	%	1,651		59.5	%
Total net sales	$	2,956	100.0	%	$	2,760	100.0	%	$	2,776	100.0	%

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Advanced Products

Our advanced packages consist of flip chip chip scale packages, and flip chip ball grid array packages. These package families use flip chip interconnect technology to connect a die to a substrate package carrier.

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 the package of choice for a wide variety of applications that require very small form factors such as wireless handsets and mobile consumer electronic devices.

Flip chip stacked chip scale (FC SCSP) packages stack a second die on top of the original die in a FC CSP package. The top die is typically memory, 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 packaging 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.

Mainstream Packages

Our mainstream packages consist of 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.

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.

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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 chip scale packages (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 interconnect density 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.

System-in-Package (SiP) Modules: SiP modules contain one or more die plus passive components 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 include inductors, capacitors, resistors, filters and diplexers. SiP modules are used in mobile devices for components such as fingerprint sensors, radio frequency controllers, power amplifiers, GPS modules, Bluetooth modules, digital basebands and hard drive controllers.

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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 Flip Chip Stacked Chip Scale Package Wafer Level Chip Scale Package MicroLeadFrame ChipArray Ball Grid Array Fine Pitch Copper Pillar Flip Chip Chip Scale Package
Consumer	Television Set Top Boxes Gaming Portable Media Digital Cameras	Flip Chip Ball Grid Array Thin Quad Flat Pack ChipArray Ball Grid Array Digital Micromirror Device MicroLeadFrame Plastic Ball Grid Array
Networking	Servers Routers Switches	Flip Chip Ball Grid Array Plastic Ball Grid Array MicroLeadFrame Thin Quad Flat Pack ChipArray Ball Grid Array
Automotive and Industrial	Infotainment Safety Performance, Fuel Efficiency and Environmental Sustainability Comfort, Aesthetics and Security	Small Outline Integrated Circuit MicroLeadFrame Plastic Ball Grid Array Thin Quad Flat Pack Thin Shrink Small Outline Package Quad Flat Pack
Computing	Desk Top Computer Laptop Computer Notebook Computer Netbook Computer Hard Disk Drive Printers and Other Peripherals Computer Server	MicroLeadFrame ChipArray Ball Grid Array Thin Quad Flat Pack Flip Chip Ball Grid Array Small Outline Integrated Circuit Stacked Chip Scale Package Flip Chip Chip Scale Package

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 $0.8 billion in 2013. 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 and the purchase of three additional packaging and test facilities in 2013 from Renesas.

In 2013, we completed the exercise of our option to increase our ownership interest in J-Devices from 30% to 60%. As a result of this transaction, J-Devices is now owned 60% by Amkor, 34% by the former shareholders of NMD and 6% by Toshiba. 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 additional options to increase our ownership interest to 80% by 2016, at which time

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certain governance restrictions will lapse and we will 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. In addition, we leverage our research and development by licensing our leading edge technology, such as MicroLeadFrame, Fine Pitch Copper Pillar Flip Chip, TMV, Lead Free and Copper Pillar Bumping and FusionQuad.

Our areas for research and development include:

• 2.5D and 3D packaging;

• Advanced flip chip packaging;

• Advanced micro-electromechanical system packaging and testing;

• Advanced Package-on-Package (PoP);

• Copper Pillar bumping and packaging;

• Copper wire interconnects;

• Embedded Die / Fan Out technology;

• Engineering and characterization tools;

• High density laminate and leadframe packaging;

• Manufacturing cost reductions;

• Silicon Photonics;

• Silver wirebond interconnects;

• TMV technology;

• TSV technology and

• Wafer-level processing.

We have key development partners within our customer and supplier base. We work with our partners and allocate our resources to develop applications that have promising potential for a healthy return on investment.

As of December 31, 2013, we had approximately 400 employees engaged in research and development activities. In 2013, 2012 and 2011, we incurred $64.6 million, $54.1 million and $50.4 million, respectively, of research and development expense.

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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.

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, 2013, we had approximately 200 customers, including many of the largest semiconductor companies in the world. Our ten largest customers accounted for 62.9% of our net sales in 2013. Qualcomm Incorporated and Toshiba each accounted for more than 10% of our net sales in 2013.

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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 order and installation than other packaging equipment and is sold in relatively larger increments of capacity.

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.

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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 companies (including semiconductor 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.

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.

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EMPLOYEES

As of December 31, 2013, we had approximately 20,900 full-time employees. Of the total employee population, approximately 15,400 were engaged in manufacturing services, 3,300 were engaged in manufacturing support, 400 were engaged in research and development, 300 were engaged in marketing and sales and 1,500 were engaged in administration, business management and finance. 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, the Philippines, Taiwan and the U.S. are not represented by any union. Certain employees at our factories in China, Japan, Korea and Malaysia are members of a union, and we operate subject to collective bargaining agreements that we have entered into with the unions in Japan, Korea and Malaysia.

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 consumer electronic products, telecommunication devices or computing devices, 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.

Also, the action or inaction of the U.S. government relating to federal income tax increases, 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 in response to market conditions and our ability to control our costs including labor, material, overhead and financing costs.

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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;

• evolving packaging and test technology and potential difficulties in developing and transitioning to new technologies;

• absence of backlog, the short-term nature of our customers’ commitments 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;

• 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;

• 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

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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, 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. For example, we experienced lower than optimum utilization in late 2008 and in 2009 due to a decline in world-wide demand for our packaging and test services which impacted our gross margin. 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.

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.

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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 IDMs. 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.

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, 2013, our total debt balance was $1,652.7 million, of which $61.4 million was classified as a current liability and $320.0 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;

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• 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 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 $566.3 million in 2013. 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 any firm customer commitments. Ultimately the actual amount of our capital expenditures for 2014 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 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 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.

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

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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 $145.1 million as of December 31, 2013. 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 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 to 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 enterprise resource planning (“ERP”) system in a multi-year program on a world-wide basis. We have recently implemented several significant ERP modules and expect to implement additional ERP modules in the future. In addition, we are implementing a new shop floor management system in certain of our factories. The implementation of the ERP and shop floor systems represents a change in our internal control over financial reporting.

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Although we continue to monitor and assess our internal controls in the new ERP system environment and the shop floor system as changes are made and new modules are implemented, there is a risk that deficiencies may occur that could constitute significant deficiencies or in the aggregate a material weakness.

In addition, on July 31, 2013, we completed our acquisition of Amkor Technology Malaysia Sdn. Bhd. We are continuing to integrate the acquired operations into our overall internal control over financial reporting. Although we have extended our oversight and monitoring processes that support internal control over financial reporting to include the acquired 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.

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;

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• 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 are implementing a new shop floor system in certain of our factories. In July 2013, we acquired a factory in Malaysia, and have begun to integrate 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

• 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;

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• 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%, which we completed in April 2013 and we have additional options to increase our ownership over time to as much as 80%. We have begun integration of 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 will need to integrate with its operations the acquisitions it has recently completed. 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 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 electronic industry supply chain 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

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from the conflict areas. We may incur additional costs associated with complying with the new requirements and customer initiatives. These new 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.

Customer Concentration and Loss of Customers — The Loss of Certain Customers or Reduced Pricing or Orders 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 62.9% of our net sales in 2013. One customer accounted for 23.7% and another customer accounted for 10.5% of net sales in 2013. 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, 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.

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.

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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 $566.3 million in 2013, $533.5 million in 2012 and $466.7 million in 2011. 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;

• 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.

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.

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Litigation Incident to Our Business Could Adversely Affect Us.

We have been a party to various legal proceedings, including those described in Note 19 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 Law 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 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 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 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 expenses will increase as income from those jurisdictions become 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 design 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.

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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 legal proceeding filed by and against Tessera, Inc. and the complaint filed and ongoing proceeding against Carsem (M) Sdn Bhd, Carsem Semiconductor Sdn Bhd, and Carsem Inc., or collectively “Carsem”, which are described in more detail in Note 19 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 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.

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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.

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 imposes 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

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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 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.

Continued Control By Existing Stockholders — 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, 2013, Mr. James J. Kim, the Executive Chairman of our Board of Directors, members of Mr. Kim’s immediate family and affiliates owned approximately 137.5 million shares, or approximately 63%, 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 63% 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 no principal amount of the 2014 Notes remains outstanding and 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	1,221,000
Seoul, Korea	668,000
Pupyong, Korea (1)	448,000
Philippines
Muntinlupa, Philippines (2)	661,000
Province of Laguna, Philippines (2)	629,000
China
Shanghai, China (3)	887,000
Taiwan
Hsinchu, Taiwan	489,000
Lung Tan, Taiwan	353,000
Malaysia
Telok Panglima Garang, Malaysia (3)	377,000
Japan
Kitakami, Japan (4)	207,000

(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 661,000 square feet of building space.

(3) Land is leased.

(4) Leased facility.

During 2013, we purchased land for a factory and research and development center in Korea. The agreement to purchase the land for the facility is subject to our compliance with various construction, investment, hiring, regulatory and other requirements. We anticipate beginning construction of our new factory and research and development center in late 2014. Construction work will continue through 2015 and into early 2016. There can be no assurance that the new facility will proceed at all, or that the actual scope, costs, timeline or benefits of the project will be consistent with our current expectations.

Our principal executive office and operational headquarters is located in Chandler, Arizona. In addition to executive staff, the Chandler, 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. (Chandler, 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 are 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 19 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
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
2012
First Quarter	$	6.78	$	4.46
Second Quarter	6.25		4.29
Third Quarter	5.58		4.36
Fourth Quarter	4.60		3.65

There were approximately 146 holders of record of our common stock as of January 31, 2014.

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, 2013. We refer you to Note 17 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K for further discussion.

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	1,597	$	4.42	—	$	91,586,032
November 1-November 30	39,750	5.35		—	91,586,032
December 1-December 31	2,021	5.86		—	91,586,032
Total	43,368	$	5.34	—

(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, we made no common stock purchases, and at December 31, 2013, 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.

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Item 6. Selected Consolidated Financial Data

The following selected consolidated financial data as of December 31, 2013 and 2012, and for the years ended December 31, 2013, 2012 and 2011, 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, 2011, 2010 and 2009, and for the years ended December 31, 2010 and 2009, have been derived from audited financial statements not included herein. 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. 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,
	2013		2012		2011		2010		2009
	(In thousands, except per share data)
Income Statement Data:
Net sales	$	2,956,450	$	2,759,546	$	2,776,359	$	2,939,483	$	2,179,109
Gross profit (a)	544,513		423,810		490,569		663,756		480,396
Operating income	232,109		152,692		193,670		373,798		225,317
Loss (gain) on debt retirement, net (b)	12,330		1,199		15,531		18,042		(15,088		)
Income tax expense (benefit) (c)	22,646		17,001		7,124		19,012		(29,760		)
Equity in earnings of J-Devices	10,316		5,592		7,085		6,435		2,373
Net income	111,657		42,702		93,095		232,147		156,283
Net income attributable to Amkor	109,296		41,818		91,808		231,971		155,980
Net income attributable to Amkor per common share:
Basic	$	0.58	$	0.26	$	0.48	$	1.26	$	0.85
Diluted	$	0.50	$	0.24	$	0.39	$	0.91	$	0.67
Other Financial Data:
Depreciation and amortization	$	410,346	$	370,479	$	335,644	$	323,608	$	305,510
Purchases of property, plant and equipment	566,256		533,512		466,694		445,669		173,496
Balance Sheet Data:
Cash and cash equivalents	$	610,442	$	413,048	$	434,631	$	404,998	$	395,406
Working capital	541,480		438,781		354,644		289,859		327,088
Total assets	3,427,298		3,025,215		2,773,047		2,736,822		2,432,909
Non-current liabilities, including debt	1,771,422		1,705,794		1,429,640		1,327,933		1,437,371
Total Amkor stockholders’ equity	953,740		657,955		693,266		630,013		383,209

(a) During 2013 and 2012, we recorded a charge of $10.0 million and $50.0 million, respectively, to cost of sales relating to our pending patent license litigation.

(b) During 2013, we exchanged debt for shares of our common stock and a cash payment and 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) Generally, our effective tax rate is substantially below the U.S. federal tax rate of 35% because we have experienced taxable losses in the U.S. and our income is taxed in foreign jurisdictions where we benefit from tax holidays or tax rates lower than the U.S. statutory rate. In 2009, a $25.6 million benefit for the release of a valuation allowance in Korea was included in the income tax benefit.

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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: leveraging our investment 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 the corporate average. This is particularly true in the mobile device market, where growth has outpaced the 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.

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 creates capacity to provide incremental packaging and test services without significant additional investment. As part of our strategy, we are focused on developing a second wave of customers for these assets. For example, we have a concerted effort to increase our sales to Chinese and Taiwanese fabless chip companies, since they dominate the mid-tier and entry-level segments of the mobile device market where most of the growth is occurring. Also in 2013, we began efforts to seek out and engage new customers in the analog area for our mainstream wirebond technologies. Another area of expanded emphasis is the automotive market where semiconductor content continues to grow. These efforts to enlarge our customer base will increase in 2014 as we target these and other customers to grow our revenue and improve the utilization of our existing assets.

From time to time we also see attractive opportunities to grow our customer base and expand markets. For example, in 2009 we invested in J-Devices Corporation, a joint venture to provide semiconductor packaging and test services in Japan. In 2013, we increased our investment in J-Devices to 60%. 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 existing customer, Toshiba, we expect this acquisition to attract new customers. 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. We expect to continue to evaluate these opportunities in 2014.

Our IDM customers include: Intel Corporation; Micron Technology, Inc.; STMicroelectronics N.V.; Texas Instruments Incorporated and Toshiba Corporation. Our fabless customers include: Altera Corporation; Broadcom Corporation; LSI 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 generally made in advance of the related revenues and without any 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

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business, our capital expenditure levels and our ability to repay debt out of our operating cash flows or proceeds from debt or equity financings.

2013 Financial Highlights

Our net sales increased $196.9 million or 7.1% to $2,956.5 million in 2013 from $2,759.5 million in 2012. The increase was driven by strong demand for wafer-level processing, wirebond memory and flip chip services for mobile communications applications and 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.

Gross margin in 2013 increased to 18.4% from 15.4% in 2012. The increase in gross margin was primarily due to higher net sales and the improved mix of wafer-level processing, test, and NAND memory services. Gross margin also benefitted from lower costs for gold, which is used in many of our wirebond products. Our gross margin was negatively impacted by 0.4% percentage points in 2013 and 1.8% percentage points in 2012 for charges related to our pending patent license litigation.

Net cash provided by operating activities was $557.5 million for the year ended December 31, 2013, compared to $389.1 million for the year ended December 31, 2012. The increase is mainly attributed to higher net sales and improved profitability.

In 2013, our capital expenditures totaled $566.3 million or 19.2% of net sales compared to $533.5 million or 19.3% of net sales in 2012. Our 2013 capital expenditures were primarily driven by investments in packaging and test equipment supporting the communications end market, as well as the purchase of land relating to our planned factory and research and development center in Korea.

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,
	2013		2012		2011
Net sales	100.0	%	100.0	%	100.0	%
Materials	40.0	%	43.2	%	44.1	%
Labor	14.4	%	14.3	%	14.6	%
Other manufacturing costs	26.8	%	25.3	%	23.6	%
Patent license litigation	0.4	%	1.8	%	—	%
Gross margin	18.4	%	15.4	%	17.7	%
Operating income	7.9	%	5.5	%	7.0	%
Income before income taxes and equity in earnings of unconsolidated affiliate	4.2	%	2.0	%	3.4	%
Net income attributable to Amkor	3.7	%	1.5	%	3.3	%

Net Sales

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Net sales	$	2,956,450	$	2,759,546	$	2,776,359	$	196,904	7.1	%	$	(16,813	)	(0.6	)%

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 communication applications. The increase in net sales in 2013 was also driven by 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.

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The decrease in net sales in 2012 compared to 2011 was the result of weakness in the consumer, networking and automotive and industrial end markets. In particular, net sales for services related to home electronics and gaming were lower than historical levels due to insourcing by some of our IDM customers and lower demand for our wirebond services. These decreases were partially offset by strong demand for packaging and test services for mobile communication applications.

Unit volume increased to 12.9 billion units in 2013 from 8.5 billion units in 2012 primarily as a result of the addition of our newly acquired power discrete business in Malaysia, an increase in wafer-level processing services for mobile communication applications and higher demand for leadframe products. Unit volume increased to 8.5 billion units in 2012 from 8.1 billion units in 2011 primarily due to increases in wafer-level processing and flip chip chip scale services, partially offset by decreases in packaging for wirebond array and leadframe products.

Gross Margin

										Change
	2013			2012			2011			2013 over 2012			2012 over 2011
	(In thousands, except percentages)
Gross profit	$	544,513		$	423,810		$	490,569		$	120,703		$	(66,759	)
Gross margin	18.4		%	15.4		%	17.7		%	3.0		%	(2.3		)%

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 2013 increased compared to 2012. The increase in gross margin was primarily driven by higher net sales and the improved mix of wafer-level processing, test and NAND memory services. Gross margin also benefitted from lower costs for gold, which is used in many our wirebond products. Our gross margin was negatively impacted by 0.4% percentage points in 2013 and 1.8% percentage points in 2012 for charges related to our pending patent license litigation.

Gross margin in 2012 decreased compared to 2011. The decrease in gross margin was primarily due to weakness in demand for some of our wirebond products and the corresponding lower level of utilization of these manufacturing assets, charges for our pending patent license litigation and lower net sales due to insourcing by some of our IDM customers. These decreases were partially offset by increased net sales of flip chip, wafer-level processing and test services supporting mobile communications.

Selling, General and Administrative Expenses

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Selling, general and administrative	$	247,779	$	217,000	$	246,513	$	30,779	14.2	%	$	(29,513	)	(12.0	)%

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 pending litigation and acquisitions. Selling, general and administrative expenses decreased in 2012 compared to 2011. The decrease was primarily the result of reduced employee compensation costs and lower professional fees, partially offset by charges from our restructuring activities in 2012.

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Research and Development

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Research and development	$	64,625	$	54,118	$	50,386	$	10,507	19.4	%	$	3,732	7.4	%

Research and development activities are focused on developing new packaging and test services and improving the efficiency and capabilities of our existing production processes. Areas of focus include 2.5D and 3D packaging (including embedded die), silicon interposers and through silicon via technologies, fine pitch copper pillar packaging and wafer level processing in support of advanced wafer nodes.

Research and development expenses in 2013 increased compared to 2012 as a result of expanded development activities with strategic customers along with additional depreciation resulting from continued investments and higher employee compensation expense. Research and development expenses in 2012 increased compared to 2011 due to increased depreciation from research and development investments.

Other Income and Expense

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Interest expense, including related party	$	105,908	$	97,943	$	86,606	$	7,965	8.1	%	$	11,337		13.1	%
Other expense, net	2,214		638		13,930		1,576		247.0	%	(13,292		)	(95.4	)%
Total other expense, net	$	108,122	$	98,581	$	100,536	$	9,541	9.7	%	$	(1,955	)	(1.9	)%

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 of $193.7 million of our 6.0% Convertible Senior Subordinated Notes for shares of our common stock. As a result of this exchange transaction, we recorded a debt retirement charge in other expense of $11.6 million related to the cash payment we made to holders of the notes. This increase in other expense was partially offset by foreign currency gains at our subsidiaries. During 2013, we recorded a 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.

Interest expense in 2012 increased compared to 2011 due to $6.0 million of estimated interest related to our pending patent license litigation and higher levels of long-term debt. In 2011, we recorded a $15.5 million loss on debt retirement in other expense due to the refinancing of our 2.5% Convertible Senior Subordinated Notes due May 2011 and the full redemption of our 9.25% Senior Notes due 2016.

Income Tax Expense

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Income tax expense	$	22,646	$	17,001	$	7,124	$	5,645	33.2	%	$	9,877	138.6	%

Generally, our effective tax rate is substantially 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. Income tax expense in 2013, 2012 and 2011 is attributable to income tax on profits earned in certain foreign jurisdictions, foreign withholding taxes and minimum taxes. Income tax expense in 2012 and 2011 is also attributable to deferred taxes on undistributed earnings from our investment in J-Devices. The increase in income tax expense in 2013 compared to 2012 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 tax positions, partially offset by the release of

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a valuation allowance in a foreign jurisdiction and the utilization of previously unbenefitted net operating loss carryforwards. The increase in income tax expense in 2012 compared to 2011 is attributable to the increase in income tax rates in jurisdictions where tax holidays have partially expired and taxation in a jurisdiction that previously benefited from a net operating loss carryforward and taxation of foreign currency gains in connection with debt denominated in US dollars in a foreign jurisdiction.

During 2013, our subsidiaries in Korea, Malaysia, the Philippines and Taiwan operated under tax holidays which will continue to expire in whole or in part at various dates through 2022. We expect our effective tax rate to increase as the tax holidays expire, as income earned in these jurisdictions will be subject to higher statutory income tax rates. In connection with our land purchase in Korea in 2013, we intend to increase our capital in Korea within three 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 6 to our Consolidated Financial Statements included in Part II, Item 8 of this Annual Report on Form 10-K for further discussion of income tax holidays.

At December 31, 2013, we had U.S. net operating loss carryforwards totaling $342.8 million which expire at various times through 2033. Additionally, at December 31, 2013, we had $38.3 million of non-U.S. net operating loss carryforwards, which will expire at various times through 2022. We maintain a valuation allowance on all of our U.S. net deferred tax assets, including our net operating loss carryforwards, and on deferred tax assets in certain foreign jurisdictions. We will release such valuation allowances as the related tax benefits are realized on our tax returns or when sufficient net positive evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized.

Equity in Earnings of J-Devices

							Change
	2013		2012		2011		2013 over 2012				2012 over 2011
	(In thousands, except percentages)
Equity in earnings of J-Devices	$	10,316	$	5,592	$	7,085	$	4,724	84.5	%	$	(1,493	)	(21.1	)%

Our equity in earnings of J-Devices increased in 2013 compared with 2012 as a result of increasing our ownership interest in J-Devices from 30% to 60% in April 2013. The decrease in our equity in earnings of J-Devices in 2012 compared with 2011 was consistent with the decrease in J-Devices' net income.

Quarterly Results

The following table sets forth our unaudited consolidated financial data for the last eight quarters ended December 31, 2013. 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.

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 our pending patent license litigation. 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. We also recorded a charge of $30.0 million to cost of sales and $4.0 million to interest expense during the three months ended June 30, 2012, and an additional charge of $20.0 million to cost of sales and $2.0 million to interest expense during the three months ended December 31, 2012, related to our pending patent license litigation.

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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.

	For the Quarter Ended
	Dec. 31, 2013		Sept. 30, 2013		June 30, 2013			Mar. 31, 2013		Dec. 31, 2012		Sept. 30, 2012		June 30, 2012			Mar. 31, 2012
	(In thousands, except per share data)
Net sales	$	754,875	$	767,987	$	746,059		$	687,529	$	722,656	$	695,353	$	686,527		$	655,010
Gross profit	150,173		141,008		138,379			114,953		112,722		116,787		89,320			104,981
Operating income	74,554		58,014		58,453			41,088		42,409		54,018		21,964			34,301
Loss on debt retirement, net	711		—		11,619			—		1,199		—		—			—
Income tax expense (benefit)	16,685		12,170		(10,238		)	4,029		7,992		9,538		(3,891		)	3,362
Equity in earnings of J-Devices	5,637		3,179		1,445			55		171		2,541		892			1,988
Net income	41,558		26,004		30,329			13,766		7,672		22,576		872			11,582
Net income attributable to Amkor	40,838		25,349		29,727			13,382		7,146		22,317		581			11,774
Net income attributable to Amkor per common share:
Basic	$	0.19	$	0.12	$	0.18		$	0.09	$	0.05	$	0.14	$	—		$	0.07
Diluted	$	0.18	$	0.11	$	0.14		$	0.07	$	0.05	$	0.11	$	—		$	0.06

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. Thereafter, our liquidity will continue to be 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 final amount of payments due in our pending 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, 2013, we had cash and cash equivalents of $610.4 million, $1,652.7 million of debt and availability of $149.7 million under our $150.0 million first lien senior secured revolving credit facility. Additionally, our foreign subsidiaries had $70.0 million available to be drawn under secured revolving credit facilities for general corporate purposes, general working capital purposes and capital expenditures and $250.0 million available to be borrowed under secured term loan credit facilities for general working capital purposes, capital expenditures and repayment of inter-company debt.

Included in our cash balance as of December 31, 2013, is $292.5 million held offshore by our foreign subsidiaries. If we were to distribute this offshore cash to the U.S. as repatriated earnings of our foreign subsidiaries, we would incur up to $6.3 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.

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. If we decide to adopt a new plan, we would be required to fund a significant portion of the existing liability, which would provide a current tax deduction upon funding. Our Korean severance liability was $145.1 million as of December 31, 2013.

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We refer you to Note 19 to our Consolidated Financial Statements in Part II, Item 8 to this Annual Report on Form 10-K for a discussion of the pending litigation relating to Amkor's license agreement with Tessera. We expect to use cash on hand, proceeds from borrowings under our existing lines of credit or other sources to make any payments that become due in connection with our pending patent license litigation.

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 any firm customer commitments. Additionally, in April 2013, we completed the exercise of our option to increase our ownership interest of J-Devices, and in July 2013, we acquired Amkor Technology Malaysia Sdn. Bhd. We refer you to "Investments" below for further discussion.

In January 2013, we sold office space and land located in Chandler, Arizona for $22.8 million.

In May 2013, we issued an additional $225.0 million of 6.375% Senior Notes due October 2022 (the “Additional 2022 Notes”) under the same terms as the original $300.0 million of 6.375% Senior Notes due October 2022. The Additional 2022 Notes were issued at a premium of 103% or $6.8 million. The net proceeds from the issuance of the Additional 2022 Notes were designated for general corporate purposes.

In June 2013, we completed a tender offer for the 6.0% Convertible Senior Subordinated Notes due April 2014 (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. The cash payment was equivalent to the remaining coupons for the tendered notes.

Our scheduled principal repayments on debt include $61.4 million due in 2014, $85.0 million due in 2015, $70.0 million due in 2016, $90.0 million due in 2017, $345.0 million due in 2018 and $995.0 million due thereafter. We were in compliance with all of our debt covenants at December 31, 2013, and expect to remain in compliance with these covenants for at least the next twelve months.

In order to reduce leverage 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, including our convertible notes. These restrictions are determined 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.

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. We did not purchase any stock under the plan for the year ended December 31, 2013. Since inception of the program, we have purchased a total of 45.0 million shares at an aggregate purchase price of $208.4 million. At December 31, 2013, 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, price, applicable legal requirements and other factors. Our stock repurchase program may be suspended or discontinued at any time.

Investments

We make significant capital expenditures in order to service the demand of our customers. In 2013, our capital expenditures totaled $566.3 million or approximately 19.2% of net sales. Our spending was focused primarily on investments in packaging and test equipment supporting mobile communications applications, as well as the purchase of land relating to our factory and research and development center in Korea.

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We expect that our 2014 capital expenditures will be approximately $450 million. Our expected capital expenditures for 2014 primarily support customer demand for packaging and test services related to mobile communications. Ultimately, the amount of our 2014 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.

During 2013, we purchased land in Korea for $100.3 million in anticipation of building a new factory and research and development center. We also incurred design costs and $1.7 million of capitalized interest associated with our spending. The agreement to purchase the land for the facility is subject to our compliance with various construction, investment, hiring, regulatory and other requirements. We anticipate beginning construction of our new factory and research and development center in late 2014. Construction work is planned to continue through 2015 and into early 2016. There can be no assurance that the new facility will proceed at all, or that the actual scope, costs, timeline or benefits of the project will be consistent with our current expectations.

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."

In April 2013, we completed the exercise of our option to increase our ownership interest in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan, from 30% to 60% for an aggregate purchase price of $67.4 million. J-Devices is now owned 60% by Amkor, 34% by the former shareholders of NMD and 6% by Toshiba. We also have options to acquire additional equity interests in J-Devices. The options are exercisable at our discretion and permit us to increase our ownership interest in J-Devices up to 66% in 2014 and up to 80% in 2015 and thereafter. We currently plan to exercise our options and increase our ownership interest to 80%, subject to market and other conditions at the time of exercise. If we exercise our option as planned, certain governance restrictions will lapse, and we will then begin consolidating J-Devices' results. 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.

On July 31, 2013, we completed the purchase of Amkor Technology Malaysia Sdn. Bhd., Toshiba’s power discrete semiconductor packaging and test operation in Malaysia. The total price for the shares was approximately ¥6 billion ($60 million), based on the estimated net asset value at closing. The price for the shares is subject to adjustment to the extent the actual net asset value at closing was more or less than the estimate. We paid ¥4.1 billion ($42 million) in cash at closing and are obligated to pay the remaining ¥1.9 billion ($18 million) by March 31, 2014.

Cash Flows

Net cash provided by (used in) operating, investing and financing activities for each of the three years ended December 31, 2013 were as follows:

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Operating activities	$	557,536		$	389,063		$	516,832
Investing activities	(640,494		)	(520,121		)	(430,534		)
Financing activities	280,145			110,032			(58,877		)

Operating activities:  Our cash flows 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. Our cash provided by operating activities for the year ended December 31, 2012, decreased by $127.8 million compared to the year ended December 31, 2011. The decrease was driven by an increase in working capital.

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Investing activities:  Our cash flows used in investing activities for the year ended December 31, 2013, increased by $120.4 million compared to the year ended December 31, 2012. This increase was primarily due to the purchase of land relating to our planned new facility in Korea of $100.3 million, an investment in J-Devices of $67.4 million and for our newly acquired power discrete business in Malaysia of $42.4 million partially offset by a reduction in capital expenditures. Our cash used in investing activities for the year ended December 31, 2012, increased by $89.6 million compared to the year ended December 31, 2011. This increase was driven by a $66.8 million increase in purchases of property, plant and equipment.

Financing activities:  Our cash flows provided by financing activities for the year ended December 31, 2013, was $280.1 million. The net cash provided by financing activities resulted from the issuance of the Additional 2022 Notes for $225.0 million and borrowings of $150.0 million at our subsidiary in Korea offset by $80.0 million of foreign debt payments. Our cash provided by financing activities in 2012 was $110.0 million. The net cash provided by financing activities during 2012 included borrowings of $667.5 million offset by $470.1 million of foreign debt payments and the repurchase of $80.9 million of common stock under our authorized stock repurchase program.

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 purchases of 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 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. Our free cash flow improved $135.7 million to a negative $8.7 million for the year ended December 31, 2013, from a negative free cash flow of $144.4 million in the prior year, primarily due to higher net sales and improved profitability offset by the acquisition of land related to our planned new facility in Korea for $100.3 million.

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Net cash provided by operating activities	$	557,536		$	389,063		$	516,832
Less purchases of property, plant and equipment	566,256			533,512			466,694
Free cash flow	$	(8,720	)	$	(144,449	)	$	50,138

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Contractual Obligations

The following table summarizes our contractual obligations at December 31, 2013, 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		2014		2015		2016		2017		2018		Thereafter
	(In thousands)
Total debt	$	1,646,350	$	61,350	$	85,000	$	70,000	$	90,000	$	345,000	$	995,000
Scheduled interest payment obligations (1)	657,271		100,165		95,483		93,304		90,050		75,456		202,813
Purchase obligations (2)	109,516		89,291		4,062		2,489		2,489		4,986		6,199
Operating lease obligations	56,969		23,380		14,937		4,116		4,060		4,031		6,445
Severance obligations (3)	145,132		11,197		10,341		9,531		8,791		8,120		97,152
Total contractual obligations	$	2,615,238	$	285,383	$	209,823	$	179,440	$	195,390	$	437,593	$	1,307,609

(1) Scheduled interest payment obligations were calculated using stated coupon rates for fixed rate debt and interest rates applicable at December 31, 2013, for variable rate debt.

(2) Represents purchase obligations for capital expenditures and long-term supply contracts outstanding at December 31, 2013.

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

In addition to the obligations identified in the table above, other non-current liabilities recorded in our Consolidated Balance Sheet at December 31, 2013, include:

• $31.3 million of net foreign pension plan obligations and $3.2 million for employee-related liabilities, for which the timing and actual amount of our future cash flow is uncertain. We expect to contribute approximately $2.5 million to the defined benefit pension plans during 2014.

• $5.1 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, 2013, 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 than our operating lease obligations described above in "Contractual Obligations."

Other Contingencies

We refer you to Note 19 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 the 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 reported amounts of revenue and expenses during the reporting period. There can be no assurance that actual results will not differ from those estimates.

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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 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.

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 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.

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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 are 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 our 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, except for our subsidiaries in Japan.

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, 2013, 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, 2013, our income before income taxes for 2013 would have been approximately $13 million lower.

In addition, we have foreign currency exchange rate exposure on our results of operations. For the year ended December 31, 2013, approximately 93% of our net sales were denominated in U.S. dollars. Our remaining net sales were principally denominated in Korean won and Japanese yen for local country sales. For the year ended December 31, 2013, approximately 62% of our cost of sales and operating expenses were denominated in U.S. dollars and were largely for raw materials and factory supplies. 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, 2013, 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, 2013, exchange rates of the U.S. dollar compared to all of these Asian-based currencies as of December 31, 2013, our operating income for 2013 would have been approximately $90 million lower.

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.

We have foreign currency exchange rate exposure on our stockholders’ equity as a result of the translation of our subsidiaries and J-Devices in Japan where the local currency is the functional currency. To the extent the U.S. dollar strengthens against the local currency, the translation of these foreign currency denominated balances will result in reduced net sales, operating expenses, assets and liabilities. Similarly, our net sales, operating expenses, assets and liabilities will increase if the U.S. dollar weakens against the local currencies. The effect of foreign exchange rate translation on our Consolidated Balance Sheets for the years ended December 31, 2013 and 2012, was a net foreign translation loss of $17.0 million and $4.7 million, respectively, and was recognized as an adjustment to equity through other comprehensive income.

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Interest Rate Risk

We have interest rate risk with respect to our long-term debt. As of December 31, 2013, we had a total of $1,646.4 million of debt of which 80.6% was fixed rate debt and 19.4% was variable rate debt. The fixed rate debt consists of senior notes and senior subordinated notes. Our variable rate debt principally relates to our foreign borrowings and revolving lines of credit and any amounts outstanding under our $150.0 million senior secured revolving credit facility under which no amounts were drawn as of December 31, 2013. As of December 31, 2012, we had a total of $1,545.0 million of debt of which 83.8% was fixed rate debt and 16.2% was variable rate debt. 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 fair value of the senior subordinated notes is also impacted by changes in the market price of our common stock.

The table below presents the interest rates, maturities and fair value of our fixed and variable rate debt as of December 31, 2013.

	2014			2015			2016			2017			2018			Thereafter			Total			Fair Value
Long term debt:
Fixed rate debt (In thousands)	$	56,350		$	—		$	—		$	—		$	345,000		$	925,000		$	1,326,350		$	1,424,028
Average interest rate	6.0		%	—		%	—		%	—		%	7.4		%	6.5		%	6.7		%
Variable rate debt (In thousands)	$	5,000		$	85,000		$	70,000		$	90,000		$	—		$	70,000		$	320,000		$	320,000
Average interest rate	3.8		%	4.3		%	3.9		%	4.2		%	—		%	3.9		%	4.1		%

For information regarding the fair value of our long-term debt, see Note 18 to our Consolidated Financial Statements in Part II, Item 8 of this Annual Report on Form 10-K.

Equity Price Risk

We have convertible notes that are convertible into our common stock. If investors were to decide to convert their notes to common stock, our future earnings would benefit from a reduction in interest expense and our common stock outstanding would be increased. If we paid a premium to induce such conversion, our earnings could include an additional charge.

Further, 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.

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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, 2013, 2012 and 2011	53
Consolidated Statements of Comprehensive Income — Years ended December 31, 2013, 2012 and 2011	54
Consolidated Balance Sheets — December 31, 2013 and 2012	55
Consolidated Statements of Stockholders’ Equity — Years ended December 31, 2013, 2012 and 2011	56
Consolidated Statements of Cash Flows — Years ended December 31, 2013, 2012 and 2011	57
Notes to Consolidated Financial Statements	58
Schedule II — Valuation and Qualifying Accounts	93

51

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, 2013 and 2012, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2013 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, 2013 based on criteria established in Internal Control — Integrated Framework (1992) 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.

As described in Management's Report on Internal Control over Financial Reporting appearing under Item 9A, management has excluded Amkor Technology Malaysia Sdn. Bhd. from its assessment of internal control over financial reporting as of December 31, 2013 because it was acquired by the Company in a purchase business combination during 2013. We have also excluded Amkor Technology Malaysia Sdn. Bhd. from our audit of internal control over financial reporting. Amkor Technology Malaysia Sdn. Bhd. is a wholly-owned subsidiary whose total assets and total revenues represent 4% and 2%, respectively, of the related consolidated financial statement amounts as of and for the year ended December 31, 2013.

/s/  PricewaterhouseCoopers LLP

Phoenix, Arizona

February 28, 2014

52

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands, except per share data)
Net sales	$	2,956,450		$	2,759,546		$	2,776,359
Cost of sales	2,411,937			2,335,736			2,285,790
Gross profit	544,513			423,810			490,569
Selling, general and administrative	247,779			217,000			246,513
Research and development	64,625			54,118			50,386
Total operating expenses	312,404			271,118			296,899
Operating income	232,109			152,692			193,670
Interest expense	96,739			83,974			74,212
Interest expense, related party	9,169			13,969			12,394
Other expense, net	2,214			638			13,930
Total other expense, net	108,122			98,581			100,536
Income before taxes and equity in earnings of unconsolidated affiliate	123,987			54,111			93,134
Income tax expense	22,646			17,001			7,124
Income before equity in earnings of unconsolidated affiliate	101,341			37,110			86,010
Equity in earnings of J-Devices	10,316			5,592			7,085
Net income	111,657			42,702			93,095
Net income attributable to noncontrolling interests	(2,361		)	(884		)	(1,287		)
Net income attributable to Amkor	$	109,296		$	41,818		$	91,808
Net income attributable to Amkor per common share:
Basic	$	0.58		$	0.26		$	0.48
Diluted	$	0.50		$	0.24		$	0.39
Shares used in computing per common share amounts:
Basic	187,032			160,105			190,829
Diluted	235,330			243,004			273,686

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,
	2013			2012			2011
	(In thousands)
Net income	$	111,657		$	42,702		$	93,095
Other comprehensive (loss) income, net of tax:
Adjustments to unrealized components of defined benefit pension plans, net of tax (expense) benefit of ($252), ($35) and $362	4,360			5,137			(5,800		)
Cumulative translation adjustment	(4,895		)	(2,688		)	1,539
Equity interest in J-Devices' other comprehensive loss, net of tax benefit (expense) of $202, $1,552 and ($1,754)	(10,961		)	(2,057		)	(347		)
Total other comprehensive (loss) income	(11,496		)	392			(4,608		)
Comprehensive income	100,161			43,094			88,487
Comprehensive income attributable to noncontrolling interests	(2,361		)	(884		)	(1,287		)
Comprehensive income attributable to Amkor	$	97,800		$	42,210		$	87,200

The accompanying notes are an integral part of these statements.

54

AMKOR TECHNOLOGY, INC.

CONSOLIDATED BALANCE SHEETS

	December 31,
	2013			2012
	(In thousands, except per share data)
ASSETS
Current assets:
Cash and cash equivalents	$	610,442		$	413,048
Restricted cash	2,681			2,680
Accounts receivable:
Trade, net of allowances	382,037			389,699
Other	3,505			13,098
Inventories	200,423			227,439
Other current assets	33,328			45,444
Total current assets	1,232,416			1,091,408
Property, plant and equipment, net	2,006,553			1,819,969
Intangibles, net	3,189			4,766
Investments	105,214			38,690
Restricted cash	2,234			2,308
Other assets	77,692			68,074
Total assets	$	3,427,298		$	3,025,215
LIABILITIES AND EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	61,350		$	—
Trade accounts payable	365,334			439,663
Accrued expenses	264,252			212,964
Total current liabilities	690,936			652,627
Long-term debt	1,516,390			1,320,000
Long-term debt, related party	75,000			225,000
Pension and severance obligations	165,073			139,379
Other non-current liabilities	14,959			21,415
Total liabilities	2,462,358			2,358,421
Commitments and contingencies (Note 19)
Equity:
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, 262,109 and 197,709 shares issued, and 216,702 and 152,397 shares outstanding, in 2013 and 2012, respectively	262			198
Additional paid-in capital	1,812,530			1,614,143
Accumulated deficit	(647,348		)	(756,644		)
Accumulated other comprehensive (loss) income	(255		)	11,241
Treasury stock, at cost, 45,407 and 45,312 shares in 2013 and 2012, respectively	(211,449		)	(210,983		)
Total Amkor stockholders’ equity	953,740			657,955
Noncontrolling interests in subsidiaries	11,200			8,839
Total equity	964,940			666,794
Total liabilities and equity	$	3,427,298		$	3,025,215

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								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, 2010	183,467	$	183	$	1,504,927	$	(890,270	)	$	15,457		(47	)	$	(284	)	$	630,013		$	6,668	$	636,681
Net income	—	—		—		91,808			—			—		—			91,808			1,287		93,095
Other comprehensive loss	—	—		—		—			(4,608		)	—		—			(4,608		)	—		(4,608		)
Conversion of debt to common stock	13,351	13		100,484		—			—			—		—			100,497			—		100,497
Repurchase of common stock	—	—		—		—			—			(28,573	)	(129,500		)	(129,500		)	—		(129,500		)
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(111	)	(776		)	(776		)	—		(776		)
Issuance of stock through share-based compensation plans	541	1		821		—			—			—		—			822			—		822
Share-based compensation expense	—	—		5,010		—			—			—		—			5,010			—		5,010
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

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,
	2013			2012			2011
	(In thousands)
Cash flows from operating activities:
Net income	$	111,657		$	42,702		$	93,095
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	410,346			370,479			335,644
Amortization of deferred debt issuance costs and premiums	2,880			3,663			3,737
Deferred income taxes	(8,256		)	6,078			(2,239		)
Equity in earnings of unconsolidated affiliate	(10,316		)	(5,592		)	(7,085		)
Loss on debt retirement, net	11,619			737			10,557
(Gain) loss on disposal of fixed assets, net	(2,545		)	(1,676		)	1,942
Share-based compensation	2,971			2,720			5,010
Other, net	(712		)	(1,279		)	(189		)
Changes in assets and liabilities:
Accounts receivable	(992		)	(96,107		)	95,882
Other receivables	461			(1,570		)	2,813
Inventories	38,248			(29,882		)	(6,912		)
Other current assets	10,873			(5,015		)	(5,597		)
Other assets	(3,709		)	(598		)	347
Trade accounts payable	(67,198		)	17,142			(7,539		)
Accrued expenses	32,001			66,566			(21,676		)
Other non-current liabilities	30,208			20,695			19,042
Net cash provided by operating activities	557,536			389,063			516,832
Cash flows from investing activities:
Purchases of property, plant and equipment	(566,256		)	(533,512		)	(466,694		)
Acquisition of business, net of cash acquired	(41,865		)	—			—
Proceeds from the sale of property, plant and equipment	27,209			2,727			15,823
Payments from J-Devices	8,843			15,484			10,794
Investment in J-Devices	(67,372		)	—			—
Change in restricted cash	74			1,693			13,046
Other investing activities	(1,127		)	(6,513		)	(3,503		)
Net cash used in investing activities	(640,494		)	(520,121		)	(430,534		)
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			26,567
Payments of short-term debt	—			(50,000		)	(21,567		)
Proceeds from issuance of long-term debt	375,000			637,528			387,512
Proceeds from issuance of long-term debt, related party	—			—			75,000
Payments of long-term debt, net of certain redemption premiums	(80,000		)	(420,116		)	(392,191		)
Payments for debt issuance costs	(3,216		)	(6,007		)	(5,875		)
Payments for the retirement of debt	(11,619		)	—			—
Payments for repurchase of common stock	—			(80,946		)	(128,368		)
Proceeds from issuance of stock through share-based compensation plans	446			182			821
Payments of tax withholding for restricted shares	(466		)	(609		)	(776		)
Net cash provided by (used in) financing activities	280,145			110,032			(58,877		)
Effect of exchange rate fluctuations on cash and cash equivalents	207			(557		)	2,212
Net increase (decrease) in cash and cash equivalents	197,394			(21,583		)	29,633
Cash and cash equivalents, beginning of period	413,048			434,631			404,998
Cash and cash equivalents, end of period	$	610,442		$	413,048		$	434,631
Supplemental disclosures of cash flow information:
Cash paid during the period for:
Interest	$	100,577		$	86,138		$	81,280
Income taxes	18,318			8,199			16,380
Non-cash investing activities:
Common stock issuance for exchange of 6.0% convertible senior subordinated notes due April 2014, $150 million related party	193,650			—			—
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	—			—			100,000

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 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, Taiwan and the United States (“U.S.”).

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). 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. Actual results could differ materially from those estimates and assumptions.

Beginning with the year ended December 31, 2013, we reclassified equity in earnings of unconsolidated affiliate from other expense (income) to below income tax expense in our Consolidated Statements of Income for all periods presented. The income tax note (Note 6) was revised accordingly. The revision had no impact on net income.

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, 2013, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.9 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, 2013, 2012 or 2011. The creditors of the Philippine realty corporations have no recourse to our general credit.

58

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Foreign Currency Translation

The U.S. dollar is the functional currency of our subsidiaries in China, Korea, Malaysia, the Philippines, Singapore and Taiwan, 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 subsidiaries in Japan. The asset and liability amounts of these subsidiaries 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 asset and liability 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 exchange gains or losses are included in other expense (income) in the period in which they occur.

Concentrations and Credit Risk

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. 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, 2013, 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

Our future results of operations involve a number of risks and uncertainties. Factors that could affect our business or future results and cause actual results to vary materially from historical results include, but are not limited to, dependence on the highly cyclical semiconductor industry, fluctuations in operating results and cash flows, absence of significant backlog in our business, high fixed costs, failure to meet guidance, declining average selling prices, decisions by our integrated device manufacturer customers to curtail outsourcing, our substantial indebtedness, our ability to fund liquidity needs, restrictive covenants contained in the agreements governing our indebtedness, significant severance plan obligations, failure to maintain an effective system of internal controls, product return and liability risks including warranty claims, dependence on international operations and sales, continuing development and implementation of changes to our management information systems, attracting and retaining qualified employees, difficulties consolidating and integrating our operations, dependence on materials and equipment suppliers, customer concentration and loss of customers, the need for significant capital expenditures, impairment charges, litigation incident to our business, adverse tax consequences, the development of new proprietary technology and the enforcement of intellectual property rights by or against us, complexity of packaging and test processes, competition, our need to comply with existing and future environmental, health and safety laws and initiatives, natural disasters and other calamities and continued control by existing stockholders.

We believe that our cash flows from operating activities together with existing cash and cash equivalents will be sufficient to fund our working capital, capital expenditure and debt service requirements for at least the next twelve months. Thereafter, our liquidity will continue to be affected by, among other things, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels and our ability to either repay debt out of operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings.

We are subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 19. 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

59

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

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.

60

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Intangibles

Finite-lived intangible assets include customer relationship and supply agreements as well as patents and technology rights and are amortized on a straight-line basis over their estimated useful lives, generally for periods ranging from 3 to 10 years. We continually evaluate the reasonableness of the useful lives of these assets. Finite-lived intangibles are tested for recoverability whenever events or changes in circumstances indicate the carrying amounts may not be recoverable. An impairment loss, if any, would be measured as the excess of the carrying value over the fair value determined by discounted future cash flows.

Investments

We have a 60% ownership interest in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan. See Note 12 for additional information. Our investment 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.

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 uncertain income tax positions, deferred revenue, employee-related liabilities, deposits and deferred tax liabilities.

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. See Note 4 and Note 17 for more information.

Fair Value Measurements

We apply fair value accounting for all financial 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 18 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services 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.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

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.

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, 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 6 for more information regarding unrecognized income tax benefits.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

2. New Accounting Standards

Recently Adopted Standards

In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Topic 220). ASU 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income ("AOCI") by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. ASU 2013-02 does not change the current requirements for reporting net income or other comprehensive income in the financial statements. This ASU is effective for reporting periods beginning after December 15, 2012. ASU 2013-02 was adopted on January 1, 2013 and did not have a significant impact on our financial statements.

Recently Issued Standards

In March 2013, the FASB issued 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 may affect our financial statements to the extent we sell or cease to hold a controlling interest in subsidiaries or groups of assets within a foreign entity.

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 approximately ¥6 billion ($60 million), based on the estimated net asset value at closing. The price for the shares is subject to adjustment to the extent the actual net asset value at closing was more or less than the estimate. We paid ¥4.1 billion ($42 million) in cash at closing and are obligated to pay the remaining ¥1.9 billion ($18 million) by March 31, 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. 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. 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. The following table presents share-based compensation expense attributable to stock options and restricted shares:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Stock options	$	883	$	1,160	$	2,025
Restricted shares	2,088		1,560		2,985
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

63

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table presents share-based compensation expense included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Selling, general and administrative	$	2,591	$	2,368	$	4,363
Research and development	380		352		647
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

There is no corresponding deferred income tax benefit for stock options or restricted shares.

Equity Incentive Plans

Amended and Restated 2007 Equity Incentive Plan.  On August 6, 2007, our shareholders approved the 2007 Equity Incentive Plan. On May 8, 2012, our shareholders considered certain changes to the plan which was approved as the Amended and Restated 2007 Equity Incentive Plan, (the “2007 Plan”) that 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 initial effective date of this plan was January 1, 2008, and there were originally 17,000,000 shares of our common stock reserved for issuance under the 2007 Plan.

2003 Nonstatutory Inducement Grant Stock Plan.  On September 9, 2003, we initiated the 2003 Nonstatutory Inducement Grant Stock Plan (the “2003 Plan”). The 2003 Plan generally provides for the grant to employees, directors and consultants of stock options and stock purchase rights and is generally used as an inducement benefit for the purpose of retaining new employees. There is a provision for an annual replenishment to bring the number of shares of common stock reserved for issuance under the plan up to 300,000 as of each January 1.

1998 Stock Plan.  The 1998 Stock Plan terminated in January 2008. The 1998 Stock Plan generally provided for grants to employees, directors and consultants of stock options and stock purchase rights. The options granted vest over a two to five year period.

A summary of the stock plans, the respective plan termination dates and shares available for grant as of December 31, 2013, is shown below:

Stock Plans	Amended and Restated 2007 Equity Incentive Plan	2003 Inducement Plan
Contractual life (years)	10	10
Plan termination date	Board of Directors Discretion	Board of Directors Discretion
Shares available for grant at December 31, 2013 (in thousands)	11,580	471

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

64

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

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, 2013:

	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, 2012	4,893	$	9.52
Granted	2,085	4.39
Exercised	(96)	4.65
Forfeited or expired	(2,009)	11.69
Outstanding at December 31, 2013	4,873	$	6.52	5.74	$	4,661
Fully vested at December 31, 2013 and expected to vest thereafter	4,834	$	6.54	5.71	$	4,594
Exercisable at December 31, 2013	2,688	$	8.22	2.70	$	926

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

	For the Year Ended December 31,
	2013			2012			2011
Expected life (in years)	6.2			6.0			6.2
Risk-free interest rate	1.7		%	1.0		%	2.4		%
Volatility	60		%	65		%	67		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	2.49		$	2.68		$	4.06

The intrinsic value of options exercised for the years ended December 31, 2013, 2012 and 2011 was $0.1 million, $0.1 million and $0.4 million, respectively. For the years ended December 31, 2013, 2012 and 2011, cash received under all share-based payment arrangements was $0.4 million, $0.2 million and $0.8 million, respectively. The related cash receipts are included in financing activities in the accompanying Consolidated Statements of Cash Flows. Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $4.4 million as of December 31, 2013, which is expected to be recognized over a weighted-average period of approximately 3.4 years beginning January 1, 2013. To the extent that the actual forfeiture rate is different than what we have anticipated, the share-based compensation expense related to these options will be different from our expectations.

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.

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The 2007 Plan and the terms of certain share grants provide that for certain grants, when a recipient’s age plus years of service equals or exceeds 75, the recipient will be eligible to voluntarily retire and become fully vested in their applicable restricted shares upon retirement. Consequently, under federal tax law, when a recipient becomes retirement eligible, the employee is immediately taxable on 100% of their applicable restricted shares whether or not the recipient actually retires. Upon the earlier of retirement eligibility or vesting of the applicable restricted shares, the recipient has a tax liability for applicable grants and pursuant to the recipient’s award agreement, a portion of the restricted shares are withheld to satisfy the recipient’s statutory minimum tax withholding obligations. The shares withheld are accounted for as treasury stock at cost, which is determined by the closing stock price per share on the applicable date of vesting or retirement eligibility.

The following table summarizes our restricted share activity for the year ended December 31, 2013:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2012	816		$	5.61
Awards granted	750		4.50
Awards vested	(277	)	6.19
Awards forfeited	(117	)	4.92
Nonvested at December 31, 2013	1,172		$	4.83

Awards vested of 0.3 million, included less than 0.1 million shares for retirement eligible recipients whose applicable restricted shares are treated for accounting and tax purposes as if vested when they meet the retirement eligible date. The fair value of shares vested was $1.4 million, $1.7 million and $2.6 million during 2013, 2012 and 2011, respectively.

Total unrecognized compensation cost, net of a forfeiture estimate, was $4.3 million as of December 31, 2013, which is expected to be recognized over a weighted average period of approximately 3.0 years beginning January 1, 2013. To the extent that the actual forfeiture rate is different than what we have anticipated, the share-based compensation expense related to these awards will be different from our expectations.

5. Other Income and Expense

Other income and expense consists of the following:

	December 31,
	2013			2012			2011
	(In thousands)
Interest income	$	(3,785	)	$	(3,160	)	$	(2,749	)
Foreign currency (gain) loss	(5,626		)	4,185			2,178
Loss on debt retirement, net	12,330			1,199			15,531
Other income, net	(705		)	(1,586		)	(1,030		)
Total other expense, net	$	2,214		$	638		$	13,930

66

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

6. Income Taxes

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

	For the Year Ended December 31,
	2013			2012		2011
	(In thousands)
United States	$	(36,829	)	$	17,062	$	(8,097	)
Foreign	160,816			37,049		101,231
Total income before income taxes	$	123,987		$	54,111	$	93,134

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,
	2013			2012			2011
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	—			(75		)	377
Foreign	30,902			10,998			8,986
	30,902			10,923			9,363
Deferred
Federal	(8,556		)	1,859			2,356
State	9			266			337
Foreign	291			3,953			(4,932		)
	(8,256		)	6,078			(2,239		)
Total provision	$	22,646		$	17,001		$	7,124

67

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

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,
	2013			2012			2011
	(In thousands)
U.S. federal tax at 35%	$	43,396		$	18,939		$	32,559
State taxes, net of federal benefit	1,124			1,126			1,451
Foreign income taxed at different rates	(17,814		)	(14,717		)	(22,507		)
Foreign exchange gain (loss)	844			12,329			(5,966		)
Change in valuation allowance	(32,415		)	(3,112		)	(8,672		)
Adjustments related to prior years	2,727			(2,464		)	3,582
Income tax credits generated	(2,622		)	(1,370		)	(466		)
Repatriation of foreign earnings and profits	6,499			3,240			3,388
Expiration of capital loss carryforward	15,555			—			—
Equity in earnings of J-Devices	—			2,404			3,047
Acquisition expenses	1,381			—			—
Debt conversion costs	4,067			—			—
Other	(96		)	626			708
Total	$	22,646		$	17,001		$	7,124

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 and certain costs in connection with our purchase of the shares of Amkor Technology Malaysia Sdn. Bhd.

Income tax expense in 2012 and 2011 includes deferred taxes on undistributed earnings from our investment in J-Devices. In 2013, deferred taxes were not required as a result of a change in our ownership structure of our investment in J-Devices.

68

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,
	2013			2012
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	147,905		$	155,270
Capital loss carryforwards	—			18,221
Income tax credits	27,751			31,665
Property, plant and equipment	14,390			283
Accrued liabilities	57,374			46,045
Unrealized foreign exchange loss	3,893			3,949
Other	15,137			19,252
Total deferred tax assets	266,450			274,685
Valuation allowance	(179,183		)	(209,757		)
Total deferred tax assets net of valuation allowance	87,267			64,928
Deferred tax liabilities:
Property, plant and equipment	21,716			3,263
Deferred gain	6,295			6,899
Other	1,967			13,031
Total deferred tax liabilities	29,978			23,193
Net deferred tax assets	$	57,289		$	41,735
Recognized as:
Other current assets	$	10,729		$	12,615
Other assets	47,609			40,047
Accrued expenses	(97		)	(800		)
Other non-current liabilities	(952		)	(10,127		)
Total	$	57,289		$	41,735

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.

In 2011, the valuation allowance on our deferred tax assets decreased by $9.3 million primarily as a result of the write-off of net operating loss carryforwards in connection with the liquidation of our Singapore manufacturing operations and the reorganization of the corporate structure of our Philippine manufacturing operations.

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, 2013 and 2012 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

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AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

to contributed capital in the amount of $6.6 million. As a result of net operating loss carryforwards, we were not able to recognize the excess tax benefits of stock option deductions in 2013 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 $4.8 million, $13.7 million and $5.7 million in tax benefits as a result of the tax holidays in 2013, 2012 and 2011, respectively. The benefit of the tax holidays on diluted earnings per share was approximately $0.02, $0.06 and $0.02 for 2013, 2012 and 2011, respectively.

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

	For the Year Ended December 31,
	2013		2012		Expiration
	(In thousands)
U.S. Federal NOL’s	$	342,770	$	363,913	2021-2033
U.S. State NOL’s	197,618		210,539		2014-2031
Foreign NOL’s	38,337		56,393		2014-2022

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 and capital losses available for carryforward have been fully reserved with valuation allowances at December 31, 2013 and 2012. Also, our ability to utilize our U.S. net operating and capital loss carryforwards may be limited in the future if we experience an ownership change as defined by the Internal Revenue Code.

At December 31, 2013, 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 $15.4 million expiring in varying amounts through 2018 at our subsidiary in Korea. The deferred tax assets associated with the U.S. foreign income tax credits have been fully reserved with a valuation allowance. Income tax credits generated by certain of our foreign subsidiaries in 2013, 2012 and 2011 have been recognized in our income tax provision.

Income taxes have not been provided on approximately $512.4 million of the undistributed earnings of our foreign subsidiaries at December 31, 2013, 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 $6.3 million and insignificant U.S. federal income tax after foreign tax credits.

In 2011, we provided U.S. income tax on approximately $8.9 million of foreign earnings from a Singapore subsidiary where we made the decision to commence liquidation. The U.S. income tax of $3.1 million on these foreign earnings was fully offset by the tax benefit of our U.S. net operating losses.

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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. Current examinations include our 2010 Philippines income tax return and our 2008-2012 Korean income tax returns. Our tax returns for open years in all jurisdictions are subject to changes upon examination. Summarized below are the years subject to examination for our largest subsidiaries.

Jurisdiction	Years
United States	2010-2013
Korea	2008-2013
Philippines	2010-2013
Japan	2008-2013
China	2008-2013
Singapore	2009-2013
Malaysia	2007-2013
Taiwan	2010-2013

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

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Balance at January 1	$	8,218		$	7,930		$	10,503
Additions based on tax positions related to the current year	17,752			5,551			24
Additions for tax positions of prior years	2,723			54			699
Reductions for tax positions of prior years	(108		)	(4,091		)	(2,248		)
Reductions related to settlements with tax authorities	(1,353		)	(1,226		)	(991		)
Reductions from lapse of statutes of limitations	(104		)	—			(57		)
Balance at December 31	$	27,128		$	8,218		$	7,930

The net increase in our unrecognized tax benefits was $18.9 million from December 31, 2012, to December 31, 2013. Our unrecognized tax benefits increased primarily because of $19.7 million of additions related to the characterization of deductions in a foreign jurisdiction and a $0.6 million addition related to revenue attribution. These increases were offset by $1.4 million of net reductions primarily related to the settlement of contested prior year deductions in a foreign jurisdiction. At December 31, 2013, all of our gross unrecognized tax benefits would reduce our effective tax rate, if recognized.

The liability related to our unrecognized tax benefits is $5.1 million as of December 31, 2013, and is reported as a component of other non-current liabilities. The unrecognized tax benefits in the table above include the reduction of 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 could change significantly within 12 months. Given the number of years subject to examination, the number of matters being examined and the uncertainty of the timing of resolution of the audits, we are unable to estimate the full range of possible adjustments to the balance of our gross unrecognized tax benefits.

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.

71

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

7. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common shareholders 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. Unvested share-based compensation awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities and are included in the computation of EPS pursuant to the two-class method. We grant restricted shares which entitle recipients to voting and nonforfeitable dividend rights from the date of grant. As a result, we have applied the two-class method to determine EPS.

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,
	2013			2012			2011
	(In thousands, except per share data)
Net income attributable to Amkor	$	109,296		$	41,818		$	91,808
Income allocated to participating securities	(681		)	(212		)	(332		)
Net income available to Amkor common stockholders	108,615			41,606			91,476
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	93			212			332
Interest on 6.0% convertible notes due 2014, net of tax	9,440			16,103			16,103
Net income attributable to Amkor — diluted	$	118,148		$	57,921		$	107,911
Weighted average shares outstanding — basic	187,032			160,105			190,829
Effect of dilutive securities:
Stock options and restricted share awards	21			241			199
6.0% convertible notes due 2014	48,277			82,658			82,658
Weighted average shares outstanding — diluted	235,330			243,004			273,686
Net income attributable to Amkor per common share:
Basic	$	0.58		$	0.26		$	0.48
Diluted	0.50			0.24			0.39

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,
	2013	2012	2011
	(In thousands)
Stock options and restricted share awards	4,890	4,416	5,070
2.5% convertible notes due 2011	—	—	1,094
6.25% convertible notes due 2013	—	—	695
Total potentially dilutive shares	4,890	4,416	6,859

72

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

8. Accounts Receivable, Trade

Accounts receivable, trade consist of the following:

	December 31,
	2013			2012
	(In thousands)
Accounts receivable	$	389,157		$	391,969
Allowance for sales credits	(7,044		)	(2,255		)
Allowance for doubtful accounts	(76		)	(15		)
Total accounts receivable trade, net of allowances	$	382,037		$	389,699

9. Inventories

Inventories consist of the following:

	December 31,
	2013		2012
	(In thousands)
Raw materials and purchased components	$	147,292	$	166,691
Work-in-process	53,131		60,748
Total inventories	$	200,423	$	227,439

10. Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2013			2012
	(In thousands)
Land	$	208,048		$	106,338
Land use rights	26,845			19,945
Buildings and improvements	911,258			904,919
Machinery and equipment	3,577,045			3,332,855
Software and computer equipment	193,641			191,132
Furniture, fixtures and other equipment	17,430			19,194
Construction in progress	27,039			24,670
	4,961,306			4,599,053
Less accumulated depreciation and amortization	(2,954,753		)	(2,779,084		)
Total property, plant and equipment, net	$	2,006,553		$	1,819,969

73

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table presents depreciation expense as included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Cost of sales	$	377,022	$	336,542	$	302,011
Selling, general and administrative	15,331		19,487		22,387
Research and development	14,360		10,600		5,981
Total depreciation expense	$	406,713	$	366,629	$	330,379

In January 2013, we sold office space and land located in Chandler, Arizona for $22.8 million, net of selling costs of $1.2 million. During 2013, we also purchased land for a factory and research and development center in Korea for $100.3 million and incurred design costs and $1.7 million of capitalized interest associated with our spending.

11. Intangibles

Intangibles as of December 31, 2013, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	21,929	$	(18,740	)	$	3,189
Customer relationships	8,000		(8,000		)	—
Total intangibles	$	29,929	$	(26,740	)	$	3,189

Intangibles as of December 31, 2012, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	22,169	$	(19,636	)	$	2,533
Customer relationships	8,000		(5,767		)	2,233
Total intangibles	$	30,169	$	(25,403	)	$	4,766

Amortization of identifiable intangible assets was $3.6 million, $3.9 million and $5.2 million in 2013, 2012 and 2011, respectively. Based on the amortizing assets recognized in our balance sheet at December 31, 2013, amortization for each of the next five years is estimated as follows:

	Amortization
	(In thousands)
2014	$	1,028
2015	736
2016	521
2017	488
2018	275
Thereafter	141
Total amortization	$	3,189

74

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

12. Investments

Investments consist of the following:

	December 31,
	2013				2012
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	105,214	60.0	%	$	38,690	30.0	%

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. In April 2013, we completed the exercise of our option to increase our ownership interest in J-Devices from 30% to 60% for an aggregate purchase price of $67.4 million. J-Devices is owned 60% by Amkor, 34% by the former shareholders of NMD and 6% by Toshiba.

At December 31, 2013, our investment includes our 60% equity interest and options to acquire additional equity interests. The remaining options are exercisable at our discretion and permit us to increase our ownership interest in J-Devices up to 66% in 2014 by purchasing shares owned by Toshiba and up to 80% in 2015 and thereafter by purchasing shares owned by the other shareholders. In 2014 and beyond, Toshiba has the option, at its discretion, to sell shares it owns to us. If we decline Toshiba's offer to sell its shares to us, then J-Devices shall have the obligation to purchase the shares. If J-Devices is unable to fulfill its obligation to purchase the shares offered by Toshiba, then we will be obligated to purchase the shares offered by Toshiba. The options in 2014 and 2015 become exercisable in the fourth quarter of such year, 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 upon 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 a basis difference as a result of the cost of our original investment exceeding our proportionate share of J-Devices' equity. The net unamortized basis difference from our original investment was fully amortized as of December 31, 2013. Because our incremental proportionate share of J-Devices' equity exceeded the cost of our additional investment, these adjustments also include the amortization of an additional basis difference. The net unamortized basis difference from our incremental investment was $2.9 million at December 31, 2013.

75

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following tables present summary financial information of J-Devices:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Summary income statement information for J-Devices
Net sales	$	825,135	$	531,530	$	576,421
Gross profit	83,778		61,003		82,729
Net income	16,538		20,299		25,412

	December 31,
	2013		2012
	(In thousands)
Summary balance sheet information for J-Devices
Current assets	$	352,628	$	240,759
Non-current assets (including property, plant and equipment)	234,241		201,459
Current liabilities (including debt)	298,401		225,531
Total debt	131,275		144,733
Non-current liabilities (including debt)	108,928		96,612
Total stockholders' equity	179,540		120,075

In conjunction with entering into the joint venture, one of our existing subsidiaries in Japan purchased packaging and test equipment from Toshiba for $44.7 million and leased the equipment to J-Devices under an agreement which was accounted for as a direct financing lease. At the end of the lease in October 2012, J-Devices purchased the remaining equipment for $8.8 million, which was paid in January 2013.

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

13. Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2013		2012
	(In thousands)
Payroll and benefits	$	75,909	$	56,651
Deferred revenue and customer advances	44,764		52,773
Accrued royalties (Note 19)	43,324		33,324
Accrued interest	21,807		19,048
Acquisition payable (Note 3)	17,897		—
Income taxes payable	17,528		8,341
Accrued severance plan obligations (Note 15)	11,197		9,516
Other accrued expenses	31,826		33,311
Total accrued expenses	$	264,252	$	212,964

Accrued royalties relate to our estimate of royalties due as a result of our pending patent license litigation (Note 19).

76

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,
	2013			2012
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017	$	—		$	—
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 (1)	525,000			300,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes (2)	56,350			250,000
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, foreign currency funding-linked base rate plus 2.30%, due March 2015 (4)	80,000			100,000
Term loan, LIBOR plus 3.70%, due June 2016 (5)	70,000			—
Term loan, LIBOR plus 3.90% or 3.94%, due July 2017 (6)	90,000			137,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	10,000			—
Term loan, LIBOR plus 3.70%, due December 2019 (8)	70,000			13,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (9)	—			—
	1,646,350			1,545,000
Add: Unamortized premium (1)	6,390			—
Less: Short-term borrowings and current portion of long-term debt	(61,350		)	—
Long-term debt (including related party)	$	1,591,390		$	1,545,000

(1) In September 2012, we issued $300.0 million of 6.375% Senior Notes due October 2022 (the “2022 Notes”). The 2022 Notes were issued at par and are senior unsecured obligations. Interest is payable semi-annually on April 1 and October 1 of each year, and commenced April 1, 2013. In May 2013, we issued an additional $225.0 million of 6.375% Senior Notes due October 2022 (the “Additional 2022 Notes”) under the same terms as the 2022 Notes. The Additional 2022 Notes were issued at a premium of 103% or $6.8 million. The net proceeds from the issuance of the Additional 2022 Notes were designated for general corporate purposes. We incurred $3.4 million of debt issuance costs associated with the Additional 2022 Notes.

(2) In April 2009, we issued $250 million of our 6.0% Convertible Senior Subordinated Notes due April 2014 (the “2014 Notes”). The 2014 Notes are 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. The 2014 Notes are subordinated to the prior payment in full of all of our senior debt. The 2014 Notes were purchased by certain qualified institutional buyers and an entity controlled by Mr. James J. Kim, our Executive Chairman of the Board of Directors. Mr. Kim's affiliate purchased $150.0 million of the 2014 Notes. In June 2013, we completed a tender offer for the 2014 Notes and

77

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

exchanged $193.7 million of the 2014 Notes, including the $150.0 million held by Mr. Kim's affiliate, for an aggregate 64.0 million shares of our common stock and a cash payment of $11.6 million. The cash payment was equivalent to the remaining coupons for the tendered notes and was recorded as a charge in our Consolidated Statements of Income for the year ended December 31, 2013.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. Principal is payable upon maturity and interest is paid monthly. 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. As of December 31, 2013, $41.0 million was available to be borrowed for general working capital purposes.

(4) In March 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2015. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity, however an early repayment of $20.0 million was made in November 2013.

(5) In April 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In December 2013, the loan agreement was amended which adjusted the base interest rate from 3.80% to 3.70%. As of December 31, 2013, $80.0 million was available to be borrowed for general working capital purposes and the repayment of inter-company debt.

(6) In June 2012, we entered into a $150.0 million secured term loan for five years with a Korean bank which is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. The $150.0 million consists of two components, $50.0 million of the proceeds ("Tranche A") which was used to fully repay our term loan due July 2014 and $100.0 million ("Tranche B") to fund capital expenditures. The term loan was fully drawn in January 2013. Principal is payable upon maturity; however, an early repayment of $60.0 million was made in December 2013.

(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. As of December 31, 2013, $140.0 million was available to be borrowed for capital expenditures.

(8) In November 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2014. In November 2013, the loan agreement was amended which extended the borrowing period from November 2013 to March 2014. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable upon maturity. As of December 31, 2013, $30.0 million was available to be borrowed for capital expenditures.

(9) 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, 2013, $29.0 million was available to be drawn for general corporate purposes and capital expenditures.

Interest Rates

As of December 31, 2013, we had a total of $1,646.4 million of debt of which 80.6% was fixed rate debt and 19.4% was variable rate debt. As of December 31, 2012, we had a total of $1,545.0 million of debt of which 83.8% was fixed rate debt and 16.2% was variable rate debt. The fixed rate debt consists of senior notes and senior subordinated notes. Our variable rate debt principally relates to our foreign borrowings and revolving lines of credit and any amounts outstanding under our $150.0 million senior and secured revolving line of credit.

78

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Interest is payable semiannually on each of the senior notes and senior subordinated notes and interest is payable semi-annually, quarterly or monthly on the 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,
	2013		2012
Amkor Technology, Inc.
Amkor Technology Korea, Inc.:
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	4.29	%	4.21	%
Term loan, LIBOR plus 3.70%, due June 2016	3.95	%	—
Term loan, LIBOR plus 3.90%, due July 2017 (Tranche A)	4.14	%	4.26	%
Term loan, LIBOR plus 3.94%, due July 2017 (Tranche B)	4.18	%	4.26	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.76	%	—
Term loan, LIBOR plus 3.70%, due December 2019	3.95	%	4.01	%

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 indentures governing our senior and senior subordinated notes 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, 2013 and 2012.

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2014	$	61,350
2015	85,000
2016	70,000
2017	90,000
2018	345,000
Thereafter	995,000
Total debt	$	1,646,350

79

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

15.Pension and Severance Plans

U.S. Defined Contribution Plan

We have a defined contribution plan covering substantially all U.S. employees. Eligible employees can contribute up to 60% of their salary, subject to annual Internal Revenue Service limitations. We match in cash 75% of the employee’s contributions up to a defined maximum as determined on an annual basis. The expense for this plan was $1.8 million in 2013 and 2012 and $1.9 million in 2011.

Malaysia Defined Contribution Plan

We have a defined contribution plan under the Employees Provident Fund Act in Malaysia whereby employees contribute up to 11% of their salary. We contribute an amount equivalent to no less than 12% of the employees’ salaries up to a defined maximum into their individual accounts. The expense for this plan was $1.0 million in 2013.

Taiwan Defined Contribution Plan

We have a defined contribution plan under the Taiwanese Labor Pension Act in Taiwan whereby employees can contribute up to 6% of their salary. We contribute an amount equivalent to no less than 6% of the employees’ salaries up to a defined maximum into their individual accounts. The expense for this plan was $2.4 million in 2013 and $2.3 million in 2012 and 2011.

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,
	2013			2012			2011
	(In thousands)
Balance at the beginning of year	$	126,762		$	106,715		$	88,899
Provision of severance benefits	26,550			19,667			26,705
Severance payments	(10,402		)	(8,520		)	(6,717		)
Loss (gain) on foreign currency	2,463			8,900			(2,172		)
	145,373			126,762			106,715
Payments remaining with the National Pension Fund	(241		)	(249		)	(239		)
Total severance obligation balance at the end of year	145,132			126,513			106,476
Less current portion of accrued severance obligation (Note 13)	11,197			9,516			7,476
Non-current portion of severance obligation	$	133,935		$	116,997		$	99,000

80

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

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, 2013 and 2012.

	For the Year Ended December 31,
	2013			2012
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	80,528		$	78,897
Service cost	5,909			6,362
Interest cost	3,170			3,270
Benefits paid	(1,602		)	(1,168		)
Actuarial gains	(2,513		)	(3,899		)
Acquisition (Note 3)	13,017			—
Effects of curtailment	(176		)	554
Settlement	(8,701		)	(4,925		)
Foreign exchange (gain) loss	(8,060		)	1,437
Projected benefit obligation at end of year	81,572			80,528
Change in plan assets:
Fair value of plan assets at beginning of year	58,146			48,801
Actual gain on plan assets	5,159			3,500
Employer contributions	1,120			8,687
Settlement	(8,701		)	(4,925		)
Benefits paid	(1,602		)	(1,168		)
Foreign exchange (loss) gain	(3,818		)	3,251
Fair value of plan assets at end of year	50,304			58,146
Funded status of the Plans at end of year	$	(31,268	)	$	(22,382	)

The accrued benefit liability, included in pension and severance obligations in the Consolidated Balance Sheets, as of December 31, 2013 and 2012 was $31.3 million and $22.4 million, respectively. The accumulated benefit obligation as of December 31, 2013 and 2012 was $55.9 million and $54.6 million, respectively.

81

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:

	Initial Net Obligation			Prior Service Cost			Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2011, net of tax ($1.4 million)	$	(58	)	$	(31	)	$	(10,421	)	$	(10,510	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	6			219			181			406
Net gain arising during period, net of tax (less than $0.1 million)	—			—			4,731			4,731
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.1 million)	6			219			4,912			5,137
Balance at December 31, 2012, net of tax ($1.3 million)	$	(52	)	$	188		$	(5,509	)	$	(5,373	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	8			250			106			364
Net gain arising during period, net of tax ($0.2 million)	—			—			3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.3 million)	8			250			4,102			4,360
Balance at December 31, 2013, net of tax ($1.0 million)	$	(44	)	$	438		$	(1,407	)	$	(1,013	)
Estimated amortization of cost to be included in 2014 net periodic pension cost	$	5		$	211		$	66		$	282

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

	December 31,
	2013		2012
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	73,326	$	80,528
Aggregate fair value of plan assets	41,957		58,146
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	24,877		17,816
Aggregate fair value of plan assets	—		—

82

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,909		$	6,362		$	5,744
Interest cost	3,170			3,270			3,274
Expected return on plan assets	(3,508		)	(3,188		)	(3,119		)
Amortization of transition obligation	7			7			8
Amortization of prior service cost	231			291			269
Recognized actuarial loss	135			218			83
Net periodic pension cost	5,944			6,960			6,259
Curtailment (gain) loss	(176		)	1,089			1,016
Settlement (gain) loss	(120		)	(100		)	565
Total pension expense	$	5,648		$	7,949		$	7,840

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligation at December 31, 2013, 2012 and 2011:

	For the Year Ended December 31,
	2013		2012		2011
Discount rate for determining net periodic pension cost	3.9	%	4.2	%	5.2	%
Discount rate for determining benefit obligations at year end	3.9	%	4.0	%	4.2	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.5	%	4.6	%
Rate of compensation increase for determining benefit obligations at year end	4.1	%	4.1	%	4.5	%
Expected rate of return on plan assets for determining net periodic pension cost	6.3	%	6.3	%	6.4	%

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 domestic and U.S.) and 45% equity securities (primarily U.S. and Europe). Philippine plan assets included Amkor common stock totaling $0.6 million and $0.4 million at December 31, 2013, and December 31, 2012, respectively.

83

AMKOR TECHNOLOGY, INC.

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 18, 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 fair value of our pension plan assets at December 31, 2012, by asset category utilizing the fair value hierarchy as discussed in Note 18, 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	$	1,348	$	—	$	1,348
Equity securities
Foreign securities	394		—		394
U.S. securities	9,046		—		9,046
	9,440		—		9,440
U.S. fixed income funds	1,714		—		1,714
Bonds
U.S. government bonds	2,070		6,448		8,518
Foreign government bonds	406		—		406
Foreign treasury notes	27,503		—		27,503
	29,979		6,448		36,427
Taiwan retirement fund	8,720		—		8,720
Other	377		120		497
Total	$	51,578	$	6,568	$	58,146

84

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.

Our other category of plan assets included receivables and payables at December 31, 2013 and December 31, 2012.

We contributed $1.1 million, $8.7 million and $3.6 million to the Plans during 2013, 2012 and 2011, respectively, and we expect to contribute $2.5 million during 2014. 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)
2014	$	2,663
2015	3,410
2016	2,901
2017	3,198
2018	4,047
2019 to 2023	33,275

16. Accumulated Other Comprehensive Income and Loss

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

	Defined Benefit Pension			Foreign Currency			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2011	$	(10,510	)	$	19,034		$	2,325		$	10,849
Other comprehensive income (loss) before reclassifications	4,731			(2,688		)	(2,057		)	(14		)
Amounts reclassified from accumulated other comprehensive (loss) income	406			—			—			406
Other comprehensive income (loss)	5,137			(2,688		)	(2,057		)	392
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	)

Amounts reclassified out of accumulated other comprehensive income are included as a component of net periodic pension cost (Note 15).

85

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

17. Treasury Stock

Stock Repurchase Program

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. The purchase of stock under the program may be made in the open market or through privately negotiated transactions. Since inception of the program, we have purchased a total of 45.0 million shares at an aggregate purchase price of $208.4 million, net of $0.9 million of commissions. 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, price, applicable legal requirements and other factors. Our stock repurchase program has been and is expected to be funded with available cash and may be suspended or discontinued at any time. All shares repurchased are recorded as treasury stock at cost.

During the year ended December 31, 2013, we made no purchases under the stock repurchase program. During the year ended December 31, 2012, we purchased 16.5 million shares of common stock for an aggregate purchase price of $79.5 million, net of $0.3 million of commissions, for an average price of $4.83. At December 31, 2013, approximately $91.6 million was available to repurchase common stock pursuant to the stock repurchase program. At December 31, 2013 and 2012, there were no unsettled shares.

Shares for Tax Withholding

We withheld 0.1 million shares for each of the years ended December 31, 2013 and 2012, from restricted shares that vested during the respective period to satisfy tax withholding obligations. Minimum tax withholding obligations that arose on the vesting of restricted shares were $0.5 million and $0.6 million for the years ended December 31, 2013 and 2012, respectively. These shares are reflected as treasury stock at cost.

18. 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.

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.

We also measure certain assets and liabilities, including property, plant and equipment, intangible assets and our investment in J-Devices, at fair value on a nonrecurring basis. For the year ended December 31, 2013, such measurements included the consideration of third party valuation reports based on a combination of market and cost approach valuation techniques. The valuation reports contained various inputs including semiconductor industry data, replacement costs, price lists and general information regarding the assets being evaluated. Nonrecurring fair value measurements related to property, plant and equipment impairments reflect the fair value of the assets at the dates the impairments were taken during the period.

86

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

Our fair value measurements consist of the following:

	December 31,
	2013		2012
	(In thousands)
Recurring fair value measurements:
Cash equivalent money market funds (Level 1)	$	300,352	$	151,066
Restricted cash money market funds (Level 1)	2,681		2,680
Nonrecurring fair value measurements:
Long-lived assets held for use or disposal (Level 3)	$	1,055	$	868

	Year Ended December 31,
	2013		2012		2011
	(In thousands)
Nonrecurring fair value measurements:
Losses on long-lived assets held for use or disposal (Level 3)	$	1,529	$	763	$	3,336

In 2013, $0.8 million of impairment losses were recorded in research and development expense, and $0.7 million were recorded in cost of sales. In 2012 and 2011, all impairment losses on property, plant and equipment were recorded in cost of sales.

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

	December 31, 2013				December 31, 2012
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,321,443	$	1,276,390	$	1,061,945	$	1,045,000
Convertible senior subordinated notes (Level 1)	102,585		56,350		371,975		250,000
Term loans (Level 2)	320,000		320,000		269,200		250,000
Total debt	$	1,744,028	$	1,652,740	$	1,703,120	$	1,545,000

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

87

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

19. Commitments and Contingencies

We have a letter of credit sub-facility of $25.0 million under our $150.0 million senior secured revolving credit facility that matures in June 2017. As of December 31, 2013, we had $0.3 million of standby letters of credit outstanding and had an additional $24.7 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. Except as indicated below, 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 involve disputes about whether or not Amkor owes Tessera royalties under the License Agreement with respect to certain packages and the termination of the License Agreement. The main proceeding that is pending is with the International Court of Arbitration of the International Chamber of Commerce (the “ICC”) captioned Amkor Technology, Inc. v. Tessera, Inc. (the “2009 Arbitration”), which we initiated in August 2009. In that proceeding, the ICC arbitration panel issued partial awards and interim orders finding that royalties are due to Tessera with respect to certain asserted patents and packages and that the License Agreement was terminated by Tessera as of February 17, 2011. The arbitration panel reserved for later decision the issues of the amount of royalties and pre-judgment interest due, and the allocation of costs. The other pending arbitration proceedings with Tessera include a request for arbitration by Tessera filed in May 2011 seeking undisclosed damages and a declaration that the License Agreement had been terminated, and a proceeding initiated in July 2012 with respect to claims related to three additional U.S. patents.

In July 2012, Tessera filed a complaint in the U.S. District Court for the District of Delaware. The complaint seeks injunctive relief and damages with respect to Amkor's alleged infringement of one of the U.S. patents (U.S. Patent No. 6,046,076, the "'076 patent") that the arbitration panel found to be royalty bearing in the 2009 Arbitration. In November 2013, the parties agreed to stay the Delaware litigation pending certain determinations in the 2009 Arbitration.

In February 2013, Tessera publicly announced its intention to seek an amount in excess of $150 million in the 2009 Arbitration. That same month, we filed a petition in the Superior Court for San Francisco County (the "California Action") to vacate or correct a portion of the arbitration panel’s interim order relating to the panel’s authority to award royalties for the period after the termination of the License Agreement. The Superior Court has denied our request and we have appealed that decision to the California First District Court of Appeal.

In April 2013, we initiated an inter partes review (the “IPR”) proceeding with the Patent Trial and Appeal Board at the United States Patent and Trademark Office (“U.S. PTO”), requesting it to find certain claims of the ‘076 patent unpatentable, including the claim we were found to infringe during the arbitration. In October 2013, the U.S. PTO determined that there is a reasonable likelihood that we will prevail in challenging that claim and certain others.

In November 2013, Tessera filed a motion to terminate the IPR proceeding on procedural grounds. In January 2014, the U.S. PTO denied Tessera’s motion and the proceeding is scheduled to go forward on the merits with a hearing in May 2014.

88

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

In October 2013 and January 2014, the arbitration panel issued additional interim orders which included, among other things, some substantive findings concerning the calculation of royalties under the License Agreement. In February 2014, Tessera filed a motion with the arbitration panel to enjoin us from proceeding with the IPR. We have filed a response with the arbitration panel requesting it to deny Tessera's motion and to stay a portion of the 2009 Arbitration pending final resolution of the IPR proceeding.

As a result of the latest interim order, we estimate the possible range of royalties due to Tessera in the 2009 Arbitration to be from $60 million to $135 million (excluding interest). Because we believe that no amount in the range constitutes a better estimate than any other amount within that range, we have recorded an aggregate charge to cost of goods sold of $60 million ($10.0 million in 2013 and $50.0 million in 2012), representing our estimate of the low end of the range of possible royalties owed to Tessera in respect of the 2009 Arbitration. Of the $60 million of charges we have recognized for royalties, we paid $16.7 million to Tessera in August 2012, plus related interest. As of December 31, 2013, our accrual for royalties for the 2009 Arbitration was $43.3 million, and our estimate of the possible range of royalties due to Tessera in respect of the 2009 Arbitration (net of the royalties paid in August 2012) is from $43.3 million to $118.3 million.

The ultimate amount of damages and interest we may owe to Tessera in connection with the several pending proceedings could be more or less than our estimate of the possible range of royalties due in the 2009 Arbitration. The final outcome of our litigation with Tessera depends upon a number of complex factors, including the panel's determination of which package families the patents apply to, whether those packages meet criteria previously laid out by the panel, overlaps among the packages, the final date through which royalties are applicable, whether we receive a favorable ruling in the California Action or IPR proceeding and other factors. We may adjust our accrual as information develops or upon the issuance of new rulings. We expect to record our estimate of interest accruing with the passage of time.

We strongly dispute Tessera's claims in these proceedings and intend to vigorously defend against them. However, the final outcome of these matters is uncertain, and an adverse result could have a material adverse effect on our results of operations, financial condition and cash flows.

Amkor Technology, Inc. v. Carsem (M) Sdn Bhd, Carsem Semiconductor Sdn Bhd, and Carsem Inc.

Since November 2003, we have been involved in several proceedings against Carsem (M) Sdn Bhd, Carsem Semiconductor Sdn Bhd, and Carsem Inc. (collectively “Carsem”) in which we allege that with its Carsem Dual and Quad Flat No-Lead Packages, Carsem has infringed on one or more of our MicroLeadFrame packaging technology patent claims. We initiated the action with the U.S International Trade Commission (the “ITC”) in Washington, D.C. seeking, under Section 337 of the Tariff Act of 1930, an exclusion order barring the importation by Carsem of infringing products. We also filed a complaint against Carsem in the U.S. District Court for the Northern District of California, alleging patent infringement and seeking an injunction, damages and costs. This District Court action has been stayed pending resolution of the ITC case.

The ITC determined that certain Carsem Dual and Quad Flat No-Lead Packages infringe some patent claims of Amkor's U.S. Patent No. 6,433,277 (the "277 Patent") but that these infringed claims are invalid and, as a result, there is no violation of the Tariff Act. We appealed the ITC's ruling of invalidity for the claims of the 277 Patent to the U.S. Court of Appeals for the Federal Circuit (the "Federal Circuit").

In 2012, the Federal Circuit reversed the ITC's determination of invalidity on the 277 Patent, denied Carsem's petition for a rehearing and remanded the matter to the ITC for further proceedings consistent with its ruling.

In January 2013, in response to Carsem, Inc.’s requests for reexamination of the 277 Patent, the U.S. PTO issued an Office Action rejecting all of the 277 Patent claims as invalid. Amkor believes that all of the 277 Patent claims are valid and filed a response to the Office Action in March 2013 contesting this finding. In January 2014, the U.S. PTO issued an Office Action maintaining the rejection of all claims of the 277 Patent as invalid. Amkor continues to believe its claims are valid and will respond to the Office Action accordingly.

89

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)
2014	$	23,380
2015	14,937
2016	4,116
2017	4,060
2018	4,031
Thereafter	6,445
Total	$	56,969

Rent expense amounted to $23.8 million, $13.2 million and $15.1 million for 2013, 2012 and 2011, 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 2014 through 2025 are $24.0 million.

20. Business Segments, Customer Concentrations and Geographic Information

Beginning with the three months ended December 31, 2013, we have operated as a single operating segment as managed by our Chief Executive Officer, who is considered our chief operating decision maker ("CODM"). The change in operating segments was made in connection with the appointment of our new Chief Executive Officer and other functional organization changes, including the consolidation of our test services business unit with the associated packaging services business units. 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,
	2013		2012		2011
	(In thousands)
Advanced products	$	1,451,664	$	1,302,145	$	1,124,701
Mainstream products	1,504,786		1,457,401		1,651,658
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

90

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,
	2013		2012		2011
	(In thousands)
Japan	$	394,834	$	349,360	$	340,302
Singapore	496,601		452,737		539,467
Thailand	116,376		139,134		111,748
Other foreign countries	743,425		675,365		697,229
Total foreign countries	1,751,236		1,616,596		1,688,746
United States	1,205,214		1,142,950		1,087,613
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

One customer accounted for 23.7%, 21.3% and 16.5% of consolidated net sales in 2013, 2012 and 2011, respectively. Another customer accounted for 10.5% of consolidated net sales in 2013, and another customer accounted for 11.3% of consolidated net sales in 2011.

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,
	2013		2012
	(In thousands)
China	$	524,967	$	409,822
Japan	10,799		17,545
Korea	916,777		907,844
Malaysia	61,080		—
Philippines	240,187		211,323
Taiwan	236,178		233,114
Other foreign countries	93		77
Total foreign countries	1,990,081		1,779,725
United States	16,472		40,244
Total property, plant and equipment, net	$	2,006,553	$	1,819,969

91

AMKOR TECHNOLOGY, INC.

Notes to Consolidated Financial Statements — (Continued)

21. 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 our exit activities and reduction in force initiatives associated with these efforts. “Charges” represents the initial charge related to the exit activity. “Cash Payments” consists of the utilization of “Charges.” “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	(In thousands)
Accrual at December 31, 2010	$	670
Charges, net	8,326
Cash Payments	(7,416		)
Non-cash Amounts	(1,580		)
Accrual at December 31, 2011	—
Charges, net	11,211
Cash Payments	(8,682		)
Non-cash Amounts	(922		)
Accrual at December 31, 2012	1,607
Charges, net	10,506
Cash Payments	(12,531		)
Non-cash Amounts	418
Accrual at December 31, 2013	$	—

Reductions in Force

During 2013, we reduced our workforce through workforce reduction programs. We recorded $10.5 million in net charges, of which $9.2 million and $1.3 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts were paid as of December 31, 2013.

During 2012, we reduced our workforce through workforce reduction programs. We recorded $11.2 million in net charges including $1.0 million in net curtailment and settlement charges, of which $7.3 million and $3.9 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts accrued at December 31, 2012 were classified in current liabilities.

During 2011, we reduced our workforce through a workforce reduction program. As a result, we recorded $8.3 million in net charges including $1.6 million in net curtailment and settlement charges, of which $7.7 million and $0.6 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts were paid as of December 31, 2011.

92

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, 2011	$	223,612	(509	)	(8,163	)	(671	)	$	214,269
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

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

93

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, 2013, 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, 2013, 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, 2013, based on criteria in Internal Control — Integrated Framework (1992) issued by the COSO. However, in conducting our evaluation, we excluded Amkor Technology Malaysia Sdn. Bhd., acquired on July 31, 2013 as permitted by the Securities and Exchange Commission Staff. Amkor Technology Malaysia Sdn. Bhd. constituted approximately 4% of total assets as of December 31, 2013, and approximately 2% of net sales for the year then ended.

The effectiveness of our internal control over financial reporting as of December 31, 2013, 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.

94

Changes in Internal Control Over Financial Reporting

On July 31, 2013, we completed our acquisition of Amkor Technology Malaysia Sdn. Bhd. We have extended our oversight and monitoring processes that support internal control over financial reporting to include the acquired operations. We are continuing to integrate the acquired operations into our overall internal control over financial reporting. As previously reported, we continue to implement an enterprise resource planning (“ERP”) system over a multi-year program on a company-wide basis. In addition, we are also implementing a new shop floor management system in certain of our factories.

During the three months ended December 31, 2013, 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 2014 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 2014 Annual Meeting of Stockholders.

95

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 2014 Annual Meeting of Stockholders.

EQUITY COMPENSATION PLANS

The following table summarizes our equity compensation plans as of December 31, 2013:

	(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 plans approved by stockholders (1)	4,873	$	6.52	11,580
Equity compensation plans not approved by stockholders (2)	—	—		471
Total equity compensation plans	4,873			12,051

(1) As of December 31, 2013, a total of 11.6 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.

(2) As of December 31, 2013, a total of 0.5 million shares were reserved for issuance under the 2003 Nonstatutory Inducement Grant Stock Plan, and there is a provision in this plan that restores the number of shares of common stock reserved for issuance under the plan to 0.3 million as of each January 1. On January 1, 2014, no additional shares were added to the plan pursuant to the annual restoration provision.

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 2014 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 2014 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.

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 28, 2014

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 28, 2014
Stephen D. Kelley
/s/  Joanne Solomon	Executive Vice President and Chief Financial Officer	February 28, 2014
Joanne Solomon
/s/  James J. Kim	Executive Chairman	February 28, 2014
James J. Kim
/s/  John T. Kim	Vice Chairman	February 28, 2014
John T. Kim
/s/  Roger A. Carolin	Director	February 28, 2014
Roger A. Carolin
/s/  Winston J. Churchill	Director	February 28, 2014
Winston J. Churchill

97

Name	Title	Date
/s/  Robert R. Morse	Director	February 28, 2014
Robert R. Morse
/s/  John F. Osborne	Director	February 28, 2014
John F. Osborne
/s/  James W. Zug	Director	February 28, 2014
James W. Zug

98

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.
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.(17)
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.(14)*
10.9	Form of Stock Option Agreement under the Amended and Restated 2007 Equity Incentive Plan.(16)*
10.10	Form of Restricted Stock Award Agreement under the Amended and Restated 2007 Equity Incentive Plan. (16)*
10.11	Executive Incentive Bonus Plan.(14)*
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.(15)
10.15	Amendment to Kun-Mortgage Agreement, dated May 24, 2010, by and between Amkor Technology Korea, Inc. and Woori Bank.(10)
10.16	Credit Facility Agreement, dated March 20, 2012, by and between Amkor Technology Korea, Inc. and Woori Bank.(13)
10.17	General Terms and Conditions for Bank Credit Transactions, dated March 20, 2012, between Woori Bank and Amkor Technology Korea, Inc.(13)
10.18	Loan Agreement, dated June 28, 2012, by and between Amkor Technology Korea, Inc. and The Korea Development Bank (15)

99

10.19	Factory Mortgage Agreement, dated June 28, 2012, by and between The Korea Development Bank and Amkor Technology Korea, Inc.(15)
10.20	Loan Agreement, dated November 23, 2012, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(18)
10.21	Form of Amendment to Factory Mortgage Agreement, dated November 23, 2012, by and between The Korea Development Bank and Amkor Technology Korea, Inc.(18)
10.22	Amendment to Loan Agreement, dated November 22, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank
10.23	Credit Facility Agreement, dated March 11, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank (19)
10.24	General Terms and Conditions for Bank Credit Transactions, dated March 11, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank (19)
10.25	Loan Agreement, dated April 29, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(22)
10.26	Amendment to Factory Mortgage Agreement, dated April 29, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank.(22)
10.27	Guarantee, dated April 29, 2013, by and between Amkor Technology, Inc. and The Korea Development Bank.(22)
10.28	Amendment to Loan Agreement, dated December 27, 2013, by and between Amkor Technology Korea, Inc. and The Korea Development Bank
10.29	Amendment to Kun Mortgage Agreement, dated April 19, 2013, by and between Amkor Technology Korea, Inc. and Woori Bank.(22)
10.30	Severance Agreement and Release, dated May 23, 2011, by and between James Fusaro and Amkor Technology, Inc.(12)*
10.31	Employment Offer Letter, dated April 30, 2013, between Amkor Technology, Inc. and Stephen D. Kelley.(20)*
10.32	Retirement Agreement and Release, dated May 8, 2013, between Amkor Technology, Inc. and Kenneth T. Joyce.(21)*
10.33	Separation and Consulting Agreement, dated July 17, 2013, between Amkor Technology, Inc. and Michael J. Lamble.(22)*
12.1	Computation of Ratio of Earnings to Fixed Charges
21.1	List of subsidiaries of the Registrant.
23.1	Consent of PricewaterhouseCoopers LLP.
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.
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.
**	This information is furnished and not filed or a part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise is not subject to liability under these sections.

100

(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 Quarterly Report on Form 10-Q filed August 4, 2011.
(13	)	Incorporated by reference to the Company's Current Report on Form 8-K filed March 23, 2012.
(14	)	Incorporated by reference to the Company's Proxy Statement on Schedule 14A filed April 5, 2012.
(15	)	Incorporated by reference to the Company's Current Report on Form 8-K filed on July 2, 2012.
(16	)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed August 2, 2012.
(17	)	Incorporated by reference to the Company's Current Report on Form 8-K filed September 21, 2012.
(18	)	Incorporated by reference to the Company's Current Report on Form 8-K filed November 27, 2012.
(19	)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed May 3, 2013.
(20	)	Incorporated by reference to the Company's Current Report on Form 8-K filed May 3, 2013.
(21	)	Incorporated by reference to the Company's Current Report on Form 8-K filed May 10, 2013.
(22	)	Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed August 2, 2013.

101

EX-3.3

RESTATED BYLAWS

OF

AMKOR TECHONOLOGY, INC.

(as of November 5, 2013)

TABLE OF CONTENTS

		Page
ARTICLE I STOCKHOLDERS		1
1.1	ANNUAL MEETINGS	1
1.2	SPECIAL MEETINGS	1
1.3	NOTICE OF MEETINGS	1
1.4	NOMINATIONS	2
1.5	NOTICE OF STOCKHOLDER BUSINESS	3
1.6	ADJOURNMENTS	4
1.7	QUORUM	5
1.8	ORGANIZATION	5
1.9	VOTING; PROXIES	6
1.10	REMOTE COMMUNICATION	6
1.11	FIXING DATE FOR DETERMINATION OF STOCKHOLDERS OF RECORD	7
1.12	LIST OF STOCKHOLDERS ENTITLED TO VOTE	7
1.13	STOCKHOLDER ACTION BY WRITTEN CONSENT WITHOUT A MEETING	8
ARTICLE II BOARD OF DIRECTORS		8
2.1	POWERS; NUMBER; QUALIFICATIONS	8
2.2	ELECTION; RESIGNATION; REMOVAL; VACANCIES	9
2.3	REGULAR MEETINGS	9
2.4	SPECIAL MEETINGS	9
2.5	TELEPHONIC MEETINGS PERMITTED	9
2.6	QUORUM; VOTE REQUIRED FOR ACTION	9
2.7	ORGANIZATION	10
2.8	BOARD ACTION BY WRITTEN CONSENT WITHOUT A MEETING	10
ARTICLE III COMMITTEES		11
3.1	COMMITTEES	11
3.2	COMMITTEE RULES	11
ARTICLE IV OFFICERS		11
4.1	EXECUTIVE OFFICERS; ELECTION; QUALIFICATIONS; TERM OF OFFICE; RESIGNATION; REMOVAL; VACANCIES	11
ARTICLE V STOCK		12
5.1	CERTIFICATES	12
5.2	LOST, STOLEN OR DESTROYED STOCK CERTIFICATES; ISSUANCE OF NEW CERTIFICATES	12

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TABLE OF CONTENTS

		Page
ARTICLE VI INDEMNIFICATION		13
6.1	THIRD PARTY ACTIONS	13
6.2	ACTIONS BY OR IN THE RIGHT OF THE CORPORATION	13
6.3	SUCCESSFUL DEFENSE	14
6.4	DETERMINATION OF CONDUCT	14
6.5	PAYMENT OF EXPENSES IN ADVANCE	14
6.6	INDEMNITY NOT EXCLUSIVE	14
6.7	INSURANCE INDEMNIFICATION	14
6.8	THE CORPORATION	15
6.9	EMPLOYEE BENEFIT PLANS	15
6.10	INDEMNITY FUND	15
6.11	INDEMNIFICATION OF OTHER PERSONS	15
6.12	SAVINGS CLAUSE	16
6.13	CONTINUATION OF INDEMNIFICATION AND ADVANCEMENT OF EXPENSES	16
ARTICLE VII MISCELLANEOUS		16
7.1	FISCAL YEAR	16
7.2	SEAL	16
7.3	WAIVER OF NOTICE OF MEETINGS OF STOCKHOLDERS, DIRECTORS AND COMMITTEES	16
7.4	INTERESTED DIRECTORS; QUORUM	17
7.5	FORM OF RECORDS	17
7.6	AMENDMENT OF BYLAWS	17
ARTICLE VIII EXCLUSIVE FORUM		18
8.1	EXCLUSIVE FORUM	18

-ii-

RESTATED BYLAWS

OF

AMKOR TECHNOLOGY, INC.

ARTICLE I

STOCKHOLDERS

1.1ANNUAL MEETINGS

An annual meeting of stockholders shall be held for the election of directors at such date, time and place, either within or without the state of Delaware, as may be designated by resolution of the Board of Directors from time to time. Any other proper business may be transacted at the annual meeting. In lieu of holding an annual meeting of stockholders at a designated place, the Board of Directors may, in its sole discretion, determine that any annual meeting of stockholders may be held solely by means of remote communication.

1.2SPECIAL MEETINGS

Special meetings of stockholders for any purpose or purposes may be called at any time by the Board of Directors, or by a committee of the Board of Directors which has been duly designated by the Board of Directors and whose powers and authority, as expressly provided in a resolution of the Board of Directors, include the power to call such meetings. In lieu of holding a special meeting of stockholders at a designated place, the Board of Directors may, in its sole discretion, determine that any special meeting of stockholders may be held solely by means of remote communication.

1.3NOTICE OF MEETINGS

Whenever stockholders are required or permitted to take any action at a meeting, a written notice of the meeting shall be given which shall state the place, date and hour of the meeting, the means of remote communications, if any, by which stockholders and proxy holders may be deemed to be present and in person and vote at such meeting, and, in the case of a special meeting, the purpose or purposes for which the meeting is called. Unless otherwise provided by law, the Certificate of Incorporation or these Bylaws, the written notice of any meeting shall be given not less than ten (10) nor more than sixty (60) days before the date of the meeting to each stockholder entitled to vote at such meeting. Notice to stockholders may be given by personal delivery, mail, or, with the consent of the stockholder entitled to receive notice, by facsimile or other means of electronic transmission. If mailed, such notice shall be deemed to be given when deposited in the mail, postage prepaid, directed to the stockholder at his address as it appears on the records of the corporation. Notice given by electronic transmission pursuant to this subsection shall be deemed given: (1) if by facsimile telecommunication, when directed to a facsimile telecommunication number at which the stockholder has consented to receive notice; (2) if by electronic mail, when directed to an electronic mail address at which the stockholder has

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consented to receive notice; (3) if by posting on an electronic network together with separate notice to the stockholder of such specific posting, upon the later of (A) such posting and (B) the giving of such separate notice; and (4) if by any other form of electronic transmission, when directed to the stockholder. An affidavit of the Secretary or an Assistant Secretary, the transfer agent or other agent of the corporation that the notice has been given by personal delivery, by mail, or by a form of electronic transmission shall, in the absence of fraud, be prima facie evidence of the facts stated therein.

1.4NOMINATIONS

Only persons who are nominated in accordance with the procedures set forth in these Bylaws shall be eligible to serve as directors of the corporation. Nominations of persons for election to the Board of Directors of the corporation may be made at a meeting of stockholders at which directors are to be elected (i) by or at the direction of the Board of Directors or (ii) by any stockholder of the corporation who is a stockholder of record at the time of giving of notice provided for in this Section 1.4, who shall be entitled to vote for the election of directors at the meeting and who complies with the notice procedures set forth in this Section 1.4.

Nominations by stockholders shall be made pursuant to timely notice in writing to the Secretary of the corporation. To be timely, a stockholder's notice shall be delivered to or mailed and received at the principal executive offices of the corporation (a) in the case of an annual meeting, not later than the close of business on the ninetieth (90^th ) calendar day, nor earlier than the close of business on the one hundred and twentieth (120^th ) calendar day, prior to the first anniversary of the preceding year's annual meeting; provided, however, that if the date of the annual meeting is advanced more than thirty (30) calendar days prior to, or delayed by more than sixty (60) calendar days after, the anniversary of the preceding year's annual meeting, notice by the stockholder to be timely must be received not later than the close of business on the tenth (10^th) calendar day following the earlier of the day on which notice of the date of the meeting was first mailed or public disclosure of the date of the meeting was first made, and (b) in respect of nominations to be brought before a special meeting, where permitted, notice by the stockholder to be timely must be so delivered not later than the close of business on the tenth (10^th) calendar day following the earlier of the day on which notice of the date of the meeting was first mailed or public disclosure of the date of the meeting was first made. Such stockholder's notice shall set forth (i) (A) the name, age, business address and residence address of each proposed nominee, (B) the principal occupation of each proposed nominee, (C) a representation that the notifying stockholder intends to appear in person or by proxy at the meeting to nominate the person or persons specified in the notice, (D) if known, the class and total number of shares of the corporation that are beneficially owned by the proposed nominee, (E) the total number of shares of the corporation that will be voted by the notifying stockholder for each proposed nominee, (F) a description of all arrangements or understandings between the notifying stockholder and each nominee and any other person or persons (naming such person or persons) pursuant to which the nomination or nominations are to be made by the notifying stockholder, and (G) as to each proposed nominee all information relating to such person that is required to be disclosed in solicitations of proxies for election of directors, or is otherwise

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required, in each case pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, applicable listing standards and other applicable law (including such person's written consent to being named in the proxy statement as a nominee and to serving as a director if elected and including information as to the purpose of such nomination); and (ii) as to the stockholder giving the notice and the beneficial owner, if any, on whose behalf the nomination is made (A) the name and address of such stockholder, as they appear on the corporation's books, and of such beneficial owner, (B) the class and number of shares of the corporation which are owned beneficially and of record by such stockholder and such beneficial owner and (C) a representation whether the stockholder or the beneficial owner, if any, intends or is part of a group which intends (x) to deliver a proxy statement and/or form of proxy to holders of at least the percentage of the corporation's outstanding capital stock required to elect the nominee and/or (y) otherwise to solicit proxies from stockholders in support of such nomination. At the request of the Board of Directors, any person nominated by a stockholder for election as a director shall furnish to the Secretary of the corporation that information required to be set forth in a stockholder's notice of nomination which pertains to the nominee. The corporation may request any proposed nominee to furnish such other information as may reasonably be required by the corporation to determine the qualifications of the proposed nominee to serve as a director of the corporation.

No person shall be eligible to serve as a director of the corporation unless nominated in accordance with the procedures set forth in this Section 1.4. The Chairman of the meeting shall, if the facts warrant, determine and declare to the meeting that a nomination was not made in accordance with the procedures prescribed by this Section 1.4, and if the Chairman of the meeting should so determine, shall so declare to the meeting and the defective nomination shall be disregarded. Any such decision by the Chairman of the meeting shall be final, binding and conclusive upon all parties in interest. In addition to the foregoing provisions of this Section 1.4, a stockholder shall also comply with and shall be subject to all applicable requirements and provisions of the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder, applicable listing standards and other applicable law, with respect to the matters set forth in this Section 1.4.

1.5NOTICE OF STOCKHOLDER BUSINESS

At an annual or special meeting of the stockholders, only such business shall be conducted as shall have been brought before the meeting (i) pursuant to the corporation's notice of meeting, (ii) by or at the direction of the Board of Directors or (iii) as to an annual meeting, by any stockholder of the corporation who is a stockholder of record at the time of giving of the notice provided for in this Section 1.5, who shall be entitled to vote at such meeting and who complies with the notice procedures set forth in this Section 1.5.

For business to be properly brought before an annual meeting by a stockholder pursuant to clause (iii) of the immediately preceding paragraph of this Section 1.5, the stockholder must have given timely notice thereof in writing to the Secretary of the corporation, and any such proposed business must constitute a proper matter for stockholder action. To be timely, a stockholder's notice shall be delivered to or mailed and received at the principal executive offices

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of the corporation not later than the close of business on the ninetieth (90^th) calendar day, nor earlier than the close of business on the one hundred and twentieth (120^th) calendar day, prior to the first anniversary of the preceding year's annual meeting; provided, however, that if the date of the annual meeting is advanced more than thirty (30) calendar days prior to, or delayed by more than sixty (60) calendar days after, the first anniversary of the preceding year's annual meeting, notice by the stockholder to be timely must be so delivered not later than the close of business on the tenth (10^th) calendar day following the earlier of the day on which notice of the date of the meeting was first mailed or public disclosure of the date of the meeting was first made. A stockholder's notice to the Secretary shall set forth as to each matter the stockholder proposes to bring before the meeting (i) a brief description of the business desired to be brought before the meeting and the reasons for conducting such business at the meeting, and if a specific action is to be proposed, the text of the resolution or resolutions which the stockholder proposes that the corporation adopt, (ii) the name and address, as they appear on the corporation's books, of the stockholder proposing such business, and the name and address of the beneficial owner, if any, on whose behalf the proposal is made, (iii) the class and number of shares of the corporation which are owned beneficially and of record by such stockholder of record and by the beneficial owner, if any, on whose behalf the proposal is made, (iv) any material interest of such stockholder of record and the beneficial owner, if any, on whose behalf the proposal is made in such business, (v) a representation that the stockholder intends to appear in person or by proxy at the meeting to bring before the meeting the business specified in the notice, (vi) the total number of shares of the corporation that will be voted by the notifying stockholder for such proposal, and (vii) a representation whether the stockholder or the beneficial owner, if any, intends or is part of a group which intends (x) to deliver a proxy statement and/or form of proxy to holders of at least the percentage of the corporation's outstanding capital stock required to approve or adopt the proposal and/or (y) otherwise to solicit proxies from stockholders in support of such proposal.

Notwithstanding anything in these Bylaws to the contrary, no business shall be conducted at an annual or special meeting except in accordance with the procedures set forth in Section 1.5. The Chairman of the meeting shall, if the facts warrant, determine and declare to the meeting that business was not properly brought before the meeting and in accordance with the procedures prescribed by this Section 1.5, and if the Chairman of the meeting should so determine, shall so declare to the meeting and any such business not properly brought before the meeting shall not be transacted. Any such decision by the Chairman shall be final, binding and conclusive upon all parties in interest. In addition to the foregoing provisions of this Section 1.5, a stockholder shall also comply with and be subject to all applicable requirements and provisions of the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder, applicable listing standards and other applicable law, with respect to the matters set forth in this Section 1.5.

1.6ADJOURNMENTS

Any meeting of stockholders, annual or special, may adjourn from time to time to reconvene at the same or some other place, and notice need not be given of any such adjourned meeting if the date, time and place if any, thereof and the means of remote communication, if any, by which stockholders and proxyholders may be deemed to be present in person and vote at

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such adjourned meeting, are announced at the meeting at which the adjournment is taken. At the adjourned meeting the corporation may transact any business which might have been transacted at the original meeting. If the adjournment is for more than thirty (30) days, or if after the adjournment a new record date is fixed for the adjourned meeting, a notice of the adjourned meeting shall be given to each stockholder of record entitled to vote at the meeting. The Chairman of the meeting shall have the power to adjourn any meeting of stockholders for any reason and the stockholders shall have the power to adjourn any meeting of stockholders by a majority vote of the shares present at such meeting in accordance with this Section 1.6.

1.7QUORUM

Except as otherwise provided by law, the Certificate of Incorporation or these Bylaws, at each meeting of stockholders the presence in person or by proxy of the holders of shares of stock having a majority of the votes which could be cast by the holders of all outstanding shares of stock entitled to vote at the meeting shall be necessary and sufficient to constitute a quorum. In the absence of a quorum, the stockholders so present may, by majority vote of shares present, adjourn the meeting from time to time in the manner provided in Section 1.6 of these Bylaws until a quorum shall attend. Shares of its own stock belonging to the corporation or to another corporation, if a majority of the shares entitled to vote in the election of directors of such other corporation is held, directly or indirectly, by the corporation, shall neither be entitled to vote nor be counted for quorum purposes; provided, however, that the foregoing shall not limit the right of the corporation to vote stock, including but not limited to its own stock, held by it in a fiduciary capacity.

1.8ORGANIZATION

Meetings of stockholders shall be presided over by (a) the Chairman of the Board of Directors or, in the absence thereof, (b) any director or officer of the corporation designated by the Board of Directors. In the absence of the Secretary of the corporation, the secretary of the meeting shall be such person as the Chairman of the meeting appoints.

The Board of Directors shall, in advance of any meeting of stockholders, appoint one (1) or more inspector(s), who may include individual(s) who serve the corporation in other capacities, including without limitation as officers, employees or agents, to act at the meeting of stockholders and make a written report thereof. The Board may designate one (1) or more persons as alternate inspector(s) to replace any inspector, who fails to act. If no inspector or alternate has been appointed or is able to act at a meeting of stockholders, the Chairman of the meeting shall appoint one (1) or more inspector(s) to act at the meeting. Each inspector, before discharging his or her duties, shall take and sign an oath to faithfully execute the duties of inspector with strict impartiality and according to the best of his or her ability. The inspector(s) or alternate(s) shall have the duties prescribed pursuant to Section 231 of the Delaware General Corporation Law or other applicable law.

The Board of Directors shall be entitled to make such rules or regulations for the conduct of meetings of stockholders as it shall deem necessary, appropriate or convenient. Subject to

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such rules and regulations, if any, the Chairman of the meeting shall have the right and authority to prescribe such rules, regulations and procedures and to do all acts as, in the judgment of such Chairman of the meeting, are necessary, appropriate or convenient for the proper conduct of the meeting, including without limitation establishing an agenda of business of the meeting, rules or regulations to maintain order, restrictions on entry to the meeting after the time fixed for commencement thereof and the fixing of the date and time of the opening and closing of the polls for each matter upon which the stockholders will vote at a meeting (and shall announce such at the meeting).

1.9VOTING; PROXIES

Except as otherwise provided by the Certificate of Incorporation or by law, each stockholder entitled to vote at any meeting of stockholders shall be entitled to one vote for each share of stock held by such stockholder which has voting power upon the matter in question. Each stockholder entitled to vote at a meeting of stockholders may authorize another person or persons to act for such stockholder by proxy, but no such proxy shall be voted or acted upon after three years from its date, unless the proxy provides for a longer period. A duly executed proxy shall be irrevocable if it states that it is irrevocable and if, and only as long as, it is coupled with an interest sufficient in law to support an irrevocable power. A stockholder may revoke any proxy which is not irrevocable by attending the meeting and voting in person or by filing an instrument in writing revoking the proxy or another duly executed proxy bearing a later date with the Secretary of the corporation. Voting at meetings of stockholders need not be by written ballot and need not be conducted by inspectors of election unless so determined by the holders of shares of stock having a majority of the votes which could be cast by the holders of all outstanding shares of stock entitled to vote thereon which are present in person or by proxy at such meeting.

At a stockholders' meeting at which directors are to be elected, a stockholder shall not be entitled to cumulate votes (i.e., cast for any candidate a number of votes greater than the number of votes which such stockholder normally is entitled to cast). The candidates receiving the highest number of affirmative votes, up to the number of directors to be elected, shall be elected; votes against any candidate and votes withheld shall have no legal effect.

1.10REMOTE COMMUNICATION

For the purposes of these Bylaws, if authorized by the Board of Directors in its sole discretion, and subject to such guidelines and procedures as the Board of Directors may adopt, stockholders and proxyholders may, by means of remote communication:

(A)    participate in a meeting of stockholders; and

(B)    be deemed present in person and vote at a meeting of stockholders whether such meeting is to be held at a designated place or solely by means of remote communication, provided that (i) the corporation shall implement reasonable measures to verify that each person deemed present and permitted to vote at the meeting by means of remote communication is a

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stockholder or proxyholder, (ii) the corporation shall implement reasonable measures to provide such stockholders and proxyholders a reasonable opportunity to participate in the meeting and to vote on matters submitted to the stockholders, including an opportunity to read or hear the proceedings of the meeting substantially concurrently with such proceedings, and (iii) if any stockholder or proxyholder votes or takes other action at the meeting by means of remote communication, a record of such vote or other action shall be maintained by the corporation.

1.11FIXING DATE FOR DETERMINATION OF STOCKHOLDERS OF RECORD

In order that the corporation may determine the stockholders entitled to notice of or to vote at any meeting of stockholders or any adjournment thereof, or to express consent to corporate action in writing without a meeting, or entitled to receive payment of any dividend or other distribution or allotment of any rights, or entitled to exercise any rights in respect of any change, conversion or exchange of stock or for the purpose of any other lawful action, the Board of Directors may fix a record date, which record date shall not precede the date upon which the resolution fixing the record date is adopted by the Board of Directors and which record date: (1) in the case of determination of stockholders entitled to vote at any meeting of stockholders or adjournment thereof, shall, unless otherwise required by law, not be more than sixty (60) nor less than ten (10) days before the date of such meeting; (2) in the case of determination of stockholders entitled to express consent to corporate action in writing without a meeting, shall not be more than ten (10) days from the date upon which the resolution fixing the record date is adopted by the Board of Directors; and (3) in the case of any other action, shall not be more than sixty (60) days prior to such other action. If no record date is fixed: (1) the record date for determining stockholders entitled to notice of or to vote at a meeting of stockholders shall be at the close of business on the day next preceding the day on which notice is given, or, if notice is waived, at the close of business on the day next preceding the day on which the meeting is held; (2) the record date for determining stockholders entitled to express consent to corporate action in writing without a meeting, when no prior action of the Board of Directors is required by law, shall be the first date on which a signed written consent setting forth the action taken or proposed to be taken is delivered to the Corporation in accordance with applicable law, or, if prior action by the Board of Directors is required by law, shall be at the close of business on the day on which the Board of Directors adopts the resolution taking such prior action; and (3) the record date for determining stockholders for any other purpose shall be at the close of business on the day on which the Board of Directors adopts the resolution relating thereto. A determination of stockholders of record entitled to notice of or to vote at a meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board of Directors may fix a new record date for the adjourned meeting.

1.12LIST OF STOCKHOLDERS ENTITLED TO VOTE

The Secretary shall prepare and make, at least ten (10) days before every meeting of stockholders, a complete list of the stockholders entitled to vote at the meeting, arranged in alphabetical order, and showing the address of each stockholder and the number of shares registered in the name of each stockholder. Such list shall be open to the examination of any stockholder, for any purpose germane to the meeting, during ordinary business hours, for a

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period of at least ten (10) days prior to the meeting, either (a) on a reasonably accessible electronic network, provided that the information required to gain access to such list is provided with the notice of the meeting, or (b) during ordinary business hours, at the principal place of business of the corporation. In the event that the corporation determines to make the list available on an electronic network, the corporation may take reasonable steps to ensure that such information is available only to stockholders of the corporation. The list shall also be produced and kept at the time and place of the meeting during the whole time thereof and may be inspected by any stockholder who is present. If the meeting is to be held solely by means of remote communication, then the list shall also be open to the examination of any stockholder during the whole time of the meeting on a reasonably accessible electronic network, and the information required to access such list shall be provided with the notice of the meeting. The stock ledger shall be the only evidence as to who are the stockholders entitled to examine the stock ledger, the list of stockholders or the books of the corporation, or to vote in person or by proxy at any meeting of stockholders.

1.13STOCKHOLDER ACTION BY WRITTEN CONSENT WITHOUT A MEETING

Unless otherwise provided in the certificate of incorporation, any action required by this chapter to be taken at any annual or special meeting of stockholders of a corporation, or any action that may be taken at any annual or special meeting of such stockholders, may be taken without a meeting, without prior notice, and without a vote if a consent in writing, setting forth the action so taken, is signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted.

Prompt notice of the taking of the corporate action without a meeting by less than unanimous written consent shall be given to those stockholders who have not consented in writing. If the action which is consented to is such as would have required the filing of a certificate under any section of the Delaware General Corporation Law if such action had been voted on by stockholders at a meeting thereof, then the certificate filed under such section shall state, in lieu of any statement required by such section concerning any vote of stockholders, that written notice and written consent have been given as provided in Section 228 of the Delaware General Corporation Law.

ARTICLE II

BOARD OF DIRECTORS

2.1POWERS; NUMBER; QUALIFICATIONS

The business and affairs of the corporation shall be managed by or under the direction of the Board of Directors. In addition to the power and authorities these Bylaws expressly confer upon them, the Board of Directors may exercise all such powers of the corporation and do all such lawful acts and things as are not required by statute, the Certificate of Incorporation or these Bylaws to be exercised or done by the stockholders. The Board of Directors shall consist of one

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or more members, the number thereof to be determined from time to time by resolution of the Board of Directors. Directors need not be stockholders.

2.2ELECTION; RESIGNATION; VACANCIES

The Board of Directors shall initially consist of the persons named as directors in the Certificate of Incorporation, and each director so elected shall hold office until the first annual meeting of stockholders or until his successor is elected and qualified. At the first annual meeting of stockholders and at each annual meeting thereafter, the stockholders shall elect directors each of whom shall hold office until his successor is elected and qualified or until such director’s earlier resignation or removal. Any director may resign at any time upon written notice to the corporation. Any newly created directorship or any vacancy occurring in the Board of Directors for any cause may be filled by a majority of the remaining members of the Board of Directors, although such majority is less than a quorum, or by a sole remaining director, or by a plurality of the votes cast at a meeting of stockholders, and each director so elected shall hold office until the expiration of the term of office of the director whom he has replaced or until his successor is elected and qualified.

2.3REGULAR MEETINGS

Regular meetings of the Board of Directors may be held at such places within or without the State of Delaware and at such times as the Board of Directors may from time to time determine, and if so determined notices thereof need not be given.

2.4SPECIAL MEETINGS

Special meetings of the Board of Directors may be held at any time or place within or without the State of Delaware whenever called by the Chief Executive Officer, President, Chief Financial Officer, or by any member of the Board of Directors. Notice of a special meeting of the Board of Directors shall be given by the person or persons calling the meeting at least twenty-four hours before the special meeting.

2.5TELEPHONIC MEETINGS PERMITTED

Members of the Board of Directors, or any committee designated by the Board of Directors, may participate in a meeting thereof by means of conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other, and participation in a meeting pursuant to this Bylaw shall constitute presence in person at such meeting.

2.6    QUORUM; VOTE REQUIRED FOR ACTION

At all meetings of the Board of Directors a majority of the whole Board of Directors shall constitute a quorum for the transaction of business. Except in cases in which the Certificate of Incorporation or these Bylaws otherwise provide, the vote of a majority of the directors present at a meeting at which a quorum is present shall be the act of the Board of Directors.

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2.7ORGANIZATION

The Chairman of the Board shall, if present, preside at each meeting of the stockholders and of the Board and shall perform such other duties and responsibilities set forth in these Bylaws or as may be determined by the Board of Directors from time to time.

The Vice Chairman of the Board, if any, shall assist the Chairman of the Board and have such other duties and responsibilities set forth in these Bylaws or as may be determined by the Board of Directors or the Chairman of the Board from time to time.

If at any time the Chairman of the Board is not independent as that term is defined under the then applicable rules and regulations of each national securities exchange upon which shares of the common stock of the corporation are listed for trading and of the Securities and Exchange Commission, the independent directors shall annually designate from among them a “Lead Independent Director” having the duties and responsibilities set forth in the corporation’s Corporate Governance Guidelines and as otherwise determined by the Board of Directors from time to time.

Meetings of the Board of Directors shall be presided over by the Chairman of the Board, if any, or in his absence by the Vice Chairman of the Board, if any, or in their absence by the Lead Independent Director, if any, or in the case of absence by all such persons, a chairman chosen at the meeting. The Secretary shall act as secretary of the meeting, but in his absence the chairman of the meeting may appoint any person to act as secretary of the meeting.

The corporation may have, at the discretion of the Board of Directors, an Executive Chairman of the Board. The Executive Chairman shall, if one is designated by the Board of Directors and if present, preside at all meetings of the stockholders and of the Board of Directors, assist the directors and the senior officers of the corporation in the formulation of the strategy and policies of the corporation, shall be available to the officers for consultation and advice, and exercise and perform such other powers and duties as may be from time to time assigned by the Board of Directors. The Executive Chairman, if so designated by the Board of Directors, shall not be considered an officer of the corporation.

2.8BOARD ACTION BY WRITTEN CONSENT WITHOUT A MEETING

Unless otherwise restricted by the Certificate of Incorporation or these Bylaws, any action required or permitted to be taken at any meeting of the Board of Directors, or of any committee thereof, may be taken without a meeting if all members of the Board of Directors or such committee, as the case may be, consent thereto in writing, and the writing or writings are filed with the minutes of proceedings of the Board of Directors or such committee.

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ARTICLE III

COMMITTEES

3.1COMMITTEES

The Board of Directors may, by resolution passed by a majority of the whole Board of Directors, designate one or more committees, each committee to consist of one or more of the directors of the corporation. The Board of Directors may designate one or more directors as alternate members of any committee, who may replace any absent or disqualified member at any meeting of the committee. In the absence or disqualification of a member of the committee, the member or members thereof present at any meeting and not disqualified from voting, whether or not he or they constitute a quorum, may unanimously appoint another member of the Board of Directors to act at the meeting in place of any such absent or disqualified member. Any such committee, to the extent permitted by law and to the extent provided in the resolution of the Board of Directors, shall have and may exercise all the powers and authority of the Board of Directors in the management of the business and affairs of the corporation, and may authorize the seal of the corporation to be affixed to all papers which may require it.

3.2COMMITTEE RULES

Unless the Board of Directors otherwise provides, each committee designated by the Board of Directors may make, alter and repeal rules for the conduct of its business.

ARTICLE IV

OFFICERS

4.1 EXECUTIVE OFFICERS; ELECTION; QUALIFICATIONS; TERM OF OFFICE; RESIGNATION; REMOVAL; VACANCIES

(a)Unless otherwise determined by the Board of Directors, the officers of the corporation shall consist of a chief executive officer, a president, a chief financial officer, one or more vice presidents, a secretary, one or more assistant secretaries, a treasurer or one or more assistant treasurers as are elected by the Board of Directors and such other officers as the Board of Directors may determine, who will be elected in such manner and hold their offices for such terms as the Board of Directors may prescribe. Each such officer shall hold office until the first meeting of the Board of Directors after the annual meeting of stockholders next succeeding his election, and until his successor is elected and qualified or until his earlier resignation or removal. Any officer may resign at any time upon written notice to the corporation. The Board of Directors may remove any officer with or without cause at any time, but such removal shall be without prejudice to the contractual rights of such officer, if any, with the corporation. Any number of offices may be held by the same person. Any vacancy occurring in any office of the corporation by death, resignation, removal or otherwise may be filled for the unexpired portion of the term by the Board of Directors at any regular or special meeting.

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(b)In addition to officers elected by the Board of Directors, the corporation may have one or more appointed vice presidents. Such appointed vice presidents may be appointed by the Board of Directors, the chairman of the Board of Directors or the chief executive officer and will have such duties as may be established by the Board of Directors, the chairman of the Board of Directors or the chief executive officer.

ARTICLE V

STOCK

5.1CERTIFICATES

Shares of stock of the corporation may be certificated or uncertificated as provided by the Delaware General Corporation Law. Every holder of stock, upon written request, shall be entitled to have a certificate signed by or in the name of the corporation by the Chairman or Vice Chairman of the Board of Directors, if any, or the President or Vice President, and by the Treasurer or an Assistant Treasurer, or the Secretary or an Assistant Secretary, of the corporation, certifying the number of shares owned by him in the corporation. Any of or all the signatures on the certificate may be a facsimile. In case any officer, transfer agent, or registrar who has signed or whose facsimile signature has been placed upon a certificate shall have ceased to be such officer, transfer agent, or registrar before such certificate is issued, it may be issued by the corporation with the same effect as if he were such officer, transfer agent, or registrar at the date of issue.

5.2 LOST, STOLEN OR DESTROYED STOCK CERTIFICATES; ISSUANCE OF NEW CERTIFICATES

The corporation may issue a new certificate of stock in the place of any certificate theretofore issued by it, alleged to have been lost, stolen or destroyed, and the corporation may require the owner of the lost, stolen or destroyed certificate, or his legal representative, to give the corporation a bond sufficient to indemnify it against any claim that may be made against it on account of the alleged loss, theft or destruction of any such certificate or the issuance of such new certificate.

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ARTICLE VI

INDEMNIFICATION

6.1THIRD PARTY ACTIONS

The corporation shall indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending, or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the corporation) by reason of the fact that he is or was a director or officer of the corporation, or that such director or officer is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise (collectively "Agent"), against expenses (including attorneys' fees), judgments, fines and amounts paid in settlement (if such settlement is approved in advance by the Company, which approval shall not be unreasonably withheld) actually and reasonably incurred by him in connection with such action, suit or proceeding if he acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful. The termination of any action, suit or proceeding by judgment, order, settlement, conviction, or upon a plea of nolo contendere or its equivalent, shall not, of itself, create a presumption that the person did not act in good faith and in a manner which he reasonably believed to be in or not opposed to the best interests of the corporation, and, with respect to any criminal action or proceeding, had reasonable cause to believe that his conduct was unlawful.

6.2ACTIONS BY OR IN THE RIGHT OF THE CORPORATION

The corporation shall indemnify any person who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the corporation to procure a judgment in its favor by reason of the fact that he is or was an Agent (as defined in Section 6.1) against expenses (including attorneys' fees) actually and reasonably incurred by him in connection with the defense or settlement of such action or suit if he acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the corporation and except that no indemnification shall be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to the corporation unless and only to the extent that the Delaware Court of Chancery or the court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Delaware Court of Chancery or such other court shall deem proper.

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6.3SUCCESSFUL DEFENSE

To the extent that an Agent of the corporation has been successful on the merits or otherwise in defense of any action, suit or proceeding referred to in Sections 6.1 and 6.2, or in defense of any claim, issue or matter therein, he shall be indemnified against expenses (including attorneys' fees) actually and reasonably incurred by him in connection therewith.

6.4DETERMINATION OF CONDUCT

Any indemnification under Sections 6.1 and 6.2 (unless ordered by a court) shall be made by the corporation only as authorized in the specific case upon a determination that the indemnification of the Agent is proper in the circumstances because he has met the applicable standard of conduct set forth in Sections 6.1 and 6.2. Such determination shall be made (1) by the Board of Directors or an executive committee by a majority vote of a quorum consisting of directors who were not parties to such action, suit or proceeding, or (2) if such quorum is not obtainable or, even if obtainable, a quorum of disinterested directors so directs, by independent legal counsel in a written opinion, or (3) by the stockholders.

6.5PAYMENT OF EXPENSES IN ADVANCE

Expenses incurred in defending a civil or criminal action, suit or proceeding shall be paid by the corporation in advance of the final disposition of such action, suit or proceeding upon receipt of an undertaking by or on behalf of the director, officer, employee or agent to repay such amount if it shall ultimately be determined that he is not entitled to be indemnified by the corporation as authorized in this Article VI.

6.6INDEMNITY NOT EXCLUSIVE

The indemnification and advancement of expenses provided or granted pursuant to the other subsections of this section shall not be deemed exclusive of any other rights to which those seeking indemnification or advancement of expenses may be entitled under any Bylaw, agreement, vote of stockholders or disinterested directors or otherwise, both as to action in his official capacity and as to action in another capacity while holding such office.

6.7INSURANCE INDEMNIFICATION

The corporation shall have the power to purchase and maintain insurance on behalf of any person who is or was an Agent of the corporation, or is or was serving at the request of the corporation, as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise against any liability asserted against him and incurred by him in any such capacity, or arising out of his status as such, whether or not the corporation would have the power to indemnify him against such liability under the provisions of this Article VI.

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6.8THE CORPORATION

For purposes of this Article VI, references to "the corporation" shall include, in addition to the resulting corporation, any constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger which, if its separate existence had continued, would have had power and authority to indemnify its directors and officers, so that any person who is or was a director or Agent of such constituent corporation, or is or was serving at the request of such constituent corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, shall stand in the same position under and subject to the provisions of this Article VI (including, without limitation, the provisions of Section 6.4) with respect to the resulting or surviving corporation as he would have with respect to such constituent corporation if its separate existence had continued.

6.9EMPLOYEE BENEFIT PLANS

For purposes of this Article VI, references to "other enterprises" shall include employee benefit plans; references to "fines" shall include any excise taxes assessed on a person with respect to an employee benefit plan; and references to "serving at the request of the corporation" shall include any service as a director, officer, employee or agent of the corporation which imposes duties on, or involves services by, such director, officer, employee or agent with respect to an employee benefit plan, its participants or beneficiaries; and a person who acted in good faith and in a manner he reasonably believed to be in the interest of the participants and beneficiaries of an employee benefit plan shall be deemed to have acted in a manner "not opposed to the best interests of the corporation" as referred to in this Article VI.

6.10INDEMNITY FUND

Upon resolution passed by the Board of Directors, the corporation may establish a trust or other designated account, grant a security interest or use other means (including, without limitation, a letter of credit), to ensure the payment of certain of its obligations arising under this Article VI and/or agreements which may be entered into between the corporation and its officers and directors from time to time.

6.11INDEMNIFICATION OF OTHER PERSONS

The provisions of this Article VI shall not be deemed to preclude the indemnification of any person who is not an Agent (as defined in Section 6.1), but whom the corporation has the power or obligation to indemnify under the provisions of the Delaware General Corporation Law or otherwise. The corporation may, in its sole discretion, indemnify an employee, trustee or other agent as permitted by the Delaware General Corporation Law. The corporation shall indemnify an employee, trustee or other agent where required by law.

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6.12SAVINGS CLAUSE

If this Article or any portion thereof shall be invalidated on any ground by any court of competent jurisdiction, then the corporation shall nevertheless indemnify each Agent against expenses (including attorneys' fees), judgments, fines and amounts paid in settlement with respect to any action, suit, proceeding or investigation, whether civil, criminal or administrative, and whether internal or external, including a grand jury proceeding and an action or suit brought by or in the right of the corporation, to the full extent permitted by any applicable portion of this Article that shall not have been invalidated, or by any other applicable law.

6.13 CONTINUATION OF INDEMNIFICATION AND ADVANCEMENT OF EXPENSES

The indemnification and advancement of expenses provided by, or granted pursuant to, this Article VI shall, unless otherwise provided when authorized or ratified, continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of the heirs, executors and administrators of such a person.

ARTICLE VII

MISCELLANEOUS

7.1FISCAL YEAR

The fiscal year of the corporation shall be determined by resolution of the Board of Directors.

7.2SEAL

The corporate seal shall have the name of the corporation inscribed thereon and shall be in such form as may be approved from time to time by the Board of Directors.

7.3 WAIVER OF NOTICE OF MEETINGS OF STOCKHOLDERS, DIRECTORS AND COMMITTEES

Any written waiver of notice, signed by the person entitled to notice, whether before or after the time stated therein, shall be deemed equivalent to notice. Attendance of a person at a meeting shall constitute a waiver of notice of such meeting, except when the person attends a meeting for the express purpose of objecting, at the beginning of the meeting, to the transaction of any business because the meeting is not lawfully called or convened. Neither the business to be transacted at, nor the purpose of any regular or special meeting of the stockholders, directors, or members of a committee of directors need be specified in any written waiver of notice. If such a waiver is given by electronic transmission, the electronic transmission must either set forth or be submitted with information from which it can be determined that the electronic transmission was authorized by the stockholder.

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7.4INTERESTED DIRECTORS; QUORUM

No contract or transaction between the corporation and one or more of its directors or officers, or between the corporation and any other corporation, partnership, association or other organization in which one or more of its directors or officers are directors or officers, or have a financial interest, shall be void or voidable solely for this reason, or solely because the director or officer is present at or participates in the meeting of the Board of Directors or committee thereof which authorizes the contract or transaction, or solely because his or their votes are counted for such purpose, if: (1) the material facts as to his relationship or interest and as to the contract or transaction are disclosed or are known to the Board of Directors or the committee, and the Board of Directors or committee in good faith authorizes the contract or transaction by the affirmative votes of a majority of the disinterested directors, even though the disinterested directors be less than a quorum; or (2) the material facts as to his relationship or interest and as to the contract or transaction are disclosed or are known to the stockholders entitled to vote thereon, and the contract or transaction is specifically approved in good faith by vote of the stockholders; or (3) the contract or transaction is fair as to the corporation as of the time it is authorized, approved or ratified, by the Board of Directors, a committee thereof, or the stockholders. Common or interested directors may be counted in determining the presence of a quorum at a meeting of the Board of Directors or of a committee which authorizes the contract or transaction.

7.5FORM OF RECORDS

Any records maintained by the corporation in the regular course of its business, including its stock ledger, books of account, and minute books, may be kept on, or be in the form of, punch cards, magnetic tape, photographs, microphotographs or any other information storage device, provided that the records so kept can be converted into clearly legible form within a reasonable time. The corporation shall so convert any records so kept upon the request of any person entitled to inspect the same.

7.6AMENDMENT OF BYLAWS

These Bylaws may be amended, altered or repealed, and new Bylaws adopted, by (i)  the Board of Directors or (ii) the stockholders upon the affirmative vote of a majority of the voting power of the shares of capital stock entitled to vote thereon.

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ARTICLE VIII

EXCLUSIVE FORUM

8.1 EXCLUSIVE FORUM

Unless the corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall be the sole and exclusive forum, to the fullest extent permitted by law, for (i) any derivative action or proceeding brought on behalf of the corporation, (ii) any action asserting a claim of a breach of a fiduciary duty owed by any director, officer, employee or agent of the corporation to the corporation or the corporation's stockholders, (iii) any action asserting a claim arising pursuant to any provision of the Delaware General Corporation Law, the Certificate of Incorporation or these Bylaws or (iv) any action asserting a claim governed by the internal affairs doctrine.

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EX-10.22

AMENDMENT AGREEMENT TO LOAN AGREEMENT

THIS AMENDMENT AGREEMENT TO LOAN AGREEMENT (this “Amendment Agreement”) is entered into as of November 22, 2013 by and between:

AMKOR TECHNOLOGY KOREA, INC., a corporation (chusik hoesa) organized and existing under the laws of Republic of Korea (“Korea”), with its registered head office at 100, Amkor-ro, Buk-gu, Gwangju, Korea (the “Borrower”); and

THE KOREA DEVELOPMENT BANK, a financial institution duly organized and existing under the laws of Korea with its registered office at 14, Eunhaeng-ro, Youngdeungpo-gu, Seoul 150-973, Korea (the “Lender”)

WITNESSETH

WHEREAS, the Borrower and the Lender (collectively the “Parties”) have entered into certain loan agreement dated as of November 23, 2012 (the “Loan Agreement”) under which the Lender had provided to the Borrower a term loan facility in an aggregate principal amount not exceeding the Commitment (as defined therein) upon the terms and subject to the conditions set out therein for the purpose of purchasing semiconductor processing equipment and other capex including facilities;

WHEREAS, the Borrower has provided a mortgage agreement dated as of July 2, 2012 and as amended on December 13, 2013 (collectively, the “Mortgage Agreement”) for the benefit of the Lender as a continuing security which shall remain in full force and effect until the moneys and liabilities thereby guaranteed have been unconditionally and irrevocably paid and discharged in full to the satisfaction of the Lender; and

WHEREAS, the Parties desire to amend certain provisions in the Loan Agreement as mutually agreed upon between the Parties.

NOW, THEREFORE, the parties hereto agree as follows:

1.    DEFINITIONS

Capitalized terms used herein shall have the same meaning as ascribed to them in the Loan Agreement unless otherwise defined herein.

2.    AMENDMENT

2.1 The following term defined in Section 1.01 of the Loan Agreement shall be replaced with the following in its entirety:

“Availability Period” means the period beginning on the date of this Agreement and ending on the earlier of (x) the date on which the Commitment is fully drawn, cancelled or terminated under the provision of this Agreement and (y) March 31, 2014.

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3.    REPRESENTATIONS AND WARRANTIES

3.1 The Borrower represents and warrants that it has full power and authority and has taken all corporate action necessary to execute and deliver this Amendment Agreement and to perform and observe the terms and conditions hereof and of the Loan Agreement as amended hereby, that no consents or approvals are necessary for the execution, delivery and performance of this Amendment Agreement except for those which have been obtained, and that this Amendment Agreement constitutes the legal, valid and binding obligation of the Borrower enforceable in accordance with its terms.

3.2 The Borrower hereby makes the representations and warranties set out in Article 7 of the Loan Agreement as if they were set out in full here and as if any reference therein to the Loan Agreement included any reference to this Amendment Agreement.

4.    CONTINUANCE OF THE LOAN AGREEMENT AND CROSS REFERENCE

4.1 All terms, conditions and provisions of the Loan Agreement shall remain valid, binding and in full force and effect except where expressly modified by this Amendment Agreement and save as expressly provided herein nothing in this Amendment Agreement shall be construed as a waiver, variation or amendment of the provisions of the Loan Agreement.

4.2 Each reference to the terms “Agreement”, “hereof”, “hereunder” and words of similar import contained in the Loan Agreement shall, upon the date hereof, be deemed to be a reference to the Loan Agreement as amended by this Amendment Agreement and each such reference (and each reference to the term “Loan Agreement” or “Agreement”) in all other documents related thereto (including, without limitation, the Mortgage Agreement) shall be deemed to be a reference to the Loan Agreement as amended hereby. The Loan Agreement as amended by this Amendment Agreement shall, from and after the date hereof, read as a single and integrated document incorporating the amendments effected hereby.

5.    GOVERNING LAW

This Amendment Agreement shall be governed by, and construed in accordance with, the laws of Korea.

6.    COUNTERPARTS

This Amendment Agreement may be executed in counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same instrument.

[SIGNATURE PAGE TO FOLLOW]

- 2 -

IN WITNESS WHEREOF, the parties hereto have caused this Amendment Agreement to be executed by their respective duly authorized signatories as of the day and year first written above.

Borrower:

AMKOR TECHNOLOGY KOREA, INC.

By: /s/ JooHo Kim

Name: JooHo Kim

Title: President and Representative Director (SEAL)

Lender:

THE KOREA DEVELOPMENT BANK

By: /s/ JongBok, Choi

Name: JongBok, Choi

Title: General Manager of Corporate Banking Department (Seal)

- 3 -

EX-10.28

AMENDMENT AGREEMENT TO LOAN AGREEMENT

THIS AMENDMENT AGREEMENT TO LOAN AGREEMENT (this “Amendment Agreement”) is entered into as of Dec 27, 2013 by and between:

AMKOR TECHNOLOGY KOREA, INC., a corporation (chusik hoesa) organized and existing under the laws of Republic of Korea (“Korea”), with its registered head office at 100, Amkor-ro, Buk-gu, Gwangju, Korea (the “Borrower”); and

THE KOREA DEVELOPMENT BANK, a financial institution duly organized and existing under the laws of Korea with its registered office at 14, Eunhaeng-ro, Youngdeungpo-gu, Seoul 150-973, Korea (the “Lender”)

WITNESSETH

WHEREAS, the Borrower and the Lender (collectively the “Parties”) have entered into certain loan agreement dated as of April 29, 2013 (the “Loan Agreement”) under which the Lender had provided to the Borrower a term loan facility in an aggregate principal amount not exceeding the Commitment (as defined therein) upon the terms and subject to the conditions set out therein for the purpose of purchasing semiconductor processing equipment and other capex including facilities;

WHEREAS, the Borrower has provided a mortgage agreement dated as of July 2, 2012 and as amended on December 13, 2012 (collectively, the “Mortgage Agreement”) for the benefit of the Lender as a continuing security which shall remain in full force and effect until the moneys and liabilities thereby guaranteed have been unconditionally and irrevocably paid and discharged in full to the satisfaction of the Lender; and

WHEREAS, the Parties desire to amend certain provisions in the Loan Agreement as mutually agreed upon between the Parties.

NOW, THEREFORE, the parties hereto agree as follows:

1.    DEFINITIONS

Capitalized terms used herein shall have the same meaning as ascribed to them in the Loan Agreement unless otherwise defined herein.

2.    AMENDMENT

2.1 The following term defined in Section 1.01 of the Loan Agreement shall be replaced with the following in its entirety:

“Margin” means the rate equal to three point seven percent (3.70%) per annum.

- 1 -

3.    REPRESENTATIONS AND WARRANTIES

3.1 The Borrower represents and warrants that it has full power and authority and has taken all corporate action necessary to execute and deliver this Amendment Agreement and to perform and observe the terms and conditions hereof and of the Loan Agreement as amended hereby, that no consents or approvals are necessary for the execution, delivery and performance of this Amendment Agreement except for those which have been obtained, and that this Amendment Agreement constitutes the legal, valid and binding obligation of the Borrower enforceable in accordance with its terms.

3.2 The Borrower hereby makes the representations and warranties set out in Article 7 of the Loan Agreement as if they were set out in full here and as if any reference therein to the Loan Agreement included any reference to this Amendment Agreement.

4.    CONTINUANCE OF THE LOAN AGREEMENT AND CROSS REFERENCE

4.1 All terms, conditions and provisions of the Loan Agreement shall remain valid, binding and in full force and effect except where expressly modified by this Amendment Agreement and save as expressly provided herein nothing in this Amendment Agreement shall be construed as a waiver, variation or amendment of the provisions of the Loan Agreement.

4.2 Each reference to the terms “Agreement”, “hereof”, “hereunder” and words of similar import contained in the Loan Agreement shall, upon the date hereof, be deemed to be a reference to the Loan Agreement as amended by this Amendment Agreement and each such reference (and each reference to the term “Loan Agreement” or “Agreement”) in all other documents related thereto (including, without limitation, the Mortgage Agreement) shall be deemed to be a reference to the Loan Agreement as amended hereby. The Loan Agreement as amended by this Amendment Agreement shall, from and after the date hereof, read as a single and integrated document incorporating the amendments effected hereby.

5.    GOVERNING LAW

This Amendment Agreement shall be governed by, and construed in accordance with, the laws of Korea.

6.    COUNTERPARTS

This Amendment Agreement may be executed in counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall constitute but one and the same instrument.

[SIGNATURE PAGE TO FOLLOW]

- 2 -

IN WITNESS WHEREOF, the parties hereto have caused this Amendment Agreement to be executed by their respective duly authorized signatories as of the day and year first written above.

Borrower:

AMKOR TECHNOLOGY KOREA, INC.

By: /s/ JooHo Kim

Name: JooHo Kim

Title: President and Representative Director (SEAL)

Lender:

THE KOREA DEVELOPMENT BANK

By: /s/ JongBok, Choi

Name: JongBok, Choi

Title: General Manager of Corporate Banking Department (Seal)

- 3 -

EX-12.1

Exhibit 12.1

AMKOR TECHNOLOGY, INC.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	Year Ended December 31,
	2013		2012		2011		2010		2009
	(In thousands)
Earnings
Income before taxes and equity in earnings of unconsolidated affiliate	$	123,987	$	54,111	$	93,134	$	244,724	$	124,150
Interest expense	103,027		94,280		82,869		96,340		110,747
Amortization of deferred debt issuance costs and premiums	2,880		3,663		3,737		4,505		4,649
Interest portion of rent (1)	7,947		4,386		5,020		5,450		5,879
	$	237,841	$	156,440	$	184,760	$	351,019	$	245,425
Fixed Charges
Interest expense	$	103,027	$	94,280	$	82,869	$	96,340	$	110,747
Capitalized interest	1,740		—		—		—		—
Amortization of debt issuance costs and premiums	2,880		3,663		3,737		4,505		4,649
Interest portion of rent (1)	7,947		4,386		5,020		5,450		5,879
	$	115,594	$	102,329	$	91,626	$	106,295	$	121,275
Ratio of earnings to fixed charges	2.1		1.5		2.0		3.3		2.0

(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 Iwate Company, Ltd.	Japan
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 28, 2014, 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 28, 2014

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 28, 2014

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 28, 2014

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, 2013 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 28, 2014

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, 2013 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 28, 2014

XML

Inventories (Tables)

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:

	December 31,
	2013		2012
	(In thousands)
Raw materials and purchased components	$	147,292	$	166,691
Work-in-process	53,131		60,748
Total inventories	$	200,423	$	227,439

XML

Share-Based Compensation Plans (Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,971	$ 2,720	$ 5,010
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	2,591	2,368	4,363
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	380	352	647
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	883	1,160	2,025
Restricted shares [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,088	$ 1,560	$ 2,985

XML

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

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)
2014	$	23,380
2015	14,937
2016	4,116
2017	4,060
2018	4,031
Thereafter	6,445
Total	$	56,969

XML

Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventories
Raw materials and purchased components	$ 147,292	$ 166,691
Work-in-process	53,131	60,748
Total inventories	$ 200,423	$ 227,439

XML

Share-Based Compensation Plans (Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares Outstanding beginning balance	4,893
Number of Shares Granted	2,085
Number of Shares Exercised	(96)
Number of Shares Forfeited or expired	(2,009)
Number of Shares Outstanding ending balance	4,873
Number of Shares Fully vested and expected to vest	4,834
Number of Shares Exercisable	2,688
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)	$ 9.52
Weighted Average Exercise Price Per Share Granted (in dollars per share)	$ 4.39
Weighted Average Exercise Price Per Share Exercised (in dollars per share)	$ 4.65
Weighted Average Exercise Price Per Share Forfeited or expired (in dollars per share)	$ 11.69
Weighted Average Exercise Price Per Share Outstanding ending balance (in dollars per share)	$ 6.52
Weighted Average Exercise Price Per Share Fully vested and expected to vest (in dollars per share)	$ 6.54
Weighted Average Exercise Price Per Share Exercisable (in dollars per share)	$ 8.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Exercise Price Per Share average contractual term (years)	5 years 8 months 27 days
Average Remaining Contractual Term Fully vested and expected to vest (years)	5 years 8 months 16 days
Average Remaining Contractual Term Exercisable (years)	2 years 8 months 12 days
Aggregate intrinsic value Outstanding ending balance (in dollars)	$ 4,661
Aggregate intrinsic value Fully vested and expected to vest (in dollars)	4,594
Aggregate intrinsic value Exercisable (in dollars)	$ 926

XML

Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2009	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Equipment Acquired and Leased To Joint Venture			$ 44.7
J Devices [Member]
Schedule of Investments [Line Items]
Ownership Interest	60.00%			60.00%	30.00%	30.00%
Payments to Acquire Equity Method Investments	67.4		16.7
Proceeds from Equipment Purchased by Lessee		8.8
Retained Earnings, Undistributed Earnings from Equity Method Investees				31.8
Ownership Threshold 2014 [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options				66.00%
Ownership Threshold 2015 [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Maximum ownership ratio of call options				80.00%
Second Investment [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Equity Method Investment Unamortized Difference Between Carrying Amount And Underlying Equity				$ (2.9)
Former NMD Shareholders [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Ownership Interest				34.00%
Toshiba [Member] | J Devices [Member]
Schedule of Investments [Line Items]
Ownership Interest				6.00%

XML

Accumulated Other Comprehensive Income and Loss Accumulated Other Comprehensive Income and Loss (Tables)

12 Months Ended

Dec. 31, 2013

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 and loss, net of tax:

	Defined Benefit Pension			Foreign Currency			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2011	$	(10,510	)	$	19,034		$	2,325		$	10,849
Other comprehensive income (loss) before reclassifications	4,731			(2,688		)	(2,057		)	(14		)
Amounts reclassified from accumulated other comprehensive (loss) income	406			—			—			406
Other comprehensive income (loss)	5,137			(2,688		)	(2,057		)	392
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	)

XML

Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Description of Business and Summary of Significant Accounting Policies [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

XML

Investments Summary Income Statement Information (Details) (J Devices [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
J Devices [Member]
Summary Income Statement Information of Equity Method Investee [Line Items]
Net sales	$ 825,135	$ 531,530	$ 576,421
Gross profit	83,778	61,003	82,729
Net income	$ 16,538	$ 20,299	$ 25,412

XML

Property, Plant and Equipment (Narrative) (Details) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2013 ARIZONA	Dec. 31, 2013 KOREA, REPUBLIC OF
Significant Acquisitions and Disposals [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 27,209,000	$ 2,727,000	$ 15,823,000	$ 22,800,000
Closing Costs for Asset Sales				1,200,000
Purchases of property, plant and equipment	566,256,000	533,512,000	466,694,000		100,300,000
Interest Costs Capitalized					$ 1,700,000

XML

Pension and Severance Plans (Defined Benefit Plans) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 80,528,000	$ 78,897,000
Service cost	5,909,000	6,362,000	5,744,000
Interest cost	3,170,000	3,270,000	3,274,000
Benefits paid	(1,602,000)	(1,168,000)
Actuarial gains	(2,513,000)	(3,899,000)
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	13,017,000	0
Effects of curtailment	(176,000)	554,000
Settlement	(8,701,000)	(4,925,000)
Foreign exchange (gain) loss	(8,060,000)	1,437,000
Projected benefit obligation at end of year	81,572,000	80,528,000	78,897,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	58,146,000	48,801,000
Actual gain on plan assets	5,159,000	3,500,000
Employer contributions	1,120,000	8,687,000	3,600,000
Settlement	(8,701,000)	(4,925,000)
Foreign exchange (loss) gain	(3,818,000)	3,251,000
Fair value of plan assets at end of year	50,304,000	58,146,000	48,801,000
Funded status of the Plans at end of year	(31,268,000)	(22,382,000)
Defined Benefit Plan, Assets for Plan Benefits [Abstract]
Accrued benefit liability (included in pension and severance obligations)	(31,300,000)	(22,400,000)
Accumulated benefit obligation	55,900,000	54,600,000
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate projected benefit obligation	73,326,000	80,528,000
Aggregate fair value of plan assets	41,957,000	58,146,000
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Aggregate accumulated benefit obligation	24,877,000	17,816,000
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%	4.20%	5.20%
Discount rate for determining benefit obligations at year end	3.90%	4.00%	4.20%
Rate of compensation increase for determining net periodic pension cost	4.10%	4.50%	4.60%
Rate of compensation increase for determining benefit obligations at year end	4.10%	4.10%	4.50%
Expected rate of return on plan assets for determining net periodic pension cost	6.30%	6.30%	6.40%
Equity Securities [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	20,173,000	9,440,000
Philippine Subsidiaries [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount of employer and related party securities included in plan assets	$ 600,000	$ 400,000
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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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, 2013
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	816
Number of Shares Awards granted	750
Number of Shares Awards vested	(277)
Number of Shares Awards forfeited	(117)
Number of Shares Nonvested ending balance	1,172
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)	$ 5.61
Weighted Average Grant-Date Fair Value Awards granted (in dollars per share)	$ 4.50
Weighted Average Grant-Date Fair Value Awards vested (in dollars per share)	$ 6.19
Weighted Average Grant-Date Fair Value Awards forfeited (in dollars per share)	$ 4.92
Weighted Average Grant-Date Fair Value Nonvested ending balance (in dollars per share)	$ 4.83

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Intangible Assets (Amortization) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
2014	$ 1,028
2015	736
2016	521
2017	488
2018	275
Thereafter	141
Net	$ 3,189	$ 4,766

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Debt (Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]
2014	$ 61,350
2015	85,000
2016	70,000
2017	90,000
2018	345,000
Thereafter	995,000
Total debt	$ 1,646,350	$ 1,545,000

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Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Payroll and benefits	$ 75,909	$ 56,651
Deferred revenue and customer advances	44,764	52,773
Accrued royalties (Note 19)	43,324	33,324
Accrued interest	21,807	19,048
Acquisition payable (Note 3)	17,897	0
Income taxes payable	17,528	8,341
Accrued severance plan obligations (Note 15)	11,197	9,516
Other accrued expenses	31,826	33,311
Total accrued expenses	$ 264,252	$ 212,964

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Pension and Severance Plans (Defined Contribution Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
US Defined Contribution Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum Allowable Percentage Contribution	60.00%
Matching Percentage	75.00%
Cost Recognized	$ 1.8	$ 1.8	$ 1.9
Taiwan Defined Contribution Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum Allowable Percentage Contribution	6.00%
Defined Contribution Plan, Employer Required Contribution, Percent of Employees' Gross Pay	6.00%
Cost Recognized	2.4	2.3	2.3
Malaysia Defined Contribution Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum Allowable Percentage Contribution	11.00%
Defined Contribution Plan, Employer Required Contribution, Percent of Employees' Gross Pay	12.00%
Cost Recognized	$ 1.0

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Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Apr. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 105,214			$ 38,690
J Devices [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 105,214			$ 38,690
Equity Method Investment, Ownership Percentage	60.00%	60.00%	30.00%	30.00%

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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,961,306	$ 4,599,053
Less accumulated depreciation and amortization	(2,954,753)	(2,779,084)
Total property, plant and equipment, net	2,006,553	1,819,969
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	208,048	106,338
Land use rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,845	19,945
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	911,258	904,919
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,577,045	3,332,855
Software and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	193,641	191,132
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,430	19,194
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 27,039	$ 24,670

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Accumulated Other Comprehensive Income and Loss Accumulated Other Comprehensive Income and Loss

12 Months Ended

Dec. 31, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive Income (Loss) Note [Text Block]

16. Accumulated Other Comprehensive Income and Loss

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

	Defined Benefit Pension			Foreign Currency			Equity Interest in J-Devices' Other Comprehensive Income (Loss)			Total
	(In thousands)
Accumulated other comprehensive (loss) income at December 31, 2011	$	(10,510	)	$	19,034		$	2,325		$	10,849
Other comprehensive income (loss) before reclassifications	4,731			(2,688		)	(2,057		)	(14		)
Amounts reclassified from accumulated other comprehensive (loss) income	406			—			—			406
Other comprehensive income (loss)	5,137			(2,688		)	(2,057		)	392
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	)

Amounts reclassified out of accumulated other comprehensive income are included as a component of net periodic pension cost (Note 15).

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Exit Activities and Reductions in Force (Tables)

12 Months Ended

Dec. 31, 2013

Restructuring and Related Activities [Abstract]

Summary of exit activities and reduction in force initiatives

The following table summarizes our exit activities and reduction in force initiatives associated with these efforts. “Charges” represents the initial charge related to the exit activity. “Cash Payments” consists of the utilization of “Charges.” “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	(In thousands)
Accrual at December 31, 2010	$	670
Charges, net	8,326
Cash Payments	(7,416		)
Non-cash Amounts	(1,580		)
Accrual at December 31, 2011	—
Charges, net	11,211
Cash Payments	(8,682		)
Non-cash Amounts	(922		)
Accrual at December 31, 2012	1,607
Charges, net	10,506
Cash Payments	(12,531		)
Non-cash Amounts	418
Accrual at December 31, 2013	$	—

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Investments (Tables)

12 Months Ended

Dec. 31, 2013

Investments, All Other Investments [Abstract]

Investments

Investments consist of the following:

	December 31,
	2013				2012
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	105,214	60.0	%	$	38,690	30.0	%

Summary Financial Information of Unconsolidated Affiliate [Table Text Block]

The following tables present summary financial information of J-Devices:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Summary income statement information for J-Devices
Net sales	$	825,135	$	531,530	$	576,421
Gross profit	83,778		61,003		82,729
Net income	16,538		20,299		25,412

	December 31,
	2013		2012
	(In thousands)
Summary balance sheet information for J-Devices
Current assets	$	352,628	$	240,759
Non-current assets (including property, plant and equipment)	234,241		201,459
Current liabilities (including debt)	298,401		225,531
Total debt	131,275		144,733
Non-current liabilities (including debt)	108,928		96,612
Total stockholders' equity	179,540		120,075

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Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of identifiable intangible assets	$ 3.6	$ 3.9	$ 5.2

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Fair Value Measurements (Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 1,744,028	$ 1,703,120
Carrying Value	1,652,740	1,545,000
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,276,390	1,045,000
Senior Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,321,443	1,061,945
Convertible Subordinated Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	56,350	250,000
Convertible Subordinated Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	102,585	371,975
Subsidiary Term Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	320,000	250,000
Subsidiary Term Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 320,000	$ 269,200

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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013			2012			2011
	(In thousands, except per share data)
Net income attributable to Amkor	$	109,296		$	41,818		$	91,808
Income allocated to participating securities	(681		)	(212		)	(332		)
Net income available to Amkor common stockholders	108,615			41,606			91,476
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	93			212			332
Interest on 6.0% convertible notes due 2014, net of tax	9,440			16,103			16,103
Net income attributable to Amkor — diluted	$	118,148		$	57,921		$	107,911
Weighted average shares outstanding — basic	187,032			160,105			190,829
Effect of dilutive securities:
Stock options and restricted share awards	21			241			199
6.0% convertible notes due 2014	48,277			82,658			82,658
Weighted average shares outstanding — diluted	235,330			243,004			273,686
Net income attributable to Amkor per common share:
Basic	$	0.58		$	0.26		$	0.48
Diluted	0.50			0.24			0.39

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,
	2013	2012	2011
	(In thousands)
Stock options and restricted share awards	4,890	4,416	5,070
2.5% convertible notes due 2011	—	—	1,094
6.25% convertible notes due 2013	—	—	695
Total potentially dilutive shares	4,890	4,416	6,859

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Description of Business and Summary of Significant Accounting Policies (Other) (Details)	12 Months Ended
	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Land use rights [Member] Minimum [Member]	Dec. 31, 2013 Land use rights [Member] Maximum [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Minimum [Member]	Dec. 31, 2013 Building and Building Improvements [Member] Maximum [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Minimum [Member]	Dec. 31, 2013 Machinery and Equipment [Member] Maximum [Member]	Dec. 31, 2013 Software and Computer Equipment [Member] Minimum [Member]	Dec. 31, 2013 Software and Computer Equipment [Member] Maximum [Member]	Dec. 31, 2013 Furniture and Fixtures [Member] Minimum [Member]	Dec. 31, 2013 Furniture and Fixtures [Member] Maximum [Member]	Dec. 31, 2013 J Devices [Member]	Apr. 30, 2013 J Devices [Member]	Mar. 31, 2013 J Devices [Member]	Dec. 31, 2012 J Devices [Member]
Summary of Significant Accounting Policies [Line Items]
Useful Life, Average			50 years	90 years	10 years	25 years	2 years	7 years	3 years	5 years	4 years	10 years
Finite-Lived Intangible Asset, Useful Life	3 years	10 years
Ownership Interest													60.00%	60.00%	30.00%	30.00%

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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dilutive Securities Adjustments [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,890	4,416	6,859
Net income attributable to Amkor	$ 109,296	$ 41,818	$ 91,808
Undistributed Earnings Allocated to Participating Securities	681	212	332
Net income available to Amkor common stockholders	108,615	41,606	91,476
Adjustment for dilutive securities on net income:
Reallocation of Net Income to Participating Securities	93	212	332
Net income attributable to Amkor — diluted	118,148	57,921	107,911
Weighted average shares outstanding — basic (in shares)	187,032	160,105	190,829
Effect of dilutive securities:
Weighted average shares outstanding — diluted (in shares)	235,330	243,004	273,686
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.58	$ 0.26	$ 0.48
Diluted (in dollars per share)	$ 0.50	$ 0.24	$ 0.39
Convertible Notes Due 2011 [Member]
Net income attributable to Amkor per common share:
Interest rate of convertible subordinated notes	2.50%
Convertible Notes Due 2013 [Member]
Net income attributable to Amkor per common share:
Interest rate of convertible subordinated notes	6.25%
Convertible Notes Due 2014 [Member]
Adjustment for dilutive securities on net income:
Interest on convertible notes due, net of tax	$ 9,440	$ 16,103	$ 16,103
Effect of dilutive securities:
Effect of dilutive securities (in shares)	48,277	82,658	82,658
Net income attributable to Amkor per common share:
Interest rate of convertible subordinated notes	6.00%
Stock Options and Restricted Share Awards [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	21	241	199
Convertible Notes Due 2013 [Member]
Dilutive Securities Adjustments [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	695
Stock Options And Restricted Shares [Member]
Dilutive Securities Adjustments [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,890	4,416	5,070
Convertible Notes Due 2011 [Member]
Dilutive Securities Adjustments [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	1,094

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Income Taxes (Reconciliation of effective tax rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation between statutory rate and income tax provision
U.S. federal tax at 35%	$ 43,396	$ 18,939	$ 32,559
State taxes, net of federal benefit	1,124	1,126	1,451
Foreign income taxed at different rates	(17,814)	(14,717)	(22,507)
Foreign exchange gain (loss)	844	12,329	(5,966)
Change in valuation allowance	(32,415)	(3,112)	(8,672)
Adjustments related to prior years	2,727	(2,464)	3,582
Income tax credits generated	(2,622)	(1,370)	(466)
Repatriation of foreign earnings and profits	6,499	3,240	3,388
Expiration of capital loss carryforward	15,555	0	0
Equity in earnings of J-Devices	0	2,404	3,047
Acquisition expenses	1,381	0	0
Debt conversion costs	4,067	0	0
Other	(96)	626	708
Income tax expense	$ 22,646	$ 17,001	$ 7,124
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets

Our fair value measurements consist of the following:

	December 31,
	2013		2012
	(In thousands)
Recurring fair value measurements:
Cash equivalent money market funds (Level 1)	$	300,352	$	151,066
Restricted cash money market funds (Level 1)	2,681		2,680
Nonrecurring fair value measurements:
Long-lived assets held for use or disposal (Level 3)	$	1,055	$	868

	Year Ended December 31,
	2013		2012		2011
	(In thousands)
Nonrecurring fair value measurements:
Losses on long-lived assets held for use or disposal (Level 3)	$	1,529	$	763	$	3,336

Financial instruments that are not recorded at fair value

The following table presents the fair value and carrying value of financial instruments that are not recorded at fair value on a recurring basis:

	December 31, 2013				December 31, 2012
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,321,443	$	1,276,390	$	1,061,945	$	1,045,000
Convertible senior subordinated notes (Level 1)	102,585		56,350		371,975		250,000
Term loans (Level 2)	320,000		320,000		269,200		250,000
Total debt	$	1,744,028	$	1,652,740	$	1,703,120	$	1,545,000

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Related Party [Member] Convertible Senior Subordinated Notes Due April 2014 [Member]
Non cash investing and financing activities:
Interest rate of convertible subordinated notes	6.00%
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	$ 0

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Income Taxes (Components of deferred tax assets and liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Deferred Tax Assets and Liabilities [Abstract]
Net operating loss carryforwards	$ 147,905,000	$ 155,270,000
Capital loss carryforwards	0	18,221,000
Income tax credits	27,751,000	31,665,000
Property, plant and equipment	14,390,000	283,000
Accrued liabilities	57,374,000	46,045,000
Unrealized foreign exchange loss	3,893,000	3,949,000
Other	15,137,000	19,252,000
Total deferred tax assets	266,450,000	274,685,000
Valuation allowance	(179,183,000)	(209,757,000)
Total deferred tax assets net of valuation allowance	87,267,000	64,928,000
Property, plant and equipment	21,716,000	3,263,000
Deferred gain	6,295,000	6,899,000
Other	1,967,000	13,031,000
Total deferred tax liabilities	29,978,000	23,193,000
Net deferred tax assets	57,289,000	41,735,000
Other current assets	10,729,000	12,615,000
Other assets	47,609,000	40,047,000
Accrued expenses	(97,000)	(800,000)
Other non-current liabilities	(952,000)	(10,127,000)
Valuation Allowance, Deferred Tax Asset, Change in Amount	30,600,000	4,500,000	9,300,000
Valuation Allowance Share Based Compensation [Member]
Components of Deferred Tax Assets and Liabilities [Abstract]
Valuation allowance	$ (6,600,000)

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Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Summarized Accrued expenses

Accrued expenses consist of the following:

	December 31,
	2013		2012
	(In thousands)
Payroll and benefits	$	75,909	$	56,651
Deferred revenue and customer advances	44,764		52,773
Accrued royalties (Note 19)	43,324		33,324
Accrued interest	21,807		19,048
Acquisition payable (Note 3)	17,897		—
Income taxes payable	17,528		8,341
Accrued severance plan obligations (Note 15)	11,197		9,516
Other accrued expenses	31,826		33,311
Total accrued expenses	$	264,252	$	212,964

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Business Segments

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Business Segments, Customer Concentrations and Geographic Information

20. Business Segments, Customer Concentrations and Geographic Information

Beginning with the three months ended December 31, 2013, we have operated as a single operating segment as managed by our Chief Executive Officer, who is considered our chief operating decision maker ("CODM"). The change in operating segments was made in connection with the appointment of our new Chief Executive Officer and other functional organization changes, including the consolidation of our test services business unit with the associated packaging services business units. 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,
	2013		2012		2011
	(In thousands)
Advanced products	$	1,451,664	$	1,302,145	$	1,124,701
Mainstream products	1,504,786		1,457,401		1,651,658
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

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

	Net Sales for the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Japan	$	394,834	$	349,360	$	340,302
Singapore	496,601		452,737		539,467
Thailand	116,376		139,134		111,748
Other foreign countries	743,425		675,365		697,229
Total foreign countries	1,751,236		1,616,596		1,688,746
United States	1,205,214		1,142,950		1,087,613
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

One customer accounted for 23.7%, 21.3% and 16.5% of consolidated net sales in 2013, 2012 and 2011, respectively. Another customer accounted for 10.5% of consolidated net sales in 2013, and another customer accounted for 11.3% of consolidated net sales in 2011.

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,
	2013		2012
	(In thousands)
China	$	524,967	$	409,822
Japan	10,799		17,545
Korea	916,777		907,844
Malaysia	61,080		—
Philippines	240,187		211,323
Taiwan	236,178		233,114
Other foreign countries	93		77
Total foreign countries	1,990,081		1,779,725
United States	16,472		40,244
Total property, plant and equipment, net	$	2,006,553	$	1,819,969

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

19. Commitments and Contingencies

We have a letter of credit sub-facility of $25.0 million under our $150.0 million senior secured revolving credit facility that matures in June 2017. As of December 31, 2013, we had $0.3 million of standby letters of credit outstanding and had an additional $24.7 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. Except as indicated below, 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 involve disputes about whether or not Amkor owes Tessera royalties under the License Agreement with respect to certain packages and the termination of the License Agreement. The main proceeding that is pending is with the International Court of Arbitration of the International Chamber of Commerce (the “ICC”) captioned Amkor Technology, Inc. v. Tessera, Inc. (the “2009 Arbitration”), which we initiated in August 2009. In that proceeding, the ICC arbitration panel issued partial awards and interim orders finding that royalties are due to Tessera with respect to certain asserted patents and packages and that the License Agreement was terminated by Tessera as of February 17, 2011. The arbitration panel reserved for later decision the issues of the amount of royalties and pre-judgment interest due, and the allocation of costs. The other pending arbitration proceedings with Tessera include a request for arbitration by Tessera filed in May 2011 seeking undisclosed damages and a declaration that the License Agreement had been terminated, and a proceeding initiated in July 2012 with respect to claims related to three additional U.S. patents.

In July 2012, Tessera filed a complaint in the U.S. District Court for the District of Delaware. The complaint seeks injunctive relief and damages with respect to Amkor's alleged infringement of one of the U.S. patents (U.S. Patent No. 6,046,076, the "'076 patent") that the arbitration panel found to be royalty bearing in the 2009 Arbitration. In November 2013, the parties agreed to stay the Delaware litigation pending certain determinations in the 2009 Arbitration.

In February 2013, Tessera publicly announced its intention to seek an amount in excess of $150 million in the 2009 Arbitration. That same month, we filed a petition in the Superior Court for San Francisco County (the "California Action") to vacate or correct a portion of the arbitration panel’s interim order relating to the panel’s authority to award royalties for the period after the termination of the License Agreement. The Superior Court has denied our request and we have appealed that decision to the California First District Court of Appeal.

In April 2013, we initiated an inter partes review (the “IPR”) proceeding with the Patent Trial and Appeal Board at the United States Patent and Trademark Office (“U.S. PTO”), requesting it to find certain claims of the ‘076 patent unpatentable, including the claim we were found to infringe during the arbitration. In October 2013, the U.S. PTO determined that there is a reasonable likelihood that we will prevail in challenging that claim and certain others.

In November 2013, Tessera filed a motion to terminate the IPR proceeding on procedural grounds. In January 2014, the U.S. PTO denied Tessera’s motion and the proceeding is scheduled to go forward on the merits with a hearing in May 2014.

In October 2013 and January 2014, the arbitration panel issued additional interim orders which included, among other things, some substantive findings concerning the calculation of royalties under the License Agreement. In February 2014, Tessera filed a motion with the arbitration panel to enjoin us from proceeding with the IPR. We have filed a response with the arbitration panel requesting it to deny Tessera's motion and to stay a portion of the 2009 Arbitration pending final resolution of the IPR proceeding.

As a result of the latest interim order, we estimate the possible range of royalties due to Tessera in the 2009 Arbitration to be from $60 million to $135 million (excluding interest). Because we believe that no amount in the range constitutes a better estimate than any other amount within that range, we have recorded an aggregate charge to cost of goods sold of $60 million ($10.0 million in 2013 and $50.0 million in 2012), representing our estimate of the low end of the range of possible royalties owed to Tessera in respect of the 2009 Arbitration. Of the $60 million of charges we have recognized for royalties, we paid $16.7 million to Tessera in August 2012, plus related interest. As of December 31, 2013, our accrual for royalties for the 2009 Arbitration was $43.3 million, and our estimate of the possible range of royalties due to Tessera in respect of the 2009 Arbitration (net of the royalties paid in August 2012) is from $43.3 million to $118.3 million.

The ultimate amount of damages and interest we may owe to Tessera in connection with the several pending proceedings could be more or less than our estimate of the possible range of royalties due in the 2009 Arbitration. The final outcome of our litigation with Tessera depends upon a number of complex factors, including the panel's determination of which package families the patents apply to, whether those packages meet criteria previously laid out by the panel, overlaps among the packages, the final date through which royalties are applicable, whether we receive a favorable ruling in the California Action or IPR proceeding and other factors. We may adjust our accrual as information develops or upon the issuance of new rulings. We expect to record our estimate of interest accruing with the passage of time.

We strongly dispute Tessera's claims in these proceedings and intend to vigorously defend against them. However, the final outcome of these matters is uncertain, and an adverse result could have a material adverse effect on our results of operations, financial condition and cash flows.

Amkor Technology, Inc. v. Carsem (M) Sdn Bhd, Carsem Semiconductor Sdn Bhd, and Carsem Inc.

Since November 2003, we have been involved in several proceedings against Carsem (M) Sdn Bhd, Carsem Semiconductor Sdn Bhd, and Carsem Inc. (collectively “Carsem”) in which we allege that with its Carsem Dual and Quad Flat No-Lead Packages, Carsem has infringed on one or more of our MicroLeadFrame packaging technology patent claims. We initiated the action with the U.S International Trade Commission (the “ITC”) in Washington, D.C. seeking, under Section 337 of the Tariff Act of 1930, an exclusion order barring the importation by Carsem of infringing products. We also filed a complaint against Carsem in the U.S. District Court for the Northern District of California, alleging patent infringement and seeking an injunction, damages and costs. This District Court action has been stayed pending resolution of the ITC case.

The ITC determined that certain Carsem Dual and Quad Flat No-Lead Packages infringe some patent claims of Amkor's U.S. Patent No. 6,433,277 (the "277 Patent") but that these infringed claims are invalid and, as a result, there is no violation of the Tariff Act. We appealed the ITC's ruling of invalidity for the claims of the 277 Patent to the U.S. Court of Appeals for the Federal Circuit (the "Federal Circuit").

In 2012, the Federal Circuit reversed the ITC's determination of invalidity on the 277 Patent, denied Carsem's petition for a rehearing and remanded the matter to the ITC for further proceedings consistent with its ruling.

In January 2013, in response to Carsem, Inc.’s requests for reexamination of the 277 Patent, the U.S. PTO issued an Office Action rejecting all of the 277 Patent claims as invalid. Amkor believes that all of the 277 Patent claims are valid and filed a response to the Office Action in March 2013 contesting this finding. In January 2014, the U.S. PTO issued an Office Action maintaining the rejection of all claims of the 277 Patent as invalid. Amkor continues to believe its claims are valid and will respond to the Office Action accordingly.

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)
2014	$	23,380
2015	14,937
2016	4,116
2017	4,060
2018	4,031
Thereafter	6,445
Total	$	56,969

Rent expense amounted to $23.8 million, $13.2 million and $15.1 million for 2013, 2012 and 2011, 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 2014 through 2025 are $24.0 million.

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Business Segments (Business Segments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	$ 2,006,553	$ 1,819,969
Net sales	2,956,450	2,759,546	2,776,359
Gross profit	544,513	423,810	490,569
Property, plant and equipment, gross	4,961,306	4,599,053
CHINA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	524,967	409,822
JAPAN
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	10,799	17,545
Net sales	394,834	349,360	340,302
SINGAPORE
Segment Reporting Information [Line Items]
Net sales	496,601	452,737	539,467
THAILAND
Segment Reporting Information [Line Items]
Net sales	116,376	139,134	111,748
Other Foreign Countries [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	93	77
Net sales	743,425	675,365	697,229
Total Foreign Countries [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	1,990,081	1,779,725
Net sales	1,751,236	1,616,596	1,688,746
UNITED STATES
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	16,472	40,244
Net sales	1,205,214	1,142,950	1,087,613
KOREA, REPUBLIC OF
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	916,777	907,844
MALAYSIA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	61,080	0
PHILIPPINES
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	240,187	211,323
TAIWAN, PROVINCE OF CHINA
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	236,178	233,114
Customer One [Member] | Sales [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	23.70%	21.30%	16.50%
Customer Two [Member] | Sales [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.50%
Customer Three [Member] | Sales [Member] | Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage			11.30%
Advanced Products [Member]
Segment Reporting Information [Line Items]
Net sales	1,451,664	1,302,145	1,124,701
Mainstream Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 1,504,786	$ 1,457,401	$ 1,651,658

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Share-Based Compensation Plans (Weighted Average Fair Value) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected life (in years)	6 years 2 months 12 days	6 years	6 years 2 months 12 days
Risk-free interest rate	1.70%	1.00%	2.40%
Volatility	60.00%	65.00%	67.00%
Dividend yield	0.00%	0.00%	0.00%
Weighted average grant date fair value per option granted (in dollars per share)	$ 2.49	$ 2.68	$ 4.06

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Debt (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013			2012
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017	$	—		$	—
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 (1)	525,000			300,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes (2)	56,350			250,000
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, foreign currency funding-linked base rate plus 2.30%, due March 2015 (4)	80,000			100,000
Term loan, LIBOR plus 3.70%, due June 2016 (5)	70,000			—
Term loan, LIBOR plus 3.90% or 3.94%, due July 2017 (6)	90,000			137,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	10,000			—
Term loan, LIBOR plus 3.70%, due December 2019 (8)	70,000			13,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (9)	—			—
	1,646,350			1,545,000
Add: Unamortized premium (1)	6,390			—
Less: Short-term borrowings and current portion of long-term debt	(61,350		)	—
Long-term debt (including related party)	$	1,591,390		$	1,545,000

(1) In September 2012, we issued $300.0 million of 6.375% Senior Notes due October 2022 (the “2022 Notes”). The 2022 Notes were issued at par and are senior unsecured obligations. Interest is payable semi-annually on April 1 and October 1 of each year, and commenced April 1, 2013. In May 2013, we issued an additional $225.0 million of 6.375% Senior Notes due October 2022 (the “Additional 2022 Notes”) under the same terms as the 2022 Notes. The Additional 2022 Notes were issued at a premium of 103% or $6.8 million. The net proceeds from the issuance of the Additional 2022 Notes were designated for general corporate purposes. We incurred $3.4 million of debt issuance costs associated with the Additional 2022 Notes.

(2) In April 2009, we issued $250 million of our 6.0% Convertible Senior Subordinated Notes due April 2014 (the “2014 Notes”). The 2014 Notes are 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. The 2014 Notes are subordinated to the prior payment in full of all of our senior debt. The 2014 Notes were purchased by certain qualified institutional buyers and an entity controlled by Mr. James J. Kim, our Executive Chairman of the Board of Directors. Mr. Kim's affiliate purchased $150.0 million of the 2014 Notes. In June 2013, we completed a tender offer for the 2014 Notes and exchanged $193.7 million of the 2014 Notes, including the $150.0 million held by Mr. Kim's affiliate, for an aggregate 64.0 million shares of our common stock and a cash payment of $11.6 million. The cash payment was equivalent to the remaining coupons for the tendered notes and was recorded as a charge in our Consolidated Statements of Income for the year ended December 31, 2013.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. Principal is payable upon maturity and interest is paid monthly. 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. As of December 31, 2013, $41.0 million was available to be borrowed for general working capital purposes.

(4) In March 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2015. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity, however an early repayment of $20.0 million was made in November 2013.

(5) In April 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In December 2013, the loan agreement was amended which adjusted the base interest rate from 3.80% to 3.70%. As of December 31, 2013, $80.0 million was available to be borrowed for general working capital purposes and the repayment of inter-company debt.

(6) In June 2012, we entered into a $150.0 million secured term loan for five years with a Korean bank which is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. The $150.0 million consists of two components, $50.0 million of the proceeds ("Tranche A") which was used to fully repay our term loan due July 2014 and $100.0 million ("Tranche B") to fund capital expenditures. The term loan was fully drawn in January 2013. Principal is payable upon maturity; however, an early repayment of $60.0 million was made in December 2013.

(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. As of December 31, 2013, $140.0 million was available to be borrowed for capital expenditures.

(8) In November 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2014. In November 2013, the loan agreement was amended which extended the borrowing period from November 2013 to March 2014. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable upon maturity. As of December 31, 2013, $30.0 million was available to be borrowed for capital expenditures.

(9) 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, 2013, $29.0 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,
	2013		2012
Amkor Technology, Inc.
Amkor Technology Korea, Inc.:
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	4.29	%	4.21	%
Term loan, LIBOR plus 3.70%, due June 2016	3.95	%	—
Term loan, LIBOR plus 3.90%, due July 2017 (Tranche A)	4.14	%	4.26	%
Term loan, LIBOR plus 3.94%, due July 2017 (Tranche B)	4.18	%	4.26	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.76	%	—
Term loan, LIBOR plus 3.70%, due December 2019	3.95	%	4.01	%

Schedule of Maturities of Long-term Debt

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2014	$	61,350
2015	85,000
2016	70,000
2017	90,000
2018	345,000
Thereafter	995,000
Total debt	$	1,646,350

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Exit Activities and Reductions in Force

12 Months Ended

Dec. 31, 2013

Restructuring and Related Activities [Abstract]

Restructuring and Reduction in Force

21. 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 our exit activities and reduction in force initiatives associated with these efforts. “Charges” represents the initial charge related to the exit activity. “Cash Payments” consists of the utilization of “Charges.” “Non-cash Amounts” consists of pension plan curtailments and settlements and foreign currency adjustments.

	Employee Separation Costs
	(In thousands)
Accrual at December 31, 2010	$	670
Charges, net	8,326
Cash Payments	(7,416		)
Non-cash Amounts	(1,580		)
Accrual at December 31, 2011	—
Charges, net	11,211
Cash Payments	(8,682		)
Non-cash Amounts	(922		)
Accrual at December 31, 2012	1,607
Charges, net	10,506
Cash Payments	(12,531		)
Non-cash Amounts	418
Accrual at December 31, 2013	$	—

Reductions in Force

During 2013, we reduced our workforce through workforce reduction programs. We recorded $10.5 million in net charges, of which $9.2 million and $1.3 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts were paid as of December 31, 2013.

During 2012, we reduced our workforce through workforce reduction programs. We recorded $11.2 million in net charges including $1.0 million in net curtailment and settlement charges, of which $7.3 million and $3.9 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts accrued at December 31, 2012 were classified in current liabilities.

During 2011, we reduced our workforce through a workforce reduction program. As a result, we recorded $8.3 million in net charges including $1.6 million in net curtailment and settlement charges, of which $7.7 million and $0.6 million were charged to cost of sales and selling, general and administrative expenses, respectively. All amounts were paid as of December 31, 2011.

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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2013

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, 2011	$	223,612	(509	)	(8,163	)	(671	)	$	214,269
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

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

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ 111,657	$ 42,702	$ 93,095
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	410,346	370,479	335,644
Amortization of deferred debt issuance costs and premiums	2,880	3,663	3,737
Deferred income taxes	(8,256)	6,078	(2,239)
Equity in earnings of unconsolidated affiliate	(10,316)	(5,592)	(7,085)
Loss on debt retirement, net	11,619	737	10,557
(Gain) loss on disposal of fixed assets, net	(2,545)	(1,676)	1,942
Share-based compensation	2,971	2,720	5,010
Other, net	(712)	(1,279)	(189)
Changes in assets and liabilities:
Accounts receivable	(992)	(96,107)	95,882
Other receivables	461	(1,570)	2,813
Inventories	38,248	(29,882)	(6,912)
Other current assets	(10,873)	5,015	5,597
Other assets	3,709	598	(347)
Trade accounts payable	(67,198)	17,142	(7,539)
Accrued expenses	32,001	66,566	(21,676)
Other non-current liabilities	30,208	20,695	19,042
Net cash provided by operating activities	557,536	389,063	516,832
Cash flows from investing activities:
Purchases of property, plant and equipment	(566,256)	(533,512)	(466,694)
Payments to acquire businesses, net of cash acquired	(41,865)	0	0
Proceeds from the sale of property, plant and equipment	27,209	2,727	15,823
Payments from J-Devices	8,843	15,484	10,794
Payments to Acquire Businesses and Interest in Affiliates	(67,372)	0	0
Change in restricted cash	74	1,693	13,046
Other investing activities	(1,127)	(6,513)	(3,503)
Net cash used in investing activities	(640,494)	(520,121)	(430,534)
Cash flows from financing activities:
Borrowings under revolving credit facilities	5,000	0	0
Payments under revolving credit facilities	5,000	0	0
Borrowings under short-term debt	0	30,000	26,567
Payments of short-term debt	0	(50,000)	(21,567)
Proceeds from issuance of long-term debt	375,000	637,528	387,512
Proceeds from issuance of long-term debt, related party	0	0	75,000
Payments of long-term debt, net of certain redemption premiums	(80,000)	(420,116)	(392,191)
Payments for debt issuance costs	(3,216)	(6,007)	(5,875)
Payments for the retirement of debt	(11,619)	0	0
Payments for repurchase of common stock	0	(80,946)	(128,368)
Proceeds from issuance of stock through share-based compensation plans	446	182	821
Payments of tax withholding for restricted shares	(466)	(609)	(776)
Net cash provided by (used in) financing activities	280,145	110,032	(58,877)
Effect of exchange rate fluctuations on cash and cash equivalents	207	(557)	2,212
Net increase (decrease) in cash and cash equivalents	197,394	(21,583)	29,633
Cash and cash equivalents, beginning of period	413,048	434,631
Cash and cash equivalents, end of period	610,442	413,048	434,631
Cash paid during the period for:
Interest	100,577	86,138	81,280
Income taxes	18,318	8,199	16,380
Non-cash investing activities:
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	193,650	0	0
Common stock issuance for conversion of related party 6.25% convertible subordinated notes	$ 0	$ 0	$ 100,000

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Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

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 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, Taiwan and the United States (“U.S.”).

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). 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. Actual results could differ materially from those estimates and assumptions.

Reclassifications [Text Block]

Beginning with the year ended December 31, 2013, we reclassified equity in earnings of unconsolidated affiliate from other expense (income) to below income tax expense in our Consolidated Statements of Income for all periods presented. The income tax note (Note 6) was revised accordingly. The revision had no impact on net income.

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, 2013, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.9 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, 2013, 2012 or 2011. 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 in China, Korea, Malaysia, the Philippines, Singapore and Taiwan, 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 subsidiaries in Japan. The asset and liability amounts of these subsidiaries 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 asset and liability 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 exchange gains or losses are included in other expense (income) in the period in which they occur.

Concentration Risk Disclosure [Text Block]

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. 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, 2013, 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

Our future results of operations involve a number of risks and uncertainties. Factors that could affect our business or future results and cause actual results to vary materially from historical results include, but are not limited to, dependence on the highly cyclical semiconductor industry, fluctuations in operating results and cash flows, absence of significant backlog in our business, high fixed costs, failure to meet guidance, declining average selling prices, decisions by our integrated device manufacturer customers to curtail outsourcing, our substantial indebtedness, our ability to fund liquidity needs, restrictive covenants contained in the agreements governing our indebtedness, significant severance plan obligations, failure to maintain an effective system of internal controls, product return and liability risks including warranty claims, dependence on international operations and sales, continuing development and implementation of changes to our management information systems, attracting and retaining qualified employees, difficulties consolidating and integrating our operations, dependence on materials and equipment suppliers, customer concentration and loss of customers, the need for significant capital expenditures, impairment charges, litigation incident to our business, adverse tax consequences, the development of new proprietary technology and the enforcement of intellectual property rights by or against us, complexity of packaging and test processes, competition, our need to comply with existing and future environmental, health and safety laws and initiatives, natural disasters and other calamities and continued control by existing stockholders.

We believe that our cash flows from operating activities together with existing cash and cash equivalents will be sufficient to fund our working capital, capital expenditure and debt service requirements for at least the next twelve months. Thereafter, our liquidity will continue to be affected by, among other things, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels and our ability to either repay debt out of operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings.

We are subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 19. 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.

Intangibles

Finite-lived intangible assets include customer relationship and supply agreements as well as patents and technology rights and are amortized on a straight-line basis over their estimated useful lives, generally for periods ranging from 3 to 10 years. We continually evaluate the reasonableness of the useful lives of these assets. Finite-lived intangibles are tested for recoverability whenever events or changes in circumstances indicate the carrying amounts may not be recoverable. An impairment loss, if any, would be measured as the excess of the carrying value over the fair value determined by discounted future cash flows.

Investments

We have a 60% ownership interest in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan. See Note 12 for additional information. Our investment 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 uncertain income tax positions, deferred revenue, employee-related liabilities, deposits and deferred tax liabilities.

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. See Note 4 and Note 17 for more information

Fair Value Measurements

We apply fair value accounting for all financial 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 18 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services 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.

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, 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 6 for more information regarding unrecognized income tax benefits.

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Debt (Long-Term Debt Parenthetical) (Details) (USD $)					12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended							12 Months Ended			12 Months Ended
	Dec. 31, 2013 Senior Notes Due May 2018 [Member]	Dec. 31, 2013 Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Term Loan Due March 2015 [Member]	Mar. 31, 2012 Korea Subsidiaries [Member] Term Loan Due March 2015 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Term Loan Due June 2016 [Member]	Apr. 30, 2013 Korea Subsidiaries [Member] Term Loan Due June 2016 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Term Loan Due July 2017 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Term Loan Due September 2017 [Member]	Mar. 31, 2013 Korea Subsidiaries [Member] Term Loan Due September 2017 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Term Loan Due December 2019 [Member]	Nov. 30, 2012 Korea Subsidiaries [Member] Term Loan Due December 2019 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Minimum [Member] Term Loan Due July 2017 [Member]	Dec. 31, 2013 Korea Subsidiaries [Member] Maximum [Member] Term Loan Due July 2017 [Member]	Dec. 31, 2013 Related Party [Member] Senior Notes Due 2021 [Member]	Dec. 31, 2013 Related Party [Member] Convertible Senior Subordinated Notes Due April 2014 [Member]	Apr. 30, 2009 Related Party [Member] Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member] Minimum [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member] Maximum [Member]	Dec. 31, 2013 Revolving credit facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]
Debt Instrument [Line Items]
Description of variable rate basis					foreign currency funding-linked rate plus 2.30%		LIBOR plus 3.70%		LIBOR plus 3.90% or 3.94%	foreign currency funding-linked base rate plus 1.75%		LIBOR plus 3.70%							LIBOR plus 1.5%-2.25%			foreign currency funding-linked base rate plus 2.00%	TAIFX plus a bank-determined spread
Credit facility, borrowing capacity						$ 100,000,000		$ 150,000,000.0			$ 150,000,000.0		$ 100,000,000.0						$ 150,000,000.0			$ 41,000,000.0	$ 44,000,000
Interest rate	7.375%	6.375%	6.00%	6.00%	2.30%		3.70%	3.80%		1.75%		3.70%		3.90%	3.94%	6.625%	6.00%			1.50%	2.25%	2.00%
Face amount, related party																$ 75,000,000		$ 150,000,000

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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Summary of Property, plant and equipment

Property, plant and equipment consist of the following:

	December 31,
	2013			2012
	(In thousands)
Land	$	208,048		$	106,338
Land use rights	26,845			19,945
Buildings and improvements	911,258			904,919
Machinery and equipment	3,577,045			3,332,855
Software and computer equipment	193,641			191,132
Furniture, fixtures and other equipment	17,430			19,194
Construction in progress	27,039			24,670
	4,961,306			4,599,053
Less accumulated depreciation and amortization	(2,954,753		)	(2,779,084		)
Total property, plant and equipment, net	$	2,006,553		$	1,819,969

Schedule of depreciation expense

The following table presents depreciation expense as included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Cost of sales	$	377,022	$	336,542	$	302,011
Selling, general and administrative	15,331		19,487		22,387
Research and development	14,360		10,600		5,981
Total depreciation expense	$	406,713	$	366,629	$	330,379

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Business Acquisitions (Details)			12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 Toshiba Electronics Malaysia [Member] USD ($)	Dec. 31, 2013 Toshiba Electronics Malaysia [Member] JPY (¥)	Jul. 31, 2013 Toshiba Electronics Malaysia [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Business Combination, Consideration Transferred			$ 60,000,000	¥ 6,000,000,000
Payments to Acquire Businesses, Gross			42,000,000	4,100,000,000
Business Combination, Remaining Cash to Be Paid	17,897,000	0	18,000,000	1,900,000,000
Cap on Future Royalty Payments				¥ 1,500,000,000

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Property, Plant and Equipment Schedule of Depreciation Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of depreciation expense [Line Items]
Total depreciation expense	$ 406,713	$ 366,629	$ 330,379
Cost of Sales [Member]
Schedule of depreciation expense [Line Items]
Total depreciation expense	377,022	336,542	302,011
Selling, General and Administrative Expenses [Member]
Schedule of depreciation expense [Line Items]
Total depreciation expense	15,331	19,487	22,387
Research and Development Expense [Member]
Schedule of depreciation expense [Line Items]
Total depreciation expense	$ 14,360	$ 10,600	$ 5,981

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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 2,956,450	$ 2,759,546	$ 2,776,359
Cost of sales	2,411,937	2,335,736	2,285,790
Gross profit	544,513	423,810	490,569
Selling, general and administrative	247,779	217,000	246,513
Research and development	64,625	54,118	50,386
Total operating expenses	312,404	271,118	296,899
Operating income	232,109	152,692	193,670
Interest expense	96,739	83,974	74,212
Interest expense, related party	9,169	13,969	12,394
Other expense, net	(2,214)	(638)	(13,930)
Total other expense, net	(108,122)	(98,581)	(100,536)
Income before taxes and equity in earnings of unconsolidated affiliate	123,987	54,111	93,134
Income tax expense	22,646	17,001	7,124
Income before equity in earnings of unconsolidated affiliate	101,341	37,110	86,010
Equity in earnings of J-Devices	(10,316)	(5,592)	(7,085)
Net income	111,657	42,702	93,095
Net income attributable to noncontrolling interests	(2,361)	(884)	(1,287)
Net income attributable to Amkor	$ 109,296	$ 41,818	$ 91,808
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.58	$ 0.26	$ 0.48
Diluted (in dollars per share)	$ 0.50	$ 0.24	$ 0.39
Shares used in computing per common share amounts:
Basic (in shares)	187,032	160,105	190,829
Diluted (in shares)	235,330	243,004	273,686

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Pension and Severance Plans (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013			2012			2011
	(In thousands)
Balance at the beginning of year	$	126,762		$	106,715		$	88,899
Provision of severance benefits	26,550			19,667			26,705
Severance payments	(10,402		)	(8,520		)	(6,717		)
Loss (gain) on foreign currency	2,463			8,900			(2,172		)
	145,373			126,762			106,715
Payments remaining with the National Pension Fund	(241		)	(249		)	(239		)
Total severance obligation balance at the end of year	145,132			126,513			106,476
Less current portion of accrued severance obligation (Note 13)	11,197			9,516			7,476
Non-current portion of severance obligation	$	133,935		$	116,997		$	99,000

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, 2013 and 2012.

	For the Year Ended December 31,
	2013			2012
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	80,528		$	78,897
Service cost	5,909			6,362
Interest cost	3,170			3,270
Benefits paid	(1,602		)	(1,168		)
Actuarial gains	(2,513		)	(3,899		)
Acquisition (Note 3)	13,017			—
Effects of curtailment	(176		)	554
Settlement	(8,701		)	(4,925		)
Foreign exchange (gain) loss	(8,060		)	1,437
Projected benefit obligation at end of year	81,572			80,528
Change in plan assets:
Fair value of plan assets at beginning of year	58,146			48,801
Actual gain on plan assets	5,159			3,500
Employer contributions	1,120			8,687
Settlement	(8,701		)	(4,925		)
Benefits paid	(1,602		)	(1,168		)
Foreign exchange (loss) gain	(3,818		)	3,251
Fair value of plan assets at end of year	50,304			58,146
Funded status of the Plans at end of year	$	(31,268	)	$	(22,382	)

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:

	Initial Net Obligation			Prior Service Cost			Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2011, net of tax ($1.4 million)	$	(58	)	$	(31	)	$	(10,421	)	$	(10,510	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	6			219			181			406
Net gain arising during period, net of tax (less than $0.1 million)	—			—			4,731			4,731
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.1 million)	6			219			4,912			5,137
Balance at December 31, 2012, net of tax ($1.3 million)	$	(52	)	$	188		$	(5,509	)	$	(5,373	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	8			250			106			364
Net gain arising during period, net of tax ($0.2 million)	—			—			3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.3 million)	8			250			4,102			4,360
Balance at December 31, 2013, net of tax ($1.0 million)	$	(44	)	$	438		$	(1,407	)	$	(1,013	)
Estimated amortization of cost to be included in 2014 net periodic pension cost	$	5		$	211		$	66		$	282

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,
	2013		2012
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	73,326	$	80,528
Aggregate fair value of plan assets	41,957		58,146
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	24,877		17,816
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,
	2013			2012			2011
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,909		$	6,362		$	5,744
Interest cost	3,170			3,270			3,274
Expected return on plan assets	(3,508		)	(3,188		)	(3,119		)
Amortization of transition obligation	7			7			8
Amortization of prior service cost	231			291			269
Recognized actuarial loss	135			218			83
Net periodic pension cost	5,944			6,960			6,259
Curtailment (gain) loss	(176		)	1,089			1,016
Settlement (gain) loss	(120		)	(100		)	565
Total pension expense	$	5,648		$	7,949		$	7,840

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, 2013, 2012 and 2011:

	For the Year Ended December 31,
	2013		2012		2011
Discount rate for determining net periodic pension cost	3.9	%	4.2	%	5.2	%
Discount rate for determining benefit obligations at year end	3.9	%	4.0	%	4.2	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.5	%	4.6	%
Rate of compensation increase for determining benefit obligations at year end	4.1	%	4.1	%	4.5	%
Expected rate of return on plan assets for determining net periodic pension cost	6.3	%	6.3	%	6.4	%

Schedule of Allocation of Plan Assets

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 18, 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 fair value of our pension plan assets at December 31, 2012, by asset category utilizing the fair value hierarchy as discussed in Note 18, 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	$	1,348	$	—	$	1,348
Equity securities
Foreign securities	394		—		394
U.S. securities	9,046		—		9,046
	9,440		—		9,440
U.S. fixed income funds	1,714		—		1,714
Bonds
U.S. government bonds	2,070		6,448		8,518
Foreign government bonds	406		—		406
Foreign treasury notes	27,503		—		27,503
	29,979		6,448		36,427
Taiwan retirement fund	8,720		—		8,720
Other	377		120		497
Total	$	51,578	$	6,568	$	58,146

Schedule of Expected Benefit Payments

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

	Payments
	(In thousands)
2014	$	2,663
2015	3,410
2016	2,901
2017	3,198
2018	4,047
2019 to 2023	33,275

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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets | Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Cash equivalent money market funds	$ 300,352	$ 151,066
Restricted cash money market funds	2,681	2,680
Significant Unobservable Inputs | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses on long-lived assets held for use or disposal	(1,529)	(763)	(3,336)
Fair value assets measured on recurring basis
Long-lived assets held for use or disposal	1,055	868
Research and Development Expense [Member] | Significant Unobservable Inputs | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses on long-lived assets held for use or disposal	(800)
Cost of Sales [Member] | Significant Unobservable Inputs | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses on long-lived assets held for use or disposal	$ (700)

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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
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)	10,000,000	10,000,000
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)	500,000,000	500,000,000
Common stock, shares issued (in shares)	262,109,000	197,709,000
Common stock, shares outstanding (in shares)	216,702,000	152,397,000
Treasury stock, shares	45,407,000	45,312,000

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Accumulated Other Comprehensive Income and Loss (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	$ (255)	$ 11,241	$ 10,849
Other comprehensive income (loss) before reclassifications	(11,860)	(14)
Amounts reclassified from accumulated other comprehensive (loss) income	364	406
Other comprehensive income (loss)	(11,496)	392	(4,608)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(1,013)	(5,373)	(10,510)
Other comprehensive income (loss) before reclassifications	3,996	4,731
Amounts reclassified from accumulated other comprehensive (loss) income	364	406
Other comprehensive income (loss)	4,360	5,137
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	11,451	16,346	19,034
Other comprehensive income (loss) before reclassifications	(4,895)	(2,688)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Other comprehensive income (loss)	(4,895)	(2,688)
Equity Interest in Investee Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(10,693)	268	2,325
Other comprehensive income (loss) before reclassifications	(10,961)	(2,057)
Amounts reclassified from accumulated other comprehensive (loss) income	0	0
Other comprehensive income (loss)	$ (10,961)	$ (2,057)

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Other Income and Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expense [Abstract]
Interest income	$ (3,785)	$ (3,160)	$ (2,749)
Foreign currency (gain) loss	(5,626)	4,185	2,178
Loss on debt retirement, net	12,330	1,199	15,531
Other income, net	(705)	(1,586)	(1,030)
Total other expense, net	$ 2,214	$ 638	$ 13,930

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Commitments and Contingencies (Future minimum lease payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
2014	$ 23,380,000
2015	14,937,000
2016	4,116,000
2017	4,060,000
2018	4,031,000
Thereafter	6,445,000
Total	56,969,000
Operating Leases, Rent Expense, Net	$ 23,800,000	$ 13,200,000	$ 15,100,000

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Other Income and Expense (Tables)

12 Months Ended

Dec. 31, 2013

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

Other income and expense consists of the following:

	December 31,
	2013			2012			2011
	(In thousands)
Interest income	$	(3,785	)	$	(3,160	)	$	(2,749	)
Foreign currency (gain) loss	(5,626		)	4,185			2,178
Loss on debt retirement, net	12,330			1,199			15,531
Other income, net	(705		)	(1,586		)	(1,030		)
Total other expense, net	$	2,214		$	638		$	13,930

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Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 8,218,000	$ 7,930,000	$ 10,503,000
Additions based on tax positions related to the current year	17,752,000	5,551,000	24,000
Additions for tax positions of prior years	2,723,000	54,000	699,000
Reductions for tax positions of prior years	(108,000)	(4,091,000)	(2,248,000)
Reductions related to settlements with tax authorities	1,353,000	1,226,000	991,000
Reductions from lapse of statutes of limitations	(104,000)	0	(57,000)
Balance, end of period	27,128,000	8,218,000	7,930,000
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	18,900,000
Liability for uncertain tax positions	5,100,000
Tax Deductions [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	19,700,000
Revenue Attribution [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	600,000
Contested Prior Year Deductions In Foreign Jurisdictions [Member]
Income tax contingency [Abstract]
Unrecognized tax benefits, period increase (decrease)	$ (1,400,000)

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Accrued Expenses

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Accrued Expenses

13. Accrued Expenses

Accrued expenses consist of the following:

	December 31,
	2013		2012
	(In thousands)
Payroll and benefits	$	75,909	$	56,651
Deferred revenue and customer advances	44,764		52,773
Accrued royalties (Note 19)	43,324		33,324
Accrued interest	21,807		19,048
Acquisition payable (Note 3)	17,897		—
Income taxes payable	17,528		8,341
Accrued severance plan obligations (Note 15)	11,197		9,516
Other accrued expenses	31,826		33,311
Total accrued expenses	$	264,252	$	212,964

Accrued royalties relate to our estimate of royalties due as a result of our pending patent license litigation (Note 19).

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013			2012		2011
	(In thousands)
United States	$	(36,829	)	$	17,062	$	(8,097	)
Foreign	160,816			37,049		101,231
Total income before income taxes	$	123,987		$	54,111	$	93,134

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,
	2013			2012			2011
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	—			(75		)	377
Foreign	30,902			10,998			8,986
	30,902			10,923			9,363
Deferred
Federal	(8,556		)	1,859			2,356
State	9			266			337
Foreign	291			3,953			(4,932		)
	(8,256		)	6,078			(2,239		)
Total provision	$	22,646		$	17,001		$	7,124

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,
	2013			2012			2011
	(In thousands)
U.S. federal tax at 35%	$	43,396		$	18,939		$	32,559
State taxes, net of federal benefit	1,124			1,126			1,451
Foreign income taxed at different rates	(17,814		)	(14,717		)	(22,507		)
Foreign exchange gain (loss)	844			12,329			(5,966		)
Change in valuation allowance	(32,415		)	(3,112		)	(8,672		)
Adjustments related to prior years	2,727			(2,464		)	3,582
Income tax credits generated	(2,622		)	(1,370		)	(466		)
Repatriation of foreign earnings and profits	6,499			3,240			3,388
Expiration of capital loss carryforward	15,555			—			—
Equity in earnings of J-Devices	—			2,404			3,047
Acquisition expenses	1,381			—			—
Debt conversion costs	4,067			—			—
Other	(96		)	626			708
Total	$	22,646		$	17,001		$	7,124

Schedule of Deferred Tax Assets and Liabilities

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

	December 31,
	2013			2012
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	147,905		$	155,270
Capital loss carryforwards	—			18,221
Income tax credits	27,751			31,665
Property, plant and equipment	14,390			283
Accrued liabilities	57,374			46,045
Unrealized foreign exchange loss	3,893			3,949
Other	15,137			19,252
Total deferred tax assets	266,450			274,685
Valuation allowance	(179,183		)	(209,757		)
Total deferred tax assets net of valuation allowance	87,267			64,928
Deferred tax liabilities:
Property, plant and equipment	21,716			3,263
Deferred gain	6,295			6,899
Other	1,967			13,031
Total deferred tax liabilities	29,978			23,193
Net deferred tax assets	$	57,289		$	41,735
Recognized as:
Other current assets	$	10,729		$	12,615
Other assets	47,609			40,047
Accrued expenses	(97		)	(800		)
Other non-current liabilities	(952		)	(10,127		)
Total	$	57,289		$	41,735

Summary of Operating Loss Carryforwards

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

	For the Year Ended December 31,
	2013		2012		Expiration
	(In thousands)
U.S. Federal NOL’s	$	342,770	$	363,913	2021-2033
U.S. State NOL’s	197,618		210,539		2014-2031
Foreign NOL’s	38,337		56,393		2014-2022

Summary of Income Tax Examinations

Summarized below are the years subject to examination for our largest subsidiaries.

Jurisdiction	Years
United States	2010-2013
Korea	2008-2013
Philippines	2010-2013
Japan	2008-2013
China	2008-2013
Singapore	2009-2013
Malaysia	2007-2013
Taiwan	2010-2013

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,
	2013			2012			2011
	(In thousands)
Balance at January 1	$	8,218		$	7,930		$	10,503
Additions based on tax positions related to the current year	17,752			5,551			24
Additions for tax positions of prior years	2,723			54			699
Reductions for tax positions of prior years	(108		)	(4,091		)	(2,248		)
Reductions related to settlements with tax authorities	(1,353		)	(1,226		)	(991		)
Reductions from lapse of statutes of limitations	(104		)	—			(57		)
Balance at December 31	$	27,128		$	8,218		$	7,930

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Commitments and Contingencies (Details) (USD $)	12 Months Ended			1 Months Ended		24 Months Ended		1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2013 Tessera Inc Legal Proceedings [Member]	Aug. 31, 2012 Tessera Inc Legal Proceedings [Member]	Dec. 31, 2013 Tessera Inc Legal Proceedings [Member]	Jul. 31, 2012 Tessera Inc Legal Proceedings [Member] patents	Feb. 28, 2013 Tessera Inc Legal Proceedings [Member] Minimum [Member]	Dec. 31, 2013 Carsem Legal Proceedings [Member] Minimum [Member] claims	Dec. 31, 2013 Cost of Sales [Member] Tessera Inc Legal Proceedings [Member]	Dec. 31, 2012 Cost of Sales [Member] Tessera Inc Legal Proceedings [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member]	Dec. 31, 2012 $150 Million Senior Secured Credit Facility [Member]	Dec. 31, 2013 Letter of Credit [Member]
Loss Contingencies [Line Items]
Other Commitment	$ 24,000,000
Credit facility, borrowing capacity												150,000,000.0		25,000,000.0
Available letter of credit subfacility utilized												0	0	300,000
Letter of credit sublimit facility remaining														24,700,000
Number of domestic patents							1
Damages sought				in excess of $150 million
Damages sought, value								150,000,000
Interest expense	96,739,000	83,974,000	74,212,000
Loss Contingency, Range of Possible Loss, Minimum						60,000,000
Loss Contingency, Range of Possible Loss, Maximum						135,000,000
Loss Contingency, Loss in Period						60,000,000				10,000,000	50,000,000
Payments for legal settlements					16,700,000
Number of valid asserted patent claims									1
Accrued royalties (Note 19)	43,324,000	33,324,000
Loss Contingency, Range of Estimated Royalties to be Paid, Minimum						43,300,000
Loss Contingency, Range of Estimated Royalties to be Paid, Maximum						$ 118,300,000

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Pension and Severance Plans

12 Months Ended

Dec. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Pension and Severance Plans

15.Pension and Severance Plans

U.S. Defined Contribution Plan

We have a defined contribution plan covering substantially all U.S. employees. Eligible employees can contribute up to 60% of their salary, subject to annual Internal Revenue Service limitations. We match in cash 75% of the employee’s contributions up to a defined maximum as determined on an annual basis. The expense for this plan was $1.8 million in 2013 and 2012 and $1.9 million in 2011.

Malaysia Defined Contribution Plan

We have a defined contribution plan under the Employees Provident Fund Act in Malaysia whereby employees contribute up to 11% of their salary. We contribute an amount equivalent to no less than 12% of the employees’ salaries up to a defined maximum into their individual accounts. The expense for this plan was $1.0 million in 2013.

Taiwan Defined Contribution Plan

We have a defined contribution plan under the Taiwanese Labor Pension Act in Taiwan whereby employees can contribute up to 6% of their salary. We contribute an amount equivalent to no less than 6% of the employees’ salaries up to a defined maximum into their individual accounts. The expense for this plan was $2.4 million in 2013 and $2.3 million in 2012 and 2011.

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,
	2013			2012			2011
	(In thousands)
Balance at the beginning of year	$	126,762		$	106,715		$	88,899
Provision of severance benefits	26,550			19,667			26,705
Severance payments	(10,402		)	(8,520		)	(6,717		)
Loss (gain) on foreign currency	2,463			8,900			(2,172		)
	145,373			126,762			106,715
Payments remaining with the National Pension Fund	(241		)	(249		)	(239		)
Total severance obligation balance at the end of year	145,132			126,513			106,476
Less current portion of accrued severance obligation (Note 13)	11,197			9,516			7,476
Non-current portion of severance obligation	$	133,935		$	116,997		$	99,000

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, 2013 and 2012.

	For the Year Ended December 31,
	2013			2012
	(In thousands)
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	80,528		$	78,897
Service cost	5,909			6,362
Interest cost	3,170			3,270
Benefits paid	(1,602		)	(1,168		)
Actuarial gains	(2,513		)	(3,899		)
Acquisition (Note 3)	13,017			—
Effects of curtailment	(176		)	554
Settlement	(8,701		)	(4,925		)
Foreign exchange (gain) loss	(8,060		)	1,437
Projected benefit obligation at end of year	81,572			80,528
Change in plan assets:
Fair value of plan assets at beginning of year	58,146			48,801
Actual gain on plan assets	5,159			3,500
Employer contributions	1,120			8,687
Settlement	(8,701		)	(4,925		)
Benefits paid	(1,602		)	(1,168		)
Foreign exchange (loss) gain	(3,818		)	3,251
Fair value of plan assets at end of year	50,304			58,146
Funded status of the Plans at end of year	$	(31,268	)	$	(22,382	)

The accrued benefit liability, included in pension and severance obligations in the Consolidated Balance Sheets, as of December 31, 2013 and 2012 was $31.3 million and $22.4 million, respectively. The accumulated benefit obligation as of December 31, 2013 and 2012 was $55.9 million and $54.6 million, respectively.

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

	Initial Net Obligation			Prior Service Cost			Actuarial Net (Loss) Gain			Total
	(In thousands)
Balance at December 31, 2011, net of tax ($1.4 million)	$	(58	)	$	(31	)	$	(10,421	)	$	(10,510	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	6			219			181			406
Net gain arising during period, net of tax (less than $0.1 million)	—			—			4,731			4,731
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.1 million)	6			219			4,912			5,137
Balance at December 31, 2012, net of tax ($1.3 million)	$	(52	)	$	188		$	(5,509	)	$	(5,373	)
Amortization included in net periodic pension cost, net of tax (less than $0.1 million)	8			250			106			364
Net gain arising during period, net of tax ($0.2 million)	—			—			3,996			3,996
Adjustments to unrealized components of defined benefit pension plan included in other comprehensive income, net of tax ($0.3 million)	8			250			4,102			4,360
Balance at December 31, 2013, net of tax ($1.0 million)	$	(44	)	$	438		$	(1,407	)	$	(1,013	)
Estimated amortization of cost to be included in 2014 net periodic pension cost	$	5		$	211		$	66		$	282

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

	December 31,
	2013		2012
	(In thousands)
Plans with underfunded or non-funded projected benefit obligation:
Aggregate projected benefit obligation	$	73,326	$	80,528
Aggregate fair value of plan assets	41,957		58,146
Plans with underfunded or non-funded accumulated benefit obligation:
Aggregate accumulated benefit obligation	24,877		17,816
Aggregate fair value of plan assets	—		—

The following table summarizes net periodic pension costs:

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Components of net periodic pension cost and total pension expense:
Service cost	$	5,909		$	6,362		$	5,744
Interest cost	3,170			3,270			3,274
Expected return on plan assets	(3,508		)	(3,188		)	(3,119		)
Amortization of transition obligation	7			7			8
Amortization of prior service cost	231			291			269
Recognized actuarial loss	135			218			83
Net periodic pension cost	5,944			6,960			6,259
Curtailment (gain) loss	(176		)	1,089			1,016
Settlement (gain) loss	(120		)	(100		)	565
Total pension expense	$	5,648		$	7,949		$	7,840

The following table summarizes the weighted-average assumptions used in computing the net periodic pension cost and projected benefit obligation at December 31, 2013, 2012 and 2011:

	For the Year Ended December 31,
	2013		2012		2011
Discount rate for determining net periodic pension cost	3.9	%	4.2	%	5.2	%
Discount rate for determining benefit obligations at year end	3.9	%	4.0	%	4.2	%
Rate of compensation increase for determining net periodic pension cost	4.1	%	4.5	%	4.6	%
Rate of compensation increase for determining benefit obligations at year end	4.1	%	4.1	%	4.5	%
Expected rate of return on plan assets for determining net periodic pension cost	6.3	%	6.3	%	6.4	%

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 domestic and U.S.) and 45% equity securities (primarily U.S. and Europe). Philippine plan assets included Amkor common stock totaling $0.6 million and $0.4 million at December 31, 2013, and December 31, 2012, respectively.

The fair value of our pension plan assets at December 31, 2013, by asset category utilizing the fair value hierarchy as discussed in Note 18, 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 fair value of our pension plan assets at December 31, 2012, by asset category utilizing the fair value hierarchy as discussed in Note 18, 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	$	1,348	$	—	$	1,348
Equity securities
Foreign securities	394		—		394
U.S. securities	9,046		—		9,046
	9,440		—		9,440
U.S. fixed income funds	1,714		—		1,714
Bonds
U.S. government bonds	2,070		6,448		8,518
Foreign government bonds	406		—		406
Foreign treasury notes	27,503		—		27,503
	29,979		6,448		36,427
Taiwan retirement fund	8,720		—		8,720
Other	377		120		497
Total	$	51,578	$	6,568	$	58,146

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.

Our other category of plan assets included receivables and payables at December 31, 2013 and December 31, 2012.

We contributed $1.1 million, $8.7 million and $3.6 million to the Plans during 2013, 2012 and 2011, respectively, and we expect to contribute $2.5 million during 2014. 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)
2014	$	2,663
2015	3,410
2016	2,901
2017	3,198
2018	4,047
2019 to 2023	33,275

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Earnings Per Share (Antidilutive) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive shares	4,890	4,416	6,859
Convertible Notes Due 2014 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate of convertible subordinated notes	6.00%
Convertible Notes Due 2013 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate of convertible subordinated notes	6.25%
Convertible Notes Due 2011 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Interest rate of convertible subordinated notes	2.50%

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Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, 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, 2010
Treasury Stock, Shares							(28,731,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 93,095	$ 91,808			$ 91,808			$ 1,287
Other comprehensive income	(4,608)	(4,608)				(4,608)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest								0
Conversion of debt to common stock	100,497	100,497	13	100,484
Conversion of debt to common stock, shares			13,351,000
Repurchase of common stock	(129,500)	(129,500)					(129,500)
Repurchase of common stock, number of shares							(28,573,000)
Treasury stock acquired through surrender of shares for tax withholding	(776)	(776)					(776)
Treasury stock acquired through surrender of shares for tax withholding, shares							(111,000)
Issuance of stock through share-based compensation plans	822	822	1	821
Issuance of stock through share-based compensation plans, shares			541,000
Share-based compensation expense	5,010	5,010		5,010
Balance at end of period at Dec. 31, 2011	701,221	693,266	197	1,611,242	(798,462)	10,849	(130,560)	7,955
Balance at end of period, shares at Dec. 31, 2011			197,359,000
Treasury Stock, Shares	(45,312,000)						(45,312,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,702	41,818			41,818			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							(16,472,000)
Treasury stock acquired through surrender of shares for tax withholding	(609)	(609)					(609)
Treasury stock acquired through surrender of shares for tax withholding, shares							(109,000)
Issuance of stock through share-based compensation plans	182	182	1	181
Issuance of stock through share-based compensation plans, shares			350,000
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	197,709,000		197,709,000
Treasury Stock, Shares	(45,407,000)						(45,407,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	111,657	109,296			109,296			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			64,027,000
Treasury stock acquired through surrender of shares for tax withholding	(466)	(466)					(466)
Treasury stock acquired through surrender of shares for tax withholding, shares							(95,000)
Issuance of stock through share-based compensation plans	446	446		446			0
Issuance of stock through share-based compensation plans, shares			373,000
Share-based compensation expense	2,971	2,971		2,971			0
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	262,109,000		262,109,000

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 111,657	$ 42,702	$ 93,095
Other comprehensive (loss) income, net of tax:
Adjustments to unrealized components of defined benefit pension plans, net of tax (expense) benefit of ($252), ($35) and $362	4,360	5,137	(5,800)
Cumulative translation adjustment	(4,895)	(2,688)	1,539
Equity interest in J-Devices' other comprehensive loss, net of tax benefit (expense) of $202, $1,552 and ($1,754)	(10,961)	(2,057)	(347)
Total other comprehensive (loss) income	(11,496)	392	(4,608)
Comprehensive income	100,161	43,094	88,487
Comprehensive income attributable to noncontrolling interests	2,361	884	1,287
Comprehensive income attributable to Amkor	$ 97,800	$ 42,210	$ 87,200

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Accounts Receivable, Trade

12 Months Ended

Dec. 31, 2013

Accounts Receivable, Trade [Abstract]

Accounts Receivable, Trade

8. Accounts Receivable, Trade

Accounts receivable, trade consist of the following:

	December 31,
	2013			2012
	(In thousands)
Accounts receivable	$	389,157		$	391,969
Allowance for sales credits	(7,044		)	(2,255		)
Allowance for doubtful accounts	(76		)	(15		)
Total accounts receivable trade, net of allowances	$	382,037		$	389,699

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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, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance	$ 179,183	$ 209,757	$ 214,269	$ 223,612
Valuation Allowances and Reserves, Charged to Cost and Expense	(16,860)	(1,626)	(509)
Valuation Allowances and Reserves, Write-offs	(15,555)	(1,486)	(8,163)
Valuation Allowances and Reserves, Charged to Other Accounts	1,841	(1,400)	(671)
Valuation Allowances and Reserves, Balance	$ 179,183	$ 209,757	$ 214,269	$ 223,612

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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, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Employer contributions		$ 1,120,000	$ 8,687,000	$ 3,600,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	2,500,000
2013	2,663,000	2,663,000
2014	3,410,000	3,410,000
2015	2,901,000	2,901,000
2016	3,198,000	3,198,000
2017	4,047,000	4,047,000
2018 to 2022	$ 33,275,000	$ 33,275,000

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Pension and Severance Plans (Impact on Accumulated Other Comprehensive Income) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	$ (5,373,000)	$ (10,510,000)
Amortization included in net periodic pension cost, net of tax	364,000	406,000
Net gain arising during period, net of tax	3,996,000	4,731,000
Unrecognized pension costs, end of year	(1,013,000)	(5,373,000)	(10,510,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	282,000
Prior service cost recognized in net periodic pension cost, Tax	100,000	100,000
Net gain (loss) recognized in net periodic benefit cost, Tax	200,000	100,000
Adjustments to unrealized components of defined benefit pension plans, tax effect	252,000	35,000	(362,000)
Unrealized components of defined benefit pension plan, tax	1,000,000	1,300,000	1,400,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	4,360,000	5,137,000	(5,800,000)
Initial Net Obligation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	(52,000)	(58,000)
Amortization included in net periodic pension cost, net of tax	8,000	6,000
Net gain arising during period, net of tax	0	0
Unrecognized pension costs, end of year	(44,000)	(52,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	5,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	8,000	6,000
Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	188,000	(31,000)
Amortization included in net periodic pension cost, net of tax	250,000	219,000
Net gain arising during period, net of tax	0	0
Unrecognized pension costs, end of year	438,000	188,000
Estimated amortization of cost to be included in 2012 net periodic pension cost	211,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	250,000	219,000
Actuarial Net Gain Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrecognized pension costs, beginning of year	(5,509,000)	(10,421,000)
Amortization included in net periodic pension cost, net of tax	106,000	181,000
Net gain arising during period, net of tax	3,996,000	4,731,000
Unrecognized pension costs, end of year	(1,407,000)	(5,509,000)
Estimated amortization of cost to be included in 2012 net periodic pension cost	66,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 4,102,000	$ 4,912,000

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Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2014	Jun. 30, 2012
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	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		217,901,240
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 330.5

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Inventories

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Inventories

9. Inventories

Inventories consist of the following:

	December 31,
	2013		2012
	(In thousands)
Raw materials and purchased components	$	147,292	$	166,691
Work-in-process	53,131		60,748
Total inventories	$	200,423	$	227,439

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Investments Summary Balance Sheet Information (Details) (J Devices [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
J Devices [Member]
Summary Balance Sheet Information of Equity Method Investee [Line Items]
Current assets	$ 352,628	$ 240,759
Non-current assets (including property, plant and equipment)	234,241	201,459
Current liabilities (including debt)	298,401	225,531
Total debt	131,275	144,733
Non-current liabilities (including debt)	108,928	96,612
Total stockholders' equity	$ 179,540	$ 120,075

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Pension and Severance Plans (Changes and Components) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost	$ 5,909	$ 6,362	$ 5,744
Interest cost	3,170	3,270	3,274
Expected return on plan assets	(3,508)	(3,188)	(3,119)
Amortization of transition obligation	7	7	8
Amortization of prior service cost	231	291	269
Recognized actuarial loss	135	218	83
Net periodic pension cost	5,944	6,960	6,259
Curtailment (gain) loss	(176)	1,089	1,016
Settlement (gain) loss	8,701	4,925
Defined Benefit Plan, Recognized Net (Gain) Loss Due to Settlements	(120)	(100)	565
Total pension expense	$ 5,648	$ 7,949	$ 7,840

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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Adjustments to unrealized components of defined benefit pension plans, tax effect	$ (252)	$ (35)	$ 362
Equity interest in J-Devices' other comprehensive loss, tax effect	$ 202	$ 1,552	$ (1,754)

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Business Acquisitions Business Acquisitions

12 Months Ended

Dec. 31, 2013

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 approximately ¥6 billion ($60 million), based on the estimated net asset value at closing. The price for the shares is subject to adjustment to the extent the actual net asset value at closing was more or less than the estimate. We paid ¥4.1 billion ($42 million) in cash at closing and are obligated to pay the remaining ¥1.9 billion ($18 million) by March 31, 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. 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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New Accounting Standards

12 Months Ended

Dec. 31, 2013

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards

2. New Accounting Standards

Recently Adopted Standards

In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Topic 220). ASU 2013-02 requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income ("AOCI") by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. ASU 2013-02 does not change the current requirements for reporting net income or other comprehensive income in the financial statements. This ASU is effective for reporting periods beginning after December 15, 2012. ASU 2013-02 was adopted on January 1, 2013 and did not have a significant impact on our financial statements.

Recently Issued Standards

In March 2013, the FASB issued 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 may affect our financial statements to the extent we sell or cease to hold a controlling interest in subsidiaries or groups of assets within a foreign entity.

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Debt

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Debt

14. Debt

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

	December 31,
	2013			2012
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior secured credit facilities:
$150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017	$	—		$	—
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 (1)	525,000			300,000
Senior subordinated notes:
6.0% Convertible senior subordinated notes (2)	56,350			250,000
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, foreign currency funding-linked base rate plus 2.30%, due March 2015 (4)	80,000			100,000
Term loan, LIBOR plus 3.70%, due June 2016 (5)	70,000			—
Term loan, LIBOR plus 3.90% or 3.94%, due July 2017 (6)	90,000			137,000
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (7)	10,000			—
Term loan, LIBOR plus 3.70%, due December 2019 (8)	70,000			13,000
Other:
Revolving credit facility, TAIFX plus a bank-determined spread, due April 2015 (Taiwan) (9)	—			—
	1,646,350			1,545,000
Add: Unamortized premium (1)	6,390			—
Less: Short-term borrowings and current portion of long-term debt	(61,350		)	—
Long-term debt (including related party)	$	1,591,390		$	1,545,000

(1) In September 2012, we issued $300.0 million of 6.375% Senior Notes due October 2022 (the “2022 Notes”). The 2022 Notes were issued at par and are senior unsecured obligations. Interest is payable semi-annually on April 1 and October 1 of each year, and commenced April 1, 2013. In May 2013, we issued an additional $225.0 million of 6.375% Senior Notes due October 2022 (the “Additional 2022 Notes”) under the same terms as the 2022 Notes. The Additional 2022 Notes were issued at a premium of 103% or $6.8 million. The net proceeds from the issuance of the Additional 2022 Notes were designated for general corporate purposes. We incurred $3.4 million of debt issuance costs associated with the Additional 2022 Notes.

(2) In April 2009, we issued $250 million of our 6.0% Convertible Senior Subordinated Notes due April 2014 (the “2014 Notes”). The 2014 Notes are 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. The 2014 Notes are subordinated to the prior payment in full of all of our senior debt. The 2014 Notes were purchased by certain qualified institutional buyers and an entity controlled by Mr. James J. Kim, our Executive Chairman of the Board of Directors. Mr. Kim's affiliate purchased $150.0 million of the 2014 Notes. In June 2013, we completed a tender offer for the 2014 Notes and exchanged $193.7 million of the 2014 Notes, including the $150.0 million held by Mr. Kim's affiliate, for an aggregate 64.0 million shares of our common stock and a cash payment of $11.6 million. The cash payment was equivalent to the remaining coupons for the tendered notes and was recorded as a charge in our Consolidated Statements of Income for the year ended December 31, 2013.

(3) In June 2012, we entered into a $41.0 million revolving credit facility with a Korean Bank with a term of 12 months. Principal is payable upon maturity and interest is paid monthly. 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. As of December 31, 2013, $41.0 million was available to be borrowed for general working capital purposes.

(4) In March 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2015. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity, however an early repayment of $20.0 million was made in November 2013.

(5) In April 2013, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $150.0 million through April 2016. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable at maturity. In December 2013, the loan agreement was amended which adjusted the base interest rate from 3.80% to 3.70%. As of December 31, 2013, $80.0 million was available to be borrowed for general working capital purposes and the repayment of inter-company debt.

(6) In June 2012, we entered into a $150.0 million secured term loan for five years with a Korean bank which is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. The $150.0 million consists of two components, $50.0 million of the proceeds ("Tranche A") which was used to fully repay our term loan due July 2014 and $100.0 million ("Tranche B") to fund capital expenditures. The term loan was fully drawn in January 2013. Principal is payable upon maturity; however, an early repayment of $60.0 million was made in December 2013.

(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. As of December 31, 2013, $140.0 million was available to be borrowed for capital expenditures.

(8) In November 2012, we entered into a loan agreement with a Korean bank pursuant to which we may borrow up to $100.0 million through March 2014. In November 2013, the loan agreement was amended which extended the borrowing period from November 2013 to March 2014. The loan is collateralized by substantially all the land, factories and equipment located at our facilities in Korea. Principal is payable upon maturity. As of December 31, 2013, $30.0 million was available to be borrowed for capital expenditures.

(9) 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, 2013, $29.0 million was available to be drawn for general corporate purposes and capital expenditures.

Interest Rates

As of December 31, 2013, we had a total of $1,646.4 million of debt of which 80.6% was fixed rate debt and 19.4% was variable rate debt. As of December 31, 2012, we had a total of $1,545.0 million of debt of which 83.8% was fixed rate debt and 16.2% was variable rate debt. The fixed rate debt consists of senior notes and senior subordinated notes. Our variable rate debt principally relates to our foreign borrowings and revolving lines of credit and any amounts outstanding under our $150.0 million senior and secured revolving line of credit.

Interest is payable semiannually on each of the senior notes and senior subordinated notes and interest is payable semi-annually, quarterly or monthly on the 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,
	2013		2012
Amkor Technology, Inc.
Amkor Technology Korea, Inc.:
Term loan, foreign currency funding-linked base rate plus 2.30%, due March 2015	4.29	%	4.21	%
Term loan, LIBOR plus 3.70%, due June 2016	3.95	%	—
Term loan, LIBOR plus 3.90%, due July 2017 (Tranche A)	4.14	%	4.26	%
Term loan, LIBOR plus 3.94%, due July 2017 (Tranche B)	4.18	%	4.26	%
Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017	3.76	%	—
Term loan, LIBOR plus 3.70%, due December 2019	3.95	%	4.01	%

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 indentures governing our senior and senior subordinated notes 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, 2013 and 2012.

Maturities

	Total Debt
	(In thousands)
Payments due for the year ending December 31,
2014	$	61,350
2015	85,000
2016	70,000
2017	90,000
2018	345,000
Thereafter	995,000
Total debt	$	1,646,350

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Property, Plant and Equipment

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

10. Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2013			2012
	(In thousands)
Land	$	208,048		$	106,338
Land use rights	26,845			19,945
Buildings and improvements	911,258			904,919
Machinery and equipment	3,577,045			3,332,855
Software and computer equipment	193,641			191,132
Furniture, fixtures and other equipment	17,430			19,194
Construction in progress	27,039			24,670
	4,961,306			4,599,053
Less accumulated depreciation and amortization	(2,954,753		)	(2,779,084		)
Total property, plant and equipment, net	$	2,006,553		$	1,819,969

The following table presents depreciation expense as included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Cost of sales	$	377,022	$	336,542	$	302,011
Selling, general and administrative	15,331		19,487		22,387
Research and development	14,360		10,600		5,981
Total depreciation expense	$	406,713	$	366,629	$	330,379

In January 2013, we sold office space and land located in Chandler, Arizona for $22.8 million, net of selling costs of $1.2 million. During 2013, we also purchased land for a factory and research and development center in Korea for $100.3 million and incurred design costs and $1.7 million of capitalized interest associated with our spending.

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Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended			1 Months Ended		12 Months Ended		1 Months Ended						12 Months Ended					12 Months Ended			12 Months Ended				12 Months Ended			12 Months Ended			12 Months Ended			1 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2012 Korea Subsidiaries [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2012 Convertible Senior Subordinated Notes Due April 2014 [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member] Related Party [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member] Related Party [Member]	Dec. 31, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Senior Notes Due October 2022 [Member]	Dec. 31, 2012 Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 ATK Term Loan due 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2012 ATK Term Loan due 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 ATK Term Loan due 2017 [Member] Tranche A [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 ATK Term Loan due 2017 [Member] Tranche B [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Nov. 30, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member] Minimum [Member]	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member] Maximum [Member]	Dec. 31, 2013 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Dec. 31, 2012 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Dec. 31, 2013 Senior Notes Due October 2022 First Issue [Member] Senior Notes Due October 2022 [Member]	May 31, 2013 Senior Notes Due October 2022 Second Issue [Member] Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Revolving credit facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Revolving credit facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2012 Revolving credit facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]
Debt Instruments [Abstract]
Credit facility, borrowing capacity						$ 150,000,000										$ 150,000,000						$ 100,000,000		$ 150,000,000	$ 50,000,000	$ 100,000,000			$ 100,000,000	$ 150,000,000			$ 44,000,000						$ 41,000,000
Repayments of Long-term Debt		80,000,000	420,116,000	392,191,000																			60,000,000
Debt Instrument, Periodic Payment, Principal						5,000,000
Line of Credit Facility, Current Borrowing Capacity							140,000,000								80,000,000					20,000,000							30,000,000						29,000,000				41,000,000
Debt Instrument, Interest Rate at Period End							3.76%	0.00%							3.95%		0.00%			4.29%	4.21%						3.95%	4.01%
Payments of Debt Issuance Costs		3,216,000	6,007,000	5,875,000
Borrowing under senior secured credit facility																																	0	0			0	0
Senior notes																		525,000,000	300,000,000																300,000,000	225,000,000
Interest rate							1.75%			6.00%		6.00%	6.00%		3.70%	3.80%		6.375%		2.30%							3.70%				1.50%	2.25%
Debt Instrument, Unamortized Premium Percentage																																				103.00%
Debt Instrument, Unamortized Premium		6,390,000	0																																	6,800,000
Debt Issuance Cost																																				3,400,000
Gains (Losses) on Extinguishment of Debt		(12,330,000)	(1,199,000)	(15,531,000)
Convertible Subordinated Debt										56,350,000	250,000,000
Debt Instrument Term					12 months																		5 years
Proceeds from Lines of Credit		5,000,000	0	0
Description of variable rate basis							foreign currency funding-linked base rate plus 1.75%								LIBOR plus 3.70%					foreign currency funding-linked rate plus 2.30%							LIBOR plus 3.70%			LIBOR plus 1.5%-2.25%			TAIFX plus a bank-determined spread
Step down provision																																	5,000,000
Loans Payable							10,000,000	0							70,000,000		0			80,000,000	100,000,000						70,000,000	13,000,000
Debt Instrument, Convertible, Conversion Price												$ 3.02
Face amount, related party														150,000,000
Debt Conversion, Converted Instrument, Shares Issued									64.0
Payments of Debt Exchange Costs	11,600,000	11,619,000	0	0
Common stock issuance for conversion of related party 6.25% convertible subordinated notes		$ 0	$ 0	$ 100,000,000					$ 193,700,000

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Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

6. Income Taxes

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

	For the Year Ended December 31,
	2013			2012		2011
	(In thousands)
United States	$	(36,829	)	$	17,062	$	(8,097	)
Foreign	160,816			37,049		101,231
Total income before income taxes	$	123,987		$	54,111	$	93,134

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,
	2013			2012			2011
	(In thousands)
Current
Federal	$	—		$	—		$	—
State	—			(75		)	377
Foreign	30,902			10,998			8,986
	30,902			10,923			9,363
Deferred
Federal	(8,556		)	1,859			2,356
State	9			266			337
Foreign	291			3,953			(4,932		)
	(8,256		)	6,078			(2,239		)
Total provision	$	22,646		$	17,001		$	7,124

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,
	2013			2012			2011
	(In thousands)
U.S. federal tax at 35%	$	43,396		$	18,939		$	32,559
State taxes, net of federal benefit	1,124			1,126			1,451
Foreign income taxed at different rates	(17,814		)	(14,717		)	(22,507		)
Foreign exchange gain (loss)	844			12,329			(5,966		)
Change in valuation allowance	(32,415		)	(3,112		)	(8,672		)
Adjustments related to prior years	2,727			(2,464		)	3,582
Income tax credits generated	(2,622		)	(1,370		)	(466		)
Repatriation of foreign earnings and profits	6,499			3,240			3,388
Expiration of capital loss carryforward	15,555			—			—
Equity in earnings of J-Devices	—			2,404			3,047
Acquisition expenses	1,381			—			—
Debt conversion costs	4,067			—			—
Other	(96		)	626			708
Total	$	22,646		$	17,001		$	7,124

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 and certain costs in connection with our purchase of the shares of Amkor Technology Malaysia Sdn. Bhd.

Income tax expense in 2012 and 2011 includes deferred taxes on undistributed earnings from our investment in J-Devices. In 2013, 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,
	2013			2012
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	147,905		$	155,270
Capital loss carryforwards	—			18,221
Income tax credits	27,751			31,665
Property, plant and equipment	14,390			283
Accrued liabilities	57,374			46,045
Unrealized foreign exchange loss	3,893			3,949
Other	15,137			19,252
Total deferred tax assets	266,450			274,685
Valuation allowance	(179,183		)	(209,757		)
Total deferred tax assets net of valuation allowance	87,267			64,928
Deferred tax liabilities:
Property, plant and equipment	21,716			3,263
Deferred gain	6,295			6,899
Other	1,967			13,031
Total deferred tax liabilities	29,978			23,193
Net deferred tax assets	$	57,289		$	41,735
Recognized as:
Other current assets	$	10,729		$	12,615
Other assets	47,609			40,047
Accrued expenses	(97		)	(800		)
Other non-current liabilities	(952		)	(10,127		)
Total	$	57,289		$	41,735

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.

In 2011, the valuation allowance on our deferred tax assets decreased by $9.3 million primarily as a result of the write-off of net operating loss carryforwards in connection with the liquidation of our Singapore manufacturing operations and the reorganization of the corporate structure of our Philippine manufacturing operations.

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, 2013 and 2012 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 $6.6 million. As a result of net operating loss carryforwards, we were not able to recognize the excess tax benefits of stock option deductions in 2013 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 $4.8 million, $13.7 million and $5.7 million in tax benefits as a result of the tax holidays in 2013, 2012 and 2011, respectively. The benefit of the tax holidays on diluted earnings per share was approximately $0.02, $0.06 and $0.02 for 2013, 2012 and 2011, respectively.

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

	For the Year Ended December 31,
	2013		2012		Expiration
	(In thousands)
U.S. Federal NOL’s	$	342,770	$	363,913	2021-2033
U.S. State NOL’s	197,618		210,539		2014-2031
Foreign NOL’s	38,337		56,393		2014-2022

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 and capital losses available for carryforward have been fully reserved with valuation allowances at December 31, 2013 and 2012. Also, our ability to utilize our U.S. net operating and capital loss carryforwards may be limited in the future if we experience an ownership change as defined by the Internal Revenue Code.

At December 31, 2013, 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 $15.4 million expiring in varying amounts through 2018 at our subsidiary in Korea. The deferred tax assets associated with the U.S. foreign income tax credits have been fully reserved with a valuation allowance. Income tax credits generated by certain of our foreign subsidiaries in 2013, 2012 and 2011 have been recognized in our income tax provision.

Income taxes have not been provided on approximately $512.4 million of the undistributed earnings of our foreign subsidiaries at December 31, 2013, 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 $6.3 million and insignificant U.S. federal income tax after foreign tax credits.

In 2011, we provided U.S. income tax on approximately $8.9 million of foreign earnings from a Singapore subsidiary where we made the decision to commence liquidation. The U.S. income tax of $3.1 million on these foreign earnings was fully offset by the tax benefit of our U.S. net operating losses.

We operate in and file income tax returns in various U.S. and foreign jurisdictions which are subject to examination by tax authorities. Current examinations include our 2010 Philippines income tax return and our 2008-2012 Korean income tax returns. Our tax returns for open years in all jurisdictions are subject to changes upon examination. Summarized below are the years subject to examination for our largest subsidiaries.

Jurisdiction	Years
United States	2010-2013
Korea	2008-2013
Philippines	2010-2013
Japan	2008-2013
China	2008-2013
Singapore	2009-2013
Malaysia	2007-2013
Taiwan	2010-2013

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

	For the Year Ended December 31,
	2013			2012			2011
	(In thousands)
Balance at January 1	$	8,218		$	7,930		$	10,503
Additions based on tax positions related to the current year	17,752			5,551			24
Additions for tax positions of prior years	2,723			54			699
Reductions for tax positions of prior years	(108		)	(4,091		)	(2,248		)
Reductions related to settlements with tax authorities	(1,353		)	(1,226		)	(991		)
Reductions from lapse of statutes of limitations	(104		)	—			(57		)
Balance at December 31	$	27,128		$	8,218		$	7,930

The net increase in our unrecognized tax benefits was $18.9 million from December 31, 2012, to December 31, 2013. Our unrecognized tax benefits increased primarily because of $19.7 million of additions related to the characterization of deductions in a foreign jurisdiction and a $0.6 million addition related to revenue attribution. These increases were offset by $1.4 million of net reductions primarily related to the settlement of contested prior year deductions in a foreign jurisdiction. At December 31, 2013, all of our gross unrecognized tax benefits would reduce our effective tax rate, if recognized.

The liability related to our unrecognized tax benefits is $5.1 million as of December 31, 2013, and is reported as a component of other non-current liabilities. The unrecognized tax benefits in the table above include the reduction of 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 could change significantly within 12 months. Given the number of years subject to examination, the number of matters being examined and the uncertainty of the timing of resolution of the audits, we are unable to estimate the full range of possible adjustments to the balance of our gross unrecognized tax benefits.

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 (Components of income tax expense and income before taxes, by jurisdiction) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Geographic sources of income (loss) before income taxes
United States	$ (36,829)	$ 17,062	$ (8,097)
Foreign	160,816	37,049	101,231
Total income before income taxes	123,987	54,111	93,134
Components of the provision (benefit) for income taxes
Current federal tax expense	0	0	0
Current state tax (benefit) expense	0	(75)	377
Current foreign tax expense	30,902	10,998	8,986
Current income tax expense	30,902	10,923	9,363
Deferred federal tax expense	(8,556)	1,859	2,356
Deferred state tax expense	9	266	337
Deferred foreign tax expense (benefit)	291	3,953	(4,932)
Deferred income tax expense (benefit)	(8,256)	6,078	(2,239)
Income tax expense	$ 22,646	$ 17,001	$ 7,124

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Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation Plans

4. 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. The following table presents share-based compensation expense attributable to stock options and restricted shares:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Stock options	$	883	$	1,160	$	2,025
Restricted shares	2,088		1,560		2,985
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

The following table presents share-based compensation expense included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Selling, general and administrative	$	2,591	$	2,368	$	4,363
Research and development	380		352		647
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

There is no corresponding deferred income tax benefit for stock options or restricted shares.

Equity Incentive Plans

Amended and Restated 2007 Equity Incentive Plan.  On August 6, 2007, our shareholders approved the 2007 Equity Incentive Plan. On May 8, 2012, our shareholders considered certain changes to the plan which was approved as the Amended and Restated 2007 Equity Incentive Plan, (the “2007 Plan”) that 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 initial effective date of this plan was January 1, 2008, and there were originally 17,000,000 shares of our common stock reserved for issuance under the 2007 Plan.

2003 Nonstatutory Inducement Grant Stock Plan.  On September 9, 2003, we initiated the 2003 Nonstatutory Inducement Grant Stock Plan (the “2003 Plan”). The 2003 Plan generally provides for the grant to employees, directors and consultants of stock options and stock purchase rights and is generally used as an inducement benefit for the purpose of retaining new employees. There is a provision for an annual replenishment to bring the number of shares of common stock reserved for issuance under the plan up to 300,000 as of each January 1.

1998 Stock Plan.  The 1998 Stock Plan terminated in January 2008. The 1998 Stock Plan generally provided for grants to employees, directors and consultants of stock options and stock purchase rights. The options granted vest over a two to five year period.

A summary of the stock plans, the respective plan termination dates and shares available for grant as of December 31, 2013, is shown below:

Stock Plans	Amended and Restated 2007 Equity Incentive Plan	2003 Inducement Plan
Contractual life (years)	10	10
Plan termination date	Board of Directors Discretion	Board of Directors Discretion
Shares available for grant at December 31, 2013 (in thousands)	11,580	471

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, 2013:

	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, 2012	4,893	$	9.52
Granted	2,085	4.39
Exercised	(96)	4.65
Forfeited or expired	(2,009)	11.69
Outstanding at December 31, 2013	4,873	$	6.52	5.74	$	4,661
Fully vested at December 31, 2013 and expected to vest thereafter	4,834	$	6.54	5.71	$	4,594
Exercisable at December 31, 2013	2,688	$	8.22	2.70	$	926

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

	For the Year Ended December 31,
	2013			2012			2011
Expected life (in years)	6.2			6.0			6.2
Risk-free interest rate	1.7		%	1.0		%	2.4		%
Volatility	60		%	65		%	67		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	2.49		$	2.68		$	4.06

The intrinsic value of options exercised for the years ended December 31, 2013, 2012 and 2011 was $0.1 million, $0.1 million and $0.4 million, respectively. For the years ended December 31, 2013, 2012 and 2011, cash received under all share-based payment arrangements was $0.4 million, $0.2 million and $0.8 million, respectively. The related cash receipts are included in financing activities in the accompanying Consolidated Statements of Cash Flows. Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $4.4 million as of December 31, 2013, which is expected to be recognized over a weighted-average period of approximately 3.4 years beginning January 1, 2013. To the extent that the actual forfeiture rate is different than what we have anticipated, the share-based compensation expense related to these options will be different from our expectations.

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 2007 Plan and the terms of certain share grants provide that for certain grants, when a recipient’s age plus years of service equals or exceeds 75, the recipient will be eligible to voluntarily retire and become fully vested in their applicable restricted shares upon retirement. Consequently, under federal tax law, when a recipient becomes retirement eligible, the employee is immediately taxable on 100% of their applicable restricted shares whether or not the recipient actually retires. Upon the earlier of retirement eligibility or vesting of the applicable restricted shares, the recipient has a tax liability for applicable grants and pursuant to the recipient’s award agreement, a portion of the restricted shares are withheld to satisfy the recipient’s statutory minimum tax withholding obligations. The shares withheld are accounted for as treasury stock at cost, which is determined by the closing stock price per share on the applicable date of vesting or retirement eligibility.

The following table summarizes our restricted share activity for the year ended December 31, 2013:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2012	816		$	5.61
Awards granted	750		4.50
Awards vested	(277	)	6.19
Awards forfeited	(117	)	4.92
Nonvested at December 31, 2013	1,172		$	4.83

Awards vested of 0.3 million, included less than 0.1 million shares for retirement eligible recipients whose applicable restricted shares are treated for accounting and tax purposes as if vested when they meet the retirement eligible date. The fair value of shares vested was $1.4 million, $1.7 million and $2.6 million during 2013, 2012 and 2011, respectively.

Total unrecognized compensation cost, net of a forfeiture estimate, was $4.3 million as of December 31, 2013, which is expected to be recognized over a weighted average period of approximately 3.0 years beginning January 1, 2013. To the extent that the actual forfeiture rate is different than what we have anticipated, the share-based compensation expense related to these awards will be different from our expectations.

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Other Income and Expense Other Income and Expense

12 Months Ended

Dec. 31, 2013

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

5. Other Income and Expense

Other income and expense consists of the following:

	December 31,
	2013			2012			2011
	(In thousands)
Interest income	$	(3,785	)	$	(3,160	)	$	(2,749	)
Foreign currency (gain) loss	(5,626		)	4,185			2,178
Loss on debt retirement, net	12,330			1,199			15,531
Other income, net	(705		)	(1,586		)	(1,030		)
Total other expense, net	$	2,214		$	638		$	13,930

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Earnings Per Share

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Earnings Per Share

7. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common shareholders 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. Unvested share-based compensation awards that contain nonforfeitable rights to dividends or dividend equivalents are considered participating securities and are included in the computation of EPS pursuant to the two-class method. We grant restricted shares which entitle recipients to voting and nonforfeitable dividend rights from the date of grant. As a result, we have applied the two-class method to determine EPS.

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,
	2013			2012			2011
	(In thousands, except per share data)
Net income attributable to Amkor	$	109,296		$	41,818		$	91,808
Income allocated to participating securities	(681		)	(212		)	(332		)
Net income available to Amkor common stockholders	108,615			41,606			91,476
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	93			212			332
Interest on 6.0% convertible notes due 2014, net of tax	9,440			16,103			16,103
Net income attributable to Amkor — diluted	$	118,148		$	57,921		$	107,911
Weighted average shares outstanding — basic	187,032			160,105			190,829
Effect of dilutive securities:
Stock options and restricted share awards	21			241			199
6.0% convertible notes due 2014	48,277			82,658			82,658
Weighted average shares outstanding — diluted	235,330			243,004			273,686
Net income attributable to Amkor per common share:
Basic	$	0.58		$	0.26		$	0.48
Diluted	0.50			0.24			0.39

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,
	2013	2012	2011
	(In thousands)
Stock options and restricted share awards	4,890	4,416	5,070
2.5% convertible notes due 2011	—	—	1,094
6.25% convertible notes due 2013	—	—	695
Total potentially dilutive shares	4,890	4,416	6,859

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Income Taxes (Net operating loss carryforwards) (Details) (USD $)	12 Months Ended						12 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013 United States [Member]	Dec. 31, 2012 United States [Member]	Dec. 31, 2013 State Income Taxes [Member]	Dec. 31, 2012 State Income Taxes [Member]	Dec. 31, 2013 Non-U.S. [Member]	Dec. 31, 2012 Non-U.S. [Member]	Dec. 31, 2011 U.S. [Member]	Dec. 31, 2013 U.S. [Member]	Dec. 31, 2013 KOREA, REPUBLIC OF	Dec. 31, 2013 Minimum [Member] United States [Member]	Dec. 31, 2013 Minimum [Member] State Income Taxes [Member]	Dec. 31, 2013 Minimum [Member] Non-U.S. [Member]	Dec. 31, 2013 Maximum [Member] United States [Member]	Dec. 31, 2013 Maximum [Member] State Income Taxes [Member]	Dec. 31, 2013 Maximum [Member] Non-U.S. [Member]
Loss Carryforwards and other details [Abstract]
Operating loss carryforwards			$ 342,770,000	$ 363,913,000	$ 197,618,000	$ 210,539,000	$ 38,337,000	$ 56,393,000
Operating loss carryforwards, expiration dates												Dec. 31, 2021	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2033	Dec. 31, 2031	Dec. 31, 2022
Tax Credit Carryforward, Amount										8,100,000	15,400,000
Undistributed Earnings of Foreign Subsidiaries		512,400,000
Repatriation Of Earnings Estimated Tax Impact							6,300,000
Repatriation Of Earnings Amount	8,900,000
Tax on repatriated earnings									$ 3,100,000

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Debt (Interest Rates) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 $150 Million Senior Secured Credit Facility [Member]	Dec. 31, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due July 2017 [Member] Tranche A [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due July 2017 [Member] Tranche A [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due July 2017 [Member] Tranche B [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due July 2017 [Member] Tranche B [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Nov. 30, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End				4.29%	4.21%		3.95%		0.00%	4.14%	4.26%	4.18%	4.26%	3.76%		0.00%	3.95%	4.01%
Long-term Debt, Gross	$ 1,646,350,000	$ 1,545,000,000
Percent of fixed rate debt	80.60%	83.80%
Percent of variable rate debt	19.40%	16.20%
Interest rate				2.30%			3.70%	3.80%						1.75%			3.70%
Credit facility, borrowing capacity			$ 150,000,000.0			$ 100,000,000		$ 150,000,000.0							$ 150,000,000.0				$ 100,000,000.0

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Income Taxes (Income tax examination) (Details)	12 Months Ended
	Dec. 31, 2013
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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Exit Activities and Reductions in Force (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 10.5	$ 11.2	$ 8.3
Curtailment and settlement charges		1.0	1.6
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	9.2	7.3	7.7
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 1.3	$ 3.9	$ 0.6

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Income Taxes (Tax holidays) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income Tax Holiday, Termination Date	2022
Income Tax Holiday, Aggregate Dollar Amount	$ 4.8	$ 13.7	$ 5.7
Income Tax Holiday, Tax Benefit, Diluted Earnings Per Share	$ 0.02	$ 0.06	$ 0.02

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Pension and Severance Plans (Defined Benefit Plans - Allocation of plan assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 50,304	$ 58,146	$ 48,801
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,542	1,348
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,173	9,440
Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,950	394
US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,223	9,046
US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,186	1,714
US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,087	8,518
Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,461	36,427
Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		406
Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,374	27,503
Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,840	8,720
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	102	497
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	48,115	51,578
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,542	1,348
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,173	9,440
Fair Value, Inputs, Level 1 [Member] | Foreign Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,950	394
Fair Value, Inputs, Level 1 [Member] | US Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18,223	9,046
Fair Value, Inputs, Level 1 [Member] | US Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,186	1,714
Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	2,070
Fair Value, Inputs, Level 1 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,374	29,979
Fair Value, Inputs, Level 1 [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		406
Fair Value, Inputs, Level 1 [Member] | Foreign Treasury Notes [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,374	27,503
Fair Value, Inputs, Level 1 [Member] | Taiwan Retirement Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,840	8,720
Fair Value, Inputs, Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	377
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,189	6,568
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	2,087	6,448
Fair Value, Inputs, Level 2 [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,087	6,448
Fair Value, Inputs, Level 2 [Member] | Foreign Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
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	$ 102	$ 120

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Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee service share based compensation allocation of recognized period

The following table presents share-based compensation expense attributable to stock options and restricted shares:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Stock options	$	883	$	1,160	$	2,025
Restricted shares	2,088		1,560		2,985
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

The following table presents share-based compensation expense included in the Consolidated Statements of Income:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Selling, general and administrative	$	2,591	$	2,368	$	4,363
Research and development	380		352		647
Total share-based compensation expense	$	2,971	$	2,720	$	5,010

Summary of awards termination dates and shares available for grant

A summary of the stock plans, the respective plan termination dates and shares available for grant as of December 31, 2013, is shown below:

Stock Plans	Amended and Restated 2007 Equity Incentive Plan	2003 Inducement Plan
Contractual life (years)	10	10
Plan termination date	Board of Directors Discretion	Board of Directors Discretion
Shares available for grant at December 31, 2013 (in thousands)	11,580	471

Summary of all common stock option activity

The following table summarizes our stock option activity for the year ended December 31, 2013:

	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, 2012	4,893	$	9.52
Granted	2,085	4.39
Exercised	(96)	4.65
Forfeited or expired	(2,009)	11.69
Outstanding at December 31, 2013	4,873	$	6.52	5.74	$	4,661
Fully vested at December 31, 2013 and expected to vest thereafter	4,834	$	6.54	5.71	$	4,594
Exercisable at December 31, 2013	2,688	$	8.22	2.70	$	926

Assumptions used in valuing the weighted average fair values of the options granted

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

	For the Year Ended December 31,
	2013			2012			2011
Expected life (in years)	6.2			6.0			6.2
Risk-free interest rate	1.7		%	1.0		%	2.4		%
Volatility	60		%	65		%	67		%
Dividend yield	—			—			—
Weighted average grant date fair value per option granted	$	2.49		$	2.68		$	4.06

Restricted share activity

The following table summarizes our restricted share activity for the year ended December 31, 2013:

	Number of Shares (In thousands)		Weighted Average Grant Date Fair Value (Per Share)
Nonvested at December 31, 2012	816		$	5.61
Awards granted	750		4.50
Awards vested	(277	)	6.19
Awards forfeited	(117	)	4.92
Nonvested at December 31, 2013	1,172		$	4.83

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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, 2013	Dec. 31, 2012
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Ownership Percentage	40.00%
Carrying Amount, Assets and Liabilities	$ 16.9	$ 0.2

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Investments

12 Months Ended

Dec. 31, 2013

Investments, All Other Investments [Abstract]

Investments

12. Investments

Investments consist of the following:

	December 31,
	2013				2012
	Carrying Value		Ownership Interest		Carrying Value		Ownership Interest
	(In thousands, except percentages)
Investment in unconsolidated affiliate	$	105,214	60.0	%	$	38,690	30.0	%

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. In April 2013, we completed the exercise of our option to increase our ownership interest in J-Devices from 30% to 60% for an aggregate purchase price of $67.4 million. J-Devices is owned 60% by Amkor, 34% by the former shareholders of NMD and 6% by Toshiba.

At December 31, 2013, our investment includes our 60% equity interest and options to acquire additional equity interests. The remaining options are exercisable at our discretion and permit us to increase our ownership interest in J-Devices up to 66% in 2014 by purchasing shares owned by Toshiba and up to 80% in 2015 and thereafter by purchasing shares owned by the other shareholders. In 2014 and beyond, Toshiba has the option, at its discretion, to sell shares it owns to us. If we decline Toshiba's offer to sell its shares to us, then J-Devices shall have the obligation to purchase the shares. If J-Devices is unable to fulfill its obligation to purchase the shares offered by Toshiba, then we will be obligated to purchase the shares offered by Toshiba. The options in 2014 and 2015 become exercisable in the fourth quarter of such year, 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 upon 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 a basis difference as a result of the cost of our original investment exceeding our proportionate share of J-Devices' equity. The net unamortized basis difference from our original investment was fully amortized as of December 31, 2013. Because our incremental proportionate share of J-Devices' equity exceeded the cost of our additional investment, these adjustments also include the amortization of an additional basis difference. The net unamortized basis difference from our incremental investment was $2.9 million at December 31, 2013.

The following tables present summary financial information of J-Devices:

	For the Year Ended December 31,
	2013		2012		2011
	(In thousands)
Summary income statement information for J-Devices
Net sales	$	825,135	$	531,530	$	576,421
Gross profit	83,778		61,003		82,729
Net income	16,538		20,299		25,412

	December 31,
	2013		2012
	(In thousands)
Summary balance sheet information for J-Devices
Current assets	$	352,628	$	240,759
Non-current assets (including property, plant and equipment)	234,241		201,459
Current liabilities (including debt)	298,401		225,531
Total debt	131,275		144,733
Non-current liabilities (including debt)	108,928		96,612
Total stockholders' equity	179,540		120,075

In conjunction with entering into the joint venture, one of our existing subsidiaries in Japan purchased packaging and test equipment from Toshiba for $44.7 million and leased the equipment to J-Devices under an agreement which was accounted for as a direct financing lease. At the end of the lease in October 2012, J-Devices purchased the remaining equipment for $8.8 million, which was paid in January 2013.

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

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Treasury Stock

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Treasury Stock

17. Treasury Stock

Stock Repurchase Program

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. The purchase of stock under the program may be made in the open market or through privately negotiated transactions. Since inception of the program, we have purchased a total of 45.0 million shares at an aggregate purchase price of $208.4 million, net of $0.9 million of commissions. 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, price, applicable legal requirements and other factors. Our stock repurchase program has been and is expected to be funded with available cash and may be suspended or discontinued at any time. All shares repurchased are recorded as treasury stock at cost.

During the year ended December 31, 2013, we made no purchases under the stock repurchase program. During the year ended December 31, 2012, we purchased 16.5 million shares of common stock for an aggregate purchase price of $79.5 million, net of $0.3 million of commissions, for an average price of $4.83. At December 31, 2013, approximately $91.6 million was available to repurchase common stock pursuant to the stock repurchase program. At December 31, 2013 and 2012, there were no unsettled shares.

Shares for Tax Withholding

We withheld 0.1 million shares for each of the years ended December 31, 2013 and 2012, from restricted shares that vested during the respective period to satisfy tax withholding obligations. Minimum tax withholding obligations that arose on the vesting of restricted shares were $0.5 million and $0.6 million for the years ended December 31, 2013 and 2012, respectively. These shares are reflected as treasury stock at cost.

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Treasury Stock (Details) (USD $)	12 Months Ended								29 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Treasury Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2013 Stock Repurchase Program [Member]	Dec. 31, 2012 Stock Repurchase Program [Member]	Dec. 31, 2013 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount									$ 300,000,000
Repurchase of common stock, number of shares					16,472,000	28,573,000	0	16,500,000	45,000,000
Treasury Stock, Value, Acquired, Cost Method		79,814,000	129,500,000		79,814,000	129,500,000		79,500,000	208,400,000
Commission incurred								300,000	900,000
Average cost per share (in dollars per share)								$ 4.83
Remaining authorized repurchase amount							91,600,000
Other accrued liabilities, current							0	0	0
Treasury stock acquired through surrender of shares for tax withholding, shares				95,000	109,000	111,000
Adjustments Related to Tax Withholding for Share-based Compensation	$ 466,000	$ 609,000	$ 776,000	$ 466,000	$ 609,000	$ 776,000

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Business Segments (Tables)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

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,
	2013		2012		2011
	(In thousands)
Advanced products	$	1,451,664	$	1,302,145	$	1,124,701
Mainstream products	1,504,786		1,457,401		1,651,658
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

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,
	2013		2012		2011
	(In thousands)
Japan	$	394,834	$	349,360	$	340,302
Singapore	496,601		452,737		539,467
Thailand	116,376		139,134		111,748
Other foreign countries	743,425		675,365		697,229
Total foreign countries	1,751,236		1,616,596		1,688,746
United States	1,205,214		1,142,950		1,087,613
Total net sales	$	2,956,450	$	2,759,546	$	2,776,359

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,
	2013		2012
	(In thousands)
China	$	524,967	$	409,822
Japan	10,799		17,545
Korea	916,777		907,844
Malaysia	61,080		—
Philippines	240,187		211,323
Taiwan	236,178		233,114
Other foreign countries	93		77
Total foreign countries	1,990,081		1,779,725
United States	16,472		40,244
Total property, plant and equipment, net	$	2,006,553	$	1,819,969

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of acquired intangibles

Intangibles as of December 31, 2013, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	21,929	$	(18,740	)	$	3,189
Customer relationships	8,000		(8,000		)	—
Total intangibles	$	29,929	$	(26,740	)	$	3,189

Intangibles as of December 31, 2012, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	22,169	$	(19,636	)	$	2,533
Customer relationships	8,000		(5,767		)	2,233
Total intangibles	$	30,169	$	(25,403	)	$	4,766

Estimated future amortization of intangible assets

Based on the amortizing assets recognized in our balance sheet at December 31, 2013, amortization for each of the next five years is estimated as follows:

	Amortization
	(In thousands)
2014	$	1,028
2015	736
2016	521
2017	488
2018	275
Thereafter	141
Total amortization	$	3,189

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 610,442	$ 413,048
Restricted cash	2,681	2,680
Accounts receivable:
Trade, net of allowances	382,037	389,699
Other	3,505	13,098
Inventories	200,423	227,439
Other current assets	33,328	45,444
Total current assets	1,232,416	1,091,408
Property, plant and equipment, net	2,006,553	1,819,969
Intangibles, net	3,189	4,766
Investments	105,214	38,690
Restricted cash	2,234	2,308
Other assets	77,692	68,074
Total assets	3,427,298	3,025,215
Current liabilities:
Short-term borrowings and current portion of long-term debt	61,350	0
Trade accounts payable	365,334	439,663
Accrued expenses	264,252	212,964
Total current liabilities	690,936	652,627
Long-term debt	1,516,390	1,320,000
Long-term debt, related party	75,000	225,000
Pension and severance obligations	165,073	139,379
Other non-current liabilities	14,959	21,415
Total liabilities	2,462,358	2,358,421
Commitments and contingencies (Note 19)
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, 262,109 and 197,709 shares issued, and 216,702 and 152,397 shares outstanding, in 2013 and 2012, respectively	262	198
Additional paid-in capital	1,812,530	1,614,143
Accumulated deficit	(647,348)	(756,644)
Accumulated other comprehensive (loss) income	(255)	11,241
Treasury stock, at cost, 45,407 and 45,312 shares in 2013 and 2012, respectively	(211,449)	(210,983)
Total Amkor stockholders’ equity	953,740	657,955
Noncontrolling interests in subsidiaries	11,200	8,839
Total equity	964,940	666,794
Total liabilities and equity	$ 3,427,298	$ 3,025,215

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Pension and Severance Plans (Korean Severance Plan) (Details) (Korean Severance Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Korean Severance Plan [Member]
Deferred Compensation Liability, Current and Noncurrent [Roll Forward]
Balance	$ 126,762	$ 106,715		$ 88,899
Provision of severance benefits	26,550	19,667	26,705
Severance payments	(10,402)	(8,520)	(6,717)
Loss (gain) on foreign currency	2,463	8,900	(2,172)
Balance	145,373	126,762	106,715	88,899
Payments remaining with the National Pension Fund	(241)	(249)	(239)
Total severance obligation balance at end of year	145,132	126,513	106,476
Less current portion of accrued severance obligation (Note 13)	11,197	9,516	7,476
Non-current portion of severance obligation	$ 133,935	$ 116,997	$ 99,000

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Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

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 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, Taiwan and the United States (“U.S.”).

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). 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. Actual results could differ materially from those estimates and assumptions.

Beginning with the year ended December 31, 2013, we reclassified equity in earnings of unconsolidated affiliate from other expense (income) to below income tax expense in our Consolidated Statements of Income for all periods presented. The income tax note (Note 6) was revised accordingly. The revision had no impact on net income.

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, 2013, the combined book value of the assets and liabilities associated with these Philippine realty corporations included in our Consolidated Balance Sheet was $16.9 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, 2013, 2012 or 2011. 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 in China, Korea, Malaysia, the Philippines, Singapore and Taiwan, 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 subsidiaries in Japan. The asset and liability amounts of these subsidiaries 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 asset and liability 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 exchange gains or losses are included in other expense (income) in the period in which they occur.

Concentrations and Credit Risk

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. 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, 2013, 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

Our future results of operations involve a number of risks and uncertainties. Factors that could affect our business or future results and cause actual results to vary materially from historical results include, but are not limited to, dependence on the highly cyclical semiconductor industry, fluctuations in operating results and cash flows, absence of significant backlog in our business, high fixed costs, failure to meet guidance, declining average selling prices, decisions by our integrated device manufacturer customers to curtail outsourcing, our substantial indebtedness, our ability to fund liquidity needs, restrictive covenants contained in the agreements governing our indebtedness, significant severance plan obligations, failure to maintain an effective system of internal controls, product return and liability risks including warranty claims, dependence on international operations and sales, continuing development and implementation of changes to our management information systems, attracting and retaining qualified employees, difficulties consolidating and integrating our operations, dependence on materials and equipment suppliers, customer concentration and loss of customers, the need for significant capital expenditures, impairment charges, litigation incident to our business, adverse tax consequences, the development of new proprietary technology and the enforcement of intellectual property rights by or against us, complexity of packaging and test processes, competition, our need to comply with existing and future environmental, health and safety laws and initiatives, natural disasters and other calamities and continued control by existing stockholders.

We believe that our cash flows from operating activities together with existing cash and cash equivalents will be sufficient to fund our working capital, capital expenditure and debt service requirements for at least the next twelve months. Thereafter, our liquidity will continue to be affected by, among other things, volatility in the global economy and credit markets, the performance of our business, our capital expenditure levels and our ability to either repay debt out of operating cash flows or refinance debt at or prior to maturity with the proceeds of debt or equity financings.

We are subject to certain legal proceedings, lawsuits and other claims, as discussed in Note 19. 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.

Intangibles

Finite-lived intangible assets include customer relationship and supply agreements as well as patents and technology rights and are amortized on a straight-line basis over their estimated useful lives, generally for periods ranging from 3 to 10 years. We continually evaluate the reasonableness of the useful lives of these assets. Finite-lived intangibles are tested for recoverability whenever events or changes in circumstances indicate the carrying amounts may not be recoverable. An impairment loss, if any, would be measured as the excess of the carrying value over the fair value determined by discounted future cash flows.

Investments

We have a 60% ownership interest in J-Devices, a joint venture to provide semiconductor packaging and test services in Japan. See Note 12 for additional information. Our investment 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.

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 uncertain income tax positions, deferred revenue, employee-related liabilities, deposits and deferred tax liabilities.

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. See Note 4 and Note 17 for more information.

Fair Value Measurements

We apply fair value accounting for all financial 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 18 for further discussion of fair value measurements.

Revenue Recognition

We recognize revenue from our packaging and test services 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.

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, 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 6 for more information regarding unrecognized income tax benefits.

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Share-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 2007 Plan [Member] Y	Jan. 02, 2008 2007 Plan [Member]	Dec. 31, 2013 2003 Plan [Member]	Sep. 09, 2003 2003 Plan [Member]	Dec. 31, 2013 1998 Plan [Member] Minimum [Member]	Dec. 31, 2013 1998 Plan [Member] Maximum [Member]	Dec. 31, 2013 Employee stock option [Member]	Dec. 31, 2013 Restricted shares [Member]	Dec. 31, 2012 Restricted shares [Member]	Dec. 31, 2011 Restricted shares [Member]	Dec. 31, 2013 Restricted shares [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)							17,000,000		300,000
Award vesting period				2 years	5 years					2 years	5 years		4 years
Number of shares available for grant (in shares)						11,580,000		471,000
Weighted Average Exercise Price Per Share average contractual term (years)	5 years 8 months 27 days					10 years		10 years
Contractual term	10 years
Intrinsic value of options exercised	$ 100,000	$ 100,000	$ 400,000
Cash received for stock option exercises	446,000	182,000	821,000
Unrecognized compensation expense from Restricted Stock												4,400,000	4,300,000
Weighted-average period of recognition of unrecognized compensation expense												3 years 4 months 24 days	3 years
Restricted shares vesting percentage	25.00%
Minimum retirement threshold						75
Taxable to employee upon retirement eligibility						100.00%
Vested in period (in shares)													277,000
Number of shares vested for retirement eligible recipients (in shares)																100,000
Fair value of shares upon vesting													$ 1,400,000	$ 1,700,000	$ 2,600,000

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Debt (Long Term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,646,350,000	$ 1,545,000,000
Debt Instrument, Unamortized Premium	6,390,000	0
Less: Short-term borrowings and current portion of long-term debt	(61,350,000)	0
Long-term debt (including related party)	1,591,390,000	1,545,000,000
Revolving Credit Facility Due April 2015 [Member] | Taiwan Subsidiaries [Member]
Debt Instrument [Line Items]
Borrowing under senior secured credit facility	0	0
Senior Notes Due May 2018 [Member]
Debt Instrument [Line Items]
Senior notes	345,000,000	345,000,000
Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes	400,000,000	400,000,000
Senior Notes Due October 2022 [Member]
Debt Instrument [Line Items]
Senior notes	525,000,000	300,000,000
Convertible Senior Subordinated Notes Due April 2014 [Member]
Debt Instrument [Line Items]
Convertible subordinated notes	56,350,000	250,000,000
Term Loan Due March 2015 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Term Loan for subsidiaries	80,000,000	100,000,000
Term Loan Due June 2016 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Term Loan for subsidiaries	70,000,000	0
Term Loan Due July 2017 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Term Loan for subsidiaries	90,000,000	137,000,000
Term Loan Due September 2017 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Term Loan for subsidiaries	10,000,000	0
Term Loan Due December 2019 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Term Loan for subsidiaries	70,000,000	13,000,000
Revolving credit facility 2.00% due June 2016 [Member] | Korea Subsidiaries [Member]
Debt Instrument [Line Items]
Borrowing under senior secured credit facility	0	0
$150 Million Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing under senior secured credit facility	$ 0	$ 0

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Accounts Receivable, Trade (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable, Trade [Abstract]
Accounts receivable	$ 389,157	$ 391,969
Allowance for sales credits	(7,044)	(2,255)
Allowance for doubtful accounts	(76)	(15)
Total accounts receivable trade, net of allowances	$ 382,037	$ 389,699

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Fair Value Measurements

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

18. 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.

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.

We also measure certain assets and liabilities, including property, plant and equipment, intangible assets and our investment in J-Devices, at fair value on a nonrecurring basis. For the year ended December 31, 2013, such measurements included the consideration of third party valuation reports based on a combination of market and cost approach valuation techniques. The valuation reports contained various inputs including semiconductor industry data, replacement costs, price lists and general information regarding the assets being evaluated. Nonrecurring fair value measurements related to property, plant and equipment impairments reflect the fair value of the assets at the dates the impairments were taken during the period.

Our fair value measurements consist of the following:

	December 31,
	2013		2012
	(In thousands)
Recurring fair value measurements:
Cash equivalent money market funds (Level 1)	$	300,352	$	151,066
Restricted cash money market funds (Level 1)	2,681		2,680
Nonrecurring fair value measurements:
Long-lived assets held for use or disposal (Level 3)	$	1,055	$	868

	Year Ended December 31,
	2013		2012		2011
	(In thousands)
Nonrecurring fair value measurements:
Losses on long-lived assets held for use or disposal (Level 3)	$	1,529	$	763	$	3,336

In 2013, $0.8 million of impairment losses were recorded in research and development expense, and $0.7 million were recorded in cost of sales. In 2012 and 2011, all impairment losses on property, plant and equipment were recorded in cost of sales.

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

	December 31, 2013				December 31, 2012
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,321,443	$	1,276,390	$	1,061,945	$	1,045,000
Convertible senior subordinated notes (Level 1)	102,585		56,350		371,975		250,000
Term loans (Level 2)	320,000		320,000		269,200		250,000
Total debt	$	1,744,028	$	1,652,740	$	1,703,120	$	1,545,000

The estimated fair value of the debt is based primarily on quoted market prices reported on or near the respective balance sheet dates for our senior and convertible senior subordinated notes. The estimated fair value of the debt of our subsidiaries 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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Intangible Assets (Acquired) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets, Net [Abstract]
Gross	$ 29,929	$ 30,169
Accumulated Amortization	(26,740)	(25,403)
Net	3,189	4,766
Patents and technology rights [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	21,929	22,169
Accumulated Amortization	(18,740)	(19,636)
Net	3,189	2,533
Customer relationships [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross	8,000	8,000
Accumulated Amortization	(8,000)	(5,767)
Net	$ 0	$ 2,233

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Accounts Receivable, Trade (Tables)

12 Months Ended

Dec. 31, 2013

Accounts Receivable, Trade [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable, trade consist of the following:

	December 31,
	2013			2012
	(In thousands)
Accounts receivable	$	389,157		$	391,969
Allowance for sales credits	(7,044		)	(2,255		)
Allowance for doubtful accounts	(76		)	(15		)
Total accounts receivable trade, net of allowances	$	382,037		$	389,699

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Intangible Assets

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

11. Intangibles

Intangibles as of December 31, 2013, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	21,929	$	(18,740	)	$	3,189
Customer relationships	8,000		(8,000		)	—
Total intangibles	$	29,929	$	(26,740	)	$	3,189

Intangibles as of December 31, 2012, consist of the following:

	Gross		Accumulated Amortization			Net
	(In thousands)
Patents and technology rights	$	22,169	$	(19,636	)	$	2,533
Customer relationships	8,000		(5,767		)	2,233
Total intangibles	$	30,169	$	(25,403	)	$	4,766

Amortization of identifiable intangible assets was $3.6 million, $3.9 million and $5.2 million in 2013, 2012 and 2011, respectively. Based on the amortizing assets recognized in our balance sheet at December 31, 2013, amortization for each of the next five years is estimated as follows:

	Amortization
	(In thousands)
2014	$	1,028
2015	736
2016	521
2017	488
2018	275
Thereafter	141
Total amortization	$	3,189

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Exit Activities and Reductions in Force (Restructuring Reserve) (Details) (Employee Separation Costs [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Separation Costs [Member]
Restructuring Reserve [Roll Forward]
Accrual, Beginning of year	$ 1,607	$ 0	$ 670
Charges	10,506	11,211	8,326
Cash Payments	(12,531)	(8,682)	(7,416)
Restructuring Reserve, Translation and Other Adjustment	418	(922)	(1,580)
End of year	$ 0	$ 1,607	$ 0