Amkor Technology (AMKR) 10-Q 30 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2015	Oct. 23, 2015
Document Information [Line Items]
Entity Registrant Name	AMKOR TECHNOLOGY, INC.
Entity Central Index Key	1,047,127
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		237,363,257

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net sales	$ 734,362	$ 812,824	$ 2,213,959	$ 2,276,327
Cost of sales	607,762	659,607	1,837,314	1,843,576
Gross profit	126,600	153,217	376,645	432,751
Selling, general and administrative	54,232	61,600	173,609	191,698
Research and development	21,073	16,437	59,119	59,561
Total operating expenses	75,305	78,037	232,728	251,259
Operating income	51,295	75,180	143,917	181,492
Interest expense	17,695	23,780	64,317	70,039
Interest expense, related party	1,243	1,243	3,727	3,727
Other (income) expense, net	(11,576)	(9,626)	(4,784)	(15,289)
Total other expense, net	7,362	15,397	63,260	58,477
Income before taxes and equity in earnings of unconsolidated affiliate	43,933	59,783	80,657	123,015
Income tax expense	16,568	14,985	27,198	32,425
Income before equity in earnings of unconsolidated affiliate	27,365	44,798	53,459	90,590
Equity in earnings of J-Devices	1,656	3,372	15,460	29,169
Net income	29,021	48,170	68,919	119,759
Net income attributable to noncontrolling interests	(847)	(1,073)	(2,386)	(2,508)
Net income attributable to Amkor	$ 28,174	$ 47,097	$ 66,533	$ 117,251
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.12	$ 0.20	$ 0.28	$ 0.51
Diluted (in dollars per share)	$ 0.12	$ 0.20	$ 0.28	$ 0.50
Shares used in computing per common share amounts:
Basic (in shares)	236,888	236,337	236,813	228,733
Diluted (in shares)	236,974	237,509	237,168	236,672

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income	$ 29,021	$ 48,170	$ 68,919	$ 119,759
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans, net of tax	22	16	66	622
Foreign currency translation adjustment	10	(98)	(102)	(11,906)
Equity interest in J-Devices' other comprehensive income (loss), net of tax	4,587	(9,645)	537	(5,939)
Total other comprehensive income (loss)	4,619	(9,727)	501	(17,223)
Comprehensive income	33,640	38,443	69,420	102,536
Comprehensive income attributable to noncontrolling interests	(847)	(1,073)	(2,386)	(2,508)
Comprehensive income attributable to Amkor	$ 32,793	$ 37,370	$ 67,034	$ 100,028

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 430,444	$ 449,946
Restricted cash	2,000	2,681
Accounts receivable, net of allowances	410,256	469,683
Inventories	208,213	223,379
Other current assets	53,858	52,259
Total current assets	1,104,771	1,197,948
Property, plant and equipment, net	2,284,901	2,206,476
Investments	146,639	117,733
Restricted cash	2,163	2,123
Other assets	109,014	111,125
Total assets	3,647,488	3,635,405
Current liabilities:
Short-term borrowings and current portion of long-term debt	0	5,000
Trade accounts payable	279,260	309,025
Capital expenditures payable	221,281	127,568
Accrued expenses	251,650	258,997
Total current liabilities	752,191	700,590
Long-term debt	1,365,376	1,450,824
Long-term debt, related party	75,000	75,000
Pension and severance obligations	149,952	152,673
Other non-current liabilities	101,564	125,382
Total liabilities	$ 2,444,083	$ 2,504,469
Commitments and contingencies (Note 17)
Amkor stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	$ 0	$ 0
Common stock, $0.001 par value, 500,000 shares authorized, 282,597 and 282,231 shares issued, and 236,906 and 236,627 shares outstanding, in 2015 and 2014, respectively	283	282
Additional paid-in capital	1,882,529	1,878,810
Accumulated deficit	(450,429)	(516,962)
Accumulated other comprehensive loss	(32,366)	(32,867)
Treasury stock, at cost, 45,691 and 45,604 shares in 2015 and 2014, respectively	(213,576)	(213,028)
Total Amkor stockholders’ equity	1,186,441	1,116,235
Noncontrolling interests in subsidiaries	16,964	14,701
Total equity	1,203,405	1,130,936
Total liabilities and equity	$ 3,647,488	$ 3,635,405

Consolidated Balance Sheets (U5

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares shares in Thousands	Sep. 30, 2015	Dec. 31, 2014
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	10,000	10,000
Preferred stock designated Series A, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000	500,000
Common stock, shares issued	282,597	282,231
Common stock, shares outstanding	236,906	236,627
Treasury stock, shares	45,691	45,604

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 68,919	$ 119,759
Depreciation and amortization	371,968	340,089
Loss on debt retirement	2,530	0
Gain on sale of subsidiary to J-Devices	0	9,155
Other operating activities and non-cash items	(14,752)	(27,811)
Changes in assets and liabilities	(5,299)	(17,214)
Net cash provided by operating activities	423,366	405,668
Cash flows from investing activities:
Payments for property, plant and equipment	(352,644)	(442,308)
Proceeds from sale of property, plant and equipment	5,212	2,170
Cash received (transferred) on sale of subsidiary to J-Devices, net	8,355	(15,774)
Investment in J-Devices	(12,908)	0
Purchase of short-term investment	0	20,000
Proceeds from short-term investment	0	20,000
Other investing activities	(869)	(389)
Net cash used in investing activities	(352,854)	(456,301)
Cash flows from financing activities:
Borrowings under revolving credit facilities	180,000	0
Payments under revolving credit facilities	(100,000)	0
Proceeds from issuance of long-term debt	360,000	80,000
Payments of long-term debt	(530,000)	(140,000)
Payment of deferred consideration for an acquisition	0	(18,763)
Proceeds from the issuance of stock through share-based compensation plans	657	5,826
Payments of tax withholding for restricted shares	(548)	(1,348)
Payments of subsidiary dividends to noncontrolling interests	(123)	0
Net cash used in financing activities	(90,014)	(74,285)
Effect of exchange rate fluctuations on cash and cash equivalents	0	68
Net decrease in cash and cash equivalents	(19,502)	(124,850)
Cash and cash equivalents, beginning of period	449,946	610,442
Cash and cash equivalents, end of period	430,444	485,592
Non cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	221,281	295,027
Common stock issuance for conversion and exchange in 2014 of 6.0% Convertible senior subordinated notes due April 2014	$ 0	$ 56,350

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows Condensed Consolidated Statements of Cash Flows (Parenthetical)	Sep. 30, 2015	Sep. 30, 2014
Convertible Senior Subordinated Notes Due April 2014 [Member]
Non cash investing and financing activities:
Interest rate on convertible senior subordinated notes due April 2014	0.00%	6.00%

Interim Financial Statements

Interim Financial Statements	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Financial Statements	1. Interim Financial Statements Basis of Presentation. The Consolidated Financial Statements and related disclosures as of September 30, 2015 , and for the three and nine months ended September 30, 2015 and 2014 , are unaudited, pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). The December 31, 2014 , Consolidated Balance Sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S.”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. In our opinion, these financial statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods. These financial statements should be read in conjunction with the financial statements included in our Annual Report for the year ended December 31, 2014 , filed on Form 10-K with the SEC on February 19, 2015. The results of operations for the three and nine months ended September 30, 2015 , are not necessarily indicative of the results to be expected for the full year. Unless the context otherwise requires, all references to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and our subsidiaries. Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments.

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	2. New Accounting Standards Recently Issued Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU 2014-09 is based on the principle that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers, including significant judgments and changes in judgments. ASU 2014-09 permits the use of either full retrospective or modified retrospective methods of adoption. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , which defers the effective date by one year to December 15, 2017, for interim and annual reporting periods beginning after that date . Early adoption is permitted, but not before the original effective date of December 15, 2016. We are currently evaluating the method of adoption and the impact that this guidance will have on our financial statements and disclosure. In April 2015, the FASB issued ASU 2015-03, Interest-Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs . ASU 2015-03 requires debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB issued ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements - Amendments to SEC Paragraphs Pursuant to Staff Announcement at June 18, 2015 EITF Meeting (SEC Update) , which clarifies that companies may continue to present unamortized debt issuance costs associated with line of credit arrangements as an asset. ASU 2015-03 and ASU 2015-15 are effective for interim and annual reporting periods beginning after December 15, 2015, and require retrospective application. Early adoption is permitted. ASU 2015-03 and ASU 2015-15 are not expected to have a significant impact on our financial statements and disclosure. In April 2015, the FASB issued ASU 2015-05, Intangibles - Goodwill and Other Internal-Use Software (Subtopic 350-40) - Customer's Accounting for Fees Paid in a Cloud Computing Arrangement . ASU 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The new guidance does not change the accounting for a customer's accounting for service contracts. ASU No. 2015-05 is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-05 is not expected to have a significant impact on our financial statements and disclosure. In July 2015, the FASB issued ASU 2015-11, Inventory - Simplifying the Measurement of Inventory (Topic 330) . ASU 2015-11 requires inventory to be subsequently measured using the lower of cost and net realizable value, thereby eliminating the market value approach. Net realizable value is defined as the “estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation.” ASU 2015-11 is effective for reporting periods beginning after December 15, 2016 and is applied prospectively. Early adoption is permitted. We are currently evaluating the impact that this guidance will have on our financial statements and disclosure. In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805) - Simplifying the Accounting for Measurement-Period Adjustments . ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are identified, including the cumulative effect of the change in provisional amount as if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for reporting periods beginning after December 15, 2015 and is applied prospectively. Early adoption is permitted. ASU 2015-16 may affect our financial statements to the extent we have business combinations in the future.

Sale of Subsidiary to J-Devices

Sale of Subsidiary to J-Devices	9 Months Ended
	Sep. 30, 2015
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Sale of Subsidiary to J-Devices	3. Sale of Subsidiary to J-Devices On June 30, 2014, we sold 100% of the shares of our wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan to J-Devices Corporation ("J-Devices"), our equity-method joint venture in Japan, for ¥1.1 billion . For additional information regarding our investment in J-Devices, we refer you to Note 12 . We received ¥0.1 billion ( $1.0 million ) in cash from J-Devices at closing and received the remaining ¥1.0 billion ( $8.4 million ) on June 30, 2015. We recognized a net gain on the sale of $9.2 million in our consolidated financial statements in other (income) expense, net, which includes a gain of $12.6 million from the release of accumulated foreign currency translation adjustments associated with the entity ( Note 8 ). J-Devices recognized a gain of $14.7 million on the transaction in its consolidated financial statements as the fair value of the net assets acquired exceeded the purchase price. The gain recognized by J-Devices increased our equity in earnings of J-Devices by $8.8 million . The combined net gain we recognized was $18.0 million .

Share-Based Compensation Plans

Share-Based Compensation Plans	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation Plans	4. Share-Based Compensation Plans For the three and nine months ended September 30, 2015 , we recognized share-based compensation attributable to stock options and restricted shares of $0.8 million and $3.1 million , respectively. For the three and nine months ended September 30, 2014 , we recognized share-based compensation attributable to stock options and restricted shares of $0.9 million and $2.8 million , respectively. For the three and nine months ended September 30, 2015 and 2014 , we recognized these costs primarily in selling, general and administrative expenses. There were no corresponding deferred income tax benefits for stock options or restricted shares. Stock Options The following table summarizes our stock option activity for the nine months ended September 30, 2015 : 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, 2014 3,822 $ 6.25 Granted 315 7.12 Exercised (141 ) 4.70 Forfeited or expired (207 ) 5.20 Outstanding at September 30, 2015 3,789 $ 6.44 6.12 $ 206 Fully vested at September 30, 2015 and expected to vest thereafter 3,768 $ 6.44 6.11 $ 204 Exercisable at September 30, 2015 2,546 $ 6.95 5.04 $ 103 The following assumptions were used to calculate the weighted average fair values of the options granted: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 Expected life (in years) 6.0 6.1 5.8 6.1 Risk-free interest rate 1.8 % 2.0 % 1.8 % 2.0 % Volatility 44 % 56 % 45 % 57 % Dividend yield — — — — Weighted average grant date fair value per option granted $ 2.33 $ 5.43 $ 3.20 $ 4.46 Total unrecognized compensation expense from stock options, net of a forfeiture estimate, was $3.1 million as of September 30, 2015 , which is expected to be recognized over a weighted-average period of approximately 2.0 years beginning October 1, 2015 . Restricted Shares The following table summarizes our restricted share activity for the nine months ended September 30, 2015 : Number of Shares (In thousands) Weighted Average Grant-Date Fair Value (Per share) Nonvested at December 31, 2014 660 $ 4.58 Awards granted 49 7.30 Awards vested (227 ) 4.87 Awards forfeited (25 ) 4.47 Nonvested at September 30, 2015 457 $ 4.73 Total unrecognized compensation cost from restricted shares, net of a forfeiture estimate, was $1.8 million as of September 30, 2015 , which is expected to be recognized over a weighted average period of approximately 1.4 years beginning October 1, 2015 .

Other Income and Expense

Other Income and Expense	9 Months Ended
	Sep. 30, 2015
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: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Interest income $ (523 ) $ (920 ) $ (2,196 ) $ (2,462 ) Foreign currency gain, net (8,499 ) (7,928 ) (9,751 ) (3,381 ) Loss on debt retirement — — 9,560 757 Gain on sale of subsidiary to J-Devices (Note 3) — — — (9,155 ) Other income, net (2,554 ) (778 ) (2,397 ) (1,048 ) Total other (income) expense, net $ (11,576 ) $ (9,626 ) $ (4,784 ) $ (15,289 )

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes Our income tax expense of $27.2 million for the nine months ended September 30, 2015 primarily reflects income taxes at certain of our foreign operations and foreign withholding taxes. Our income tax expense also reflects income taxed in foreign jurisdictions where we benefit from tax holidays. We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets in the jurisdiction from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and results of recent operations. For most of our foreign deferred tax assets, we consider it more likely than not that we will have sufficient taxable income to allow us to realize these deferred tax assets. However, in the event taxable income falls short of current expectations, we may need to establish a valuation allowance against such deferred tax assets. We have valuation allowances on select deferred tax assets in certain foreign jurisdictions. We also maintain a valuation allowance on all of our U.S. net deferred tax assets, including our net operating loss carryforwards. Such valuation allowances are released as the related tax benefits are realized or when sufficient evidence exists to conclude that it is more likely than not that the deferred tax assets will be realized. Unrecognized tax benefits represent reserves for potential tax deficiencies or reductions in tax benefits that could result from federal, state or foreign tax audits. Our gross unrecognized tax benefits decreased from $12.7 million at December 31, 2014 , to $10.4 million at September 30, 2015 , primarily due to a change in filing position. At September 30, 2015 , all of our unrecognized tax benefits would reduce our effective tax rate, if recognized. Our unrecognized tax benefits are subject to change as examinations of tax years are completed. Tax return examinations involve uncertainties, and there can be no assurances that the outcome of examinations will be favorable.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2015
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 stockholders by the weighted average number of common shares outstanding during the period. The weighted average number of common shares outstanding includes restricted shares held by retirement eligible recipients and is reduced for treasury stock. 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 Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands, except per share data) Net income attributable to Amkor $ 28,174 $ 47,097 $ 66,533 $ 117,251 Income allocated to participating securities — (149 ) (102 ) (383 ) Net income available to Amkor common stockholders — basic 28,174 46,948 66,431 116,868 Adjustment for dilutive securities on net income: Net income reallocated to participating securities — — — 9 Interest on 6.0% convertible notes due 2014, net of tax — — — 1,039 Net income attributable to Amkor — diluted $ 28,174 $ 46,948 $ 66,431 $ 117,916 Weighted average shares outstanding — basic 236,888 236,337 236,813 228,733 Effect of dilutive securities: Stock options and restricted share awards 86 1,172 355 841 6.0% convertible notes due 2014 — — — 7,098 Weighted average shares outstanding — diluted 236,974 237,509 237,168 236,672 Net income attributable to Amkor per common share: Basic $ 0.12 $ 0.20 $ 0.28 $ 0.51 Diluted 0.12 0.20 0.28 0.50 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 Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Stock options and restricted share awards 3,477 1,139 1,861 1,344

Equity and Accumulated Other Co

Equity and Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Equity and Accumulated Other Comprehensive Income	8. Equity and Accumulated Other Comprehensive Income (Loss) The following tables reflect the changes in equity attributable to both Amkor and the noncontrolling interests: Attributable to Amkor Attributable to Noncontrolling Interests Total (In thousands) Equity at December 31, 2014 $ 1,116,235 $ 14,701 $ 1,130,936 Net income 66,533 2,386 68,919 Other comprehensive income 501 — 501 Issuance of stock through employee share-based compensation plans 657 — 657 Treasury stock acquired through surrender of shares for tax withholding (548 ) — (548 ) Share-based compensation 3,063 — 3,063 Subsidiary dividends paid to noncontrolling interests — (123 ) (123 ) Equity at September 30, 2015 $ 1,186,441 $ 16,964 $ 1,203,405 Attributable to Amkor Attributable to Noncontrolling Interests Total (In thousands) Equity at December 31, 2013 $ 953,740 $ 11,200 $ 964,940 Net income 117,251 2,508 119,759 Other comprehensive loss (17,223 ) — (17,223 ) Issuance of stock through employee share-based compensation plans 5,826 — 5,826 Treasury stock acquired through surrender of shares for tax withholding (1,348 ) — (1,348 ) Share-based compensation 2,766 — 2,766 Conversion of debt to common stock 56,350 — 56,350 Equity at September 30, 2014 $ 1,117,362 $ 13,708 $ 1,131,070 The following tables reflect the changes in accumulated other comprehensive income (loss), net of tax: Defined Benefit Pension Foreign Currency Translation Equity Interest in J-Devices' Other Comprehensive Income (Loss) Total (In thousands) Accumulated other comprehensive loss at $ (2,525 ) $ (513 ) $ (29,829 ) $ (32,867 ) Other comprehensive (loss) income before reclassifications — (102 ) 537 435 Amounts reclassified from accumulated other comprehensive loss 66 — — 66 Other comprehensive income (loss) 66 (102 ) 537 501 Accumulated other comprehensive loss at $ (2,459 ) $ (615 ) $ (29,292 ) $ (32,366 ) Defined Benefit Pension Foreign Currency Translation Equity Interest in J-Devices' Other Comprehensive Income (Loss) Total (In thousands) Accumulated other comprehensive (loss) income at $ (1,013 ) $ 11,451 $ (10,693 ) $ (255 ) Other comprehensive income (loss) before reclassifications — 681 (5,939 ) (5,258 ) Amounts reclassified from accumulated other comprehensive (loss) income 622 (12,587 ) — (11,965 ) Other comprehensive income (loss) 622 (11,906 ) (5,939 ) (17,223 ) Accumulated other comprehensive loss at $ (391 ) $ (455 ) $ (16,632 ) $ (17,478 ) Amounts reclassified out of accumulated other comprehensive (loss) income are included as a component of net periodic pension cost ( Note 15 ) or other (income) expense, net as a result of the release of accumulated foreign currency translation adjustments associated with the sale of our subsidiary in Japan ( Note 3 ).

Factoring of Accounts Receivabl

Factoring of Accounts Receivable	9 Months Ended
	Sep. 30, 2015
Factoring of Accounts Receivable [Abstract]
Factoring of Accounts Receivable [Table Text Block]	9. Factoring of Accounts Receivable In certain foreign locations, we use non-recourse factoring arrangements with third party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the three and nine months ended September 30, 2015 , we sold accounts receivable totaling $82.4 million and $235.3 million , respectively, for a discount, plus fees, of $0.3 million and $1.1 million , respectively. For the three and nine months ended September 30, 2014 , we sold accounts receivable totaling $102.0 million and $226.8 million , respectively, for a discount, plus fees, of $0.4 million and $1.0 million , respectively.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	10. Inventories Inventories consist of the following: September 30, December 31, 2014 (In thousands) Raw materials and purchased components $ 150,736 $ 161,942 Work-in-process 57,477 61,437 Total inventories $ 208,213 $ 223,379

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment	11. Property, Plant and Equipment Property, plant and equipment consist of the following: September 30, December 31, 2014 (In thousands) Land $ 207,985 $ 207,985 Land use rights 26,845 26,845 Buildings and improvements 946,805 940,846 Machinery and equipment 4,072,733 3,953,891 Software and computer equipment 186,218 185,243 Furniture, fixtures and other equipment 17,020 15,347 Construction in progress 236,539 39,261 Total property, plant and equipment 5,694,145 5,369,418 Less accumulated depreciation and amortization (3,409,244 ) (3,162,942 ) Total property, plant and equipment, net $ 2,284,901 $ 2,206,476 Depreciation expense for the three and nine months ended September 30, 2015 was $122.8 million and $370.7 million , respectively. Depreciation expense for the three and nine months ended September 30, 2014 was $119.4 million and $339.2 million , respectively. During 2013, we purchased land for a factory and research and development center in Korea ("K5") for $104.1 million . In 2014, we commenced construction activities and incurred costs of $29.8 million , including capitalized interest of $8.6 million , which is reflected in construction in progress. As of September 30, 2015 , construction in progress reflects $205.8 million of costs, including capitalized interest of $15.4 million .

Investments

Investments	9 Months Ended
	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments	12. Investments Investments consist of the following: September 30, December 31, Carrying Value (In thousands) Ownership Interest Carrying Value (In thousands) Ownership Interest Investment in unconsolidated affiliate $ 146,639 65.7 % $ 117,733 60.0 % J-Devices Corporation In October 2009, Amkor and Toshiba Corporation (“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. We invested $16.7 million for our original 30% equity interest and options to acquire additional equity interests. We exercised our options and increased our ownership interest in J-Devices from 30% to 60% in April 2013, for an aggregate purchase price of $67.4 million , and from 60% to 65.7% in January 2015, for an aggregate purchase price of $12.9 million . J-Devices is now owned 65.7% by Amkor and 34.3% by the former shareholders of NMD. The remaining option is exercisable beginning in the fourth quarter of 2015 and each year thereafter and permits us to increase our ownership interest in J-Devices up to 80% by purchasing shares owned by the other shareholders. If exercised in 2015, we would expect closing to occur by early 2016. After we own 80% or more shares, the original shareholders of NMD have a put option which allows them to sell their shares to us. The exercise price for all options is payable in cash and is determined using a formula based on the net book value and a multiple of earnings before interest, taxes, depreciation and amortization of J-Devices. The governance provisions currently applicable to J-Devices restrict our ability, even with our majority ownership, to cause J-Devices to take certain actions without the consent of the other investors. Accordingly, we account for our investment in J-Devices using the equity method of accounting. Under the equity method of accounting, we recognize our proportionate share of J-Devices' net income or loss, which is after J-Devices' income taxes in Japan, during each accounting period as a change in our investment in unconsolidated affiliate. J-Devices' financial information is converted to U.S. GAAP and translated into U.S. dollars using Japanese yen as the functional currency. In addition, we record equity method adjustments as a change in our investment. The equity method adjustments include the amortization of basis differences as a result of the cost of our investment differing from our proportionate share of J-Devices' equity. On June 30, 2014, J-Devices purchased 100% of the shares of our wholly-owned subsidiary engaged in semiconductor packaging and test operations in Japan. For additional information regarding this transaction, we refer you to Note 3 .

Accrued Expenses

Accrued Expenses	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Accrued Expenses	13. Accrued Expenses Accrued expenses consist of the following: September 30, December 31, (In thousands) Payroll and benefits $ 62,774 $ 77,635 Deferred revenue and customer advances 50,747 56,829 Accrued settlement costs 32,432 32,414 Income taxes payable 29,274 31,580 Accrued interest 27,619 15,947 Accrued severance plan obligations 13,794 13,226 Other accrued expenses 35,010 31,366 Total accrued expenses $ 251,650 $ 258,997

Debt

Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Debt	14. Debt Following is a summary of short-term borrowings and long-term debt: September 30, December 31, (In thousands) Debt of Amkor Technology, Inc.: Senior secured credit facilities: $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) $ 80,000 $ — Senior notes: 7.375% Senior notes, due May 2018 (2) — 345,000 6.625% Senior notes, due June 2021, $75 million related party 400,000 400,000 6.375% Senior notes, due October 2022 525,000 525,000 Debt of subsidiaries: Amkor Technology Korea, Inc. (10): $41 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2016 (3) — — Term loan, LIBOR plus 2.60%, due May 2018 (4) 100,000 — Term loan, LIBOR plus 2.70%, due December 2019 (5) 70,000 70,000 Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (6) 150,000 — Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (7) 80,000 — Term Loan, fund floating rate plus 1.60%, due June 2020 (8) 30,000 — Term loan, LIBOR plus 3.70%, due June 2016 (9) — 70,000 Term loan, foreign currency funding-linked base rate plus 1.80%, due March 2017 (7) — 80,000 Term loan, LIBOR plus 3.70%, due July 2017 (9) — 30,000 Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (8) — 5,000 1,435,000 1,525,000 Add: Unamortized premium 5,376 5,824 Less: Short-term borrowings and current portion of long-term debt — (5,000 ) Long-term debt (including related party) $ 1,440,376 $ 1,525,824 (1) Our $200.0 million senior secured revolving credit facility has a letter of credit sub-limit of $25.0 million . Interest is payable monthly in arrears, at LIBOR plus 1.25% to 1.75% ( 1.50% as of September 30, 2015 ). As of September 30, 2015 , the borrowing base for our revolving credit facility is $198.7 million, which is adjusted based on the amount of our eligible accounts receivable . As of September 30, 2015 , $118.3 million was available to be drawn. (2) In June 2015, we redeemed all $345.0 million aggregate principal amount of our outstanding 7.375% Senior Notes due 2018 ("Notes"). In accordance with the terms of the indenture governing the Notes, the redemption price was 101.844% of the principal amount of the Notes. We recorded a $6.4 million loss on extinguishment related to the premium paid on the call of the Notes and a $2.5 million charge for the write-off of the associated unamortized debt issuance costs. The redemption of the Notes was funded with cash on hand and borrowings under our credit facilities. (3) In June 2012, we entered into a $41.0 million revolving credit facility. Principal is payable at maturity. In February 2015, the facility was amended to lower the interest rate. Interest is due monthly in arrears, at a foreign currency funding-linked base rate plus 1.60% . As of September 30, 2015 , $41.0 million was available to be drawn. (4) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $120.0 million through May 2016 for working capital purposes. Principal is payable at maturity. Interest is payable quarterly in arrears, at LIBOR plus 2.60% ( 2.92% as of September 30, 2015 ). At September 30, 2015 , $20.0 million was available to be borrowed. (5) In November 2012, we entered into a term loan agreement pursuant to which we could borrow up to $100.0 million through March 2014. Principal is payable upon maturity. In April 2015, the term loan was amended and now bears interest at LIBOR plus 2.70% , payable quarterly in arrears ( 2.98% as of September 30, 2015 ). (6) In May 2015, we entered into a term loan agreement pursuant to which we borrowed $150.0 million for the repayment of inter-company debt. Principal is payable in semiannual installments of $30.0 million beginning in May 2019, with the remaining balance due at maturity. Interest is due quarterly in arrears, at a foreign currency funding-linked base rate plus 1.55% ( 2.99% as of September 30, 2015 ). (7) In May 2015, we entered into a term loan agreement pursuant to which we borrowed $80.0 million , replacing the existing term loan due March 2017 with that bank. Principal is payable in semiannual installments of $10.0 million beginning in May 2019, with the remaining due at maturity. Interest is due quarterly in arrears, at a foreign currency funding-linked base rate plus 1.55% ( 2.99% as of September 30, 2015 ). (8) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million through November 2016 for capital expenditures and terminated the term loan due September 2017. Principal is payable at maturity. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% ( 2.23% as of September 30, 2015 ). At September 30, 2015 , $120.0 million was available to be borrowed. (9) During the three months ended June 30, 2015, the outstanding balance was prepaid. (10) The loans in Korea are collateralized by substantially all the land, factories and equipment located at our facilities in Korea. The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. The agreements governing our indebtedness contain a number of affirmative and negative covenants which restrict our ability to pay dividends and could restrict our operations. We have never paid a dividend to our stockholders and we do not have any present plans for doing so. We were in compliance with all of our covenants at September 30, 2015 . Maturities Total Debt (In thousands) Payments due for the year ending December 31, 2015 $ — 2016 — 2017 — 2018 100,000 2019 230,000 Thereafter 1,105,000 Total debt $ 1,435,000

Severance and Pension Plans

Severance and Pension Plans	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Severance and Pension Plans	15. Severance and Pension Plans Korean Severance Plan Our subsidiary in Korea maintains an unfunded severance plan that covers certain employees that were employed prior to August 1, 2015. 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 for service provided prior to August 1, 2015. Factors used to determine severance benefits include employees' length of service, seniority and rate of pay. The employees' length of service and seniority are fixed as of August 1, 2015. The employees' rate of pay is adjusted to the 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 provision recorded for severance benefits for the three and nine months ended September 30, 2015 was $5.9 million and $20.7 million , respectively. The provision recorded for severance benefits for the three and nine months ended September 30, 2014 was $5.8 million and $12.6 million , respectively. For service periods subsequent to August 1, 2015, employees participate in either a defined benefit pension plan or a defined contribution plan. Foreign Defined Benefit Pension Plans Our subsidiaries in Japan, Korea, Malaysia, the Philippines and Taiwan sponsor defined benefit pension plans. Charges to expense are based upon actuarial analyses. The components of net periodic pension cost for these defined benefit plans are as follows: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Service cost $ 4,177 $ 1,101 $ 6,605 $ 3,974 Interest cost 725 748 2,251 2,321 Expected return on plan assets (817 ) (782 ) (2,523 ) (2,329 ) Amortization of prior service cost 8 9 25 108 Recognized actuarial loss 23 17 69 125 Net periodic pension cost $ 4,116 $ 1,093 $ 6,427 $ 4,199 As a result of the adoption of a defined benefit pension plan in Korea beginning on August 1, 2015, our net periodic pension cost has increased from the prior period. We expect to make contributions of $9.0 million during the remainder of 2015. We closely monitor the funded status of the defined benefit pension plans with respect to legislative requirements. We intend to make at least the minimum contribution required by law each year. Defined Contribution Plans We sponsor defined contribution plans in Korea, Malaysia, Taiwan and the U.S. Total defined contribution expense was $1.8 million and $6.9 million for the three and nine months ended September 30, 2015 , respectively, and $1.6 million and $5.4 million for the three and nine months ended September 30, 2014 , respectively.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	16. Fair Value Measurements The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers as follows: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data. The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of other non-current liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include cash equivalent money market funds and restricted cash money market funds. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets. Our recurring fair value measurements consist of the following: September 30, December 31, (In thousands) Cash equivalent money market funds (Level 1) $ 131,451 $ 145,938 Restricted cash money market funds (Level 1) 2,000 2,681 We also measure certain assets and liabilities, including property, plant and equipment and our investment in J-Devices, at fair value on a nonrecurring basis. We measure the fair value of our debt for disclosure purposes. The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis: September 30, 2015 December 31, 2014 Fair Value Carrying Value Fair Value Carrying Value (In thousands) Senior notes (Level 1) $ 872,202 $ 930,376 $ 1,268,619 $ 1,275,824 Revolving credit facility and term loans (Level 2) 509,075 510,000 254,999 255,000 Total debt $ 1,381,277 $ 1,440,376 $ 1,523,618 $ 1,530,824 The estimated fair value of our senior notes is based primarily on quoted market prices reported on or near the respective balance sheet dates. The estimated fair value of our revolving credit facility and term loans was calculated using a discounted cash flow analysis, which utilized market based assumptions including forward interest rates adjusted for credit risk.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	17. Commitments and Contingencies We have a letter of credit sub-facility of $25.0 million under our $ 200.0 million senior secured revolving credit facility that matures in December 2019. As of September 30, 2015 , we had $ 0.4 million of standby letters of credit outstanding. 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. Although the outcome of these matters is uncertain, 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. In accordance with the accounting guidance for loss contingencies, including legal proceedings, lawsuits, pending claims and other legal matters, we accrue for a loss contingency when we conclude that the likelihood of a loss is probable and the amount of the loss can be reasonably estimated. 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 we believe they are material and there is at least a reasonable possibility that a loss has been incurred. Attorney fees related to legal matters are expensed as incurred.

Interim Financial Statements (P

Interim Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The Consolidated Financial Statements and related disclosures as of September 30, 2015 , and for the three and nine months ended September 30, 2015 and 2014 , are unaudited, pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). The December 31, 2014 , Consolidated Balance Sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S.”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. In our opinion, these financial statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods. These financial statements should be read in conjunction with the financial statements included in our Annual Report for the year ended December 31, 2014 , filed on Form 10-K with the SEC on February 19, 2015. The results of operations for the three and nine months ended September 30, 2015 , are not necessarily indicative of the results to be expected for the full year. Unless the context otherwise requires, all references to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and our subsidiaries.
Use of Estimates	The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments.

Share-Based Compensation Plans

Share-Based Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of all common stock option activity	The following table summarizes our stock option activity for the nine months ended September 30, 2015 : 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, 2014 3,822 $ 6.25 Granted 315 7.12 Exercised (141 ) 4.70 Forfeited or expired (207 ) 5.20 Outstanding at September 30, 2015 3,789 $ 6.44 6.12 $ 206 Fully vested at September 30, 2015 and expected to vest thereafter 3,768 $ 6.44 6.11 $ 204 Exercisable at September 30, 2015 2,546 $ 6.95 5.04 $ 103
Assumptions used in valuing the weighted average fair values of the options granted	The following assumptions were used to calculate the weighted average fair values of the options granted: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 Expected life (in years) 6.0 6.1 5.8 6.1 Risk-free interest rate 1.8 % 2.0 % 1.8 % 2.0 % Volatility 44 % 56 % 45 % 57 % Dividend yield — — — — Weighted average grant date fair value per option granted $ 2.33 $ 5.43 $ 3.20 $ 4.46
Restricted share activity	The following table summarizes our restricted share activity for the nine months ended September 30, 2015 : Number of Shares (In thousands) Weighted Average Grant-Date Fair Value (Per share) Nonvested at December 31, 2014 660 $ 4.58 Awards granted 49 7.30 Awards vested (227 ) 4.87 Awards forfeited (25 ) 4.47 Nonvested at September 30, 2015 457 $ 4.73

Other Income and Expense (Table

Other Income and Expense (Tables)	9 Months Ended
	Sep. 30, 2015
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense) [Table Text Block]	Other income and expense consists of the following: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Interest income $ (523 ) $ (920 ) $ (2,196 ) $ (2,462 ) Foreign currency gain, net (8,499 ) (7,928 ) (9,751 ) (3,381 ) Loss on debt retirement — — 9,560 757 Gain on sale of subsidiary to J-Devices (Note 3) — — — (9,155 ) Other income, net (2,554 ) (778 ) (2,397 ) (1,048 ) Total other (income) expense, net $ (11,576 ) $ (9,626 ) $ (4,784 ) $ (15,289 )

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
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 Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands, except per share data) Net income attributable to Amkor $ 28,174 $ 47,097 $ 66,533 $ 117,251 Income allocated to participating securities — (149 ) (102 ) (383 ) Net income available to Amkor common stockholders — basic 28,174 46,948 66,431 116,868 Adjustment for dilutive securities on net income: Net income reallocated to participating securities — — — 9 Interest on 6.0% convertible notes due 2014, net of tax — — — 1,039 Net income attributable to Amkor — diluted $ 28,174 $ 46,948 $ 66,431 $ 117,916 Weighted average shares outstanding — basic 236,888 236,337 236,813 228,733 Effect of dilutive securities: Stock options and restricted share awards 86 1,172 355 841 6.0% convertible notes due 2014 — — — 7,098 Weighted average shares outstanding — diluted 236,974 237,509 237,168 236,672 Net income attributable to Amkor per common share: Basic $ 0.12 $ 0.20 $ 0.28 $ 0.51 Diluted 0.12 0.20 0.28 0.50
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 Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Stock options and restricted share awards 3,477 1,139 1,861 1,344

Equity and Accumulated Other 29

Equity and Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Changes in equity attributable to both Company and noncontrolling interests	The following tables reflect the changes in equity attributable to both Amkor and the noncontrolling interests: Attributable to Amkor Attributable to Noncontrolling Interests Total (In thousands) Equity at December 31, 2014 $ 1,116,235 $ 14,701 $ 1,130,936 Net income 66,533 2,386 68,919 Other comprehensive income 501 — 501 Issuance of stock through employee share-based compensation plans 657 — 657 Treasury stock acquired through surrender of shares for tax withholding (548 ) — (548 ) Share-based compensation 3,063 — 3,063 Subsidiary dividends paid to noncontrolling interests — (123 ) (123 ) Equity at September 30, 2015 $ 1,186,441 $ 16,964 $ 1,203,405 Attributable to Amkor Attributable to Noncontrolling Interests Total (In thousands) Equity at December 31, 2013 $ 953,740 $ 11,200 $ 964,940 Net income 117,251 2,508 119,759 Other comprehensive loss (17,223 ) — (17,223 ) Issuance of stock through employee share-based compensation plans 5,826 — 5,826 Treasury stock acquired through surrender of shares for tax withholding (1,348 ) — (1,348 ) Share-based compensation 2,766 — 2,766 Conversion of debt to common stock 56,350 — 56,350 Equity at September 30, 2014 $ 1,117,362 $ 13,708 $ 1,131,070
Schedule of Accumulated Other Comprehensive Income	The following tables reflect the changes in accumulated other comprehensive income (loss), net of tax: Defined Benefit Pension Foreign Currency Translation Equity Interest in J-Devices' Other Comprehensive Income (Loss) Total (In thousands) Accumulated other comprehensive loss at $ (2,525 ) $ (513 ) $ (29,829 ) $ (32,867 ) Other comprehensive (loss) income before reclassifications — (102 ) 537 435 Amounts reclassified from accumulated other comprehensive loss 66 — — 66 Other comprehensive income (loss) 66 (102 ) 537 501 Accumulated other comprehensive loss at $ (2,459 ) $ (615 ) $ (29,292 ) $ (32,366 ) Defined Benefit Pension Foreign Currency Translation Equity Interest in J-Devices' Other Comprehensive Income (Loss) Total (In thousands) Accumulated other comprehensive (loss) income at $ (1,013 ) $ 11,451 $ (10,693 ) $ (255 ) Other comprehensive income (loss) before reclassifications — 681 (5,939 ) (5,258 ) Amounts reclassified from accumulated other comprehensive (loss) income 622 (12,587 ) — (11,965 ) Other comprehensive income (loss) 622 (11,906 ) (5,939 ) (17,223 ) Accumulated other comprehensive loss at $ (391 ) $ (455 ) $ (16,632 ) $ (17,478 )

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following: September 30, December 31, 2014 (In thousands) Raw materials and purchased components $ 150,736 $ 161,942 Work-in-process 57,477 61,437 Total inventories $ 208,213 $ 223,379

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Summary of Property, plant and equipment	Property, plant and equipment consist of the following: September 30, December 31, 2014 (In thousands) Land $ 207,985 $ 207,985 Land use rights 26,845 26,845 Buildings and improvements 946,805 940,846 Machinery and equipment 4,072,733 3,953,891 Software and computer equipment 186,218 185,243 Furniture, fixtures and other equipment 17,020 15,347 Construction in progress 236,539 39,261 Total property, plant and equipment 5,694,145 5,369,418 Less accumulated depreciation and amortization (3,409,244 ) (3,162,942 ) Total property, plant and equipment, net $ 2,284,901 $ 2,206,476

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments	Investments consist of the following: September 30, December 31, Carrying Value (In thousands) Ownership Interest Carrying Value (In thousands) Ownership Interest Investment in unconsolidated affiliate $ 146,639 65.7 % $ 117,733 60.0 %

Accrued Expenses (Tables)

Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Summarized Accrued expenses	Accrued expenses consist of the following: September 30, December 31, (In thousands) Payroll and benefits $ 62,774 $ 77,635 Deferred revenue and customer advances 50,747 56,829 Accrued settlement costs 32,432 32,414 Income taxes payable 29,274 31,580 Accrued interest 27,619 15,947 Accrued severance plan obligations 13,794 13,226 Other accrued expenses 35,010 31,366 Total accrued expenses $ 251,650 $ 258,997

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary of Short term Borrowings And Long term Debt	Following is a summary of short-term borrowings and long-term debt: September 30, December 31, (In thousands) Debt of Amkor Technology, Inc.: Senior secured credit facilities: $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) $ 80,000 $ — Senior notes: 7.375% Senior notes, due May 2018 (2) — 345,000 6.625% Senior notes, due June 2021, $75 million related party 400,000 400,000 6.375% Senior notes, due October 2022 525,000 525,000 Debt of subsidiaries: Amkor Technology Korea, Inc. (10): $41 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2016 (3) — — Term loan, LIBOR plus 2.60%, due May 2018 (4) 100,000 — Term loan, LIBOR plus 2.70%, due December 2019 (5) 70,000 70,000 Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (6) 150,000 — Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (7) 80,000 — Term Loan, fund floating rate plus 1.60%, due June 2020 (8) 30,000 — Term loan, LIBOR plus 3.70%, due June 2016 (9) — 70,000 Term loan, foreign currency funding-linked base rate plus 1.80%, due March 2017 (7) — 80,000 Term loan, LIBOR plus 3.70%, due July 2017 (9) — 30,000 Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (8) — 5,000 1,435,000 1,525,000 Add: Unamortized premium 5,376 5,824 Less: Short-term borrowings and current portion of long-term debt — (5,000 ) Long-term debt (including related party) $ 1,440,376 $ 1,525,824 (1) Our $200.0 million senior secured revolving credit facility has a letter of credit sub-limit of $25.0 million . Interest is payable monthly in arrears, at LIBOR plus 1.25% to 1.75% ( 1.50% as of September 30, 2015 ). As of September 30, 2015 , the borrowing base for our revolving credit facility is $198.7 million, which is adjusted based on the amount of our eligible accounts receivable . As of September 30, 2015 , $118.3 million was available to be drawn. (2) In June 2015, we redeemed all $345.0 million aggregate principal amount of our outstanding 7.375% Senior Notes due 2018 ("Notes"). In accordance with the terms of the indenture governing the Notes, the redemption price was 101.844% of the principal amount of the Notes. We recorded a $6.4 million loss on extinguishment related to the premium paid on the call of the Notes and a $2.5 million charge for the write-off of the associated unamortized debt issuance costs. The redemption of the Notes was funded with cash on hand and borrowings under our credit facilities. (3) In June 2012, we entered into a $41.0 million revolving credit facility. Principal is payable at maturity. In February 2015, the facility was amended to lower the interest rate. Interest is due monthly in arrears, at a foreign currency funding-linked base rate plus 1.60% . As of September 30, 2015 , $41.0 million was available to be drawn. (4) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $120.0 million through May 2016 for working capital purposes. Principal is payable at maturity. Interest is payable quarterly in arrears, at LIBOR plus 2.60% ( 2.92% as of September 30, 2015 ). At September 30, 2015 , $20.0 million was available to be borrowed. (5) In November 2012, we entered into a term loan agreement pursuant to which we could borrow up to $100.0 million through March 2014. Principal is payable upon maturity. In April 2015, the term loan was amended and now bears interest at LIBOR plus 2.70% , payable quarterly in arrears ( 2.98% as of September 30, 2015 ). (6) In May 2015, we entered into a term loan agreement pursuant to which we borrowed $150.0 million for the repayment of inter-company debt. Principal is payable in semiannual installments of $30.0 million beginning in May 2019, with the remaining balance due at maturity. Interest is due quarterly in arrears, at a foreign currency funding-linked base rate plus 1.55% ( 2.99% as of September 30, 2015 ). (7) In May 2015, we entered into a term loan agreement pursuant to which we borrowed $80.0 million , replacing the existing term loan due March 2017 with that bank. Principal is payable in semiannual installments of $10.0 million beginning in May 2019, with the remaining due at maturity. Interest is due quarterly in arrears, at a foreign currency funding-linked base rate plus 1.55% ( 2.99% as of September 30, 2015 ). (8) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million through November 2016 for capital expenditures and terminated the term loan due September 2017. Principal is payable at maturity. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% ( 2.23% as of September 30, 2015 ). At September 30, 2015 , $120.0 million was available to be borrowed. (9) During the three months ended June 30, 2015, the outstanding balance was prepaid. (10) The loans in Korea are collateralized by substantially all the land, factories and equipment located at our facilities in Korea.
Schedule of Maturities of Long-term Debt [Table Text Block]	Maturities Total Debt (In thousands) Payments due for the year ending December 31, 2015 $ — 2016 — 2017 — 2018 100,000 2019 230,000 Thereafter 1,105,000 Total debt $ 1,435,000

Severance and Pension Plans (Ta

Severance and Pension Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Components of net periodic pension cost	The components of net periodic pension cost for these defined benefit plans are as follows: For the Three Months Ended For the Nine Months Ended 2015 2014 2015 2014 (In thousands) Service cost $ 4,177 $ 1,101 $ 6,605 $ 3,974 Interest cost 725 748 2,251 2,321 Expected return on plan assets (817 ) (782 ) (2,523 ) (2,329 ) Amortization of prior service cost 8 9 25 108 Recognized actuarial loss 23 17 69 125 Net periodic pension cost $ 4,116 $ 1,093 $ 6,427 $ 4,199

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets	Our recurring fair value measurements consist of the following: September 30, December 31, (In thousands) Cash equivalent money market funds (Level 1) $ 131,451 $ 145,938 Restricted cash money market funds (Level 1) 2,000 2,681
Financial instruments that are not recorded at fair value	The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis: September 30, 2015 December 31, 2014 Fair Value Carrying Value Fair Value Carrying Value (In thousands) Senior notes (Level 1) $ 872,202 $ 930,376 $ 1,268,619 $ 1,275,824 Revolving credit facility and term loans (Level 2) 509,075 510,000 254,999 255,000 Total debt $ 1,381,277 $ 1,440,376 $ 1,523,618 $ 1,530,824

Sale of Subsidiary to J-Devic37

Sale of Subsidiary to J-Devices (Details) $ in Thousands, ¥ in Billions	1 Months Ended		3 Months Ended			9 Months Ended
	Jun. 30, 2014JPY (¥)	Jun. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2015JPY (¥)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary to J-Devices			$ 0	$ 0		$ 0	$ 9,155
J-Devices [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Combination, Bargain Purchase, Gain Recognized, Amount					$ 14,700
Proportionate Share Of Investee Bargain Purchase Gain										$ 8,800
Amkor Iwate Company Ltd [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of Stock, Percentage of Ownership before Transaction	100.00%	100.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds | ¥	¥ 1.1
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	¥ 0.1	$ 1,000
Proceeds to Be Received from Divestiture of Interest in Consolidated Subsidiaries								¥ 1	$ 8,400
Gain on sale of subsidiary to J-Devices					9,200
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)					12,600
Combined Net Gain from Sale of Subsidiary					$ 18,000

Share-Based Compensation Plan38

Share-Based Compensation Plans Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 0.8	$ 0.9	$ 3.1	$ 2.8

Share-Based Compensation Plan39

Share-Based Compensation Plans Stock Options (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding beginning balance	3,822
Weighted average exercise price per share outstanding beginning balance | $ / shares	$ 6.25
Number of shares granted	315
Weighted average exercise price per share granted | $ / shares	$ 7.12
Number of shares exercised	(141)
Weighted average exercise price per share exercised | $ / shares	$ 4.70
Number of shares forfeited or expired	(207)
Weighted average exercise price per share forfeited or expired | $ / shares	$ 5.20
Number of shares outstanding ending balance	3,789
Weighted average exercise price per share outstanding ending balance | $ / shares	$ 6.44
Weighted average exercise price per share average contractual term (years)	6 years 1 month 13 days
Aggregate intrinsic value outstanding ending balance (in dollars) | $	$ 206
Number of shares fully vested and expected to vest	3,768
Weighted average exercise price per share fully vested and expected to vest | $ / shares	$ 6.44
Weighted average remaining contractual term fully vested and expected to vest (years)	6 years 1 month 10 days
Aggregate intrinsic value fully vested and expected to vest (in dollars) | $	$ 204
Number of shares exercisable	2,546
Weighted average exercise price per share exercisable | $ / shares	$ 6.95
Weighted average remaining contractual term exercisable (years)	5 years 15 days
Aggregate intrinsic value exercisable (in dollars) | $	$ 103

Share-Based Compensation Plan40

Share-Based Compensation Plans Weighted Average Fair Value (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years 1 day	6 years 1 month 6 days	5 years 9 months 1 day	6 years 1 month 6 days
Risk-free interest rate	1.80%	2.00%	1.80%	2.00%
Volatility	44.00%	56.00%	45.00%	57.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Weighted average grant date fair value per option granted (in dollars per share)	$ 2.33	$ 5.43	$ 3.20	$ 4.46

Share-Based Compensation Plan41

Share-Based Compensation Plans Restricted Shares (Details) - Restricted shares [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares nonvested beginning balance	660
Weighted average grant-date fair value nonvested beginning balance (in dollars per share) | $ / shares	$ 4.58
Number of shares awards granted	49
Weighted average grant-date fair value awards granted (in dollars per share) | $ / shares	$ 7.30
Number of shares awards vested	(227)
Weighted average grant-date fair value awards vested (in dollars per share) | $ / shares	$ 4.87
Number of shares awards forfeited	(25)
Weighted average grant-date fair value awards forfeited (in dollars per share) | $ / shares	$ 4.47
Number of shares nonvested ending balance	457
Weighted average grant-date fair value nonvested ending balance (in dollars per share) | $ / shares	$ 4.73

Share-Based Compensation Plan42

Share-Based Compensation Plans Textuals (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense from share-based compensation awards	$ 3.1
Weighted-average period of recognition of unrecognized compensation expense (in years)	2 years
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense from share-based compensation awards	$ 1.8
Weighted-average period of recognition of unrecognized compensation expense (in years)	1 year 5 months 1 day

Other Income and Expense (Detai

Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Income and Expenses [Abstract]
Interest income	$ (523)	$ (920)	$ (2,196)	$ (2,462)
Foreign currency gain, net	(8,499)	(7,928)	(9,751)	(3,381)
Loss on debt retirement	0	0	(9,560)	(757)
Gain on sale of subsidiary to J-Devices (Note 3)	0	0	0	9,155
Other income, net	(2,554)	(778)	(2,397)	(1,048)
Total other (income) expense, net	$ (11,576)	$ (9,626)	$ (4,784)	$ (15,289)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 16,568	$ 14,985	$ 27,198	$ 32,425

Income Taxes Unrecognized Tax B

Income Taxes Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits	$ 10.4	$ 12.7

Earnings Per Share Earnings P46

Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Dilutive Securities Adjustments [Line Items]
Net income attributable to Amkor	$ 28,174	$ 47,097	$ 66,533	$ 117,251
Income allocated to participating securities	0	(149)	(102)	(383)
Net income available to Amkor common stockholders — basic	28,174	46,948	66,431	116,868
Adjustment for dilutive securities on net income:
Net income reallocated to participating securities	0	0	0	9
Net income attributable to Amkor — diluted	$ 28,174	$ 46,948	$ 66,431	$ 117,916
Weighted average shares outstanding — basic	236,888	236,337	236,813	228,733
Effect of dilutive securities:
Weighted average shares outstanding — diluted	236,974	237,509	237,168	236,672
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.12	$ 0.20	$ 0.28	$ 0.51
Diluted (in dollars per share)	$ 0.12	$ 0.20	$ 0.28	$ 0.50
Convertible Senior Subordinated Notes Due April 2014 [Member]
Adjustment for dilutive securities on net income:
Interest on 6.0% convertible notes due 2014, net of tax	$ 0	$ 0	$ 0	$ 1,039
Effect of dilutive securities:
6.0% convertible notes due 2014	0	0	0	7,098
Net income attributable to Amkor per common share:
Interest rate on convertible senior subordinated notes due April 2014	0.00%	6.00%	0.00%	6.00%
Stock Options Dilutive Effect [Member]
Effect of dilutive securities:
Stock options and restricted share awards	86	1,172	355	841

Earnings Per Share Antidilutive

Earnings Per Share Antidilutive (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Options And Restricted Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted share awards	3,477	1,139	1,861	1,344

Equity and Accumulated Other 48

Equity and Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, Beginning balance			$ 1,130,936	$ 964,940
Net income	$ 29,021	$ 48,170	68,919	119,759
Other comprehensive income	4,619	(9,727)	501	(17,223)
Issuance of stock through employee share-based compensation plans			657	5,826
Treasury stock acquired through surrender of shares for tax withholding			(548)	(1,348)
Share-based compensation expense			3,063	2,766
Payments of Ordinary Dividends, Noncontrolling Interest			(123)	0
Conversion of debt to common stock				56,350
Equity, Ending balance	1,203,405	1,131,070	1,203,405	1,131,070
Amkor [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, Beginning balance			1,116,235	953,740
Net income			66,533	117,251
Other comprehensive income			501	(17,223)
Issuance of stock through employee share-based compensation plans			657	5,826
Treasury stock acquired through surrender of shares for tax withholding			(548)	(1,348)
Share-based compensation expense			3,063	2,766
Payments of Ordinary Dividends, Noncontrolling Interest			0
Conversion of debt to common stock				56,350
Equity, Ending balance	1,186,441	1,117,362	1,186,441	1,117,362
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity, Beginning balance			14,701	11,200
Net income			2,386	2,508
Other comprehensive income			0	0
Issuance of stock through employee share-based compensation plans			0	0
Treasury stock acquired through surrender of shares for tax withholding			0	0
Share-based compensation expense			0	0
Payments of Ordinary Dividends, Noncontrolling Interest			(123)
Conversion of debt to common stock				0
Equity, Ending balance	$ 16,964	$ 13,708	$ 16,964	$ 13,708

Equity and Accumulated Other 49

Equity and Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			$ (32,867)	$ (255)
Other comprehensive income (loss) before reclassifications			435	(5,258)
Amounts reclassified from accumulated other comprehensive (loss) income			66	(11,965)
Total other comprehensive income (loss)	$ 4,619	$ (9,727)	501	(17,223)
Accumulated other comprehensive (loss) income, ending balance	(32,366)	(17,478)	(32,366)	(17,478)
Defined Benefit Pension [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			(2,525)	(1,013)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive (loss) income			66	622
Total other comprehensive income (loss)			66	622
Accumulated other comprehensive (loss) income, ending balance	(2,459)	(391)	(2,459)	(391)
Foreign Currency Translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			(513)	11,451
Other comprehensive income (loss) before reclassifications			(102)	681
Amounts reclassified from accumulated other comprehensive (loss) income			0	(12,587)
Total other comprehensive income (loss)			(102)	(11,906)
Accumulated other comprehensive (loss) income, ending balance	(615)	(455)	(615)	(455)
Equity Interest in J-Devices' Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive (loss) income, beginning balance			(29,829)	(10,693)
Other comprehensive income (loss) before reclassifications			537	(5,939)
Amounts reclassified from accumulated other comprehensive (loss) income			0	0
Total other comprehensive income (loss)			537	(5,939)
Accumulated other comprehensive (loss) income, ending balance	$ (29,292)	$ (16,632)	$ (29,292)	$ (16,632)

Factoring of Accounts Receiva50

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Total Factored [Member]
Accounts Receivable Sold without Recourse [Line Items]
Accounts Receivable Sold without Recourse	$ 82.4	$ 102	$ 235.3	$ 226.8
Factoring Fees [Member]
Accounts Receivable Sold without Recourse [Line Items]
Accounts Receivable Sold without Recourse	$ 0.3	$ 0.4	$ 1.1	$ 1

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventories
Raw materials and purchased components	$ 150,736	$ 161,942
Work-in-process	57,477	61,437
Total inventories	$ 208,213	$ 223,379

Property, Plant and Equipment52

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,694,145	$ 5,369,418
Less accumulated depreciation and amortization	(3,409,244)	(3,162,942)
Total property, plant and equipment, net	2,284,901	2,206,476
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	207,985	207,985
Land use rights [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,845	26,845
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	946,805	940,846
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,072,733	3,953,891
Software and computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	186,218	185,243
Furniture, fixtures and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,020	15,347
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 236,539	$ 39,261

Property, Plant and Equipment53

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 122,800	$ 119,400	$ 370,700	$ 339,200
Property, Plant and Equipment, Gross	5,694,145		5,694,145		$ 5,369,418
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	207,985		207,985		207,985
Land [Member] | K5 Factory [Member] | KOREA, REPUBLIC OF
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	104,100		104,100		104,100
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	236,539		236,539		39,261
Construction in Progress [Member] | K5 Factory [Member] | KOREA, REPUBLIC OF
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	205,800		205,800		29,800
Accumulated Capitalized Interest Costs	$ 15,400		$ 15,400		$ 8,600

Investments (Details)

Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jan. 31, 2015	Dec. 31, 2014	Apr. 30, 2013	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 146,639		$ 117,733
J-Devices [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value	$ 146,639		$ 117,733
Ownership interest	65.70%	65.70%	60.00%	60.00%	30.00%

Investments Narrative (Details)

Investments Narrative (Details) - USD ($) $ in Thousands	1 Months Ended				9 Months Ended
	Jan. 31, 2015	Jun. 30, 2014	Apr. 30, 2013	Oct. 31, 2009	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Businesses and Interest in Affiliates					$ 12,908	$ 0
Japanese Subsidiary [Member]
Schedule of Equity Method Investments [Line Items]
Sale of Stock, Percentage of Ownership before Transaction		100.00%
J-Devices [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest	65.70%		60.00%		65.70%		60.00%	30.00%
Payments to Acquire Businesses and Interest in Affiliates	$ 12,900		$ 67,400	$ 16,700
Ownership Threshold 2015 [Member] | J-Devices [Member]
Schedule of Equity Method Investments [Line Items]
Maximum ownership ratio of call options					80.00%
Minimum ownership threshold, put option					80.00%
Former NMD Shareholders [Member] | J-Devices [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest					34.30%

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Payroll and benefits	$ 62,774	$ 77,635
Deferred revenue and customer advances	50,747	56,829
Accrued settlement costs	32,432	32,414
Income taxes payable	29,274	31,580
Accrued interest	27,619	15,947
Accrued severance plan obligations	13,794	13,226
Other accrued expenses	35,010	31,366
Total accrued expenses	$ 251,650	$ 258,997

Debt Long Term Debt (Details)

Debt Long Term Debt (Details) - USD ($)	5 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Jun. 30, 2015	May. 31, 2015	Dec. 31, 2014	Jun. 30, 2012
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 1,435,000,000	$ 1,435,000,000			$ 1,525,000,000
Add: Unamortized premium	5,376,000	5,376,000			5,824,000
Less: Short-term borrowings and current portion of long-term debt	0	0			(5,000,000)
Long-term debt (including related party)	1,440,376,000	1,440,376,000			1,525,824,000
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	80,000,000	$ 80,000,000			0
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 1.25%-1.75%
Line of Credit Facility, Maximum Borrowing Capacity	200,000,000	$ 200,000,000
7.375% Senior notes, due May 2018 (2) | Senior notes (Level 1)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 0	$ 0			345,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.375%	7.375%	7.375%
6.625% Senior notes, due June 2021, $75 million related party | Senior notes (Level 1)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 400,000,000	$ 400,000,000			400,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.625%	6.625%
Debt Instrument Face Amount Related Party	$ 75,000,000	$ 75,000,000
6.375% Senior notes, due October 2022 | Senior notes (Level 1)
Debt Instrument [Line Items]
Long-term Debt Including Related Party, Gross	$ 525,000,000	$ 525,000,000			525,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2016 (3) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.60%
Long-term Debt Including Related Party, Gross	$ 0	$ 0			0
Debt Instrument, Description of Variable Rate Basis		foreign currency funding-linked base rate plus 1.60%
Line of Credit Facility, Maximum Borrowing Capacity	$ 41,000,000	$ 41,000,000				$ 41,000,000
KOREA, REPUBLIC OF | Term loan, LIBOR plus 2.60%, due May 2018 (4) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.60%	2.60%
Long-term Debt Including Related Party, Gross	$ 100,000,000	$ 100,000,000			0
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 2.60%
KOREA, REPUBLIC OF | Term loan, LIBOR plus 2.70%, due December 2019 (5) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.70%
Long-term Debt Including Related Party, Gross	$ 70,000,000	$ 70,000,000			70,000,000
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 2.70%
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (6) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.55%	1.55%
Long-term Debt Including Related Party, Gross	$ 150,000,000	$ 150,000,000		$ 150,000,000	0
Debt Instrument, Description of Variable Rate Basis		foreign currency funding-linked base rate plus 1.55%
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (7) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.55%	1.55%
Long-term Debt Including Related Party, Gross	$ 80,000,000	$ 80,000,000		$ 80,000,000	0
Debt Instrument, Description of Variable Rate Basis		foreign currency funding-linked base rate plus 1.55%
KOREA, REPUBLIC OF | Term Loan, fund floating rate plus 1.60%, due June 2020 (8) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.60%	1.60%
Long-term Debt Including Related Party, Gross	$ 30,000,000	$ 30,000,000			0
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 1.60%
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due June 2016 (9) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.70%
Long-term Debt Including Related Party, Gross	0	$ 0			70,000,000
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 3.70%
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.80%, due March 2017 (7) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.80%
Long-term Debt Including Related Party, Gross	0	$ 0			80,000,000
Debt Instrument, Description of Variable Rate Basis		foreign currency funding-linked base rate plus 1.80%
KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (9) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.70%
Long-term Debt Including Related Party, Gross	0	$ 0			30,000,000
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 3.70%
KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (8) | Subsidiary Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Long-term Debt Including Related Party, Gross	$ 0	$ 0			$ 5,000,000
Debt Instrument, Description of Variable Rate Basis		foreign currency funding-linked base rate plus 1.75%
Minimum [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
Maximum [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%

Debt (Details)

Debt (Details) - USD ($)	1 Months Ended	5 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Jun. 01, 2015	May. 31, 2015	Dec. 31, 2014	Nov. 30, 2012	Jun. 30, 2012
Debt Instrument [Line Items]
Borrowings under revolving credit facilities			$ 180,000,000	$ 0
Long-term Debt Including Related Party, Gross		$ 1,435,000,000	$ 1,435,000,000				$ 1,525,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term Loan, fund floating rate plus 1.60%, due June 2020 (8)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.60%	1.60%
Debt, interest rate description			LIBOR plus 1.60%
Total effective rate (percentage)		2.23%	2.23%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 120,000,000	$ 120,000,000			$ 150,000,000
Long-term Debt Including Related Party, Gross		30,000,000	$ 30,000,000				0
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 3.70%, due July 2017 (9)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.70%
Debt, interest rate description			LIBOR plus 3.70%
Long-term Debt Including Related Party, Gross		0	$ 0				30,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.75%, due September 2017 (8)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Debt, interest rate description			foreign currency funding-linked base rate plus 1.75%
Long-term Debt Including Related Party, Gross		$ 0	$ 0				5,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 2.60%, due May 2018 (4)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.60%	2.60%
Debt, interest rate description			LIBOR plus 2.60%
Total effective rate (percentage)		2.92%	2.92%
Debt Instrument, Unused Borrowing Capacity, Amount		$ 20,000,000	$ 20,000,000			120,000,000
Long-term Debt Including Related Party, Gross		$ 100,000,000	$ 100,000,000				0
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, LIBOR plus 2.70%, due December 2019 (5)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.70%
Debt, interest rate description			LIBOR plus 2.70%
Total effective rate (percentage)		2.98%	2.98%
Debt Instrument, Unused Borrowing Capacity, Amount								$ 100,000,000
Long-term Debt Including Related Party, Gross		$ 70,000,000	$ 70,000,000				70,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (6)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.55%	1.55%
Debt, interest rate description			foreign currency funding-linked base rate plus 1.55%
Total effective rate (percentage)		2.99%	2.99%
Long-term Debt Including Related Party, Gross		$ 150,000,000	$ 150,000,000			150,000,000	0
Debt Instrument, Periodic Payment, Principal		$ 30,000,000
Subsidiary Term Loans [Member] | KOREA, REPUBLIC OF | Term loan, foreign currency funding-linked base rate plus 1.55%, due May 2020 (7)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.55%	1.55%
Debt, interest rate description			foreign currency funding-linked base rate plus 1.55%
Total effective rate (percentage)		2.99%	2.99%
Long-term Debt Including Related Party, Gross		$ 80,000,000	$ 80,000,000			$ 80,000,000	0
Debt Instrument, Periodic Payment, Principal		$ 10,000,000
Senior notes (Level 1) | 7.375% Senior notes, due May 2018 (2)
Debt Instrument [Line Items]
Interest rate on convertible senior subordinated notes due April 2014	7.375%	7.375%	7.375%
Long-term Debt Including Related Party, Gross		$ 0	$ 0				345,000,000
Redemption Price					101.844%
Gains (Losses) on Extinguishment of Debt	$ 6,400,000
Extinguishment of Debt, Amount	2,500,000
Repayments of Debt	$ 345,000,000
Senior notes (Level 1) | 6.625% Senior notes, due June 2021, $75 million related party
Debt Instrument [Line Items]
Interest rate on convertible senior subordinated notes due April 2014		6.625%	6.625%
Debt Instrument Face Amount Related Party		$ 75,000,000	$ 75,000,000
Long-term Debt Including Related Party, Gross		400,000,000	400,000,000				400,000,000
Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 200,000,000	$ 200,000,000
Debt, interest rate description			LIBOR plus 1.25%-1.75%
Total effective rate (percentage)		1.50%	1.50%
Line of Credit Facility, Borrowing Capacity, Description			borrowing base for our revolving credit facility is $198.7 million, which is adjusted based on the amount of our eligible accounts receivable
Long-term Debt Including Related Party, Gross		$ 80,000,000	$ 80,000,000				0
Current borrowing capacity		118,300,000	118,300,000
Revolving Credit Facility [Member] | Line of Credit [Member] | KOREA, REPUBLIC OF | $41 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2016 (3)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		41,000,000	$ 41,000,000						$ 41,000,000
Debt Instrument, Basis Spread on Variable Rate			1.60%
Debt, interest rate description			foreign currency funding-linked base rate plus 1.60%
Long-term Debt Including Related Party, Gross		0	$ 0				$ 0
Current borrowing capacity		41,000,000	41,000,000
Letter of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Credit facility, borrowing capacity		$ 25,000,000	$ 25,000,000
Maximum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.75%
Minimum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1)
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.25%

Debt Debt Maturities (Details)

Debt Debt Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2,015	$ 0
2,016	0
2,017	0
2,018	100,000
2,019	230,000
Thereafter	1,105,000
Total debt	$ 1,435,000	$ 1,525,000

Severance and Pension Plans (De

Severance and Pension Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 1,800	$ 1,600	$ 6,900	$ 5,400
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4,177	1,101	6,605	3,974
Interest cost	725	748	2,251	2,321
Expected return on plan assets	(817)	(782)	(2,523)	(2,329)
Amortization of prior service cost	8	9	25	108
Recognized actuarial loss	23	17	69	125
Net periodic pension cost	$ 4,116	$ 1,093	$ 6,427	$ 4,199

Severance and Pension Plans Tex

Severance and Pension Plans Textuals (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 9
Korean Severance Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Provision of Severance Benefits	$ 5.9	$ 5.8	$ 20.7	$ 12.6

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalent money market funds (Level 1)	$ 131,451	$ 145,938
Restricted cash money market funds (Level 1)	$ 2,000	$ 2,681

Fair Value Measurements Fair 63

Fair Value Measurements Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	$ 1,381,277	$ 1,523,618
Senior notes (Level 1) | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	872,202	1,268,619
Revolving credit facility and term loans (Level 2) | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	509,075	254,999
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	1,440,376	1,530,824
Carrying Value [Member] | Senior notes (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	930,376	1,275,824
Carrying Value [Member] | Revolving credit facility and term loans (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Disclosure for Debt	$ 510,000	$ 255,000

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2015USD ($)
Letter of Credit [Member]
Loss Contingencies [Line Items]
Available letter of credit subfacility utilized	$ 0.4
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Letter of Credit [Member]
Loss Contingencies [Line Items]
Credit facility, borrowing capacity	25
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 (1) | Line of Credit [Member] | Revolving Credit Facility [Member]
Loss Contingencies [Line Items]
Credit facility, borrowing capacity	$ 200