Amkor Technology (AMKR) 10-Q 29 Oct 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2021	Oct. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-29472
Entity Registrant Name	AMKOR TECHNOLOGY, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-1722724
Entity Address, Address Line One	2045 East Innovation Circle
Entity Address, City or Town	Tempe
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85284
City Area Code	480
Local Phone Number	821-5000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	AMKR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		244,525,131
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001047127

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,681,000	$ 1,354,023	$ 4,413,685	$ 3,679,548
Cost of sales	1,356,168	1,112,938	3,550,499	3,057,235
Gross profit	324,832	241,085	863,186	622,313
Selling, general and administrative	72,581	77,781	223,538	224,623
Research and development	40,790	35,835	128,624	99,624
Total operating expenses	113,371	113,616	352,162	324,247
Operating income	211,461	127,469	511,024	298,066
Interest expense	12,896	16,404	38,333	49,461
Other (income) expense, net	(501)	2,415	(508)	1,567
Total other expense, net	12,395	18,819	37,825	51,028
Income before taxes	199,066	108,650	473,199	247,038
Income tax expense	17,219	15,753	44,875	33,504
Net income	181,847	92,897	428,324	213,534
Net income attributable to non-controlling interests	(993)	(746)	(1,855)	(2,070)
Net income attributable to Amkor	$ 180,854	$ 92,151	$ 426,469	$ 211,464
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.74	$ 0.38	$ 1.75	$ 0.88
Diluted (in dollars per share)	$ 0.74	$ 0.38	$ 1.74	$ 0.87
Shares used in computing per common share amounts:
Basic (in shares)	244,100	241,675	243,746	241,232
Diluted (in shares)	245,942	242,592	245,611	241,937

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 181,847	$ 92,897	$ 428,324	$ 213,534
Other comprehensive income (loss), net of tax:
Adjustments to net unrealized gains (losses) on available-for-sale debt investments	(101)	(165)	(147)	193
Adjustments to unrealized components of defined benefit pension plans	26	11	77	34
Foreign currency translation	(102)	4,191	(11,264)	3,967
Total other comprehensive income (loss)	(177)	4,037	(11,334)	4,194
Comprehensive income	181,670	96,934	416,990	217,728
Comprehensive income attributable to non-controlling interests	(993)	(746)	(1,855)	(2,070)
Comprehensive income attributable to Amkor	$ 180,677	$ 96,188	$ 415,135	$ 215,658

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 545,592	$ 698,002
Restricted cash	929	1,007
Short-term investments (amortized cost of $244,627 and $133,744 in 2021 and 2020, respectively)	244,470	133,769
Accounts receivable, net of allowances	1,289,617	962,643
Inventories	445,918	297,293
Other current assets	48,598	40,218
Total current assets	2,575,124	2,132,932
Property, plant and equipment, net	2,901,564	2,566,002
Operating lease right of use assets	146,210	147,236
Goodwill	25,351	27,325
Restricted cash	3,508	3,188
Other assets	118,691	145,628
Total assets	5,770,448	5,022,311
Current liabilities:
Short-term borrowings and current portion of long-term debt	140,380	149,007
Trade accounts payable	815,877	636,434
Capital expenditures payable	393,660	181,339
Accrued expenses	389,068	349,207
Total current liabilities	1,738,985	1,315,987
Long-term debt	884,236	1,005,339
Pension and severance obligations	145,633	159,610
Long-term operating lease liabilities	76,955	84,420
Other non-current liabilities	164,960	102,996
Total liabilities	3,010,769	2,668,352
Commitments and contingencies (Note 15)
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; 290,341 and 288,923 shares issued; and 244,190 and 242,829 shares outstanding in 2021 and 2020, respectively	290	289
Additional paid-in capital	1,973,207	1,953,378
Retained earnings	959,641	562,502
Accumulated other comprehensive income (loss)	15,936	27,270
Treasury stock, at cost, 46,151 and 46,094 shares in 2021 and 2020, respectively	(219,061)	(217,740)
Total Amkor stockholders’ equity	2,730,013	2,325,699
Non-controlling interests in subsidiaries	29,666	28,260
Total equity	2,759,679	2,353,959
Total liabilities and equity	$ 5,770,448	$ 5,022,311

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Short term investments amortized cost	$ 244,627	$ 133,744
Stockholders’ equity:
Preferred stock designated Series A, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock designated Series A, shares authorized	10,000,000	10,000,000
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	500,000,000	500,000,000
Common stock, shares issued	290,341,000	288,923,000
Common stock, shares outstanding	244,190,000	242,829,000
Treasury stock, shares	46,151,000	46,094,000

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Total Amkor Stockholders’ Equity	Common Stock	Additional Paid- In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest in Subsidiaries
Balance at beginning of period, shares at Dec. 31, 2019			286,877
Balance at beginning of period, shares at Dec. 31, 2019							(46,072)
Balance at beginning of period at Dec. 31, 2019	$ 1,990,239	$ 1,963,739	$ 287	$ 1,927,739	$ 234,077	$ 19,115	$ (217,479)	$ 26,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	213,534	211,464			211,464			2,070
Other comprehensive income (loss)	4,194	4,194				4,194
Treasury stock acquired through surrender of shares for tax withholding, shares							(16)
Treasury stock acquired through surrender of shares for tax withholding	(181)	(181)					$ (181)
Issuance of stock through share-based compensation plans, shares			1,166
Issuance of stock through share-based compensation plans	9,695	9,695	$ 1	9,694
Share-based compensation	5,707	5,707		5,707
Subsidiary dividends to non-controlling interests	(451)							(451)
Balance at end of period, shares at Sep. 30, 2020			288,043
Balance at end of period, shares at Sep. 30, 2020							(46,088)
Balance at end of period at Sep. 30, 2020	2,222,737	2,194,618	$ 288	1,943,140	445,541	23,309	$ (217,660)	28,119
Balance at beginning of period, shares at Jun. 30, 2020			287,319
Balance at beginning of period, shares at Jun. 30, 2020							(46,083)
Balance at beginning of period at Jun. 30, 2020	2,116,928	2,089,404	$ 287	1,934,047	353,390	19,272	$ (217,592)	27,524
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	92,897	92,151			92,151			746
Other comprehensive income (loss)	4,037	4,037				4,037
Treasury stock acquired through surrender of shares for tax withholding, shares							(5)
Treasury stock acquired through surrender of shares for tax withholding	(68)	(68)					$ (68)
Issuance of stock through share-based compensation plans, shares			724
Issuance of stock through share-based compensation plans	6,954	6,954	$ 1	6,953
Share-based compensation	2,140	2,140		2,140
Subsidiary dividends to non-controlling interests	(151)							(151)
Balance at end of period, shares at Sep. 30, 2020			288,043
Balance at end of period, shares at Sep. 30, 2020							(46,088)
Balance at end of period at Sep. 30, 2020	$ 2,222,737	2,194,618	$ 288	1,943,140	445,541	23,309	$ (217,660)	28,119
Balance at beginning of period, shares at Dec. 31, 2020	288,923		288,923
Balance at beginning of period, shares at Dec. 31, 2020	(46,094)						(46,094)
Balance at beginning of period at Dec. 31, 2020	$ 2,353,959	2,325,699	$ 289	1,953,378	562,502	27,270	$ (217,740)	28,260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	428,324	426,469			426,469			1,855
Other comprehensive income (loss)	(11,334)	(11,334)				(11,334)
Treasury stock acquired through surrender of shares for tax withholding, shares							(57)
Treasury stock acquired through surrender of shares for tax withholding	(1,321)	(1,321)					$ (1,321)
Issuance of stock through share-based compensation plans, shares			1,418
Issuance of stock through share-based compensation plans	11,852	11,852	$ 1	11,851
Share-based compensation	7,978	7,978		7,978
Cash dividends declared	(29,330)	(29,330)			(29,330)
Subsidiary dividends to non-controlling interests	$ (449)							(449)
Balance at end of period, shares at Sep. 30, 2021	290,341		290,341
Balance at end of period, shares at Sep. 30, 2021	(46,151)						(46,151)
Balance at end of period at Sep. 30, 2021	$ 2,759,679	2,730,013	$ 290	1,973,207	959,641	15,936	$ (219,061)	29,666
Balance at beginning of period, shares at Jun. 30, 2021			290,115
Balance at beginning of period, shares at Jun. 30, 2021							(46,151)
Balance at beginning of period at Jun. 30, 2021	2,583,070	2,554,248	$ 290	1,968,339	788,567	16,113	$ (219,061)	28,822
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	181,847	180,854			180,854			993
Other comprehensive income (loss)	(177)	(177)				(177)
Issuance of stock through share-based compensation plans, shares			226
Issuance of stock through share-based compensation plans	1,828	1,828		1,828
Share-based compensation	3,040	3,040		3,040
Cash dividends declared	(9,780)	(9,780)			(9,780)
Subsidiary dividends to non-controlling interests	$ (149)							(149)
Balance at end of period, shares at Sep. 30, 2021	290,341		290,341
Balance at end of period, shares at Sep. 30, 2021	(46,151)						(46,151)
Balance at end of period at Sep. 30, 2021	$ 2,759,679	$ 2,730,013	$ 290	$ 1,973,207	$ 959,641	$ 15,936	$ (219,061)	$ 29,666

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in dollars per share)	$ 0.04	$ 0.12

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 428,324	$ 213,534
Depreciation and amortization	420,970	377,722
Other operating activities and non-cash items	22,222	20,368
Changes in assets and liabilities	(239,897)	(177,576)
Net cash provided by operating activities	631,619	434,048
Cash flows from investing activities:
Payments for property, plant and equipment	(491,425)	(275,531)
Proceeds from sale of property, plant and equipment	2,722	2,710
Proceeds from foreign exchange forward contracts	13,414	26,912
Payments for foreign exchange forward contracts	(51,296)	(13,666)
Payments for short-term investments	(348,822)	(475,696)
Proceeds from sale of short-term investments	70,085	37,633
Proceeds from maturities of short-term investments	165,774	86,216
Other investing activities	3,179	85
Net cash used in investing activities	(636,369)	(611,337)
Cash flows from financing activities:
Proceeds from revolving credit facilities	0	312,000
Payments of revolving credit facilities	0	(332,000)
Proceeds from short-term debt	15,514	86,769
Payments of short-term debt	(14,228)	(76,004)
Proceeds from issuance of long-term debt	154,784	225,985
Payments of long-term debt	(250,402)	(370,426)
Payments of finance lease obligations	(12,785)	(7,193)
Payments of dividends	(38,993)	0
Other financing activities	9,462	7,707
Net cash used in financing activities	(136,648)	(153,162)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(10,770)	2,696
Net decrease in cash, cash equivalents and restricted cash	(152,168)	(327,755)
Cash, cash equivalents and restricted cash, beginning of period	702,197	898,532
Cash, cash equivalents and restricted cash, end of period	550,029	570,777
Non-cash investing and financing activities:
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	58,625	2,726
Property, plant and equipment included in capital expenditures payable	393,781	328,354
Right of use assets acquired through operating lease liabilities	$ 39,916	$ 32,398

Interim Financial Statements

Interim Financial Statements	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Financial Statements	Interim Financial Statements Basis of Presentation. The Consolidated Financial Statements and related disclosures as of September 30, 2021, and for the three and nine months ended September 30, 2021 and 2020, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited, pursuant to the rules and regulations of the SEC. The December 31, 2020 Consolidated Balance Sheet data contained in this Form 10-Q 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 and should be read in conjunction with the financial statements included in the 2020 Form 10-K. The results of operations for the three and nine months ended September 30, 2021 are not necessarily indicative of the results to be expected for the full year ending December 31, 2021. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its subsidiaries. Certain prior year amounts have been reclassified to conform to current year presentation. 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, as a result of, for example, the impact of the Covid-19 pandemic and any worsening of the global business and economic environment. Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation. Unbilled Receivables . Total unbilled receivables as of September 30, 2021 and December 31, 2020 were $264.5 million and $146.8 million, respectively. Contract Liabilities. Contract liabilities were $109.6 million and $51.6 million as of September 30, 2021 and December 31, 2020, respectively. As of September 30, 2021 and December 31, 2020, the short-term portions of the liabilities were $61.6 million and $30.3 million, respectively. Revenue recognized during the nine months ended September 30, 2021 and 2020 that was included in the contract liabilities balance at the beginning of the period was $24.0 million and $12.5 million, respectively.

Net Sales by Product Group and

Net Sales by Product Group and End Market	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Net Sales by Product Group and End Market	Net Sales by Product Group and End Market The following table presents our net sales by product group. Beginning in 2021, we are reporting memory net sales in advanced products. Previously, memory net sales were reported in mainstream products. Prior year amounts were reclassified to conform to current year presentation. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) (In thousands) Advanced products (1) $ 1,235,753 $ 1,002,970 $ 3,136,076 $ 2,632,222 Mainstream products (2) 445,247 351,053 1,277,609 1,047,326 Total net sales $ 1,681,000 $ 1,354,023 $ 4,413,685 $ 3,679,548 (1) Advanced products include flip chip, memory and wafer-level processing and related test services. (2) Mainstream products include all other wirebond packaging and related test services. Net sales by end market consist of the following : For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Communications (handheld devices, smartphones, tablets) 43 % 43 % 41 % 40 % Consumer (connected home, set-top boxes, televisions, visual imaging, wearables) 22 % 25 % 22 % 25 % Automotive, industrial and other (driver assist, infotainment, performance, safety) 20 % 17 % 21 % 20 % Computing (data center, infrastructure, PC/laptop, storage) 15 % 15 % 16 % 15 % Total net sales 100 % 100 % 100 % 100 %

Other Income and Expense

Other Income and Expense	9 Months Ended
	Sep. 30, 2021
Other Income and Expenses [Abstract]
Other Income and Expense	Other Income and Expense Other income and expense consist of the following: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Interest income $ (256) $ (1,016) $ (765) $ (4,975) Foreign currency (gain) loss, net (53) 3,069 1,247 6,301 Loss on debt retirement — 491 — 919 Other (192) (129) (990) (678) Other (income) expense, net $ (501) $ 2,415 $ (508) $ 1,567

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense of $44.9 million for the nine months ended September 30, 2021 reflects income taxes, foreign withholding taxes and minimum taxes. 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 jurisdictions 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. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. 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. Gross unrecognized tax benefits decreased from $32.6 million at December 31, 2020 to $31.1 million as of September 30, 2021, primarily due to the lapse of statutes of limitations and settlement of examinations offset by increases related to income attribution. All of our unrecognized tax benefits would reduce our effective tax rate if recognized. Our unrecognized tax benefits are subject to change for effective settlement of examinations, changes in the recognition threshold of tax positions, the expiration of statutes of limitations and other factors. We have tax returns that are open to examination in various jurisdictions for tax years 2011-2020. The open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations related to the amount and/or timing of income, deductions and tax credits. There can be no assurance that the outcome of the

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share	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 is reduced for treasury stock. Diluted EPS is computed based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, performance-vested restricted stock units, time-vested restricted stock units and unvested restricted shares. The following table summarizes the computation of basic and diluted EPS: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands, Net income attributable to Amkor common stockholders $ 180,854 $ 92,151 $ 426,469 $ 211,464 Weighted-average number of common shares outstanding - basic 244,100 241,675 243,746 241,232 Effect of dilutive securities: Share-based awards 1,842 917 1,865 705 Weighted-average number of common shares outstanding - diluted 245,942 242,592 245,611 241,937 Net income attributable to Amkor per common share: Basic $ 0.74 $ 0.38 $ 1.75 $ 0.88 Diluted 0.74 0.38 1.74 0.87 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 anti-dilutive: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Share-based awards 180 858 90 2,943

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Changes in accumulated other comprehensive income (loss), net of tax, consist of the following: Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1) Defined Benefit Pension (2) Foreign Currency Translation Total (In thousands) Accumulated other comprehensive income (loss) at December 31, 2020 $ 21 $ (4,218) $ 31,467 $ 27,270 Other comprehensive income (loss) before reclassifications (221) — (11,264) (11,485) Amounts reclassified from accumulated other comprehensive income (loss) 74 77 — 151 Other comprehensive income (loss) (147) 77 (11,264) (11,334) Accumulated other comprehensive income (loss) at September 30, 2021 $ (126) $ (4,141) $ 20,203 $ 15,936 Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1) Defined Benefit Pension (2) Foreign Currency Translation Total (In thousands) Accumulated other comprehensive income (loss) at December 31, 2019 $ — $ (4,820) $ 23,935 $ 19,115 Other comprehensive income (loss) before reclassifications 168 — 3,967 $ 4,135 Amounts reclassified from accumulated other comprehensive income (loss) 25 34 — $ 59 Other comprehensive income (loss) 193 34 3,967 4,194 Accumulated other comprehensive income (loss) at September 30, 2020 $ 193 $ (4,786) $ 27,902 $ 23,309 (1) Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3). (2) Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

Investments

Investments	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Investments	Investments All of our available-for-sale debt investments as of September 30, 2021 are available to fund current operations and are recorded at fair value (Note 14). The following table summarizes our cash equivalents and available-for-sale debt investments: September 30, 2021 Fair Value Level Amortized Cost Gross Unrealized Gains Gross Unrealized Losses (1) Total Fair Value Level 1 Level 2 (In thousands) Cash equivalents Asset-backed securities $ 4 $ — $ — $ 4 $ — $ 4 Commercial paper 16,757 — — 16,757 — 16,757 Corporate bonds 5,908 — (1) 5,907 — 5,907 Money market funds 143,262 — — 143,262 143,262 — Total cash equivalents 165,931 — (1) 165,930 143,262 22,668 Short-term investments Asset-backed securities 23,155 2 (4) 23,153 — 23,153 Certificate of deposits 18,381 — — 18,381 18,381 — Commercial paper 23,112 — — 23,112 — 23,112 Corporate bonds 156,405 11 (165) 156,251 — 156,251 Municipal bonds 14,072 1 (1) 14,072 — 14,072 U.S. government bonds 4,120 — (1) 4,119 4,119 — Variable rate demand notes 700 — — 700 — 700 Total short-term investments 239,945 14 (171) 239,788 22,500 217,288 Total $ 405,876 $ 14 $ (172) $ 405,718 $ 165,762 $ 239,956 December 31, 2020 Fair Value Level Amortized Cost Gross Unrealized Gains Gross Unrealized Losses (1) Total Fair Value Level 1 Level 2 (In thousands) Cash equivalents Certificate of deposits $ 976 $ — $ — $ 976 $ 976 $ — Commercial paper 5,293 — — 5,293 — 5,293 Corporate bonds 1,744 — — 1,744 — 1,744 Money market funds 138,290 — — 138,290 138,290 — Municipal bonds 400 — — 400 — 400 Total cash equivalents 146,703 — — 146,703 139,266 7,437 Short-term investments Asset-backed securities 19,111 18 (9) 19,120 — 19,120 Certificate of deposits 5,046 — — 5,046 5,046 — Commercial paper 15,148 — — 15,148 — 15,148 Corporate bonds 50,771 16 (12) 50,775 — 50,775 Municipal bonds 12,702 8 (2) 12,708 — 12,708 U.S. government agency bonds 8,415 3 — 8,418 — 8,418 U.S. government bonds 17,605 3 — 17,608 17,608 — Variable rate demand notes 300 — — 300 — 300 Total short-term investments 129,098 48 (23) 129,123 22,654 106,469 Total $ 275,801 $ 48 $ (23) $ 275,826 $ 161,920 $ 113,906 (1) All unrealized losses have been in a continuous loss position for less than 12 months. We do not intend to sell the investments in an unrealized loss position, and it is not more likely than not that we will be required to sell these investments before recovery of their amortized cost bases. The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of September 30, 2021 : Amortized Cost Fair Value (In thousands) Within 1 year $ 320,948 $ 320,877 After 1 year through 5 years 82,992 82,905 After 5 years through 10 years 406 406 After 10 years 1,530 1,530 Total $ 405,876 $ 405,718 Actual maturities can differ from contractual maturities due to various factors including the issuers may have the right to call or prepay obligations without call or prepayment penalties. We view our available-for-sale debt investments as available for current operations.

Factoring of Accounts Receivabl

Factoring of Accounts Receivable	9 Months Ended
	Sep. 30, 2021
Factoring of Accounts Receivable [Abstract]
Factoring of Accounts Receivable	Factoring of Accounts Receivable For certain accounts receivable, we use non-recourse factoring arrangements with third-party financial institutions to manage our working capital and cash flows. Under these arrangements, 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, 2021, we sold receivables totaling $107.5 million and $319.4 million, net of discounts and fees of $0.2 million and $0.8 million, respectively. For the three and nine months ended September 30, 2020, we sold receivables totaling $103.9 million and $368.4 million, net of discounts and fees of $0.6 million and $2.2 million, respectively.

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant And Equipment	Property, Plant and Equipment Property, plant and equipment consist of the following: September 30, 2021 December 31, 2020 (In thousands) Land $ 219,081 $ 221,304 Buildings and improvements 1,644,211 1,625,355 Machinery and equipment 6,224,058 5,736,797 Finance lease assets 100,939 40,856 Software and computer equipment 231,890 231,171 Furniture, fixtures and other equipment 21,653 20,774 Construction in progress 126,279 48,602 Total property, plant and equipment 8,568,111 7,924,859 Accumulated depreciation and amortization (5,666,547) (5,358,857) Total property, plant and equipment, net $ 2,901,564 $ 2,566,002 The following table summarizes our depreciation expense: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Depreciation expense $ 145,826 $ 129,530 $ 420,503 $ 377,254

Accrued Expenses

Accrued Expenses	9 Months Ended
	Sep. 30, 2021
Payables and Accruals [Abstract]
Accrued Expenses	Accrued Expenses Accrued expenses consist of the following: September 30, 2021 December 31, 2020 (In thousands) Payroll and benefits $ 134,797 $ 143,383 Deferred revenue and customer advances 61,641 30,269 Short-term operating lease liabilities 56,054 49,748 Income taxes payable 41,470 26,602 Short-term finance lease liabilities 27,805 12,634 Accrued severance plan obligations 10,970 10,837 Accrued interest 1,979 10,767 Other accrued expenses 54,352 64,967 Total accrued expenses $ 389,068 $ 349,207

Debt

Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt Following is a summary of short-term borrowings and long-term debt: September 30, 2021 December 31, 2020 (In thousands) Debt of Amkor Technology, Inc.: Senior notes: 6.625% Senior notes, due September 2027 $ 525,000 $ 525,000 Other — 2,039 Debt of subsidiaries: Amkor Technology Korea, Inc.: (1) $30 million revolving credit facility, applicable bank rate plus 1.11% (2) — — Term loan, applicable bank rate plus 1.77%, due April 2023 47,294 51,541 Term loan, fixed rate at 1.85%, due April 2024 (3) — — Term loan, applicable bank rate plus 1.98%, due December 2028 50,000 50,000 Amkor Technology Japan, Inc.: Short-term term loans, variable rate (4) 9,740 6,663 Term loan, fixed rate at 0.86%, due June 2022 6,739 14,528 Term loan, fixed rate at 0.60%, due July 2022 1,797 3,390 Term loan, fixed rate at 1.30%, due July 2023 93,450 138,499 Term loan, fixed rate at 1.35%, due December 2024 166,457 220,823 Term loan, fixed rate at 1.20%, due December 2025 83,251 105,569 Amkor Assembly & Test (Shanghai) Co., Ltd.: Term loan, LIBOR plus 1.60%, due March 2022 — 28,000 Term loan, LIBOR plus 1.40%, due March 2022 — 18,250 Term loans, LIBOR plus 1.10%, due March 2024 (5) 49,000 — Other: $250.0 million senior secured revolving credit facility, LIBOR plus 1.25% - 1.75%, due July 2023 (Singapore) (6) — — Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (7) — — 1,032,728 1,164,302 Less: Unamortized discount and deferred debt costs, net (8,112) (9,956) Less: Short-term borrowings and current portion of long-term debt (140,380) (149,007) Long-term debt $ 884,236 $ 1,005,339 (1) In October 2021, we entered into a term loan agreement with availability of $200.0 million. The loan will mature seven years from the date of the first drawdown. Principal is payable in semiannual installments after a three-year grace period from the date of the first drawdown. Interest is payable quarterly at a fixed rate of 2.12%. (2) In October 2020, we renewed our revolving credit facility agreement for a one-year term with availability of $30.0 million. Principal is payable at maturity or six months after draw of funds, whichever is sooner, and interest is payable monthly in arrears. As of September 30, 2021, $30.0 million was available to be drawn. In October 2021, this revolving credit facility was renewed for one year with availability of $30.0 million. (3) In April 2021, we entered into a ₩80 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 1.85%. During the nine months ended September 30, 2021, we borrowed and repaid $104.8 million. As of September 30, 2021, ₩80.0 billion, or approximately $68 million, was available to be drawn. (4) We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. Interest as of September 30, 2021 is at an annual base rate equal to the Tokyo Interbank Offered Rate plus 0.15% to 0.30% (weighted average of 0.30% as of September 30, 2021). As of September 30, 2021, $5.4 million was available to be drawn. (5) In March 2021, we entered into a borrowing arrangement which includes a $20.0 million term loan and a $30.0 million term loan. For each term loan, principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity. We immediately borrowed $50.0 million to repay the term loans due March 2022. Interest is payable quarterly at an annual base rate equal to the London Interbank Offered Rate, as administered by the International Exchange Benchmark Administration (“LIBOR”), plus 1.10% (weighted average of 1.22% as of September 30, 2021). (6) In July 2018, our subsidiary, Amkor Technology Singapore Holding Pte. Ltd., entered into a $250.0 million senior secured revolving credit facility, which is guaranteed by Amkor Technology, Inc. (the “Singapore Revolver”). The availability for our future borrowings under the Singapore Revolver is based on the amount of eligible accounts receivable. Principal is payable at maturity. Interest is payable monthly at LIBOR plus 1.25% to 1.75%. As of September 30, 2021, $250.0 million was available for future borrowings under the Singapore Revolver. (7) In December 2019, our subsidiary, Amkor Technology Taiwan, Ltd., entered into a $56.0 million borrowing arrangement. This arrangement included a $20.0 million term loan and a $36.0 million revolving credit facility. As of September 30, 2021, $36.0 million was available for future borrowings under such credit facility. Certain of our foreign debt is collateralized by the land, buildings, equipment and accounts receivable in the respective locations. The carrying value of all collateral exceeds the carrying amount of the collateralized debt. 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. From time to time, Amkor Technology, Inc. and Amkor Technology Singapore Holding Pte. Ltd. guarantee certain debt of our subsidiaries. The agreements governing our indebtedness contain affirmative and negative covenants which restrict our ability to pay dividends and could restrict our operations. These restrictions are determined in part by calculations based upon cumulative net income or, in the case of our Singapore Revolver, borrowing availability, and do not currently have a material impact on our ability to make dividend payments or stock repurchases. We were in compliance with all debt covenants at September 30, 2021.

Pension Plans

Pension Plans	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Pension Plans	Pension Plans 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 pension plans are as follows: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Service cost $ 6,548 $ 7,722 $ 20,083 $ 22,803 Interest cost 1,199 1,281 3,682 3,774 Expected return on plan assets (1,384) (1,420) (4,247) (4,175) Recognized actuarial loss 32 14 96 42 Net periodic pension cost $ 6,395 $ 7,597 $ 19,614 $ 22,444 The components of net periodic pension cost other than the service cost component are included in other (income) expense, net in our Consolidated Statements of Income. Defined Contribution Pension Plans We sponsor defined contribution pension plans in Korea, Malaysia, Taiwan and the U.S. The following table summarizes our defined contribution expense: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Defined contribution expense $ 4,807 $ 3,618 $ 16,803 $ 12,159 Korean Severance Plan In October 2021, some employees accepted our offer to convert their Korean severance and defined benefit pension plan participation to a defined contribution plan. This will result in the conversion of approximately $20 million of obligations from our Korean severance plan to a defined contribution plan, which is expected to be funded during the fourth quarter of 2021.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives We use foreign currency forward contracts to mitigate foreign currency risk of certain monetary assets and liabilities denominated in foreign currencies. We do not enter into such contracts for trading or speculative purposes. These derivative instruments are not designated as hedging instruments. As of September 30, 2021 and December 31, 2020, our foreign exchange forward contracts consisted of the following: September 30, 2021 December 31, 2020 Notional Value Fair Value (Level 2) Balance Sheet Location Notional Value Fair Value (Level 2) Balance Sheet Location (In thousands) Japanese Yen $ 316,356 $ (555) Accrued expenses $ 465,192 $ 1,279 Other current assets Korean Won 207,033 108 Other current assets 161,612 190 Other current assets Philippine Peso 12,114 (60) Accrued expenses 10,974 (7) Accrued expenses Total forward contracts $ 535,503 $ (507) $ 637,778 $ 1,462 For the three and nine months ended September 30, 2021, the derivatives resulted in a net loss of $11.2 million and $47.0 million, respectively, which were offset by the foreign currency gains associated with the underlying net liabilities. For the three and nine months ended September 30, 2020, the derivatives resulted in a net gain of $12.9 million and $11.6 million, respectively, which were offset by the foreign currency losses associated with the underlying net liabilities.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	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. For our Level 2 short-term investments, we consider factors such as actual trade data, benchmark yields, broker/dealer quotes, and other similar data obtained from quoted market prices and independent pricing vendors to determine the fair value of these assets and liabilities. 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 certain other non-current assets and liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include restricted cash money market funds and short-term investments, including investments classified as cash equivalents. 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. Our derivative financial instruments are valued using quoted market prices for similar assets. Counterparties to these derivative contracts are highly rated financial institutions. We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis. We also review goodwill for impairment annually during the fourth quarter of each year. 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, 2021 December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value (In thousands) Senior notes (Level 1) $ 562,511 $ 520,273 $ 570,339 $ 519,803 Revolving credit facilities and term loans (Level 2) 513,394 504,343 647,557 634,543 Total debt $ 1,075,905 $ 1,024,616 $ 1,217,896 $ 1,154,346 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 facilities and term loans is calculated using a discounted cash flow analysis, which utilizes market-based assumptions including forward interest rates adjusted for credit risk.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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. Lease Commitments As of September 30, 2021, we have entered into additional lease agreements that have not yet commenced of approximately $50 million .

Restructuring and Related Activ

Restructuring and Related Activities	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Restructuring and Other Exit Activities	Restructuring and Other Exit Activities As part of our ongoing efforts to improve our manufacturing operations and manage costs, we regularly evaluate our staffing levels and facility requirements compared to business needs. The table below summarizes our exit activities associated with these efforts. “Charges” represents the initial charge related to the exit activity. “Cash Payments” consists of the utilization of “Charges.” “Non-cash Amounts” consists of asset impairment and translation adjustments. Japan Consolidation Activities During the nine months ended September 30, 2021, we recorded restructuring charges of $2.9 million associated with our Japan factory consolidation efforts. During the three and nine months ended September 30, 2020, we recorded restructuring charges of $5.7 million and $9.5 million, respectively, for the same consolidation efforts. We recorded these charges to selling, general and administrative expenses within the Consolidated Statements of Income. We completed these restructuring actions in the second quarter of 2021. Facility Costs (1) Employee Separation Costs Other Exit Costs (2) Total (In thousands) Accrual at December 31, 2020 $ 4,365 $ 1,759 $ 219 $ 6,343 Charges 2,077 496 360 2,933 Cash Payments (5,733) (2,253) (578) (8,564) Non-cash Amounts (709) (2) (1) (712) Accrual at September 30, 2021 $ — $ — $ — $ — Total cumulative charges incurred to date $ 16,255 $ 8,754 $ 3,884 $ 28,893 Estimated additional charges to be incurred — — — — Facility Costs (1) Employee Separation Costs Other Exit Costs (2) Total (In thousands) Accrual at December 31, 2019 $ 2,196 $ 271 $ 174 $ 2,641 Charges 5,129 2,637 1,717 9,483 Cash Payments (5,650) (1,370) (1,802) (8,822) Non-cash Amounts 4 8 (2) 10 Accrual at September 30, 2020 $ 1,679 $ 1,546 $ 87 $ 3,312 (1) Facility costs primarily consist of equipment relocation costs directly resulting from restructuring activities. (2) Other exit costs primarily consist of employee relocation and training costs directly resulting from restructuring activities.

Interim Financial Statements (P

Interim Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation. The Consolidated Financial Statements and related disclosures as of September 30, 2021, and for the three and nine months ended September 30, 2021 and 2020, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited, pursuant to the rules and regulations of the SEC. The December 31, 2020 Consolidated Balance Sheet data contained in this Form 10-Q 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 and should be read in conjunction with the financial statements included in the 2020 Form 10-K. The results of operations for the three and nine months ended September 30, 2021 are not necessarily indicative of the results to be expected for the full year ending December 31, 2021. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its subsidiaries.
Reclassifications	Certain prior year amounts have been reclassified to conform to current year presentation.
Use of Estimates	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, as a result of, for example, the impact of the Covid-19 pandemic and any worsening of the global business and economic environment.
Goodwill	Goodwill. The balance of goodwill in the Consolidated Balance Sheets contained in this Form 10-Q reflects adjustments for foreign currency translation.
Income Taxes	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 jurisdictions 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. We maintain a valuation allowance on certain U.S. and foreign deferred tax assets. 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.
Commitments and Contingencies	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.

Net Sales by Product Group an_2

Net Sales by Product Group and End Market (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Net sales by product group and end market	The following table presents our net sales by product group. Beginning in 2021, we are reporting memory net sales in advanced products. Previously, memory net sales were reported in mainstream products. Prior year amounts were reclassified to conform to current year presentation. For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) (In thousands) Advanced products (1) $ 1,235,753 $ 1,002,970 $ 3,136,076 $ 2,632,222 Mainstream products (2) 445,247 351,053 1,277,609 1,047,326 Total net sales $ 1,681,000 $ 1,354,023 $ 4,413,685 $ 3,679,548 (1) Advanced products include flip chip, memory and wafer-level processing and related test services. (2) Mainstream products include all other wirebond packaging and related test services. Net sales by end market consist of the following : For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 Communications (handheld devices, smartphones, tablets) 43 % 43 % 41 % 40 % Consumer (connected home, set-top boxes, televisions, visual imaging, wearables) 22 % 25 % 22 % 25 % Automotive, industrial and other (driver assist, infotainment, performance, safety) 20 % 17 % 21 % 20 % Computing (data center, infrastructure, PC/laptop, storage) 15 % 15 % 16 % 15 % Total net sales 100 % 100 % 100 % 100 %

Other Income and Expense (Table

Other Income and Expense (Tables)	9 Months Ended
	Sep. 30, 2021
Other Income and Expenses [Abstract]
Schedule of other income and expense	Other income and expense consist of the following: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Interest income $ (256) $ (1,016) $ (765) $ (4,975) Foreign currency (gain) loss, net (53) 3,069 1,247 6,301 Loss on debt retirement — 491 — 919 Other (192) (129) (990) (678) Other (income) expense, net $ (501) $ 2,415 $ (508) $ 1,567

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands, Net income attributable to Amkor common stockholders $ 180,854 $ 92,151 $ 426,469 $ 211,464 Weighted-average number of common shares outstanding - basic 244,100 241,675 243,746 241,232 Effect of dilutive securities: Share-based awards 1,842 917 1,865 705 Weighted-average number of common shares outstanding - diluted 245,942 242,592 245,611 241,937 Net income attributable to Amkor per common share: Basic $ 0.74 $ 0.38 $ 1.75 $ 0.88 Diluted 0.74 0.38 1.74 0.87
Summary of potential shares of common stock 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 anti-dilutive: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Share-based awards 180 858 90 2,943

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Changes in accumulated other comprehensive income (loss), net of tax	Changes in accumulated other comprehensive income (loss), net of tax, consist of the following: Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1) Defined Benefit Pension (2) Foreign Currency Translation Total (In thousands) Accumulated other comprehensive income (loss) at December 31, 2020 $ 21 $ (4,218) $ 31,467 $ 27,270 Other comprehensive income (loss) before reclassifications (221) — (11,264) (11,485) Amounts reclassified from accumulated other comprehensive income (loss) 74 77 — 151 Other comprehensive income (loss) (147) 77 (11,264) (11,334) Accumulated other comprehensive income (loss) at September 30, 2021 $ (126) $ (4,141) $ 20,203 $ 15,936 Unrealized Gains (Losses) on Available-for-Sale Debt Investments (1) Defined Benefit Pension (2) Foreign Currency Translation Total (In thousands) Accumulated other comprehensive income (loss) at December 31, 2019 $ — $ (4,820) $ 23,935 $ 19,115 Other comprehensive income (loss) before reclassifications 168 — 3,967 $ 4,135 Amounts reclassified from accumulated other comprehensive income (loss) 25 34 — $ 59 Other comprehensive income (loss) 193 34 3,967 4,194 Accumulated other comprehensive income (loss) at September 30, 2020 $ 193 $ (4,786) $ 27,902 $ 23,309 (1) Amounts reclassified out of accumulated other comprehensive income (loss) are included as other (income) expense, net (Note 3). (2) Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 12) or other (income) expense, net (Note 3).

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Summary of debt securities available-for-sale	The following table summarizes our cash equivalents and available-for-sale debt investments: September 30, 2021 Fair Value Level Amortized Cost Gross Unrealized Gains Gross Unrealized Losses (1) Total Fair Value Level 1 Level 2 (In thousands) Cash equivalents Asset-backed securities $ 4 $ — $ — $ 4 $ — $ 4 Commercial paper 16,757 — — 16,757 — 16,757 Corporate bonds 5,908 — (1) 5,907 — 5,907 Money market funds 143,262 — — 143,262 143,262 — Total cash equivalents 165,931 — (1) 165,930 143,262 22,668 Short-term investments Asset-backed securities 23,155 2 (4) 23,153 — 23,153 Certificate of deposits 18,381 — — 18,381 18,381 — Commercial paper 23,112 — — 23,112 — 23,112 Corporate bonds 156,405 11 (165) 156,251 — 156,251 Municipal bonds 14,072 1 (1) 14,072 — 14,072 U.S. government bonds 4,120 — (1) 4,119 4,119 — Variable rate demand notes 700 — — 700 — 700 Total short-term investments 239,945 14 (171) 239,788 22,500 217,288 Total $ 405,876 $ 14 $ (172) $ 405,718 $ 165,762 $ 239,956 December 31, 2020 Fair Value Level Amortized Cost Gross Unrealized Gains Gross Unrealized Losses (1) Total Fair Value Level 1 Level 2 (In thousands) Cash equivalents Certificate of deposits $ 976 $ — $ — $ 976 $ 976 $ — Commercial paper 5,293 — — 5,293 — 5,293 Corporate bonds 1,744 — — 1,744 — 1,744 Money market funds 138,290 — — 138,290 138,290 — Municipal bonds 400 — — 400 — 400 Total cash equivalents 146,703 — — 146,703 139,266 7,437 Short-term investments Asset-backed securities 19,111 18 (9) 19,120 — 19,120 Certificate of deposits 5,046 — — 5,046 5,046 — Commercial paper 15,148 — — 15,148 — 15,148 Corporate bonds 50,771 16 (12) 50,775 — 50,775 Municipal bonds 12,702 8 (2) 12,708 — 12,708 U.S. government agency bonds 8,415 3 — 8,418 — 8,418 U.S. government bonds 17,605 3 — 17,608 17,608 — Variable rate demand notes 300 — — 300 — 300 Total short-term investments 129,098 48 (23) 129,123 22,654 106,469 Total $ 275,801 $ 48 $ (23) $ 275,826 $ 161,920 $ 113,906 (1) All unrealized losses have been in a continuous loss position for less than 12 months. We do not intend to sell the investments in an unrealized loss position, and it is not more likely than not that we will be required to sell these investments before recovery of their amortized cost bases. The following table summarizes the contractual maturities of our cash equivalents and available-for-sale debt investments as of September 30, 2021 : Amortized Cost Fair Value (In thousands) Within 1 year $ 320,948 $ 320,877 After 1 year through 5 years 82,992 82,905 After 5 years through 10 years 406 406 After 10 years 1,530 1,530 Total $ 405,876 $ 405,718

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Summary of property, plant and equipment and depreciation expense	Property, plant and equipment consist of the following: September 30, 2021 December 31, 2020 (In thousands) Land $ 219,081 $ 221,304 Buildings and improvements 1,644,211 1,625,355 Machinery and equipment 6,224,058 5,736,797 Finance lease assets 100,939 40,856 Software and computer equipment 231,890 231,171 Furniture, fixtures and other equipment 21,653 20,774 Construction in progress 126,279 48,602 Total property, plant and equipment 8,568,111 7,924,859 Accumulated depreciation and amortization (5,666,547) (5,358,857) Total property, plant and equipment, net $ 2,901,564 $ 2,566,002 The following table summarizes our depreciation expense: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Depreciation expense $ 145,826 $ 129,530 $ 420,503 $ 377,254

Accrued Expenses (Tables)

Accrued Expenses (Tables)	9 Months Ended
	Sep. 30, 2021
Payables and Accruals [Abstract]
Summary of accrued expenses	Accrued expenses consist of the following: September 30, 2021 December 31, 2020 (In thousands) Payroll and benefits $ 134,797 $ 143,383 Deferred revenue and customer advances 61,641 30,269 Short-term operating lease liabilities 56,054 49,748 Income taxes payable 41,470 26,602 Short-term finance lease liabilities 27,805 12,634 Accrued severance plan obligations 10,970 10,837 Accrued interest 1,979 10,767 Other accrued expenses 54,352 64,967 Total accrued expenses $ 389,068 $ 349,207

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 December 31, 2020 (In thousands) Debt of Amkor Technology, Inc.: Senior notes: 6.625% Senior notes, due September 2027 $ 525,000 $ 525,000 Other — 2,039 Debt of subsidiaries: Amkor Technology Korea, Inc.: (1) $30 million revolving credit facility, applicable bank rate plus 1.11% (2) — — Term loan, applicable bank rate plus 1.77%, due April 2023 47,294 51,541 Term loan, fixed rate at 1.85%, due April 2024 (3) — — Term loan, applicable bank rate plus 1.98%, due December 2028 50,000 50,000 Amkor Technology Japan, Inc.: Short-term term loans, variable rate (4) 9,740 6,663 Term loan, fixed rate at 0.86%, due June 2022 6,739 14,528 Term loan, fixed rate at 0.60%, due July 2022 1,797 3,390 Term loan, fixed rate at 1.30%, due July 2023 93,450 138,499 Term loan, fixed rate at 1.35%, due December 2024 166,457 220,823 Term loan, fixed rate at 1.20%, due December 2025 83,251 105,569 Amkor Assembly & Test (Shanghai) Co., Ltd.: Term loan, LIBOR plus 1.60%, due March 2022 — 28,000 Term loan, LIBOR plus 1.40%, due March 2022 — 18,250 Term loans, LIBOR plus 1.10%, due March 2024 (5) 49,000 — Other: $250.0 million senior secured revolving credit facility, LIBOR plus 1.25% - 1.75%, due July 2023 (Singapore) (6) — — Credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) (7) — — 1,032,728 1,164,302 Less: Unamortized discount and deferred debt costs, net (8,112) (9,956) Less: Short-term borrowings and current portion of long-term debt (140,380) (149,007) Long-term debt $ 884,236 $ 1,005,339 (1) In October 2021, we entered into a term loan agreement with availability of $200.0 million. The loan will mature seven years from the date of the first drawdown. Principal is payable in semiannual installments after a three-year grace period from the date of the first drawdown. Interest is payable quarterly at a fixed rate of 2.12%. (2) In October 2020, we renewed our revolving credit facility agreement for a one-year term with availability of $30.0 million. Principal is payable at maturity or six months after draw of funds, whichever is sooner, and interest is payable monthly in arrears. As of September 30, 2021, $30.0 million was available to be drawn. In October 2021, this revolving credit facility was renewed for one year with availability of $30.0 million. (3) In April 2021, we entered into a ₩80 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 1.85%. During the nine months ended September 30, 2021, we borrowed and repaid $104.8 million. As of September 30, 2021, ₩80.0 billion, or approximately $68 million, was available to be drawn. (4) We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. Interest as of September 30, 2021 is at an annual base rate equal to the Tokyo Interbank Offered Rate plus 0.15% to 0.30% (weighted average of 0.30% as of September 30, 2021). As of September 30, 2021, $5.4 million was available to be drawn. (5) In March 2021, we entered into a borrowing arrangement which includes a $20.0 million term loan and a $30.0 million term loan. For each term loan, principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity. We immediately borrowed $50.0 million to repay the term loans due March 2022. Interest is payable quarterly at an annual base rate equal to the London Interbank Offered Rate, as administered by the International Exchange Benchmark Administration (“LIBOR”), plus 1.10% (weighted average of 1.22% as of September 30, 2021). (6) In July 2018, our subsidiary, Amkor Technology Singapore Holding Pte. Ltd., entered into a $250.0 million senior secured revolving credit facility, which is guaranteed by Amkor Technology, Inc. (the “Singapore Revolver”). The availability for our future borrowings under the Singapore Revolver is based on the amount of eligible accounts receivable. Principal is payable at maturity. Interest is payable monthly at LIBOR plus 1.25% to 1.75%. As of September 30, 2021, $250.0 million was available for future borrowings under the Singapore Revolver.

Pension Plans (Tables)

Pension Plans (Tables)	9 Months Ended
	Sep. 30, 2021
Retirement Benefits [Abstract]
Components of net periodic pension cost	The components of net periodic pension cost for these defined benefit pension plans are as follows: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Service cost $ 6,548 $ 7,722 $ 20,083 $ 22,803 Interest cost 1,199 1,281 3,682 3,774 Expected return on plan assets (1,384) (1,420) (4,247) (4,175) Recognized actuarial loss 32 14 96 42 Net periodic pension cost $ 6,395 $ 7,597 $ 19,614 $ 22,444
Summary of defined contribution expense	The following table summarizes our defined contribution expense: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (In thousands) Defined contribution expense $ 4,807 $ 3,618 $ 16,803 $ 12,159

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of derivative instruments in statement of financial position	As of September 30, 2021 and December 31, 2020, our foreign exchange forward contracts consisted of the following: September 30, 2021 December 31, 2020 Notional Value Fair Value (Level 2) Balance Sheet Location Notional Value Fair Value (Level 2) Balance Sheet Location (In thousands) Japanese Yen $ 316,356 $ (555) Accrued expenses $ 465,192 $ 1,279 Other current assets Korean Won 207,033 108 Other current assets 161,612 190 Other current assets Philippine Peso 12,114 (60) Accrued expenses 10,974 (7) Accrued expenses Total forward contracts $ 535,503 $ (507) $ 637,778 $ 1,462

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair value of financial instruments that are not recorded at fair value on recurring basis	The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis: September 30, 2021 December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value (In thousands) Senior notes (Level 1) $ 562,511 $ 520,273 $ 570,339 $ 519,803 Revolving credit facilities and term loans (Level 2) 513,394 504,343 647,557 634,543 Total debt $ 1,075,905 $ 1,024,616 $ 1,217,896 $ 1,154,346

Restructuring and Related Act_2

Restructuring and Related Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of restructuring reserve by type of cost	Facility Costs (1) Employee Separation Costs Other Exit Costs (2) Total (In thousands) Accrual at December 31, 2020 $ 4,365 $ 1,759 $ 219 $ 6,343 Charges 2,077 496 360 2,933 Cash Payments (5,733) (2,253) (578) (8,564) Non-cash Amounts (709) (2) (1) (712) Accrual at September 30, 2021 $ — $ — $ — $ — Total cumulative charges incurred to date $ 16,255 $ 8,754 $ 3,884 $ 28,893 Estimated additional charges to be incurred — — — — Facility Costs (1) Employee Separation Costs Other Exit Costs (2) Total (In thousands) Accrual at December 31, 2019 $ 2,196 $ 271 $ 174 $ 2,641 Charges 5,129 2,637 1,717 9,483 Cash Payments (5,650) (1,370) (1,802) (8,822) Non-cash Amounts 4 8 (2) 10 Accrual at September 30, 2020 $ 1,679 $ 1,546 $ 87 $ 3,312 (1) Facility costs primarily consist of equipment relocation costs directly resulting from restructuring activities. (2) Other exit costs primarily consist of employee relocation and training costs directly resulting from restructuring activities.

Interim Financial Statements (D

Interim Financial Statements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unbilled receivables	$ 264,500		$ 146,800
Contract liabilities	109,600		51,600
Deferred revenue and customer advances	61,641		$ 30,269
Revenue recognized	$ 24,000	$ 12,500

Net Sales by Product Group an_3

Net Sales by Product Group and End Market - Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales by product group	$ 1,681,000	$ 1,354,023	$ 4,413,685	$ 3,679,548
Advanced products
Disaggregation of Revenue [Line Items]
Net sales by product group	1,235,753	1,002,970	3,136,076	2,632,222
Mainstream products
Disaggregation of Revenue [Line Items]
Net sales by product group	$ 445,247	$ 351,053	$ 1,277,609	$ 1,047,326

Net Sales by Product Group an_4

Net Sales by Product Group and End Market - End Market (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer | End Market | Communications (handheld devices, smartphones, tablets)
Disaggregation of Revenue [Line Items]
Total net sales	43.00%	43.00%	41.00%	40.00%
Revenue from Contract with Customer | End Market | Consumer (connected home, set-top boxes, televisions, visual imaging, wearables)
Disaggregation of Revenue [Line Items]
Total net sales	22.00%	25.00%	22.00%	25.00%
Revenue from Contract with Customer | End Market | Automotive, industrial and other (driver assist, infotainment, performance, safety)
Disaggregation of Revenue [Line Items]
Total net sales	20.00%	17.00%	21.00%	20.00%
Revenue from Contract with Customer | End Market | Computing (data center, infrastructure, PC/laptop, storage)
Disaggregation of Revenue [Line Items]
Total net sales	15.00%	15.00%	16.00%	15.00%

Other Income and Expense (Detai

Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Interest income	$ (256)	$ (1,016)	$ (765)	$ (4,975)
Foreign currency (gain) loss, net	(53)	3,069	1,247	6,301
Loss on debt retirement	0	491	0	919
Other	(192)	(129)	(990)	(678)
Other (income) expense, net	$ (501)	$ 2,415	$ (508)	$ 1,567

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 17,219	$ 15,753	$ 44,875	$ 33,504
Gross unrecognized tax benefits	$ 31,100		$ 31,100		$ 32,600

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income attributable to Amkor common stockholders	$ 180,854	$ 92,151	$ 426,469	$ 211,464
Weighted-average number of common shares outstanding - basic	244,100	241,675	243,746	241,232
Effect of dilutive securities:
Share-based awards (in shares)	1,842	917	1,865	705
Weighted-average number of common shares outstanding - diluted	245,942	242,592	245,611	241,937
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.74	$ 0.38	$ 1.75	$ 0.88
Diluted (in dollars per share)	$ 0.74	$ 0.38	$ 1.74	$ 0.87

Earnings Per Share - Potential

Earnings Per Share - Potential Shares of Common Stock Excluded from Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share-based awards	180	858	90	2,943

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,583,070	$ 2,116,928	$ 2,353,959	$ 1,990,239
Other comprehensive income (loss) before reclassifications			(11,485)	4,135
Amounts reclassified from accumulated other comprehensive income (loss)			151	59
Total other comprehensive income (loss)	(177)	4,037	(11,334)	4,194
Balance at end of period	2,759,679	2,222,737	2,759,679	2,222,737
Unrealized Gains (Losses) on Available-for-Sale Debt Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			21	0
Other comprehensive income (loss) before reclassifications			(221)	168
Amounts reclassified from accumulated other comprehensive income (loss)			74	25
Total other comprehensive income (loss)			(147)	193
Balance at end of period	(126)	193	(126)	193
Defined Benefit Pension
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(4,218)	(4,820)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive income (loss)			77	34
Total other comprehensive income (loss)			77	34
Balance at end of period	(4,141)	(4,786)	(4,141)	(4,786)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			31,467	23,935
Other comprehensive income (loss) before reclassifications			(11,264)	3,967
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Total other comprehensive income (loss)			(11,264)	3,967
Balance at end of period	20,203	27,902	20,203	27,902
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	16,113	19,272	27,270	19,115
Total other comprehensive income (loss)	(177)	4,037	(11,334)	4,194
Balance at end of period	$ 15,936	$ 23,309	$ 15,936	$ 23,309

Investments - Summary of Short

Investments - Summary of Short term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 405,876	$ 275,801
Gross Unrealized Gains	14	48
Gross Unrealized Losses	(172)	(23)
Total Fair Value	405,718	275,826
Within 1 year, Amortized Cost	320,948
After 1 year through 5 years, Amortized Cost	82,992
After 5 years through 10 Years, Amortized Cost	406
After 10 Years, Amortized Cost	1,530
Within 1 year, Fair Value	320,877
After 1 year through 5 years, Fair Value	82,905
After 5 years through 10 years, Fair Value	406
After 10 Years, Fair Value	1,530
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	239,945	129,098
Gross Unrealized Gains	14	48
Gross Unrealized Losses	(171)	(23)
Total Fair Value	239,788	129,123
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,155	19,111
Gross Unrealized Gains	2	18
Gross Unrealized Losses	(4)	(9)
Total Fair Value	23,153	19,120
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,381	5,046
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	18,381	5,046
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,112	15,148
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	23,112	15,148
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	156,405	50,771
Gross Unrealized Gains	11	16
Gross Unrealized Losses	(165)	(12)
Total Fair Value	156,251	50,775
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,072	12,702
Gross Unrealized Gains	1	8
Gross Unrealized Losses	(1)	(2)
Total Fair Value	14,072	12,708
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		8,415
Gross Unrealized Gains		3
Gross Unrealized Losses		0
Total Fair Value		8,418
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,120	17,605
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(1)	0
Total Fair Value	4,119	17,608
Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	700	300
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	700	300
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	165,931	146,703
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Total Fair Value	165,930	146,703
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Total Fair Value	4
Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		976
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		976
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,757	5,293
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	16,757	5,293
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,908	1,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Total Fair Value	5,907	1,744
Money market funds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	143,262	138,290
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total Fair Value	143,262	138,290
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		400
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total Fair Value		400
Level 1
Debt Securities, Available-for-sale [Line Items]
Total	165,762	161,920
Level 1 | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	22,500	22,654
Level 1 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	18,381	5,046
Level 1 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 1 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	4,119	17,608
Level 1 | Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	143,262	139,266
Level 1 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0
Level 1 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		976
Level 1 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 1 | Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	143,262	138,290
Level 1 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2
Debt Securities, Available-for-sale [Line Items]
Total	239,956	113,906
Level 2 | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	217,288	106,469
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	23,153	19,120
Level 2 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	23,112	15,148
Level 2 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	156,251	50,775
Level 2 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	14,072	12,708
Level 2 | U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		8,418
Level 2 | U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	0	0
Level 2 | Variable rate demand notes
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	700	300
Level 2 | Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	22,668	7,437
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	4
Level 2 | Certificate of deposits
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		0
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	16,757	5,293
Level 2 | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	5,907	1,744
Level 2 | Money market funds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value	$ 0	0
Level 2 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total Fair Value		$ 400

Investments - Valuation (Detail

Investments - Valuation (Details) - Level 1 - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost of held-to-maturity securities	$ 4.7	$ 4.7
Fair market value of held-to-maturity securities	$ 4.7	$ 4.7

Factoring of Accounts Receiva_2

Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 107.5	$ 103.9	$ 319.4	$ 368.4
Discounts and Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 0.2	$ 0.6	$ 0.8	$ 2.2

Property, Plant and Equipment -

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Finance lease assets	$ 100,939	$ 40,856
Total property, plant and equipment	8,568,111	7,924,859
Accumulated depreciation and amortization	(5,666,547)	(5,358,857)
Total property, plant and equipment, net	2,901,564	2,566,002
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	219,081	221,304
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,644,211	1,625,355
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	6,224,058	5,736,797
Software and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	231,890	231,171
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	21,653	20,774
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 126,279	$ 48,602

Property, Plant and Equipment_2

Property, Plant and Equipment - Summary of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 145,826	$ 129,530	$ 420,503	$ 377,254

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Payroll and benefits	$ 134,797	$ 143,383
Deferred revenue and customer advances	61,641	30,269
Short-term operating lease liabilities	$ 56,054	$ 49,748
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total accrued expenses	Total accrued expenses
Income taxes payable	$ 41,470	$ 26,602
Short-term finance lease liabilities	$ 27,805	$ 12,634
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total accrued expenses	Total accrued expenses
Accrued severance plan obligations	$ 10,970	$ 10,837
Accrued interest	1,979	10,767
Other accrued expenses	54,352	64,967
Total accrued expenses	$ 389,068	$ 349,207

Debt (Details)

Debt (Details)	1 Months Ended			9 Months Ended
	Oct. 31, 2021USD ($)	Mar. 31, 2021USD ($)	Oct. 31, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2021KRW (₩)	Apr. 30, 2021KRW (₩)borrowing	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jul. 31, 2018USD ($)
Debt Instrument [Line Items]
Long-term Debt				$ 1,032,728,000			$ 1,164,302,000
Less: Unamortized discount and deferred debt costs, net				(8,112,000)			(9,956,000)
Less: Short-term borrowings and current portion of long-term debt				(140,380,000)			(149,007,000)
Long-term debt				884,236,000			1,005,339,000
Senior Notes | 6.625% Senior notes, due September 2027
Debt Instrument [Line Items]
Debt				$ 525,000,000			525,000,000
Stated interest rate (as a percent)				6.625%	6.625%
Subsidiary Term Loans
Debt Instrument [Line Items]
Debt				$ 0			2,039,000
Subsidiary Term Loans | Term loan, applicable bank rate plus 1.77%, due April 2023 | Korea
Debt Instrument [Line Items]
Debt				$ 47,294,000			51,541,000
Subsidiary Term Loans | Term loan, applicable bank rate plus 1.77%, due April 2023 | Korea | Applicable Bank Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.77%
Subsidiary Term Loans | Term Loan Due April 2024 | Korea
Debt Instrument [Line Items]
Debt				$ 0			0
Stated interest rate (as a percent)				1.85%	1.85%
Unused borrowing capacity				$ 68,000,000	₩ 80,000,000,000
Face amount of debt | ₩						₩ 80,000,000,000
Number of annual borrowings | borrowing						6
Payments of long-term debt				104,800,000
Proceeds from issuance of long-term debt				104,800,000
Subsidiary Term Loans | Term loan, applicable bank rate plus 1.98%, due December 2028 | Korea
Debt Instrument [Line Items]
Debt				$ 50,000,000			50,000,000
Subsidiary Term Loans | Term loan, applicable bank rate plus 1.98%, due December 2028 | Korea | Applicable Bank Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.98%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan
Debt Instrument [Line Items]
Debt				$ 9,740,000			6,663,000
Unused borrowing capacity				$ 5,400,000
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | Weighted Average
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)				0.30%	0.30%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | TIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.15%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | TIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.30%
Subsidiary Term Loans | Term loan, fixed rate at 0.86%, due June 2022 | Japan
Debt Instrument [Line Items]
Debt				$ 6,739,000			14,528,000
Stated interest rate (as a percent)				0.86%	0.86%
Subsidiary Term Loans | Term loan, fixed rate at 0.60%, due July 2022 | Japan
Debt Instrument [Line Items]
Debt				$ 1,797,000			3,390,000
Stated interest rate (as a percent)				0.60%	0.60%
Subsidiary Term Loans | Term loan, fixed rate at 1.30%, due July 2023 | Japan
Debt Instrument [Line Items]
Debt				$ 93,450,000			138,499,000
Stated interest rate (as a percent)				1.30%	1.30%
Subsidiary Term Loans | Term loan, fixed rate at 1.35%, due December 2024 | Japan
Debt Instrument [Line Items]
Debt				$ 166,457,000			220,823,000
Stated interest rate (as a percent)				1.35%	1.35%
Subsidiary Term Loans | Term Loan, Fixed Rate at 1.20% Due December 2025 | Japan
Debt Instrument [Line Items]
Debt				$ 83,251,000			105,569,000
Stated interest rate (as a percent)				1.20%	1.20%
Subsidiary Term Loans | Term loan, LIBOR plus 1.60%, due March 2022 | China
Debt Instrument [Line Items]
Debt				$ 0			28,000,000
Subsidiary Term Loans | Term loan, LIBOR plus 1.60%, due March 2022 | China | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.60%
Subsidiary Term Loans | Term Loan, LIBOR plus 1.40% due March 2022 | China
Debt Instrument [Line Items]
Debt				$ 0			18,250,000
Subsidiary Term Loans | Term Loan, LIBOR plus 1.40% due March 2022 | China | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.40%
Subsidiary Term Loans | Term Loan, LIBOR plus 1.10% Due March 2024 | China
Debt Instrument [Line Items]
Debt				$ 49,000,000			0
Subsidiary Term Loans | Term Loan, LIBOR plus 1.10% Due March 2024 | China | Weighted Average
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)				1.22%	1.22%
Subsidiary Term Loans | Term Loan, LIBOR plus 1.10% Due March 2024 | China | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.10%
Proceeds from issuance of long-term debt		$ 50,000,000
Subsidiary Term Loans | Term Loan One, LIBOR plus 1.10% Due March 2024 | China
Debt Instrument [Line Items]
Periodic principal payment		500,000
Subsidiary Term Loans | Term Loan One, LIBOR plus 1.10% Due March 2024 | China | LIBOR
Debt Instrument [Line Items]
Face amount of debt		20,000,000
Subsidiary Term Loans | Term Loan Two, LIBOR plus 1.10% Due March 2024 | China
Debt Instrument [Line Items]
Periodic principal payment		500,000
Subsidiary Term Loans | Term Loan Two, LIBOR plus 1.10% Due March 2024 | China | LIBOR
Debt Instrument [Line Items]
Face amount of debt		$ 30,000,000
Subsidiary Term Loans | Revolving credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) | Revolving Credit Facility | Taiwan
Debt Instrument [Line Items]
Face amount of debt								$ 20,000,000
Subsidiary Term Loans | Term Loan Due Seven Years from Initial Draw | Korea | Subsequent Event
Debt Instrument [Line Items]
Stated interest rate (as a percent)	2.12%
Renewal term	7 years
Face amount of debt	$ 200,000,000
Line of Credit | Revolving Credit Facility | Korea
Debt Instrument [Line Items]
Debt				$ 0			0
Credit facility, borrowing capacity			$ 30,000,000
Basis spread on variable rate (as a percent)				1.11%
Renewal term			1 year
Payment term			6 months
Unused borrowing capacity				$ 30,000,000
Line of Credit | Revolving Credit Facility | Korea | Subsequent Event
Debt Instrument [Line Items]
Credit facility, borrowing capacity	$ 30,000,000
Line of Credit | $250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility
Debt Instrument [Line Items]
Remaining borrowing capacity				250,000,000
Line of Credit | $250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility | Singapore
Debt Instrument [Line Items]
Debt				$ 0			0
Credit facility, borrowing capacity									$ 250,000,000
Line of Credit | $250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility | Singapore | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.25%
Line of Credit | $250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility | Singapore | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.75%
Line of Credit | Revolving credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) | Revolving Credit Facility | Taiwan
Debt Instrument [Line Items]
Debt				$ 0			$ 0
Credit facility, borrowing capacity								36,000,000
Unused borrowing capacity				$ 36,000,000
Revolving credit facilities and term loans | Revolving credit facility, TAIFX plus the applicable bank rate, due December 2024 (Taiwan) | Revolving Credit Facility | Taiwan
Debt Instrument [Line Items]
Long-term Debt								$ 56,000,000

Pension Plans - Components of N

Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 6,548	$ 7,722	$ 20,083	$ 22,803
Interest cost	1,199	1,281	3,682	3,774
Expected return on plan assets	(1,384)	(1,420)	(4,247)	(4,175)
Recognized actuarial loss	32	14	96	42
Net periodic pension cost	$ 6,395	$ 7,597	$ 19,614	$ 22,444

Pension Plans - Summary of Defi

Pension Plans - Summary of Defined Contribution Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
Defined contribution expense	$ 4,807	$ 3,618	$ 16,803	$ 12,159

Pension Plans (Details)

Pension Plans (Details) - Subsequent Event - Korea - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Oct. 31, 2021
Defined Contribution Plan Disclosure [Line Items]
Conversion of severance plan obligation to defined contribution liability		$ 20
Payment for Pension and Other Postretirement Benefits	$ 20

Derivatives (Details)

Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Net gain (loss) on derivatives	$ 11,200	$ 12,900	$ 47,000	$ 11,600
Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Notional Value	535,503		535,503		$ 637,778
Foreign Exchange Forward | Level 2
Derivatives, Fair Value [Line Items]
Fair value	(507)		(507)		1,462
Foreign Exchange Forward | Japanese Yen
Derivatives, Fair Value [Line Items]
Notional Value	316,356		316,356		465,192
Foreign Exchange Forward | Japanese Yen | Accrued expenses | Level 2
Derivatives, Fair Value [Line Items]
Fair value	(555)		(555)
Foreign Exchange Forward | Japanese Yen | Other current assets | Level 2
Derivatives, Fair Value [Line Items]
Fair value					1,279
Foreign Exchange Forward | Korean Won
Derivatives, Fair Value [Line Items]
Notional Value	207,033		207,033		161,612
Foreign Exchange Forward | Korean Won | Other current assets | Level 2
Derivatives, Fair Value [Line Items]
Fair value	108		108		190
Foreign Exchange Forward | Philippine Peso
Derivatives, Fair Value [Line Items]
Notional Value	12,114		12,114		10,974
Foreign Exchange Forward | Philippine Peso | Accrued expenses | Level 2
Derivatives, Fair Value [Line Items]
Fair value	$ (60)		$ (60)		$ (7)

Fair Value Measurements - Instr

Fair Value Measurements - Instruments Not Recorded on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,075,905	$ 1,217,896
Fair Value | Senior notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	562,511	570,339
Fair Value | Revolving credit facilities and term loans | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	513,394	647,557
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,024,616	1,154,346
Carrying Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	520,273	519,803
Carrying Value | Revolving credit facilities and term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 504,343	$ 634,543

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Sep. 30, 2021USD ($)
Commitments and Contingencies Disclosure [Abstract]
Amount of leases not yet commenced	$ 50

Restructuring and Related Act_3

Restructuring and Related Activities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Charges		$ 2,933	$ 9,483
Japan Consolidation Activities
Restructuring Cost and Reserve [Line Items]
Charges	$ 5,700	$ 2,900	$ 9,500

Restructuring and Related Act_4

Restructuring and Related Activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Accrual beginning balance	$ 6,343	$ 2,641
Charges	2,933	9,483
Cash Payments	(8,564)	(8,822)
Non-cash Amounts	(712)	10
Accrual ending balance	0	3,312
Total cumulative charges incurred to date	28,893
Estimated additional charges to be incurred	0
Facility Costs
Restructuring Reserve [Roll Forward]
Accrual beginning balance	4,365	2,196
Charges	2,077	5,129
Cash Payments	(5,733)	(5,650)
Non-cash Amounts	(709)	4
Accrual ending balance	0	1,679
Total cumulative charges incurred to date	16,255
Estimated additional charges to be incurred	0
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Accrual beginning balance	1,759	271
Charges	496	2,637
Cash Payments	(2,253)	(1,370)
Non-cash Amounts	(2)	8
Accrual ending balance	0	1,546
Total cumulative charges incurred to date	8,754
Estimated additional charges to be incurred	0
Other Exit Costs
Restructuring Reserve [Roll Forward]
Accrual beginning balance	219	174
Charges	360	1,717
Cash Payments	(578)	(1,802)
Non-cash Amounts	(1)	(2)
Accrual ending balance	0	$ 87
Total cumulative charges incurred to date	3,884
Estimated additional charges to be incurred	$ 0