10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the Quarterly Period Ended March 31, 2019
or
¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from          to

Commission File Number 000-29472

AMKOR TECHNOLOGY, INC.

(Exact name of registrant as specified in its charter)

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

2045 East Innovation Circle

Tempe, AZ 85284

(Address of principal executive offices and zip code)

(480) 821-5000

(Registrant’s telephone number, including area code)

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

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

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934, during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to filing requirements for the past 90 days.  Yes þ  No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes þ  No o

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

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

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

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

The number of outstanding shares of the registrant’s Common Stock as of April 26, 2019 was 239,627,109.

QUARTERLY REPORT ON FORM 10-Q

For the Quarter Ended March 31, 2019

TABLE OF CONTENTS

		Page
PART I. Financial Information
Item 1.	Financial Statements (unaudited)	2
	Consolidated Statements of Income - Three Months Ended March 31, 2019 and 2018	2
	Consolidated Statements of Comprehensive Income - Three Months Ended March 31, 2019 and 2018	3
	Consolidated Balance Sheets - March 31, 2019 and December 31, 2018	4
	Consolidated Statements of Stockholders’ Equity — Three Months Ended March 31, 2019 and 2018	5
	Condensed Consolidated Statements of Cash Flows - Three Months Ended March 31, 2019 and 2018	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	18
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	25
Item 4.	Controls and Procedures	26
PART II. Other Information
Item 1.	Legal Proceedings	27
Item 1A.	Risk Factors	27
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	43
Item 3.	Defaults Upon Senior Securities	43
Item 4.	Mine Safety Disclosures	43
Item 5.	Other Information	43
Item 6.	Exhibits	44
Signatures		45

This report contains forward-looking statements within the meaning of the federal securities laws, including but not limited to statements regarding: (1) the amount, timing and focus of our expected capital investments in 2019 including expenditures in support of advanced packaging and test equipment, (2) our ability to fund our operating activities and financial requirements for the next twelve months, (3) the effect of changes in revenue levels and capacity utilization on our gross margin, (4) the focus of our research and development activities, (5) the anticipated impact of the Tax Cuts and Jobs Act (the "Tax Act") on our taxes, (6) the grant and expiration of tax holidays in jurisdictions in which we operate and expectations regarding our effective tax rate and the availability of tax incentives, (7) the creation or release of valuation allowances related to taxes in the future, (8) our repurchase or repayment of outstanding debt or the conversion of debt in the future, (9) payment of dividends, (10) compliance with our covenants, (11) expected contributions to foreign pension plans, (12) liability for unrecognized tax benefits and the potential impact of our unrecognized tax benefits on our effective tax rate, (13) the effect of foreign currency exchange rate exposure on our financial results, (14) the volatility of the trading price of our common stock, (15) changes to our internal controls related to integration of acquired operations and implementation of an enterprise resource planning system, (16) our efforts to enlarge our customer base in certain geographic areas and markets, (17) demand for advanced packages in mobile and automotive devices and our technology leadership and potential growth in this market, and (18) other statements that are not historical facts. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” “intend” or the negative of these terms or other comparable terminology. Because such statements include risks and uncertainties, actual results may differ materially from those anticipated in such forward-looking statements as a result of various factors, including those set forth in the following report as well as in Part II, Item 1A of this Quarterly Report on Form 10-Q.

-1-

PART I. FINANCIAL INFORMATION

Item 1.        Financial Statements

AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	For the Three Months Ended March 31,
	2019			2018
	(In thousands, except per share data)
Net sales	$	894,964		$	1,025,319
Cost of sales	774,203			867,548
Gross profit	120,761			157,771
Selling, general and administrative	71,587			80,723
Research and development	35,754			40,929
Total operating expenses	107,341			121,652
Operating income	13,420			36,119
Interest expense	19,273			20,011
Other (income) expense, net	(4,565		)	3,432
Total other expense, net	14,708			23,443
Income (loss) before taxes	(1,288		)	12,676
Income tax expense	21,380			2,481
Net income (loss)	(22,668		)	10,195
Net income attributable to non-controlling interests	(211		)	(651		)
Net income (loss) attributable to Amkor	$	(22,879	)	$	9,544
Net income (loss) attributable to Amkor per common share:
Basic	$	(0.10	)	$	0.04
Diluted	$	(0.10	)	$	0.04
Shares used in computing per common share amounts:
Basic	239,414			239,214
Diluted	239,414			239,816

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Net income (loss)	$	(22,668	)	$	10,195
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans	(132		)	(39		)
Foreign currency translation	(2,224		)	15,091
Total other comprehensive income (loss)	(2,356		)	15,052
Comprehensive income (loss)	(25,024		)	25,247
Comprehensive income attributable to non-controlling interests	(211		)	(651		)
Comprehensive income (loss) attributable to Amkor	$	(25,235	)	$	24,596

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED BALANCE SHEETS

(Unaudited)

	March 31, 2019			December 31, 2018
	(In thousands, except per share data)
ASSETS
Current assets:
Cash and cash equivalents	$	1,055,402		$	681,569
Restricted cash	2,589			2,589
Accounts receivable, net of allowances	684,914			724,456
Inventories	227,502			230,589
Other current assets	32,522			32,005
Total current assets	2,002,929			1,671,208
Property, plant and equipment, net	2,564,177			2,650,448
Operating lease right of use asset	122,982			—
Goodwill	25,449			25,720
Restricted cash	2,929			3,893
Other assets	128,720			144,178
Total assets	$	4,847,186		$	4,495,447
LIABILITIES AND EQUITY
Current liabilities:
Short-term borrowings and current portion of long-term debt	$	638,702		$	114,579
Trade accounts payable	459,383			530,398
Capital expenditures payable	123,737			255,237
Accrued expenses	245,796			258,209
Total current liabilities	1,467,618			1,158,423
Long-term debt	1,215,262			1,217,732
Pension and severance obligations	181,826			184,321
Long-term operating lease liability	73,876			—
Other non-current liabilities	76,022			79,071
Total liabilities	3,014,604			2,639,547
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	—			—
Common stock, $0.001 par value, 500,000 shares authorized; 285,430 and 285,352 shares issued; and 239,458 and 239,385 shares outstanding in 2019 and 2018, respectively	285			285
Additional paid-in capital	1,911,179			1,909,425
Retained earnings	90,310			113,189
Accumulated other comprehensive income (loss)	21,456			23,812
Treasury stock, at cost, 45,972 and 45,967 shares, in 2019 and 2018, respectively	(216,219		)	(216,171		)
Total Amkor stockholders’ equity	1,807,011			1,830,540
Non-controlling interests in subsidiaries	25,571			25,360
Total equity	1,832,582			1,855,900
Total liabilities and equity	$	4,847,186		$	4,495,447

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(Unaudited)

				Additional Paid- In Capital		Retained Earnings (Accumulated Deficit)			Accumulated Other Comprehensive Income (Loss)								Total Amkor Stockholders' Equity			Noncontrolling Interest in Subsidiaries			Total Equity
	Common Stock											Treasury Stock
	Shares	Par Value										Shares		Cost
	(In thousands)
Balance at December 31, 2018	285,352	$	285	$	1,909,425	$	113,189		$	23,812		(45,967	)	$	(216,171	)	$	1,830,540		$	25,360		$	1,855,900
Net income (loss)	—	—		—		(22,879		)	—			—		—			(22,879		)	211			(22,668		)
Other comprehensive income (loss)	—	—		—		—			(2,356		)	—		—			(2,356		)	—			(2,356		)
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(5	)	(48		)	(48		)	—			(48		)
Issuance of stock through share-based compensation plans	78	—		286		—			—			—		—			286			—			286
Share-based compensation	—	—		1,468		—			—			—		—			1,468			—			1,468
Balance at March 31, 2019	285,430	$	285	$	1,911,179	$	90,310		$	21,456		(45,972	)	$	(216,219	)	$	1,807,011		$	25,571		$	1,832,582
Balance at December 31, 2017	285,129	285		1,903,357		(13,903		)	22,519			(45,945	)	(215,982		)	1,696,276			23,433			1,719,709
Net income	—	—		—		9,544			—			—		—			9,544			651			10,195
Other comprehensive income (loss)	—	—		—		—			15,052			—		—			15,052			—			15,052
Treasury stock acquired through surrender of shares for tax withholding	—	—		—		—			—			(5	)	(56		)	(56		)	—			(56		)
Issuance of stock through share-based compensation plans	155	—		1,022		—			—			—		—			1,022			—			1,022
Share-based compensation	—	—		1,287		—			—			—		—			1,287			—			1,287
Subsidiary dividends to noncontrolling interests	—	—		—		—			—			—		—			—			(135		)	(135		)
Balance at March 31, 2018	285,284	$	285	$	1,905,666	$	(4,359	)	$	37,571		(45,950	)	$	(216,038	)	$	1,723,125		$	23,949		$	1,747,074

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Cash flows from operating activities:
Net income (loss)	$	(22,668	)	$	10,195
Depreciation and amortization	135,835			142,509
Other operating activities and non-cash items	15,928			(4,734		)
Changes in assets and liabilities	(77,038		)	(339		)
Net cash provided by operating activities	52,057			147,631
Cash flows from investing activities:
Payments for property, plant and equipment	(203,216		)	(230,603		)
Proceeds from sale of property, plant and equipment	180			342
Proceeds from insurance recovery for property, plant and equipment	1,538			—
Other investing activities	(569		)	656
Net cash used in investing activities	(202,067		)	(229,605		)
Cash flows from financing activities:
Proceeds from short-term debt	29,781			—
Payments of short-term debt	(10,588		)	(17,352		)
Proceeds from issuance of long-term debt	572,375			—
Payments of long-term debt	(63,636		)	(6,220		)
Payments of finance lease obligations	(1,376		)	(808		)
Other financing activities	(2,848		)	455
Net cash provided by (used in) financing activities	523,708			(23,925		)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(829		)	3,892
Net increase (decrease) in cash, cash equivalents and restricted cash	372,869			(102,007		)
Cash, cash equivalents and restricted cash, beginning of period	688,051			602,851
Cash, cash equivalents and restricted cash, end of period	$	1,060,920		$	500,844
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	$	124,547		$	224,037
Right of use assets acquired through finance lease liabilities	92			923
Right of use assets acquired through operating lease liabilities	7,328			—

The accompanying notes are an integral part of these statements.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1.    Interim Financial Statements

Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2019, and for the three months ended March 31, 2019 and 2018, are unaudited, pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). The December 31, 2018, Consolidated Balance Sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S.”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. In our opinion, these financial statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods. These financial statements should be read in conjunction with the financial statements included in our Annual Report for the year ended December 31, 2018, filed on Form 10-K with the SEC on February 22, 2019. The results of operations for the three months ended March 31, 2019, are not necessarily indicative of the results to be expected for the full year. Unless the context otherwise requires, all references to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and our subsidiaries.

Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments.

Goodwill. The balance of goodwill in our Consolidated Balance Sheets reflects adjustments for foreign currency translation.

Unbilled Receivables. Total unbilled receivables as of March 31, 2019 and December 31, 2018 were $82.6 million and $89.3 million, respectively.

2.    New Accounting Standards

Recently Adopted Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which was subsequently amended and clarified. Topic 842 requires a dual approach for lease accounting under which a lessee would account for leases as finance leases or operating leases. The standard also requires the lessee to recognize a right-of-use asset and a corresponding lease liability for both finance leases and operating leases. For finance leases, the lessee recognizes interest expense and amortization of the right-of-use asset, and for operating leases, the lessee recognizes a straight-line lease expense. The standard permits the use of two alternative transition approaches, either with application in all comparative periods presented, or with application beginning with the effective date without restating comparative period financial statements.

Effective January 1, 2019, we adopted the requirements of Topic 842 using the modified transition approach without restating the comparative period financial statements. The new standard resulted in increases in our operating lease right of use asset, accrued expenses and long-term operating lease liability account balances to record our operating leases on our Consolidated Balance Sheet. The new standard also resulted in additional disclosures for our operating and finance leases (Note 10).

In accordance with Topic 842, we applied practical expedients permitted under the transition guidance, which allowed us to not:

• Reassess whether any existing contracts are or contain a lease,

• Reassess the lease classification for any existing contracts,

• Reassess initial direct costs for any existing leases, and

• Separate non-lease components from lease components and instead to account for them as a single lease component for all asset classes.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

3.Net Sales by Product Group and End Market

Net sales by product group consist of the following:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Advanced products (1)	$	422,446	$	475,752
Mainstream products (2)	472,518		549,567
Total net sales	$	894,964	$	1,025,319

(1) Advanced products include flip chip and wafer-level processing and related test services

(2) Mainstream products include wirebond packaging and related test services

Net sales by end market consist of the following:

	For the Three Months Ended March 31,
	2019		2018
Communications (smartphones, tablets, handheld devices)	38	%	42	%
Automotive, industrial and other (driver assist, infotainment, safety, performance)	28	%	26	%
Computing (datacenter, infrastructure, PC/laptop, storage)	20	%	19	%
Consumer (set-top boxes, televisions, connected home, personal electronics, visual imaging)	14	%	13	%
Total net sales	100	%	100	%

4.Other Income and Expense

Other income and expense consists of the following:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Interest income	$	(2,064	)	$	(988	)
Foreign currency (gain) loss, net	(2,013		)	4,713
Other	(488		)	(293		)
Other (income) expense, net	$	(4,565	)	$	3,432

5.    Income Taxes

Income tax expense of $21.4 million for the three months ended March 31, 2019 reflects income taxes, foreign withholding taxes and minimum taxes. Income tax expense for the three months ended March 31, 2019 also includes a $14.9 million non-cash discrete tax expense primarily for the recognition of a valuation allowance for certain deferred tax assets.

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. Based on current projections of future taxable income in

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

foreign jurisdictions, foreign deferred tax assets of $14.9 million are not expected to be realized, including certain tax credit carryforwards that are expected to expire unused.

We maintain a valuation allowance on a portion of our U.S. net deferred tax assets for deferred interest expense carryforwards, net operating loss carryforwards and foreign tax credit carryforwards that are expected to expire unused. 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 were $25.3 million at December 31, 2018 and $25.2 million as of March 31, 2019. 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. Tax return examinations involve uncertainties, and there can be no assurance that the outcome of examinations will be favorable.

6.    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 and unvested restricted shares.

The following table summarizes the computation of basic and diluted EPS:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands, except per share data)
Net income (loss) attributable to Amkor common stockholders	$	(22,879	)	$	9,544
Weighted-average number of common shares outstanding — basic	239,414			239,214
Effect of dilutive securities:
Stock options and restricted share awards	—			602
Weighted-average number of common shares outstanding — diluted	239,414			239,816
Net income (loss) attributable to Amkor per common share:
Basic	$	(0.10	)	$	0.04
Diluted	(0.10		)	0.04

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 March 31,
	2019	2018
	(In thousands)
Stock options and restricted share awards	7,123	3,369

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

7.    Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss), net of tax, consist of the following:

	Defined Benefit Pension			Foreign Currency Translation			Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2018	$	2,659		$	21,153		$	23,812
Other comprehensive income (loss) before reclassifications	—			(2,224		)	(2,224		)
Amounts reclassified from accumulated other comprehensive income (loss)	(132		)	—			(132		)
Other comprehensive income (loss)	(132		)	(2,224		)	(2,356		)
Accumulated other comprehensive income (loss) at March 31, 2019	$	2,527		$	18,929		$	21,456

	Defined Benefit Pension			Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2017	$	6,303		$	16,216	$	22,519
Other comprehensive income (loss) before reclassifications	—			15,091		15,091
Amounts reclassified from accumulated other comprehensive income (loss)	(39		)	—		(39		)
Other comprehensive income (loss)	(39		)	15,091		15,052
Accumulated other comprehensive income (loss) at March 31, 2018	$	6,264		$	31,307	$	37,571

Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 13).

8.    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 this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the three months ended March 31, 2019 and 2018, we sold receivables totaling $155.7 million and $225.5 million, net of discounts and fees of $1.2 million and $1.8 million, respectively.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

9.    Property, Plant and Equipment

Property, plant and equipment consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Land	$	222,635		$	222,884
Land use rights (1)	—			26,845
Buildings and improvements	1,549,252			1,523,065
Machinery and equipment	5,217,555			5,196,930
Finance lease assets	24,016			25,874
Software and computer equipment	216,879			213,440
Furniture, fixtures and other equipment	17,186			17,204
Construction in progress	32,699			44,381
Total property, plant and equipment	7,280,222			7,270,623
Accumulated depreciation and amortization	(4,716,045		)	(4,620,175		)
Total property, plant and equipment, net	$	2,564,177		$	2,650,448

(1) Effective January 1, 2019, and in connection with the adoption of Topic 842, land use rights were reclassified to operating lease right of use asset within our Consolidated Balance Sheet.

The following table summarizes our depreciation expense:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Depreciation expense	$	135,493	$	142,004

10.    Leases

We lease certain machinery and equipment, office space, and manufacturing facilities. Leases with an initial term of 12 months or less are not recorded on the balance sheet and we recognize lease expense for these leases on a straight-line basis over the lease term. We account for lease components (e.g., fixed payments including rent, real estate taxes and insurance costs) combined with the non-lease components (e.g., common-area maintenance costs). We use our incremental borrowing rate based on the information available at the lease commencement date to determine the lease liability. Our leases have remaining lease terms ranging from less than one year to 87 years. For purposes of calculating our lease liabilities, our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise those options. Certain leases also include options to purchase the leased property.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

The components of lease expense were as follows:

	March 31, 2019
	(In thousands)
Operating lease cost	$	12,124
Finance lease cost
Amortization of leased assets	1,066
Interest on lease liabilities	214
Total Finance lease cost	1,280
Net lease cost	$	13,404

Rent expense was $12.8 million for three months ended March 31, 2018.

Other information related to leases was as follows:

	March 31, 2019
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	6,577
Operating cash flows for finance leases	211
Financing cash flows for finance leases	1,229
Weighted Average Remaining Lease Term (Years)
Operating leases	5.20
Finance leases	4.56
Weighted Average Discount Rate
Operating leases	4.4		%
Finance leases	4.9		%

Future minimum lease payments under non-cancellable leases were as follows:

	March 31, 2019						December 31, 2018
	Operating Leases			Finance Leases			Operating Leases		Finance Leases
	(In thousands)
2019 - Remaining	$	24,576		$	5,268		$	32,461	$	6,430
2020	27,599			4,753			24,630		4,555
2021	19,321			4,830			17,676		4,748
2022	11,210			955			10,942		936
2023	9,147			950			9,008		936
Thereafter	26,098			3,868			26,070		3,807
Total future minimum lease payments	117,951			20,624			$	120,787	$	21,412
Less: Imputed interest	(14,240		)	(2,490		)
Total	$	103,711		$	18,134

- 12-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

11.    Accrued Expenses

Accrued expenses consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Payroll and benefits	$	84,558	$	124,943
Short-term operating lease liability	29,835		—
Income taxes payable	27,114		38,567
Accrued interest	20,062		10,302
Deferred revenue and customer advances	16,573		16,736
Accrued severance plan obligations	14,697		13,179
Other accrued expenses	52,957		54,482
Total accrued expenses	$	245,796	$	258,209

- 13-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

12.    Debt

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

	March 31, 2019			December 31, 2018
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.375% Senior notes, due October 2022 (1)	$	524,971		$	524,971
6.625% Senior notes, due September 2027 (1)	525,000			—
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$30 million revolving credit facility, LIBOR plus the applicable bank rate, due October 2019 (2)	—			—
Term loan, fixed rate at 3.70%, due May 2020	120,000			120,000
Term loan, fund floating rate plus 1.60%, due June 2020 (3)	96,000			125,000
Term loan, LIBOR plus 2.56%, due December 2023	200,000			200,000
Term loan, applicable bank rate plus 1.98%, due December 2028 (3)	54,000			24,000
J-Devices Corporation:
Short-term term loans, variable rate (4)	27,368			8,232
Term loan, fixed rate at 0.86%, due June 2022	29,316			31,908
Term loan, fixed rate at 0.60%, due July 2022	6,314			6,838
Term loan, fixed rate at 1.30%, due July 2023	211,077			225,180
Amkor Assembly & Test (Shanghai) Co., Ltd. (5):
Term loan, LIBOR plus 1.80%, due December 2019 (6)	28,000			48,000
Term loan, LIBOR plus 1.60%, due March 2022 (6)	20,000			—
Other:
$250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) (7)	—			—
Revolving credit facility, TAIFX plus the applicable bank rate, due November 2020 (Taiwan) (8)	20,000			20,000
	1,862,046			1,334,129
Less: Unamortized premium, discount and deferred debt costs, net	(8,082		)	(1,818		)
Less: Short-term borrowings and current portion of long-term debt	(638,702		)	(114,579		)
Long-term debt	$	1,215,262		$	1,217,732

(1) In March 2019, we issued a redemption notice for the outstanding $525 million aggregate principal amount of our 6.375% Senior Notes due 2022 ("2022 Notes"). The redemption was completed in April 2019. In accordance with the terms of the indenture governing the 2022 Notes, the redemption price was 101.594% of the principal amount of the 2022 Notes plus accrued and unpaid interest. We expect to record a one-time charge in the second quarter of 2019 of approximately $8.0 million for early extinguishment of debt. The redemption of the 2022 Notes was funded with net proceeds from our issuance of $525 million of 6.625% Senior Notes due September 2027 ("2027 Notes") in March 2019, together with cash on hand. The 2027 Notes were issued at a discount of 99.5% or $2.6 million and are senior unsecured obligations. Interest is payable semiannually on March 15 and September 15 of each year, commencing September 15, 2019. We incurred $3.6 million of debt issuance costs associated with the 2027 Notes.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

(2) In October 2018, we entered into a revolving credit facility agreement with availability of $30.0 million. Principal will be payable at the maturity date of October 2019. Interest will be payable monthly in arrears, at LIBOR plus the applicable bank rate. As of March 31, 2019, $30.0 million was available to be drawn.

(3) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million for capital expenditures. Principal is payable at maturity in June 2020. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% (4.70% as of March 31, 2019). In February 2019, we repaid $29.0 million of the outstanding balance of this term loan using the proceeds from our term loan due December 2028.

In December 2018, we entered into a term loan agreement pursuant to which we may borrow up to $90.0 million for capital expenditures. In February 2019, we borrowed $30.0 million of this term loan and used the proceeds to repay part of the term loan due June 2020. Principal of this term loan is payable in semiannual installments beginning June 2022 and ending at maturity date of December 2028. Interest is payable quarterly in arrears, at the applicable bank rate plus 1.98% (4.62% as of March 31, 2019). As of March 31, 2019, $36.0 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 March 31, 2019 is at TIBOR plus 0.17% to 0.26% (weighted average of 0.20% as of March 31, 2019). As of March 31, 2019, $4.0 million was available to be drawn.

(5) In April 2019, we entered into a term loan agreement with availability of $20.0 million. Principal will be payable in semiannual installments of $0.5 million, with the remaining balance due at maturity, three years after the first borrowing. Interest will be payable quarterly at a floating rate of LIBOR plus 1.40%.

(6) In December 2016, we entered into a $50.0 million term loan agreement. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity date of December 2019. Interest is payable quarterly at a floating rate of LIBOR plus 1.80% (4.60% as of March 31, 2019). In March 2019, we repaid $20.0 million of the outstanding balance of this term loan using the proceeds from our term loan due March 2022.

In March 2019, we entered into a $30.0 million term loan agreement due March 2022. We borrowed $20.0 million under this term loan and repaid part of the term loan due December 2019. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity. Interest is payable quarterly at a floating rate of LIBOR plus 1.60% (4.21% as of March 31, 2019). As of March 31, 2019, $10.0 million was available to be drawn. In April 2019, we borrowed an additional $10.0 million of this new term loan and used the proceeds along with cash on hand to repay the remaining $28.0 million outstanding of the term loan due December 2019.

(7) 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 availability for our revolving credit facility is based on the amount of eligible accounts receivable. As of March 31, 2019, we had availability of $176.0 million with no outstanding standby letters of credit.

(8) In November 2015, we entered into a $39.0 million revolving credit facility. Principal is payable at maturity. Interest is payable monthly, at TAIFX plus the applicable bank rate (3.78% as of March 31, 2019). As of March 31, 2019, $19.0 million was available to be drawn.

Certain of our foreign debt is collateralized by the land, buildings, equipment and accounts receivable in the respective locations. The carrying value of the collateral exceeds the carrying amount of the 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. also guarantees 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. We have never paid a dividend to our stockholders and we do not have any present plans for doing so. We were in compliance with all debt covenants at March 31, 2019.

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AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

13.    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 March 31,
	2019			2018
	(In thousands)
Service cost	$	7,977		$	8,416
Interest cost	1,324			1,243
Expected return on plan assets	(1,618		)	(1,442		)
Recognized actuarial gain	(94		)	(35		)
Net periodic pension cost	$	7,589		$	8,182

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 March 31,
	2019		2018
	(In thousands)
Defined contribution expense	$	4,405	$	3,996

14.    Fair Value Measurements

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

The fair values of cash, accounts receivable, trade accounts payable, capital expenditures payable, and certain other current assets and accrued expenses approximate carrying values because of their short-term nature. The carrying value of certain other non-current assets and liabilities approximates fair value. Our assets and liabilities recorded at fair value on a recurring basis include cash equivalent money market funds and restricted cash money market funds. We also review goodwill for impairment annually during the fourth quarter of each year. 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

- 16-

AMKOR TECHNOLOGY, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(Unaudited)

credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets.

Recurring fair value measurements consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Cash equivalent money market funds (Level 1)	$	463,245	$	74,407
Restricted cash money market funds (Level 1)	2,589		2,589

We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis.

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

	March 31, 2019				December 31, 2018
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,067,500	$	1,043,595	$	526,131	$	524,978
Revolving credit facilities and term loans (Level 2)	815,432		810,369		803,867		807,333
Total debt	$	1,882,932	$	1,853,964	$	1,329,998	$	1,332,311

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.

15.    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.

- 17-

Item 2.         Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

Amkor is one of the world’s leading providers of outsourced semiconductor packaging and test services. Our financial goals are sales growth and improved profitability. To achieve these goals, we are focused on generating increased value from our investments in advanced technologies, improving utilization of existing assets, executing our balanced growth strategy and selectively growing our scale and scope through strategic investments.

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

of advanced packages into the automotive market are growing as well, largely due to new, data-intensive applications. The increasing pin count and performance requirements of automotive integrated circuits are driving the increased use of advanced packages. We believe that our technology leadership and this technology transition create significant growth opportunities for us.

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

From time to time, we identify attractive opportunities to grow our customer base and expand the markets we serve. For example, in May 2017, we acquired Nanium, which has strengthened our position in the market for wafer-level fan-out packaging. In December 2015, we completed the acquisition of J-Devices, the largest provider of outsourced semiconductor assembly and test services in Japan. J-Devices is primarily focused on the automotive, industrial and consumer end markets. We believe that selective growth through joint ventures, acquisitions and other strategic investments can help diversify our revenue streams, improve our profits, broaden our portfolio of services and maintain our technological leadership.

Our IDM customers include: Intel Corporation; Renesas Electronics Corporation; STMicroelectronics N.V.; Texas Instruments Incorporated and Toshiba Corporation. Our fabless customers include: Broadcom Limited, Qualcomm Incorporated and Toshiba Memory Corporation. Our contract foundry customers include: Samsung Electronics Company Limited and Taiwan Semiconductor Manufacturing Company Limited.

As a supplier in the semiconductor industry, our business is cyclical and impacted by broad economic factors. Historically, there has been a strong correlation between world-wide gross domestic product levels, consumer spending and semiconductor industry cycles. The semiconductor industry has experienced significant and sometimes prolonged cyclical upturns and downturns in the past. We believe that there is an inventory correction in the smartphone market and the general semiconductor market is going through a typical cyclical correction. We cannot predict the timing, strength or duration of any correction, economic slowdown or subsequent economic recovery.

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

We operate in a capital-intensive industry and have a significant level of debt. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures, which are generally made in advance of the related revenues and without firm customer commitments. We fund our operations,

- 18-

including capital expenditures and debt service requirements, with cash flows from operations, existing cash and cash equivalents, borrowings under available credit facilities and proceeds from any additional financing. Maintaining an appropriate level of liquidity is important to our business and depends on, among other things, the performance of our business, our capital expenditure levels and our ability to repay debt out of our operating cash flows or proceeds from debt or equity financings.

Financial Summary

Our net sales decreased $130.4 million or 12.7% to $895.0 million for the three months ended March 31, 2019 from $1,025.3 million for the three months ended March 31, 2018. This decrease was attributable to inventory corrections in the smartphone market and a cyclical correction in the general semiconductor market.

Gross margin for the three months ended March 31, 2019 decreased to 13.5% from 15.4% for the three months ended March 31, 2018. The decline in gross margin was primarily attributable to lower revenue, reduced utilization and changes in product mix.

Our capital expenditures totaled $203.2 million for the three months ended March 31, 2019, compared to $230.6 million for the three months ended March 31, 2018. The decrease in spending is primarily due to our initiative to reduce spending on incremental capacity during a period of reduced demand.

Net cash provided by operating activities was $52.1 million for the three months ended March 31, 2019, compared to $147.6 million for the three months ended March 31, 2018. This decrease was primarily due to lower net income and changes in our net working capital.

In March 2019, we issued $525 million aggregate principal amount of our 6.625% Senior Notes due 2027. The net proceeds from this issuance were used, together with cash on hand, to redeem the $525 million aggregate principal amount of our 6.375% Senior Notes due 2022 in April 2019.

Results of Operations

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

	For the Three Months Ended March 31,
	2019		2018
Net sales	100.0	%	100.0	%
Materials	38.0	%	36.9	%
Labor	17.4	%	17.5	%
Other manufacturing costs	31.1	%	30.2	%
Gross margin	13.5	%	15.4	%
Operating income	1.5	%	3.5	%
Net income attributable to Amkor	(2.6	)%	0.9	%

Net Sales

	For the Three Months Ended March 31,
	2019		2018		Change
	(In thousands, except percentages)
Net sales	$	894,964	$	1,025,319	$	(130,355	)	(12.7	)%

The decrease in net sales for the three months ended March 31, 2019, compared to the three months ended March 31, 2018, was attributable to inventory corrections in the smartphone market and a cyclical correction in the general semiconductor market.

- 19-

Gross Margin

	For the Three Months Ended March 31,
	2019			2018			Change
	(In thousands, except percentages)
Gross profit	$	120,761		$	157,771		$	(37,010	)
Gross margin	13.5		%	15.4		%	(1.9		)%

Our cost of sales consists principally of materials, labor, depreciation and manufacturing overhead. Since a substantial portion of the costs at our factories is fixed, there tends to be a strong relationship between our revenue levels and gross margin. Accordingly, relatively modest increases or decreases in revenue can have a significant effect on margin, depending upon product mix, utilization and seasonality.

Gross margin decreased for the three months ended March 31, 2019 compared to the three months ended March 31, 2018 primarily due to lower revenue, reduced utilization and changes in product mix.

Selling, General and Administrative

	For the Three Months Ended March 31,
	2019		2018		Change
	(In thousands, except percentages)
Selling, general and administrative	$	71,587	$	80,723	$	(9,136	)	(11.3	)%

Selling, general and administrative expenses for the three months ended March 31, 2019 decreased compared to the three months ended March 31, 2018 primarily due to decreased employee compensation costs.

Research and Development

	For the Three Months Ended March 31,
	2019		2018		Change
	(In thousands, except percentages)
Research and development	$	35,754	$	40,929	$	(5,175	)	(12.6	)%

Research and development activities are focused on developing new packaging and test services and improving the efficiency and capabilities of our existing production processes. The costs related to our technology and product development projects are included in research and development expense until the project moves into production. Once production begins, the costs related to production become part of the cost of sales, including ongoing depreciation for the equipment previously held for research and development activities. Research and development expenses for the three months ended March 31, 2019 decreased compared to the three months ended March 31, 2018. We experienced reductions in costs for projects that moved into production, partially offset by new development projects, primarily at our K5 factory and research and development facility in Korea.

Other Income and Expense

	For the Three Months Ended March 31,
	2019			2018			Change
	(In thousands, except percentages)
Interest expense	$	19,273		$	20,011		$	(738	)	(3.7	)%
Interest income	(2,064		)	(988		)	$	(1,076	)	>100%
Foreign currency (gain) loss, net	(2,013		)	4,713			(6,726		)	>(100)%
Other (income) expense, net	(488		)	(293		)	(195		)	66.6	%
Total other expense, net	$	14,708		$	23,443		$	(8,735	)	(37.3	)%

- 20-

Interest expense decreased for the three months ended March 31, 2019 compared to the three months ended March 31, 2018, primarily due to the redemption of $200 million of our 6.625% Senior Notes due 2021 in August 2018. This redemption was funded with proceeds from a term loan with a significantly lower interest rate. The interest expense decrease was partially offset by the interest incurred under our new $525 million aggregate principal amount of our 6.625% Senior Notes due September 2027 which were issued in March 2019.

The changes in foreign currency (gain) loss, net for the three months ended March 31, 2019 and the three months ended March 31, 2018 were due to foreign currency exchange rate movements and the associated impact on our net monetary exposure at our foreign subsidiaries.

Income Tax Expense

	For the Three Months Ended March 31,
	2019		2018		Change
	(In thousands)
Income tax expense	$	21,380	$	2,481	$	18,899

The majority of our income is earned and taxed in foreign jurisdictions in the Asia Pacific region with applicable tax rates similar to the U.S. federal and state combined tax rate of approximately 25%. Income tax expense, which includes foreign withholding taxes and minimum taxes, reflects the applicable tax rates in effect in the various countries where our income is earned and is subject to volatility depending on the relative mix of earnings in each location. Income tax expense for the three months ended March 31, 2019 also includes a $14.9 million non-cash discrete tax expense primarily for the recognition of a valuation allowance for certain deferred tax assets.

During the three months ended March 31, 2019 and 2018, our subsidiaries in Korea, the Philippines and Singapore operated under tax holidays. The tax holidays granted to our Malaysia operations and certain operations in the Philippines expired during 2018. As these tax holidays expire, income earned in these jurisdictions will be subject to higher statutory income tax rates, which may cause our effective tax rate to increase.

Liquidity and Capital Resources

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

Our primary source of cash and the source of funds for our operations are cash flows from operations, current cash and cash equivalents, borrowings under available credit facilities and proceeds from any additional debt or equity financings. In March 2019, we issued $525 million of 6.625% Senior Notes due September 2027 (the "2027 Notes"). Additionally, in March 2019, we issued a notice for the redemption of all $525 million aggregate principal amount of our 6.375% Senior Notes due October 2022 (the "2022 Notes"). The note redemption was completed in April 2019. We refer you to Note 12 to our Consolidated Financial Statements in Part 1, Item 1 of this Quarterly Report on Form 10-Q for additional information.

As of March 31, 2019, we had cash and cash equivalents of $1,055.4 million, which includes the cash that was used for the redemption of the $525 million 2022 Notes in April 2019. Included in our cash balance as of March 31, 2019, is $470.5 million held offshore by our foreign subsidiaries. We have the ability to access cash held offshore by our foreign subsidiaries primarily through the repayment of intercompany debt obligations. Due to the changes in the U.S. tax law under the Tax Act, distributions of cash to the U.S. as dividends generally will not be subject to U.S. federal income tax. If we were to

- 21-

distribute this offshore cash to the U.S. as dividends from our foreign subsidiaries, we may be subject to foreign withholding and state income taxes.

The borrowing base under our $250.0 million first lien senior secured revolving credit facility entered into by our subsidiary, Amkor Technology Singapore Holding Pte, Ltd. ("Singapore Revolver") is limited to the amount of eligible accounts receivable. As of March 31, 2019, we had availability of $176.0 million under this facility with no outstanding standby letters of credit. Our foreign subsidiaries had $225.0 million available to be drawn under secured revolving credit facilities, including the Singapore Revolver, and $50.0 million available to be borrowed under secured term loan credit facilities for working capital purposes and capital expenditures.

As of March 31, 2019, we had $1,854.0 million of debt, which includes $525 million aggregate principal amount of our 2022 Notes that was redeemed in April 2019. Our scheduled principal repayments on debt include $624.2 million due over the remainder of 2019, $294.3 million due in 2020, $58.3 million due in 2021, $78.8 million due in 2022, $242.9 million due in 2023, and $563.5 million due thereafter. We were in compliance with all debt covenants at March 31, 2019, and we expect to remain in compliance with these covenants for at least the next twelve months.

For certain accounts receivable, we use non-recourse factoring arrangements with third-party financial institutions to manage our working capital and cash flows. Under this program, we sell receivables to a financial institution for cash at a discount to the face amount. Available capacity under these programs is dependent on the level of our trade accounts receivable eligible to be sold, the financial institutions' willingness to purchase such receivables and the limits provided by the financial institutions. These factoring arrangements can be reduced or eliminated at any time due to market conditions and changes in the credit worthiness of customers. For the three months ended March 31, 2019 and 2018, we sold receivables totaling $155.7 million and $225.5 million, net of discounts and fees of $1.2 million and $1.8 million, respectively.

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

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

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

Our Board of Directors previously authorized the repurchase of up to $300 million of our common stock, exclusive of any fees, commissions or other expenses. At March 31, 2019, approximately $91.6 million was available to repurchase common stock pursuant to the stock repurchase program. The purchase of stock may be made in the open market or through privately negotiated transactions. The timing, manner, price and amount of any repurchases will be determined by us at our discretion and will depend upon a variety of factors including economic and market conditions, the cash needs and investment opportunities for the business, the current market price of our stock, applicable legal requirements and other factors. We have not purchased any stock under the plan since 2012.

Investments

We make significant capital expenditures in order to service the demand of our customers. We expect 2019 capital expenditures to be approximately $475 million. During the three months ended March 31, 2019, our capital expenditures totaled $203.2 million. Ultimately, the amount of our 2019 capital expenditures will depend on several factors including, among others, the timing and implementation of any capital projects under review, the performance of our business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity to service anticipated customer demand and the availability of cash flows from operations or financing.

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

Cash Flows

Net cash provided by (used in) operating, investing and financing activities for the three months ended March 31, 2019 and 2018, was as follows:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Operating activities	$	52,057		$	147,631
Investing activities	(202,067		)	(229,605		)
Financing activities	523,708			(23,925		)

Operating activities:   Our cash flows provided by operating activities for the three months ended March 31, 2019, decreased by $95.6 million compared to the three months ended March 31, 2018, primarily due to lower net income and changes in our net working capital.

Investing activities:   Our cash flows used in investing activities are principally for payments for property, plant and equipment, which decreased compared to the three months ended March 31, 2018, primarily due to our initiative to reduce spending on incremental capacity during a period of reduced demand.

Financing activities:   The net cash provided by financing activities for the three months ended March 31, 2019, was primarily due to our issuance of the 2027 Notes. The net cash used in financing activities for the three months ended March 31, 2018 was primarily due to repayments of debt in Japan.

We provide the following supplemental data to assist our investors and analysts in understanding our liquidity and capital resources. We define free cash flow as net cash provided by operating activities less payments for property, plant and equipment, plus proceeds from the sale of and insurance recovery for property, plant and equipment, if applicable. Free cash flow is not defined by U.S. GAAP. We believe free cash flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses free cash flow in evaluating our liquidity, our ability to service debt and our ability to fund capital expenditures. However, free cash flow has certain limitations, including that it does not represent the residual cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of free cash flow may not be comparable to similarly titled measures reported by other companies.

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Net cash provided by operating activities	$	52,057		$	147,631
Payments for property, plant and equipment	(203,216		)	(230,603		)
Proceeds from sale of and insurance recovery for property, plant and equipment	1,718			342
Free cash flow	$	(149,441	)	$	(82,630	)

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Contractual Obligations

The following table summarizes our contractual obligations at March 31, 2019, and the effect such obligations are expected to have on our liquidity and cash flows in future periods.

			Payments Due for Year Ending December 31,
	Total		2019 - Remaining		2020		2021		2022		2023		Thereafter
	(In thousands)
Total debt	$	1,862,046	$	624,237	$	294,330	$	58,330	$	78,769	$	242,880	$	563,500
Scheduled interest payment obligations (1)	400,624		55,846		55,037		49,936		48,534		47,248		144,023
Purchase obligations (2)	60,296		55,084		1,312		1,043		1,044		780		1,033
Operating lease obligations (3)	117,951		24,576		27,599		19,321		11,210		9,147		26,098
Finance lease obligations (3)	20,624		5,268		4,753		4,830		955		950		3,868
Severance obligations (4)	135,708		10,953		11,387		10,354		9,382		8,532		85,100
Total contractual obligations	$	2,597,249	$	775,964	$	394,418	$	143,814	$	149,894	$	309,537	$	823,622

(1) Represents interest payment obligations calculated using stated coupon rates for fixed rate debt and interest rates applicable at March 31, 2019, for variable rate debt.

(2) Represents off-balance sheet purchase obligations for capital expenditures and long-term supply contracts outstanding at March 31, 2019.

(3) Represents future minimum lease payments including interest payments.

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

In addition to the obligations identified in the table above, other non-current liabilities recorded in our Consolidated Balance Sheet at March 31, 2019, include:

• $60.5 million of net foreign pension plan obligations, for which the timing and actual amount of impact on our future cash flow is uncertain.

• $30.8 million net liability associated with unrecognized tax benefits. Due to the uncertainty regarding the amount and the timing of any future cash outflows associated with our unrecognized tax benefits, we are unable to reasonably estimate the amount and period of ultimate settlement, if any, with the various taxing authorities.

Off-Balance Sheet Arrangements

As of March 31, 2019, we had no off-balance sheet guarantees or other off-balance sheet arrangements as defined in Item 303(a)(4)(ii) of SEC Regulation S-K.

Contingencies, Indemnifications and Guarantees

We refer you to Note 15 to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q for a discussion of our contingencies related to litigation and other legal matters.

Critical Accounting Policies

Our critical accounting policies are disclosed in our Annual Report on Form 10-K for the year ended December 31, 2018. During the three months ended March 31, 2019, there were no significant changes in our critical accounting policies as reported in our 2018 Annual Report on Form 10-K.

New Accounting Pronouncements

For information regarding recent accounting pronouncements, we refer you to Note 2 to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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Item 3.        Quantitative and Qualitative Disclosures about Market Risk

Market Risk Sensitivity

We are exposed to market risks, primarily related to foreign currency and interest rate fluctuations. In the normal course of business, we employ established policies and procedures to manage the exposure to fluctuations in foreign currency values and changes in interest rates.

Foreign Currency Risk

The U.S. dollar is our reporting and functional currency for our subsidiaries, except for J-Devices, where the Japanese Yen is the functional currency. In order to reduce our exposure to foreign currency gains and losses, we generally use natural hedging techniques to reduce foreign currency rate risk. On a limited basis, we use forward contracts to mitigate foreign currency risk of certain monetary liabilities denominated in foreign currencies.

We have foreign currency exchange rate risk associated with the remeasurement of monetary assets and liabilities on our Consolidated Balance Sheets that are denominated in currencies other than the functional currency. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2019, to assess the potential impact of fluctuations in exchange rates for all foreign denominated assets and liabilities. Assuming that all foreign currencies appreciated 10% against the U.S. dollar, taking into account our foreign currency forward contracts, our income before taxes for the three months ended March 31, 2019 would have been approximately $15 million lower, due to the remeasurement of monetary assets and liabilities. We have a significant net monetary liability at our subsidiary in Korea, principally related to our Korean severance plan.

In addition, we have foreign currency exchange rate exposure on our results of operations. For the three months ended March 31, 2019, approximately 76% of our net sales were denominated in U.S. dollars. Our remaining net sales were principally denominated in Japanese Yen for local country sales. For the three months ended March 31, 2019, approximately 50% of our cost of sales and operating expenses were denominated in U.S. dollars and were largely for raw materials and costs associated with property, plant and equipment. The remaining portion of our cost of sales and operating expenses was principally denominated in the Asian currencies where our production facilities are located and largely consisted of labor. To the extent that the U.S. dollar weakens against these Asian-based currencies, similar foreign currency denominated income and expenses in the future will result in higher sales, higher cost of sales and operating expenses, with cost of sales and operating expenses having the greater impact on our financial results. Similarly, our sales, cost of sales and operating expenses will decrease if the U.S. dollar strengthens against these foreign currencies. We performed a sensitivity analysis of our foreign currency exposure as of March 31, 2019, to assess the potential impact of fluctuations in exchange rates for all foreign denominated sales and operating expenses. Assuming that all foreign currencies appreciated 10% against the U.S. dollar, our operating income for the three months ended March 31, 2019 would have been approximately $26 million lower.

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

Our Consolidated Financial Statements are impacted by changes in exchange rates at the entity where the local currency is the functional currency. The effect of foreign exchange rate translation for these entities was a loss of $2.2 million and a gain of $15.1 million for the three months ended March 31, 2019 and 2018, respectively, and was recognized as an adjustment to equity through other comprehensive income (loss).

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Interest Rate Risk

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

The table below presents the interest rates, maturities and fair value of our fixed and variable rate debt as of March 31, 2019:

	2019 - Remaining			2020			2021			2022			2023			Thereafter			Total			Fair Value
	($ in thousands)
Fixed rate debt	$	568,269		$	177,730		$	57,730		$	52,769		$	35,180		$	525,000		$	1,416,678		$	1,433,186
Average interest rate	6.0		%	2.9		%	1.2		%	1.2		%	1.3		%	6.6		%	5.3		%
Variable rate debt	$	55,968		$	116,600		$	600		$	26,000		$	207,700		$	38,500		$	445,368		$	449,746
Average interest rate	2.4		%	4.5		%	4.2		%	4.3		%	5.1		%	4.6		%	4.6		%
Total debt maturities	$	624,237		$	294,330		$	58,330		$	78,769		$	242,880		$	563,500		$	1,862,046		$	1,882,932

For information regarding the fair value of our long-term debt, see Note 14 to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Item 4.        Controls and Procedures

Evaluation of Disclosure Controls and Procedures

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

We carried out an evaluation, under the supervision and with the participation of management, including our Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2019, and concluded those disclosure controls and procedures were effective as of that date.

Changes in Internal Control Over Financial Reporting

As previously reported, we are implementing an enterprise resource planning system in a multi-year program in certain of our factories. There have been no changes in our internal control over financial reporting that occurred during the three months ended March 31, 2019 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1.        Legal Proceedings

Information about legal proceedings is set forth in Note 15 to our Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2018.

Item 1A.     Risk Factors

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

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

Our business is impacted by market conditions in the semiconductor industry, which is cyclical by nature and impacted by broad economic factors, such as world-wide gross domestic product and consumer spending. The semiconductor industry has experienced significant and sometimes sudden and prolonged downturns in the past. If the industry or markets we compete in experience slower, or even negative growth, our business and results of operations may be adversely affected.

Since our business is, and will continue to be, dependent on the requirements of semiconductor companies for outsourced packaging and test services, any downturn in the semiconductor industry or any other industry that uses a significant number of semiconductor devices, such as telecommunications, consumer electronics, or computing, could have a material adverse effect on our business and operating results. During downturns, we have experienced, among other things, reduced demand, excess capacity and reduced sales. For example, generally soft economic conditions and a lack of compelling new mobile products constrained overall demand during 2015. In addition, we believe that there is an inventory correction in the smartphone market and that the general semiconductor market is going through a typical cyclical correction. Macroeconomic uncertainties and a cautious business climate are also expected to constrain the revenue growth in our business. It is difficult to predict the timing, strength or duration of any economic slowdown or subsequent economic recovery, which, in turn, makes it more challenging for us to forecast our operating results, make business decisions and identify risks that may affect our business, sources and uses of cash, financial condition and results of operations. Additionally, if industry conditions deteriorate, we could suffer significant losses, as we have in the past, which could materially impact our business, liquidity, results of operations, financial condition and cash flows.

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

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

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

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

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• our ability to achieve our major growth objectives, including: transitioning second-wave customers to advanced packages; expanding our sales to customers in Greater China and, in particular, in the mid-level and entry-level tiers of the mobile device market; and increasing our share of the automotive market;

• changes in our capacity and capacity utilization rates;

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

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

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

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

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

• changes in labor costs to perform our services;

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

• the timing of expenditures in anticipation of future orders;

• changes in effective tax rates;

• the availability and cost of financing;

• intellectual property transactions and disputes;

• high leverage and restrictive covenants;

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

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

• political instability and government shutdowns, civil disturbances or environmental or natural events, such as earthquakes like the recent ones in Japan, that impact our operations, and international events, such as the United Kingdom's ongoing negotiations to leave the European Union;

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

• costs of acquisitions and divestitures and difficulties integrating acquisitions;

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

• fluctuations in interest rates and currency exchange rates;

• fluctuations in our manufacturing yields;

• our ability to penetrate new end markets or expand our business in existing end markets;

• dependence on key customers or concentration of customers in certain end markets, such as mobile communications and automotive and

• restructuring charges, asset write-offs and impairments.

It is often difficult to predict the impact of these factors upon our results for a particular period. These factors may have a material and adverse effect on our business, liquidity, results of operations, financial condition and cash flows or lead to

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significant variability of quarterly or annual operating results. In addition, these factors may adversely affect our credit ratings which could make it more difficult and expensive for us to raise capital and could adversely affect the price of our securities.

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

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

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

• laws, rules, regulations and policies imposed by U.S. or foreign governments, such as tariffs, customs, duties and other restrictive trade barriers, national security, data privacy and cybersecurity, antitrust and competition, tax, currency and banking, labor, environmental, health and safety, and in particular the recent increase in tariffs, customs, duties and other restrictive trade barriers considered or adopted by U.S. and foreign governments;

• laws, rules, regulations and policies within China and other countries that may favor domestic companies over non-domestic companies, including customer- or government-supported efforts to promote the development and growth of local competitors;

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

• fluctuations in currency exchange rates, particularly the dollar/yen exchange rate for J-Devices;

• political and social conditions, and the potential for civil unrest, terrorism or other hostilities;

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

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

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

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

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

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

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

The outsourced semiconductor packaging and test market is very competitive. We face substantial competition from established and emerging packaging and test service providers primarily located in Asia, including companies with significantly greater processing capacity, financial resources, local presence, research and development operations, marketing, technology and other capabilities. We also may face increased competition from domestic companies located in the People's Republic of China, or the PRC, where there are government-supported efforts to promote the development and growth of the local semiconductor industry. For example, STATS ChipPAC was acquired in 2015 by Jiangsu Electronics Technology Co., Ltd., a local PRC company. We may be at a disadvantage in attempting to compete with entities associated with such government-supported initiatives based on their lower cost of capital, access to government resources and incentives, preferential sourcing practices, stronger local relationships or otherwise. Our competitors may also have established relationships, or enter into new strategic relationships, with one or more of the large semiconductor companies that are our current or potential customers, or key suppliers to these customers. Consolidation among our competitors could also strengthen their competitive position. For example, Advanced Semiconductor Engineering, Inc. and Siliconware Precision Industries Co., Ltd. became sister companies under a new joint holding company, ASE Technology Holding Co. LTD., in April 2018.

We also face competition from the internal capabilities and capacity of many of our current and potential IDM and foundry customers. In addition, we compete with contract foundries, such as Taiwan Semiconductor Manufacturing Company Limited and Samsung Electronics Co., Ltd., which offer full turnkey services from silicon wafer fabrication through packaging and final test. These semiconductor foundries, which are substantially larger and have greater financial resources than we do, have expanded their operations to include packaging and test services, and may continue to expand these capabilities in the future.

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

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

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

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

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

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utilization, and if we fail to do so, our gross margins will be negatively impacted. If our gross margins decrease, our business, liquidity, results of operations, financial condition and cash flows could be materially adversely affected.

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

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

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

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

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

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

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

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

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

• their unwillingness to disclose proprietary technology;

• their possession of more advanced packaging and test technologies and

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

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

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

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

We have a significant amount of indebtedness, and the terms of the agreements governing our indebtedness allow us and our subsidiaries to incur more debt, subject to certain limitations. As of March 31, 2019, our total debt balance was $1,854.0 million, of which $638.7 million was classified as a current liability and $538.0 million was collateralized indebtedness at our subsidiaries. We may consider investments in joint ventures, increased capital expenditures, refinancings, or acquisitions which may increase our indebtedness. If new debt is added to our consolidated debt level, the related risks that we face could intensify.

Our substantial indebtedness could:

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

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

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

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

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

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

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

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

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

• increase our cost of borrowing.

We May Have Difficulty Funding Liquidity Needs.

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

We operate in a capital-intensive industry. We had capital expenditures of $203.2 million during the three months ended March 31, 2019. Servicing our current and future customers requires that we incur significant operating expenses and continue to make significant capital expenditures and other investments, which are generally made in advance of the related revenues and without firm customer commitments. Ultimately the actual amount of our capital expenditures for 2019 and thereafter may vary materially and will depend on several factors. These factors include, among others, the amount, timing and implementation of our capital projects, including those under review and those not yet planned, the performance of our

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business, economic and market conditions, the cash needs and investment opportunities for the business, the need for additional capacity and facilities and the availability of cash flows from operations or financing.

In addition, we have a significant level of debt, which requires significant scheduled principal and interest payments in the coming years. The sources funding our operations, including making capital expenditures and other investments and servicing principal and interest obligations with respect to our debt, are cash flows from our operations, existing cash and cash equivalents, borrowings under available debt facilities, or proceeds from any additional debt or equity financing.

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

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

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

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

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

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

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

Our subsidiary in Korea maintains an unfunded severance plan, under which we have an accrued liability of $135.7 million as of March 31, 2019. The plan covers certain employees that were employed prior to August 1, 2015. In the event of a significant layoff or other reduction in our labor force in Korea, our subsidiary in Korea would be required to make lump-sum severance payments under the plan, which could have a material adverse effect on our liquidity, financial condition and cash flows.

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

Effective internal controls are necessary to provide reliable financial reports and to assist in the effective prevention of

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fraud. We must annually evaluate our internal procedures to satisfy the requirements of Section 404 of the Sarbanes-Oxley Act of 2002, which requires management and our independent registered public accounting firm to assess the effectiveness of internal control over financial reporting.

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

We assess our internal controls and systems on an ongoing basis, and from time-to-time, we update and make modifications to our global enterprise resource planning system. We have implemented several significant enterprise resource planning modules and expect to implement additional enterprise resource planning modules in the future. In addition, we have implemented new shop floor management systems in certain of our factories. In December 2015, we acquired the operations of J-Devices, and we integrated those operations into our overall internal control over financial reporting. Although we continue to monitor and assess our internal controls for these systems and operations, there is a risk that deficiencies may occur that could constitute significant deficiencies or, in the aggregate, a material weakness.

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

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

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

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

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

We depend on our information technology systems for many aspects of our business. Our systems may be susceptible to damage, disruptions or shutdowns due to failures during the process of upgrading, replacing or maintaining software, databases or components thereof, power outages, hardware failures, interruption or failures of third-party provider systems, computer viruses, attacks by computer hackers, telecommunication failures, user errors, malfeasance or catastrophic events. In addition, security breaches could result in unauthorized disclosure of confidential information. Some of our key software has been developed by our own programmers, and this software may not be easily integrated with other software and systems. From time to time we make additions or changes to our information technology systems. For example, we have implemented new shop floor systems in certain of our factories, and we are integrating J-Devices' information technology systems with our existing systems and processes. In addition, in May 2017, we completed our acquisition of Nanium and continue to integrate its information technology systems into our existing systems and processes. We face risks in connection with current and future projects to install or integrate new information technology systems or upgrade our existing systems. These risks include:

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

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

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

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

We Face Risks Trying to Attract, Retain or Replace Qualified Employees to Support Our Operations.

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

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

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

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

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

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

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

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

In connection with these activities, we may:

• use a significant portion of our available cash;

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

• incur substantial debt;

• incur or assume known or unknown contingent liabilities and

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

For example, the businesses we have acquired had, at the time of acquisition, multiple systems for managing their own production, sales, inventory and other operations. Migrating these businesses to our systems typically is a slow, expensive process requiring us to divert significant resources from other parts of our operations. We may continue to face these challenges in the future. For example, in May 2017, we completed the purchase of Nanium, which we are now integrating with our existing operations. As a result of the risks discussed above, the anticipated benefits of these or other future acquisitions, consolidations and partnering arrangements may not be fully realized, if at all, and these activities could have a material adverse effect on our business, financial condition and results of operations.

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Dependence on Materials and Equipment Suppliers - Our Business May Suffer If the Cost, Quality or Supply of Materials or Equipment Changes Adversely Including Any Disruption that May Occur in the Supply of Certain Materials due to Regulations and Customer Requirements.

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

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

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

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

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

We have derived and expect to continue to derive a large portion of our revenues from a small group of customers during any particular period due in part to the concentration of market share in the semiconductor industry. Our ten largest customers together accounted for 62% of our net sales for the year ended December 31, 2018, and one customer accounted for more than 10% of our consolidated net sales during the period. In addition, we have significant customer concentration within

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our end markets. The loss of a significant customer, a business combination among our customers, a reduction in orders or decrease in price from a significant customer or disruption in any of our significant strategic partnerships or other commercial arrangements may result in a decline in our sales and profitability and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows.

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

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

In addition, from time to time we may acquire or build new facilities, such as K5, or migrate existing business among our facilities. In connection with these facility changes, our customers require us to re-qualify the new facilities even though we have already qualified to perform the services at our other facilities. We cannot assure that we will successfully re-qualify or that our customers will not qualify our competitors and move the business for such services.

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

We make significant investments in equipment and facilities in order to service the demand of our customers. For example, we expect that our 2019 capital expenditures will be approximately $475 million. The amount of our capital expenditures depends on several factors, including the performance of our business, our assessment of future industry and customer demand, our capacity utilization levels and availability, our liquidity position and the availability of financing. Our ongoing capital expenditure requirements may strain our cash and short-term asset balances, and, in periods when we are expanding our capital base, we expect that depreciation expense and factory operating expenses associated with our capital expenditures to increase production capacity will put downward pressure on our gross margin, at least over the near term. From time to time, we also make significant capital expenditures based on specific business opportunities with one or a few key customers, and the additional equipment purchased may not be readily usable to support other customers. If demand is insufficient to fill our capacity, or we are unable to efficiently redeploy such equipment, our capacity utilization and gross margin could be negatively impacted. Our capital expenditures or cost per square foot may increase as we transition to new or more advanced packaging and test technologies because, among other things, new equipment used for these technologies is generally more expensive and often our existing equipment cannot be redeployed in whole or part for these technologies.

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

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

• general market conditions for financing;

• volatility in fixed income, credit and equity markets and

• economic, political and other global conditions.

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

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

While we completed the initial phase of construction of K5 in December 2016, there can be no assurance regarding when the facility will be fully utilized, or that the actual scope, costs, timeline or benefits of the project will be consistent with our expectations.

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

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

Litigation Incident to Our Business Could Adversely Affect Us.

We have been a party to various legal proceedings, including those described from time to time in our reports filed with the SEC, and may be a party to legal proceedings in the future. These proceedings could require significant management time and resources and, if an unfavorable ruling or outcome were to occur in these legal proceedings, there could be a material adverse impact on our business, liquidity, results of operations, financial condition, cash flows and the trading price of our securities.

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

We earn a substantial portion of our income in foreign countries and our operations are subject to tax in multiple jurisdictions with complicated and varied tax regimes. Tax laws and income tax rates in these jurisdictions are subject to change due to economic and political conditions. In addition, organizations such as the Organisation for Economic Co-operation and Development may, from time to time, propose guidelines regarding transfer pricing and other international tax matters relating to multinational companies like Amkor. Changes in U.S. or foreign tax laws arising out of such proposals or otherwise could have a material adverse impact on our liquidity, results of operations, financial condition and cash flows.

Our tax liabilities are based, in part, on our corporate structure, interpretations of various U.S. and foreign tax laws, including withholding tax, compliance with tax holiday requirements, application of changes in tax law to our operations and other relevant laws of applicable taxing jurisdictions. From time to time, taxing authorities may conduct examinations of our income tax returns and other regulatory filings. We cannot assure you that the taxing authorities will agree with our interpretations, including whether we continue to qualify for tax holidays. If they do not agree, we may seek to enter into settlements with the taxing authorities. We may also appeal a taxing authority's determination to the appropriate governmental authorities, but we cannot be sure we will prevail. If we do not prevail or if we enter into settlements with taxing authorities, we may have to make significant payments or otherwise record charges (or reduce tax assets) that adversely affect our

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results of operations, financial condition and cash flows. Additionally, certain of our subsidiaries operate under tax holidays, which will expire in whole or in part at various dates in the future. As those tax holidays expire, we expect that our tax expense will increase as income from those jurisdictions becomes subject to higher statutory income tax rates, thereby reducing our liquidity and cash flow.

We monitor on an ongoing basis our ability to utilize our deferred tax assets and whether there is a need for a related valuation allowance. In evaluating our ability to recover our deferred tax assets, in the jurisdiction from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies and results of recent operations. For most of our foreign deferred tax assets, we believe that we will have sufficient taxable income to allow us to realize these deferred tax assets. In the event taxable income falls short of current expectations, we may need to establish a valuation allowance against such deferred tax assets that, if required, could materially affect our results of operations.

The Enactment of Recent Tax Reform Could Materially Impact Our Financial Position and Results of Operations.

On December 22, 2017, the Tax Act was signed into law. The Tax Act made significant changes to the U.S. tax code. Changes include a reduction of the U.S. federal corporate tax rate from 35% to 21%, a one-time transition tax on unremitted foreign earnings and profits applicable for our fiscal year ended December 31, 2017, limitations on tax deductions for interest expense for the period beginning January 1, 2018, and changes to other existing deductions and business-related exclusions in future periods. As a result, in the fourth quarter of 2017, we recognized a one-time net tax benefit of approximately $41.6 million, primarily due to the release of a valuation allowance against U.S. deferred tax assets that we expected to realize as a result of the change to the U.S. tax law limiting the deductibility of interest expense. We also incurred charges for the one-time transition tax on our unremitted foreign earnings and profits offset by the anticipated utilization of foreign tax credits. We were also required to re-measure our deferred tax assets based on the new U.S. federal corporate tax rate of 21%. In 2018, we updated our provisional estimate of the impact of the Tax Act, and recorded a $22.3 million income tax expense to complete the accounting for the impact of the Tax Act, reducing our estimated net tax benefit of $41.6 million from 2017. Our accounting for the impact of the Tax Act is now complete in accordance with SEC staff issued Staff Accounting Bulletin No. 118 ("SAB 118"). However, there is uncertainty in the application of many aspects of the Tax Act and additional guidance with respect to the Tax Act may affect our estimates and could have a material impact on our income tax expense.

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

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

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

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

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

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

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

• pay substantial damages;

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

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

We may need to enforce our patents or other intellectual property rights, including our rights under patent and intellectual property licenses with third parties, or defend ourselves against claimed infringement of the rights of others through litigation, which could result in substantial cost and diversion of our resources and may not be successful. Furthermore, if we fail to obtain necessary licenses, our business could suffer, and we could be exposed to claims for damages and injunctions from third parties, as well as claims from our customers for indemnification. In the past, we have been involved in legal proceedings involving the acquisition and license of intellectual property rights, the enforcement of our existing intellectual property rights or the enforcement of the intellectual property rights of others, including settled legal proceedings described in more detail in Note 15 to the Consolidated Financial Statements in Part II, Item 8 of our Annual Report on Form 10-K. Unfavorable outcomes in any legal proceedings involving intellectual property could result in significant liabilities or loss of commercial advantage and could have a material adverse effect on our business, liquidity, results of operations, financial condition and cash flows. The potential impact from the legal proceedings referred to in this Quarterly Report on Form 10-Q on our results of operations, financial condition and cash flows could change in the future.

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

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

• contaminants in the manufacturing environment;

• human error;

• equipment malfunction;

• changing processes to address environmental requirements;

• defective raw materials or

• defective plating services.

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

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

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

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

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

The semiconductor packaging process generates byproducts that are subject to extensive governmental regulations. For example, at our foreign facilities we produce liquid waste when semiconductor wafers are diced into chips with the aid of diamond saws, then cooled with running water. In addition, semiconductor packages have historically utilized metallic alloys containing lead (Pb) within the interconnect terminals typically referred to as leads, pins or balls. Environmental, health and safety laws and regulations in places we do business, impose various controls on the use, storage, handling, discharge and disposal of chemicals used in our production processes and on the factories we occupy and are increasingly imposing restrictions on the materials contained in semiconductor products. For example, the European Union's Restriction of Hazardous Substances in Electrical and Electronic Equipment directive and similar laws in other jurisdictions, including China, impose strict restrictions on the placement into the market of electrical and electronic equipment containing lead and certain other hazardous substances. We may become liable under these and other environmental, health and safety laws and regulations, including for the cost of compliance and cleanup of any disposal or release of hazardous materials arising out of our former or current operations, or otherwise as a result of the existence of hazardous materials on our properties or hazardous substances in the products we manufacture. We could also be held liable for damages, including fines, penalties and the cost of investigations and remedial actions, we could be subject to revocation of permits negatively affecting our ability to maintain or expand our operations, and we could suffer reputational harm.

There has also been an increase in public attention and industry and customer focus on the materials contained in semiconductor products, the environmental impact of semiconductor operations and the risk of chemical releases from such operations, climate change, sustainability and related environmental concerns. This increased focus on sustainability and the environmental impact of semiconductor operations and products has caused industry groups and customers to impose additional requirements on us and our suppliers, sometimes exceeding regulatory standards. These industry and customer

requirements include increased tracking and reporting of greenhouse gas emissions, reductions in waste and wastewater from operations, additional reporting on the materials and components used in the products we manufacture, and the use of renewable energy sources in our factory operations. To comply with these additional requirements, we may need to procure additional equipment or make factory or process changes and our manufacturing costs may increase.

Our Business and Financial Condition Could be Adversely Affected by Natural Disasters and Other Calamities, Political Instability, Hostilities, or Other Disruptions.

We have significant packaging and test and other operations in China, Japan, Korea, Malaysia, the Philippines, Portugal, Singapore, and Taiwan which are or could be subject to natural disasters, such as earthquakes, tsunamis, typhoons, floods, droughts, volcanoes and other severe weather and geological events, and other calamities, such as fire; the outbreak of infectious diseases (such as Ebola, SARS or flu); industrial strikes; breakdowns of equipment; difficulties or delays in obtaining materials, equipment, utilities and services; political events or instability; acts of war, armed conflict, terrorist incidents and other hostilities, including any such events that may arise out of increased tensions involving North Korea or in other regions where we have facilities; industrial accidents and other events, that could disrupt or even shutdown our operations. In addition, our suppliers and customers also have significant operations in such locations. In the event of such a disruption or shutdown, we may be unable to reallocate production to other facilities in a timely or cost-effective manner (if at all) and we may not have sufficient capacity to service customer demands in our other facilities. A natural disaster or other calamity, political instability, the occurrence of hostilities or other event that results in a prolonged disruption to our operations, or the operations of our customers or suppliers, could have a material adverse effect on our business, financial condition, results of operations and cash flows.

For example, in April 2016, our Kumamoto factory was damaged by earthquakes in Japan. As a result of these earthquakes, our sales were reduced due to the temporary disruption in operations. We also incurred earthquake related costs for damaged inventory, buildings and equipment.

- 41-

In addition, some of the processes that we utilize in our operations place us at risk of fire and other damage. For example, highly flammable gases are used in the preparation of wafers holding semiconductor devices for flip chip packaging.

Although we maintain insurance policies for various types of property, casualty and other risks, we do not carry insurance for all the above referred risks, and with regard to the insurance we do maintain, we cannot assure you that it would be sufficient to cover all of our potential losses. As a result, our business, financial condition, results of operations and cash flows could be adversely affected by natural disasters and other calamities.

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

As of March 31, 2019, Mr. James J. Kim, the Executive Chairman of our Board of Directors, Mr. John T. Kim, the Executive Vice Chairman of our Board of Directors, Ms. Susan Y. Kim, member of our Board of Directors, and members of the Kim family and affiliates owned approximately 141.7 million shares, or approximately 59%, of our outstanding common stock. The Kim family also has options to acquire approximately 0.4 million shares. If the options are exercised, the Kim family's total ownership would be an aggregate of approximately 142.1 million shares of our outstanding common stock or approximately 59% of our outstanding common stock.

In June 2013, the Kim family exchanged their convertible notes issued by Amkor for approximately 49.6 million shares of common stock (the "Convert Shares"). The Convert Shares are subject to a voting agreement. The agreement requires the Kim family to vote these shares in a “neutral manner” on all matters submitted to our stockholders for a vote, so that such Convert Shares are voted in the same proportion as all of the other outstanding securities (excluding the other shares owned by the Kim family) that are actually voted on a proposal submitted to Amkor's stockholders for approval. The Kim family is not required to vote in a “neutral manner” any Convert Shares that, when aggregated with all other voting shares held by the Kim family, represent 41.6% or less of the total then-outstanding voting shares of our common stock. The voting agreement for the Convert Shares terminates upon the earliest of (i) such time as the Kim family no longer beneficially owns any of the Convert Shares, (ii) consummation of a change of control (as defined in the voting agreement) or (iii) the mutual agreement of the Kim family and Amkor.

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

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Item 2.         Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Repurchase of Equity Securities

The following table provides information regarding repurchases of our common stock during the three months ended March 31, 2019.

Period	Total Number of Shares Purchased (a)	Average Price Paid Per Share ($)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (b)	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($) (b)
January 1 - January 31	—	$	—	—	$	91,586,032
February 1 - February 28	5,425	8.84		—	91,586,032
March 1 - March 31	—	—		—	91,586,032
Total	5,425	$	8.84	—

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

(b) Our Board of Directors previously authorized the repurchase of up to $300.0 million of our common stock, $150.0 million in August 2011 and $150.0 million in February 2012, exclusive of any fees, commissions or other expenses. For the three months ended March 31, 2019, we made no common stock purchases, and at March 31, 2019, approximately $91.6 million was available pursuant to the stock repurchase program.

Item 3.        Defaults Upon Senior Securities

None.

Item 4.        Mine Safety Disclosures

Not applicable.

Item 5.        Other Information

None.

- 43-

Item 6.        Exhibits

		Incorporated by Reference				Filed Herewith
Exhibit Number	Exhibit Description	Form	Period Ending	Exhibit	Filing Date
4.1	Indenture, dated March 15, 2019, by and between Amkor Technology, Inc. and U.S. Bank National Association, as trustee, regarding the 6.625% Senior Notes due 2027.	8-K		4.1	3/15/19
4.2	Form of Note for Amkor Technology, Inc.’s 6.625% Senior Notes due 2027 (incorporated by reference to Exhibit 4.1 hereof).	8-K		4.2	3/15/19
31.1	Certification of Stephen D. Kelley, President and Chief Executive Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.					X
31.2	Certification of Megan Faust, Corporate Vice President and Chief Financial Officer of Amkor Technology, Inc., pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.					X
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
101.INS	XBRL Instance Document					X
101.SCH	XBRL Taxonomy Extension Schema Document					X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document					X
101.LAB	XBRL Taxonomy Extension Label Linkbase Document					X
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document					X
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document					X

- 44-

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

AMKOR TECHNOLOGY, INC.

By:	/s/  Megan Faust
	Megan Faust
	Corporate Vice President and
	Chief Financial Officer

Date: May 2, 2019

- 45-

EX-31.1

Exhibit 31.1

SECTION 302 CERTIFICATION

I, Stephen D. Kelley, certify that:

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

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

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

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

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

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

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

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

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

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

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

/s/ Stephen D. Kelley

Stephen D. Kelley

President and Chief Executive Officer

May 2, 2019

EX-31.2

Exhibit 31.2

SECTION 302 CERTIFICATION

I, Megan Faust, certify that:

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

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

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

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

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

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

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

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

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

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

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

/s/ Megan Faust

Megan Faust

Corporate Vice President and

Chief Financial Officer

May 2, 2019

EX-32

Exhibit 32

CERTIFICATIONS OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Amkor Technology, Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2019, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stephen D. Kelley, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Stephen D. Kelley

Stephen D. Kelley

President and Chief Executive Officer

May 2, 2019

In connection with the Quarterly Report of Amkor Technology, Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2019, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Megan Faust, Corporate Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Megan Faust

Megan Faust

Corporate Vice President and

Chief Financial Officer

May 2, 2019

XML

Document and Entity Information Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 26, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	AMKOR TECHNOLOGY, INC.
Entity Central Index Key	0001047127
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		239,627,109

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (22,668)	$ 10,195
Other comprehensive income (loss), net of tax:
Adjustments to unrealized components of defined benefit pension plans	(132)	(39)
Foreign currency translation	(2,224)	15,091
Total other comprehensive income (loss)	(2,356)	15,052
Comprehensive income (loss)	(25,024)	25,247
Comprehensive income attributable to non-controlling interests	(211)	(651)
Comprehensive income (loss) attributable to Amkor	$ (25,235)	$ 24,596

XML

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 894,964	$ 1,025,319
Cost of sales	774,203	867,548
Gross profit	120,761	157,771
Selling, general and administrative	71,587	80,723
Research and development	35,754	40,929
Total operating expenses	107,341	121,652
Operating income	13,420	36,119
Interest expense	19,273	20,011
Other (income) expense, net	(4,565)	3,432
Total other expense, net	14,708	23,443
Income (loss) before taxes	(1,288)	12,676
Income tax expense	21,380	2,481
Net income (loss)	(22,668)	10,195
Net income attributable to non-controlling interests	(211)	(651)
Net income (loss) attributable to Amkor	$ (22,879)	$ 9,544
Net income (loss) attributable to Amkor per common share:
Basic (in dollars per share)	$ (0.10)	$ 0.04
Diluted (in dollars per share)	$ (0.10)	$ 0.04
Shares used in computing per common share amounts:
Basic (in shares)	239,414	239,214
Diluted (in shares)	239,414	239,816

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,055,402	$ 681,569
Restricted cash	2,589	2,589
Accounts receivable, net of allowances	684,914	724,456
Inventories	227,502	230,589
Other current assets	32,522	32,005
Total current assets	2,002,929	1,671,208
Property, plant and equipment, net	2,564,177	2,650,448
Operating lease right of use asset	122,982	0
Goodwill	25,449	25,720
Restricted cash	2,929	3,893
Other assets	128,720	144,178
Total assets	4,847,186	4,495,447
Current liabilities:
Short-term borrowings and current portion of long-term debt	638,702	114,579
Trade accounts payable	459,383	530,398
Capital expenditures payable	123,737	255,237
Accrued expenses	245,796	258,209
Total current liabilities	1,467,618	1,158,423
Long-term debt	1,215,262	1,217,732
Pension and severance obligations	181,826	184,321
Long-term operating lease liability	73,876	0
Other non-current liabilities	76,022	79,071
Total liabilities	3,014,604	2,639,547
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; 285,430 and 285,352 shares issued; and 239,458 and 239,385 shares outstanding in 2019 and 2018, respectively	285	285
Additional paid-in capital	1,911,179	1,909,425
Retained earnings	90,310	113,189
Accumulated other comprehensive income (loss)	21,456	23,812
Treasury stock, at cost, 45,972 and 45,967 shares, in 2019 and 2018, respectively	(216,219)	(216,171)
Total Amkor stockholders’ equity	1,807,011	1,830,540
Non-controlling interests in subsidiaries	25,571	25,360
Total equity	1,832,582	1,855,900
Total liabilities and equity	$ 4,847,186	$ 4,495,447

XML

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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	285,430,000	285,352,000
Common stock, shares outstanding	239,458,000	239,385,000
Treasury stock, shares	45,972,000	45,967,000

XML

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 Deficit)	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest in Subsidiaries
Balance at beginning of period, shares at Dec. 31, 2017			285,129
Balance at beginning of period, shares at Dec. 31, 2017							(45,945)
Balance at beginning of period at Dec. 31, 2017	$ 1,719,709	$ 1,696,276	$ 285	$ 1,903,357	$ (13,903)	$ 22,519	$ (215,982)	$ 23,433
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,195
Net income attributable to Amkor	9,544	9,544			9,544
Net income attributable to noncontrolling interests	651							651
Other comprehensive income (loss)	15,052	15,052				15,052
Treasury stock acquired through surrender of shares for tax withholding, shares							(5)
Treasury stock acquired through surrender of shares for tax withholding	(56)	(56)					$ (56)
Issuance of stock through share-based compensation plans, shares			155
Issuance of stock through share-based compensation plans	1,022	1,022		1,022
Share-based compensation	1,287	1,287		1,287
Subsidiary dividends to noncontrolling interests	(135)							(135)
Balance at end of period, shares at Mar. 31, 2018			285,284
Balance at end of period, shares at Mar. 31, 2018							(45,950)
Balance at end of period at Mar. 31, 2018	$ 1,747,074	1,723,125	$ 285	1,905,666	(4,359)	37,571	$ (216,038)	23,949
Balance at beginning of period, shares at Dec. 31, 2018	285,352		285,352
Balance at beginning of period, shares at Dec. 31, 2018	(45,967)						(45,967)
Balance at beginning of period at Dec. 31, 2018	$ 1,855,900	1,830,540	$ 285	1,909,425	113,189	23,812	$ (216,171)	25,360
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(22,668)
Net income attributable to Amkor	(22,879)	(22,879)			(22,879)
Net income attributable to noncontrolling interests	211							211
Other comprehensive income (loss)	(2,356)	(2,356)				(2,356)
Treasury stock acquired through surrender of shares for tax withholding, shares							(5)
Treasury stock acquired through surrender of shares for tax withholding	(48)	(48)					$ (48)
Issuance of stock through share-based compensation plans, shares			78
Issuance of stock through share-based compensation plans	286	286		286
Share-based compensation	$ 1,468	1,468		1,468
Balance at end of period, shares at Mar. 31, 2019	285,430		285,430
Balance at end of period, shares at Mar. 31, 2019	(45,972)						(45,972)
Balance at end of period at Mar. 31, 2019	$ 1,832,582	$ 1,807,011	$ 285	$ 1,911,179	$ 90,310	$ 21,456	$ (216,219)	$ 25,571

XML

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (22,668)	$ 10,195
Depreciation and amortization	135,835	142,509
Other operating activities and non-cash items	15,928	(4,734)
Changes in assets and liabilities	(77,038)	(339)
Net cash provided by operating activities	52,057	147,631
Cash flows from investing activities:
Payments for property, plant and equipment	(203,216)	(230,603)
Proceeds from sale of property, plant and equipment	180	342
Proceeds from insurance recovery for property, plant and equipment	1,538	0
Other investing activities	(569)	656
Net cash used in investing activities	(202,067)	(229,605)
Cash flows from financing activities:
Proceeds from short-term debt	29,781	0
Payments of short-term debt	(10,588)	(17,352)
Proceeds from issuance of long-term debt	572,375	0
Payments of long-term debt	(63,636)	(6,220)
Payments of finance lease obligations	(1,376)	(808)
Other financing activities	(2,848)	455
Net cash provided by (used in) financing activities	523,708	(23,925)
Effect of exchange rate fluctuations on cash, cash equivalents and restricted cash	(829)	3,892
Net increase (decrease) in cash, cash equivalents and restricted cash	372,869	(102,007)
Cash, cash equivalents and restricted cash, beginning of period	688,051	602,851
Cash, cash equivalents and restricted cash, end of period	1,060,920	500,844
Non-cash investing and financing activities:
Property, plant and equipment included in capital expenditures payable	124,547	224,037
Right of use assets acquired through finance lease liabilities	92	923
Right of use assets acquired through operating lease liabilities	$ 7,328	$ 0

XML

Interim Financial Statements

3 Months Ended

Mar. 31, 2019

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 March 31, 2019, and for the three months ended March 31, 2019 and 2018, are unaudited, pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). The December 31, 2018, Consolidated Balance Sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S.”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. In our opinion, these financial statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods. These financial statements should be read in conjunction with the financial statements included in our Annual Report for the year ended December 31, 2018, filed on Form 10-K with the SEC on February 22, 2019. The results of operations for the three months ended March 31, 2019, are not necessarily indicative of the results to be expected for the full year. Unless the context otherwise requires, all references to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and our subsidiaries.

Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments.

Goodwill. The balance of goodwill in our Consolidated Balance Sheets reflects adjustments for foreign currency translation.

Unbilled Receivables. Total unbilled receivables as of March 31, 2019 and December 31, 2018 were $82.6 million and $89.3 million, respectively.

XML

New Accounting Standards

3 Months Ended

Mar. 31, 2019

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards

New Accounting Standards

Recently Adopted Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which was subsequently amended and clarified. Topic 842 requires a dual approach for lease accounting under which a lessee would account for leases as finance leases or operating leases. The standard also requires the lessee to recognize a right-of-use asset and a corresponding lease liability for both finance leases and operating leases. For finance leases, the lessee recognizes interest expense and amortization of the right-of-use asset, and for operating leases, the lessee recognizes a straight-line lease expense. The standard permits the use of two alternative transition approaches, either with application in all comparative periods presented, or with application beginning with the effective date without restating comparative period financial statements.

Effective January 1, 2019, we adopted the requirements of Topic 842 using the modified transition approach without restating the comparative period financial statements. The new standard resulted in increases in our operating lease right of use asset, accrued expenses and long-term operating lease liability account balances to record our operating leases on our Consolidated Balance Sheet. The new standard also resulted in additional disclosures for our operating and finance leases (Note 10).

In accordance with Topic 842, we applied practical expedients permitted under the transition guidance, which allowed us to not:

• Reassess whether any existing contracts are or contain a lease,

• Reassess the lease classification for any existing contracts,

• Reassess initial direct costs for any existing leases, and

• Separate non-lease components from lease components and instead to account for them as a single lease component for all asset classes.

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Net Sales by Product Group and End Market

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Net Sales by Product Group and End Market

Net Sales by Product Group and End Market

Net sales by product group consist of the following:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Advanced products (1)	$	422,446	$	475,752
Mainstream products (2)	472,518		549,567
Total net sales	$	894,964	$	1,025,319

(1) Advanced products include flip chip and wafer-level processing and related test services

(2) Mainstream products include wirebond packaging and related test services

Net sales by end market consist of the following:

	For the Three Months Ended March 31,
	2019		2018
Communications (smartphones, tablets, handheld devices)	38	%	42	%
Automotive, industrial and other (driver assist, infotainment, safety, performance)	28	%	26	%
Computing (datacenter, infrastructure, PC/laptop, storage)	20	%	19	%
Consumer (set-top boxes, televisions, connected home, personal electronics, visual imaging)	14	%	13	%
Total net sales	100	%	100	%

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Other Income and Expense

3 Months Ended

Mar. 31, 2019

Other Income and Expenses [Abstract]

Other Income and Expense

Other Income and Expense

Other income and expense consists of the following:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Interest income	$	(2,064	)	$	(988	)
Foreign currency (gain) loss, net	(2,013		)	4,713
Other	(488		)	(293		)
Other (income) expense, net	$	(4,565	)	$	3,432

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Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Income tax expense of $21.4 million for the three months ended March 31, 2019 reflects income taxes, foreign withholding taxes and minimum taxes. Income tax expense for the three months ended March 31, 2019 also includes a $14.9 million non-cash discrete tax expense primarily for the recognition of a valuation allowance for certain deferred tax assets.

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. Based on current projections of future taxable income in foreign jurisdictions, foreign deferred tax assets of $14.9 million are not expected to be realized, including certain tax credit carryforwards that are expected to expire unused.

We maintain a valuation allowance on a portion of our U.S. net deferred tax assets for deferred interest expense carryforwards, net operating loss carryforwards and foreign tax credit carryforwards that are expected to expire unused. 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 were $25.3 million at December 31, 2018 and $25.2 million as of March 31, 2019. 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. Tax return examinations involve uncertainties, and there can be no assurance that the outcome of examinations will be favorable.

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Earnings Per Share

3 Months Ended

Mar. 31, 2019

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 and unvested restricted shares.

The following table summarizes the computation of basic and diluted EPS:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands, except per share data)
Net income (loss) attributable to Amkor common stockholders	$	(22,879	)	$	9,544
Weighted-average number of common shares outstanding — basic	239,414			239,214
Effect of dilutive securities:
Stock options and restricted share awards	—			602
Weighted-average number of common shares outstanding — diluted	239,414			239,816
Net income (loss) attributable to Amkor per common share:
Basic	$	(0.10	)	$	0.04
Diluted	(0.10		)	0.04

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 March 31,
	2019	2018
	(In thousands)
Stock options and restricted share awards	7,123	3,369

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2019

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:

	Defined Benefit Pension			Foreign Currency Translation			Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2018	$	2,659		$	21,153		$	23,812
Other comprehensive income (loss) before reclassifications	—			(2,224		)	(2,224		)
Amounts reclassified from accumulated other comprehensive income (loss)	(132		)	—			(132		)
Other comprehensive income (loss)	(132		)	(2,224		)	(2,356		)
Accumulated other comprehensive income (loss) at March 31, 2019	$	2,527		$	18,929		$	21,456

	Defined Benefit Pension			Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2017	$	6,303		$	16,216	$	22,519
Other comprehensive income (loss) before reclassifications	—			15,091		15,091
Amounts reclassified from accumulated other comprehensive income (loss)	(39		)	—		(39		)
Other comprehensive income (loss)	(39		)	15,091		15,052
Accumulated other comprehensive income (loss) at March 31, 2018	$	6,264		$	31,307	$	37,571

Amounts reclassified out of accumulated other comprehensive income (loss) are included as a component of net periodic pension cost (Note 13).

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Factoring of Accounts Receivable

3 Months Ended

Mar. 31, 2019

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 this program, we sell receivables to a financial institution for cash at a discount to the face amount. As part of the factoring arrangements, we perform certain collection and administrative functions for the receivables sold. For the three months ended March 31, 2019 and 2018, we sold receivables totaling $155.7 million and $225.5 million, net of discounts and fees of $1.2 million and $1.8 million, respectively.

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Property, Plant and Equipment

3 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Land	$	222,635		$	222,884
Land use rights (1)	—			26,845
Buildings and improvements	1,549,252			1,523,065
Machinery and equipment	5,217,555			5,196,930
Finance lease assets	24,016			25,874
Software and computer equipment	216,879			213,440
Furniture, fixtures and other equipment	17,186			17,204
Construction in progress	32,699			44,381
Total property, plant and equipment	7,280,222			7,270,623
Accumulated depreciation and amortization	(4,716,045		)	(4,620,175		)
Total property, plant and equipment, net	$	2,564,177		$	2,650,448

(1) Effective January 1, 2019, and in connection with the adoption of Topic 842, land use rights were reclassified to operating lease right of use asset within our Consolidated Balance Sheet.

The following table summarizes our depreciation expense:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Depreciation expense	$	135,493	$	142,004

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Accrued Expenses

3 Months Ended

Mar. 31, 2019

Payables and Accruals [Abstract]

Accrued Expenses

Accrued Expenses

Accrued expenses consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Payroll and benefits	$	84,558	$	124,943
Short-term operating lease liability	29,835		—
Income taxes payable	27,114		38,567
Accrued interest	20,062		10,302
Deferred revenue and customer advances	16,573		16,736
Accrued severance plan obligations	14,697		13,179
Other accrued expenses	52,957		54,482
Total accrued expenses	$	245,796	$	258,209

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Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Debt

Debt

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

	March 31, 2019			December 31, 2018
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.375% Senior notes, due October 2022 (1)	$	524,971		$	524,971
6.625% Senior notes, due September 2027 (1)	525,000			—
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$30 million revolving credit facility, LIBOR plus the applicable bank rate, due October 2019 (2)	—			—
Term loan, fixed rate at 3.70%, due May 2020	120,000			120,000
Term loan, fund floating rate plus 1.60%, due June 2020 (3)	96,000			125,000
Term loan, LIBOR plus 2.56%, due December 2023	200,000			200,000
Term loan, applicable bank rate plus 1.98%, due December 2028 (3)	54,000			24,000
J-Devices Corporation:
Short-term term loans, variable rate (4)	27,368			8,232
Term loan, fixed rate at 0.86%, due June 2022	29,316			31,908
Term loan, fixed rate at 0.60%, due July 2022	6,314			6,838
Term loan, fixed rate at 1.30%, due July 2023	211,077			225,180
Amkor Assembly & Test (Shanghai) Co., Ltd. (5):
Term loan, LIBOR plus 1.80%, due December 2019 (6)	28,000			48,000
Term loan, LIBOR plus 1.60%, due March 2022 (6)	20,000			—
Other:
$250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) (7)	—			—
Revolving credit facility, TAIFX plus the applicable bank rate, due November 2020 (Taiwan) (8)	20,000			20,000
	1,862,046			1,334,129
Less: Unamortized premium, discount and deferred debt costs, net	(8,082		)	(1,818		)
Less: Short-term borrowings and current portion of long-term debt	(638,702		)	(114,579		)
Long-term debt	$	1,215,262		$	1,217,732

(1) In March 2019, we issued a redemption notice for the outstanding $525 million aggregate principal amount of our 6.375% Senior Notes due 2022 ("2022 Notes"). The redemption was completed in April 2019. In accordance with the terms of the indenture governing the 2022 Notes, the redemption price was 101.594% of the principal amount of the 2022 Notes plus accrued and unpaid interest. We expect to record a one-time charge in the second quarter of 2019 of approximately $8.0 million for early extinguishment of debt. The redemption of the 2022 Notes was funded with net proceeds from our issuance of $525 million of 6.625% Senior Notes due September 2027 ("2027 Notes") in March 2019, together with cash on hand. The 2027 Notes were issued at a discount of 99.5% or $2.6 million and are senior unsecured obligations. Interest is payable semiannually on March 15 and September 15 of each year, commencing September 15, 2019. We incurred $3.6 million of debt issuance costs associated with the 2027 Notes.

(2) In October 2018, we entered into a revolving credit facility agreement with availability of $30.0 million. Principal will be payable at the maturity date of October 2019. Interest will be payable monthly in arrears, at LIBOR plus the applicable bank rate. As of March 31, 2019, $30.0 million was available to be drawn.

(3) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million for capital expenditures. Principal is payable at maturity in June 2020. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% (4.70% as of March 31, 2019). In February 2019, we repaid $29.0 million of the outstanding balance of this term loan using the proceeds from our term loan due December 2028.

In December 2018, we entered into a term loan agreement pursuant to which we may borrow up to $90.0 million for capital expenditures. In February 2019, we borrowed $30.0 million of this term loan and used the proceeds to repay part of the term loan due June 2020. Principal of this term loan is payable in semiannual installments beginning June 2022 and ending at maturity date of December 2028. Interest is payable quarterly in arrears, at the applicable bank rate plus 1.98% (4.62% as of March 31, 2019). As of March 31, 2019, $36.0 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 March 31, 2019 is at TIBOR plus 0.17% to 0.26% (weighted average of 0.20% as of March 31, 2019). As of March 31, 2019, $4.0 million was available to be drawn.

(5) In April 2019, we entered into a term loan agreement with availability of $20.0 million. Principal will be payable in semiannual installments of $0.5 million, with the remaining balance due at maturity, three years after the first borrowing. Interest will be payable quarterly at a floating rate of LIBOR plus 1.40%.

(6) In December 2016, we entered into a $50.0 million term loan agreement. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity date of December 2019. Interest is payable quarterly at a floating rate of LIBOR plus 1.80% (4.60% as of March 31, 2019). In March 2019, we repaid $20.0 million of the outstanding balance of this term loan using the proceeds from our term loan due March 2022.

In March 2019, we entered into a $30.0 million term loan agreement due March 2022. We borrowed $20.0 million under this term loan and repaid part of the term loan due December 2019. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity. Interest is payable quarterly at a floating rate of LIBOR plus 1.60% (4.21% as of March 31, 2019). As of March 31, 2019, $10.0 million was available to be drawn. In April 2019, we borrowed an additional $10.0 million of this new term loan and used the proceeds along with cash on hand to repay the remaining $28.0 million outstanding of the term loan due December 2019.

(7) 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 availability for our revolving credit facility is based on the amount of eligible accounts receivable. As of March 31, 2019, we had availability of $176.0 million with no outstanding standby letters of credit.

(8) In November 2015, we entered into a $39.0 million revolving credit facility. Principal is payable at maturity. Interest is payable monthly, at TAIFX plus the applicable bank rate (3.78% as of March 31, 2019). As of March 31, 2019, $19.0 million was available to be drawn.

Certain of our foreign debt is collateralized by the land, buildings, equipment and accounts receivable in the respective locations. The carrying value of the collateral exceeds the carrying amount of the 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. also guarantees 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. We have never paid a dividend to our stockholders and we do not have any present plans for doing so. We were in compliance with all debt covenants at March 31, 2019.

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Pension Plans

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019			2018
	(In thousands)
Service cost	$	7,977		$	8,416
Interest cost	1,324			1,243
Expected return on plan assets	(1,618		)	(1,442		)
Recognized actuarial gain	(94		)	(35		)
Net periodic pension cost	$	7,589		$	8,182

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 March 31,
	2019		2018
	(In thousands)
Defined contribution expense	$	4,405	$	3,996

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Fair Value Measurements

3 Months Ended

Mar. 31, 2019

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.

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 cash equivalent money market funds and restricted cash money market funds. We also review goodwill for impairment annually during the fourth quarter of each year. Cash equivalent money market funds and restricted cash money market funds are invested in U.S. money market funds and various U.S. and foreign bank operating and time deposit accounts, which are due on demand or carry a maturity date of less than three months when purchased. No restrictions have been imposed on us regarding withdrawal of balances with respect to our cash equivalents as a result of liquidity or other credit market issues affecting the money market funds we invest in or the counterparty financial institutions holding our deposits. Money market funds are valued using quoted market prices in active markets for identical assets.

Recurring fair value measurements consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Cash equivalent money market funds (Level 1)	$	463,245	$	74,407
Restricted cash money market funds (Level 1)	2,589		2,589

We also measure certain assets and liabilities, including property, plant and equipment and goodwill, at fair value on a nonrecurring basis.

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

	March 31, 2019				December 31, 2018
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,067,500	$	1,043,595	$	526,131	$	524,978
Revolving credit facilities and term loans (Level 2)	815,432		810,369		803,867		807,333
Total debt	$	1,882,932	$	1,853,964	$	1,329,998	$	1,332,311

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.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

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.

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Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

Leases

We lease certain machinery and equipment, office space, and manufacturing facilities. Leases with an initial term of 12 months or less are not recorded on the balance sheet and we recognize lease expense for these leases on a straight-line basis over the lease term. We account for lease components (e.g., fixed payments including rent, real estate taxes and insurance costs) combined with the non-lease components (e.g., common-area maintenance costs). We use our incremental borrowing rate based on the information available at the lease commencement date to determine the lease liability. Our leases have remaining lease terms ranging from less than one year to 87 years. For purposes of calculating our lease liabilities, our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise those options. Certain leases also include options to purchase the leased property.

The components of lease expense were as follows:

	March 31, 2019
	(In thousands)
Operating lease cost	$	12,124
Finance lease cost
Amortization of leased assets	1,066
Interest on lease liabilities	214
Total Finance lease cost	1,280
Net lease cost	$	13,404

Rent expense was $12.8 million for three months ended March 31, 2018.

Other information related to leases was as follows:

	March 31, 2019
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	6,577
Operating cash flows for finance leases	211
Financing cash flows for finance leases	1,229
Weighted Average Remaining Lease Term (Years)
Operating leases	5.20
Finance leases	4.56
Weighted Average Discount Rate
Operating leases	4.4		%
Finance leases	4.9		%

Future minimum lease payments under non-cancellable leases were as follows:

	March 31, 2019						December 31, 2018
	Operating Leases			Finance Leases			Operating Leases		Finance Leases
	(In thousands)
2019 - Remaining	$	24,576		$	5,268		$	32,461	$	6,430
2020	27,599			4,753			24,630		4,555
2021	19,321			4,830			17,676		4,748
2022	11,210			955			10,942		936
2023	9,147			950			9,008		936
Thereafter	26,098			3,868			26,070		3,807
Total future minimum lease payments	117,951			20,624			$	120,787	$	21,412
Less: Imputed interest	(14,240		)	(2,490		)
Total	$	103,711		$	18,134

Leases

Leases

We lease certain machinery and equipment, office space, and manufacturing facilities. Leases with an initial term of 12 months or less are not recorded on the balance sheet and we recognize lease expense for these leases on a straight-line basis over the lease term. We account for lease components (e.g., fixed payments including rent, real estate taxes and insurance costs) combined with the non-lease components (e.g., common-area maintenance costs). We use our incremental borrowing rate based on the information available at the lease commencement date to determine the lease liability. Our leases have remaining lease terms ranging from less than one year to 87 years. For purposes of calculating our lease liabilities, our lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise those options. Certain leases also include options to purchase the leased property.

The components of lease expense were as follows:

	March 31, 2019
	(In thousands)
Operating lease cost	$	12,124
Finance lease cost
Amortization of leased assets	1,066
Interest on lease liabilities	214
Total Finance lease cost	1,280
Net lease cost	$	13,404

Rent expense was $12.8 million for three months ended March 31, 2018.

Other information related to leases was as follows:

	March 31, 2019
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	6,577
Operating cash flows for finance leases	211
Financing cash flows for finance leases	1,229
Weighted Average Remaining Lease Term (Years)
Operating leases	5.20
Finance leases	4.56
Weighted Average Discount Rate
Operating leases	4.4		%
Finance leases	4.9		%

Future minimum lease payments under non-cancellable leases were as follows:

	March 31, 2019						December 31, 2018
	Operating Leases			Finance Leases			Operating Leases		Finance Leases
	(In thousands)
2019 - Remaining	$	24,576		$	5,268		$	32,461	$	6,430
2020	27,599			4,753			24,630		4,555
2021	19,321			4,830			17,676		4,748
2022	11,210			955			10,942		936
2023	9,147			950			9,008		936
Thereafter	26,098			3,868			26,070		3,807
Total future minimum lease payments	117,951			20,624			$	120,787	$	21,412
Less: Imputed interest	(14,240		)	(2,490		)
Total	$	103,711		$	18,134

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Interim Financial Statements (Policies)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation. The Consolidated Financial Statements and related disclosures as of March 31, 2019, and for the three months ended March 31, 2019 and 2018, are unaudited, pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”). The December 31, 2018, Consolidated Balance Sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S.”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. In our opinion, these financial statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods. These financial statements should be read in conjunction with the financial statements included in our Annual Report for the year ended December 31, 2018, filed on Form 10-K with the SEC on February 22, 2019. The results of operations for the three months ended March 31, 2019, are not necessarily indicative of the results to be expected for the full year. Unless the context otherwise requires, all references to “Amkor,” “we,” “us,” “our” or the “company” are to Amkor Technology, Inc. and our subsidiaries.

Use of Estimates

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.

Goodwill

Goodwill. The balance of goodwill in our Consolidated Balance Sheets reflects adjustments for foreign currency translation.

Unbilled Receivables

Unbilled Receivables. Total unbilled receivables as of March 31, 2019 and December 31, 2018 were $82.6 million and $89.3 million, respectively.

Recently Adopted Standards

Recently Adopted Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which was subsequently amended and clarified. Topic 842 requires a dual approach for lease accounting under which a lessee would account for leases as finance leases or operating leases. The standard also requires the lessee to recognize a right-of-use asset and a corresponding lease liability for both finance leases and operating leases. For finance leases, the lessee recognizes interest expense and amortization of the right-of-use asset, and for operating leases, the lessee recognizes a straight-line lease expense. The standard permits the use of two alternative transition approaches, either with application in all comparative periods presented, or with application beginning with the effective date without restating comparative period financial statements.

Effective January 1, 2019, we adopted the requirements of Topic 842 using the modified transition approach without restating the comparative period financial statements. The new standard resulted in increases in our operating lease right of use asset, accrued expenses and long-term operating lease liability account balances to record our operating leases on our Consolidated Balance Sheet. The new standard also resulted in additional disclosures for our operating and finance leases (Note 10).

In accordance with Topic 842, we applied practical expedients permitted under the transition guidance, which allowed us to not:

• Reassess whether any existing contracts are or contain a lease,

• Reassess the lease classification for any existing contracts,

• Reassess initial direct costs for any existing leases, and

• Separate non-lease components from lease components and instead to account for them as a single lease component for all asset classes.

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. Based on current projections of future taxable income in foreign jurisdictions, foreign deferred tax assets of $14.9 million are not expected to be realized, including certain tax credit carryforwards that are expected to expire unused.

We maintain a valuation allowance on a portion of our U.S. net deferred tax assets for deferred interest expense carryforwards, net operating loss carryforwards and foreign tax credit carryforwards that are expected to expire unused. 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.

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Net Sales by Product Group and End Market (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Net sales by product group and end market

Net sales by end market consist of the following:

	For the Three Months Ended March 31,
	2019		2018
Communications (smartphones, tablets, handheld devices)	38	%	42	%
Automotive, industrial and other (driver assist, infotainment, safety, performance)	28	%	26	%
Computing (datacenter, infrastructure, PC/laptop, storage)	20	%	19	%
Consumer (set-top boxes, televisions, connected home, personal electronics, visual imaging)	14	%	13	%
Total net sales	100	%	100	%

Net sales by product group consist of the following:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Advanced products (1)	$	422,446	$	475,752
Mainstream products (2)	472,518		549,567
Total net sales	$	894,964	$	1,025,319

(1) Advanced products include flip chip and wafer-level processing and related test services

(2) Mainstream products include wirebond packaging and related test services

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Other Income and Expense (Tables)

3 Months Ended

Mar. 31, 2019

Other Income and Expenses [Abstract]

Schedule of other income and expense

Other income and expense consists of the following:

	For the Three Months Ended March 31,
	2019			2018
	(In thousands)
Interest income	$	(2,064	)	$	(988	)
Foreign currency (gain) loss, net	(2,013		)	4,713
Other	(488		)	(293		)
Other (income) expense, net	$	(4,565	)	$	3,432

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019			2018
	(In thousands, except per share data)
Net income (loss) attributable to Amkor common stockholders	$	(22,879	)	$	9,544
Weighted-average number of common shares outstanding — basic	239,414			239,214
Effect of dilutive securities:
Stock options and restricted share awards	—			602
Weighted-average number of common shares outstanding — diluted	239,414			239,816
Net income (loss) attributable to Amkor per common share:
Basic	$	(0.10	)	$	0.04
Diluted	(0.10		)	0.04

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 March 31,
	2019	2018
	(In thousands)
Stock options and restricted share awards	7,123	3,369

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2019

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:

	Defined Benefit Pension			Foreign Currency Translation			Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2018	$	2,659		$	21,153		$	23,812
Other comprehensive income (loss) before reclassifications	—			(2,224		)	(2,224		)
Amounts reclassified from accumulated other comprehensive income (loss)	(132		)	—			(132		)
Other comprehensive income (loss)	(132		)	(2,224		)	(2,356		)
Accumulated other comprehensive income (loss) at March 31, 2019	$	2,527		$	18,929		$	21,456

	Defined Benefit Pension			Foreign Currency Translation		Total
	(In thousands)
Accumulated other comprehensive income (loss) at December 31, 2017	$	6,303		$	16,216	$	22,519
Other comprehensive income (loss) before reclassifications	—			15,091		15,091
Amounts reclassified from accumulated other comprehensive income (loss)	(39		)	—		(39		)
Other comprehensive income (loss)	(39		)	15,091		15,052
Accumulated other comprehensive income (loss) at March 31, 2018	$	6,264		$	31,307	$	37,571

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Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2019

Property, Plant and Equipment [Abstract]

Summary of property, plant and equipment and depreciation expense

Property, plant and equipment consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Land	$	222,635		$	222,884
Land use rights (1)	—			26,845
Buildings and improvements	1,549,252			1,523,065
Machinery and equipment	5,217,555			5,196,930
Finance lease assets	24,016			25,874
Software and computer equipment	216,879			213,440
Furniture, fixtures and other equipment	17,186			17,204
Construction in progress	32,699			44,381
Total property, plant and equipment	7,280,222			7,270,623
Accumulated depreciation and amortization	(4,716,045		)	(4,620,175		)
Total property, plant and equipment, net	$	2,564,177		$	2,650,448

(1) Effective January 1, 2019, and in connection with the adoption of Topic 842, land use rights were reclassified to operating lease right of use asset within our Consolidated Balance Sheet.

The following table summarizes our depreciation expense:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Depreciation expense	$	135,493	$	142,004

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2019

Payables and Accruals [Abstract]

Summary of accrued expenses

Accrued expenses consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Payroll and benefits	$	84,558	$	124,943
Short-term operating lease liability	29,835		—
Income taxes payable	27,114		38,567
Accrued interest	20,062		10,302
Deferred revenue and customer advances	16,573		16,736
Accrued severance plan obligations	14,697		13,179
Other accrued expenses	52,957		54,482
Total accrued expenses	$	245,796	$	258,209

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Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Summary of short-term borrowings and long-term debt

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

	March 31, 2019			December 31, 2018
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.375% Senior notes, due October 2022 (1)	$	524,971		$	524,971
6.625% Senior notes, due September 2027 (1)	525,000			—
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
$30 million revolving credit facility, LIBOR plus the applicable bank rate, due October 2019 (2)	—			—
Term loan, fixed rate at 3.70%, due May 2020	120,000			120,000
Term loan, fund floating rate plus 1.60%, due June 2020 (3)	96,000			125,000
Term loan, LIBOR plus 2.56%, due December 2023	200,000			200,000
Term loan, applicable bank rate plus 1.98%, due December 2028 (3)	54,000			24,000
J-Devices Corporation:
Short-term term loans, variable rate (4)	27,368			8,232
Term loan, fixed rate at 0.86%, due June 2022	29,316			31,908
Term loan, fixed rate at 0.60%, due July 2022	6,314			6,838
Term loan, fixed rate at 1.30%, due July 2023	211,077			225,180
Amkor Assembly & Test (Shanghai) Co., Ltd. (5):
Term loan, LIBOR plus 1.80%, due December 2019 (6)	28,000			48,000
Term loan, LIBOR plus 1.60%, due March 2022 (6)	20,000			—
Other:
$250 million senior secured revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) (7)	—			—
Revolving credit facility, TAIFX plus the applicable bank rate, due November 2020 (Taiwan) (8)	20,000			20,000
	1,862,046			1,334,129
Less: Unamortized premium, discount and deferred debt costs, net	(8,082		)	(1,818		)
Less: Short-term borrowings and current portion of long-term debt	(638,702		)	(114,579		)
Long-term debt	$	1,215,262		$	1,217,732

(1) In March 2019, we issued a redemption notice for the outstanding $525 million aggregate principal amount of our 6.375% Senior Notes due 2022 ("2022 Notes"). The redemption was completed in April 2019. In accordance with the terms of the indenture governing the 2022 Notes, the redemption price was 101.594% of the principal amount of the 2022 Notes plus accrued and unpaid interest. We expect to record a one-time charge in the second quarter of 2019 of approximately $8.0 million for early extinguishment of debt. The redemption of the 2022 Notes was funded with net proceeds from our issuance of $525 million of 6.625% Senior Notes due September 2027 ("2027 Notes") in March 2019, together with cash on hand. The 2027 Notes were issued at a discount of 99.5% or $2.6 million and are senior unsecured obligations. Interest is payable semiannually on March 15 and September 15 of each year, commencing September 15, 2019. We incurred $3.6 million of debt issuance costs associated with the 2027 Notes.

(2) In October 2018, we entered into a revolving credit facility agreement with availability of $30.0 million. Principal will be payable at the maturity date of October 2019. Interest will be payable monthly in arrears, at LIBOR plus the applicable bank rate. As of March 31, 2019, $30.0 million was available to be drawn.

(3) In May 2015, we entered into a term loan agreement pursuant to which we may borrow up to $150.0 million for capital expenditures. Principal is payable at maturity in June 2020. Interest is payable quarterly in arrears, at a fund floating rate plus 1.60% (4.70% as of March 31, 2019). In February 2019, we repaid $29.0 million of the outstanding balance of this term loan using the proceeds from our term loan due December 2028.

In December 2018, we entered into a term loan agreement pursuant to which we may borrow up to $90.0 million for capital expenditures. In February 2019, we borrowed $30.0 million of this term loan and used the proceeds to repay part of the term loan due June 2020. Principal of this term loan is payable in semiannual installments beginning June 2022 and ending at maturity date of December 2028. Interest is payable quarterly in arrears, at the applicable bank rate plus 1.98% (4.62% as of March 31, 2019). As of March 31, 2019, $36.0 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 March 31, 2019 is at TIBOR plus 0.17% to 0.26% (weighted average of 0.20% as of March 31, 2019). As of March 31, 2019, $4.0 million was available to be drawn.

(5) In April 2019, we entered into a term loan agreement with availability of $20.0 million. Principal will be payable in semiannual installments of $0.5 million, with the remaining balance due at maturity, three years after the first borrowing. Interest will be payable quarterly at a floating rate of LIBOR plus 1.40%.

(6) In December 2016, we entered into a $50.0 million term loan agreement. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity date of December 2019. Interest is payable quarterly at a floating rate of LIBOR plus 1.80% (4.60% as of March 31, 2019). In March 2019, we repaid $20.0 million of the outstanding balance of this term loan using the proceeds from our term loan due March 2022.

In March 2019, we entered into a $30.0 million term loan agreement due March 2022. We borrowed $20.0 million under this term loan and repaid part of the term loan due December 2019. Principal is payable in semiannual installments of $0.5 million, with the remaining balance due at maturity. Interest is payable quarterly at a floating rate of LIBOR plus 1.60% (4.21% as of March 31, 2019). As of March 31, 2019, $10.0 million was available to be drawn. In April 2019, we borrowed an additional $10.0 million of this new term loan and used the proceeds along with cash on hand to repay the remaining $28.0 million outstanding of the term loan due December 2019.

(7) 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 availability for our revolving credit facility is based on the amount of eligible accounts receivable. As of March 31, 2019, we had availability of $176.0 million with no outstanding standby letters of credit.

(8) In November 2015, we entered into a $39.0 million revolving credit facility. Principal is payable at maturity. Interest is payable monthly, at TAIFX plus the applicable bank rate (3.78% as of March 31, 2019). As of March 31, 2019, $19.0 million was available to be drawn.

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Pension Plans (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019			2018
	(In thousands)
Service cost	$	7,977		$	8,416
Interest cost	1,324			1,243
Expected return on plan assets	(1,618		)	(1,442		)
Recognized actuarial gain	(94		)	(35		)
Net periodic pension cost	$	7,589		$	8,182

Summary of defined contribution expense

The following table summarizes our defined contribution expense:

	For the Three Months Ended March 31,
	2019		2018
	(In thousands)
Defined contribution expense	$	4,405	$	3,996

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Recurring fair value measurements

Recurring fair value measurements consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Cash equivalent money market funds (Level 1)	$	463,245	$	74,407
Restricted cash money market funds (Level 1)	2,589		2,589

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:

	March 31, 2019				December 31, 2018
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,067,500	$	1,043,595	$	526,131	$	524,978
Revolving credit facilities and term loans (Level 2)	815,432		810,369		803,867		807,333
Total debt	$	1,882,932	$	1,853,964	$	1,329,998	$	1,332,311

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Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Components of Lease Expense

Other information related to leases was as follows:

	March 31, 2019
Supplemental Cash Flows Information (in thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	6,577
Operating cash flows for finance leases	211
Financing cash flows for finance leases	1,229
Weighted Average Remaining Lease Term (Years)
Operating leases	5.20
Finance leases	4.56
Weighted Average Discount Rate
Operating leases	4.4		%
Finance leases	4.9		%

The components of lease expense were as follows:

	March 31, 2019
	(In thousands)
Operating lease cost	$	12,124
Finance lease cost
Amortization of leased assets	1,066
Interest on lease liabilities	214
Total Finance lease cost	1,280
Net lease cost	$	13,404

Maturity of Finance Lease Liabilities

Future minimum lease payments under non-cancellable leases were as follows:

	March 31, 2019						December 31, 2018
	Operating Leases			Finance Leases			Operating Leases		Finance Leases
	(In thousands)
2019 - Remaining	$	24,576		$	5,268		$	32,461	$	6,430
2020	27,599			4,753			24,630		4,555
2021	19,321			4,830			17,676		4,748
2022	11,210			955			10,942		936
2023	9,147			950			9,008		936
Thereafter	26,098			3,868			26,070		3,807
Total future minimum lease payments	117,951			20,624			$	120,787	$	21,412
Less: Imputed interest	(14,240		)	(2,490		)
Total	$	103,711		$	18,134

Maturity of Operating Lease Liabilities

Future minimum lease payments under non-cancellable leases were as follows:

	March 31, 2019						December 31, 2018
	Operating Leases			Finance Leases			Operating Leases		Finance Leases
	(In thousands)
2019 - Remaining	$	24,576		$	5,268		$	32,461	$	6,430
2020	27,599			4,753			24,630		4,555
2021	19,321			4,830			17,676		4,748
2022	11,210			955			10,942		936
2023	9,147			950			9,008		936
Thereafter	26,098			3,868			26,070		3,807
Total future minimum lease payments	117,951			20,624			$	120,787	$	21,412
Less: Imputed interest	(14,240		)	(2,490		)
Total	$	103,711		$	18,134

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Interim Financial Statements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unbilled receivables	$ 82.6	$ 89.3

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Net Sales by Product Group and End Market - Net Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales by product group	$ 894,964	$ 1,025,319
Advanced products
Disaggregation of Revenue [Line Items]
Net sales by product group	422,446	475,752
Mainstream products
Disaggregation of Revenue [Line Items]
Net sales by product group	$ 472,518	$ 549,567

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Net Sales by Product Group and End Market - Net Sales by End Market (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%
Revenue from Contract with Customer | End Market | Communications (smartphones, tablets, handheld devices)
Disaggregation of Revenue [Line Items]
Total net sales	38.00%	42.00%
Revenue from Contract with Customer | End Market | Automotive, industrial and other (driver assist, infotainment, safety, performance)
Disaggregation of Revenue [Line Items]
Total net sales	28.00%	26.00%
Revenue from Contract with Customer | End Market | Computing (datacenter, infrastructure, PC/laptop, storage)
Disaggregation of Revenue [Line Items]
Total net sales	20.00%	19.00%
Revenue from Contract with Customer | End Market | Consumer (set-top boxes, televisions, connected home, personal electronics, visual imaging)
Disaggregation of Revenue [Line Items]
Total net sales	14.00%	13.00%

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Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Interest income	$ (2,064)	$ (988)
Foreign currency (gain) loss, net	(2,013)	4,713
Other	(488)	(293)
Other (income) expense, net	$ (4,565)	$ 3,432

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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 21,380	$ 2,481
Amount of change in deferred tax assets valuation allowance	14,900
Gross unrecognized tax benefits	25,200		$ 25,300
Foreign Tax Authority
Income Tax Contingency [Line Items]
Potential decrease in unrecognized tax benefits in the next 12 months	$ 14,900

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Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to Amkor common stockholders	$ (22,879)	$ 9,544
Weighted-average number of common shares outstanding — basic	239,414	239,214
Effect of dilutive securities:
Stock options and restricted share awards (in shares)	0	602
Weighted-average number of common shares outstanding — diluted	239,414	239,816
Net income (loss) attributable to Amkor per common share:
Basic (in dollars per share)	$ (0.10)	$ 0.04
Diluted (in dollars per share)	$ (0.10)	$ 0.04

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Earnings Per Share - Summary of Potential Shares of Common Stock Excluded from Diluted EPS (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock options and restricted share awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted share awards	7,123	3,369

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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,855,900	$ 1,719,709
Total other comprehensive income (loss)	(2,356)	15,052
Balance at end of period	1,832,582	1,747,074
Defined Benefit Pension
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	2,659	6,303
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(132)	(39)
Total other comprehensive income (loss)	(132)	(39)
Balance at end of period	2,527	6,264
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	21,153	16,216
Other comprehensive income (loss) before reclassifications	(2,224)	15,091
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss)	(2,224)	15,091
Balance at end of period	18,929	31,307
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	23,812	22,519
Other comprehensive income (loss) before reclassifications	(2,224)	15,091
Amounts reclassified from accumulated other comprehensive income (loss)	(132)	(39)
Total other comprehensive income (loss)	(2,356)	15,052
Balance at end of period	$ 21,456	$ 37,571

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Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 155.7	$ 225.5
Discounts and Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 1.2	$ 1.8

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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 7,280,222	$ 7,270,623
Accumulated depreciation and amortization	(4,716,045)	(4,620,175)
Total property, plant and equipment, net	2,564,177	2,650,448
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	222,635	222,884
Land use rights
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	0	26,845
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,549,252	1,523,065
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	5,217,555	5,196,930
Finance lease assets
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	24,016	25,874
Software and computer equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	216,879	213,440
Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	17,186	17,204
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 32,699	$ 44,381

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Property, Plant and Equipment - Summary of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 135,493	$ 142,004

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Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Payroll and benefits	$ 84,558	$ 124,943
Short-term operating lease liability	29,835	0
Income taxes payable	27,114	38,567
Accrued interest	20,062	10,302
Deferred revenue and customer advances	16,573	16,736
Accrued severance plan obligations	14,697	13,179
Other accrued expenses	52,957	54,482
Total accrued expenses	$ 245,796	$ 258,209

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Debt (Details) - USD ($)	1 Months Ended				3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Dec. 31, 2016	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Feb. 22, 2019	Dec. 31, 2018	Oct. 31, 2018	Jul. 31, 2018	Nov. 30, 2015	May 31, 2015
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 1,862,046,000				$ 1,862,046,000			$ 1,334,129,000
Less: Unamortized premium, discount and deferred debt costs, net		(8,082,000)				(8,082,000)			(1,818,000)
Less: Short-term borrowings and current portion of long-term debt		(638,702,000)				(638,702,000)			(114,579,000)
Long-term debt		1,215,262,000				1,215,262,000			1,217,732,000
Repayments of long-term debt						63,636,000	$ 6,220,000
Term loan, LIBOR plus 1.80%, due December 2019 (China) | China
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		28,000,000				$ 28,000,000			48,000,000
Basis spread on variable rate (as a percent)						1.80%
Face amount of debt				$ 50,000,000
Repayments of long-term debt		$ 20,000,000
Interest rate at period end (as a percent)		4.60%				4.60%
Semiannual installment payments				$ 500,000
Term loan, LIBOR plus 1.80%, due December 2019 (China) | China | Subsequent Event
Debt Instrument [Line Items]
Repayments of long-term debt	$ 28,000,000
Term loan, LIBOR plus 1.80%, due December 2019 (China) | China | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						1.80%
Term loan, LIBOR plus 1.60%, due March 2022 | China
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 20,000,000				$ 20,000,000			0
Basis spread on variable rate (as a percent)						1.60%
Face amount of debt		30,000,000				$ 30,000,000
Remaining borrowing capacity		$ 10,000,000				$ 10,000,000
Interest rate at period end (as a percent)		4.21%				4.21%
Semiannual installment payments		$ 500,000
Proceeds from revolving credit facilities		20,000,000
Term loan, LIBOR plus 1.60%, due March 2022 | China | Subsequent Event
Debt Instrument [Line Items]
Proceeds from revolving credit facilities	$ 10,000,000
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%
Line of Credit | $250 million revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		0				$ 0			0
Credit facility, borrowing capacity		250,000,000.0				250,000,000.0					$ 250,000,000
Remaining borrowing capacity		176,000,000				$ 176,000,000
Line of Credit | $250 million revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						1.25%
Line of Credit | $250 million revolving credit facility, LIBOR plus 1.25%-1.75%, due July 2023 (Singapore) | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						1.75%
Line of Credit | Revolving credit facility, TAIFX plus a bank-determined spread, due November 2020 (Taiwan) | Revolving Credit Facility | Taiwan
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		20,000,000				$ 20,000,000			20,000,000
Credit facility, borrowing capacity												$ 39,000,000
Remaining borrowing capacity		$ 19,000,000				$ 19,000,000
Interest rate at period end (as a percent)		3.78%				3.78%
Senior Notes | 6.375% Senior notes, due October 2022
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 524,971,000				$ 524,971,000			524,971,000
Stated interest rate (as a percent)		6.375%				6.375%
Face amount of debt		$ 525,000,000				$ 525,000,000
Debt redemption price		101.594%
Senior Notes | 6.375% Senior notes, due October 2022 | Scenario, Forecast
Debt Instrument [Line Items]
Early extinguishment of debt					$ 8,000,000
Senior Notes | 6.625% Senior notes, due September 2027
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 525,000,000				$ 525,000,000			0
Stated interest rate (as a percent)		6.625%				6.625%
Face amount of debt		$ 525,000,000				$ 525,000,000
Debt discount percentage of par		99.50%				99.50%
Debt discount		$ 2,600,000				$ 2,600,000
Debt issuance costs		3,600,000				3,600,000
Subsidiary Term Loans | $30 million revolving credit facility, LIBOR plus the applicable bank rate, due October 2019 (2) | Korea
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		0				0			0
Credit facility, borrowing capacity		30,000,000				30,000,000				$ 30,000,000
Remaining borrowing capacity		30,000,000				30,000,000
Subsidiary Term Loans | Term loan, fund floating rate plus 1.60%, due June 2020 | Korea
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 96,000,000				$ 96,000,000			125,000,000
Basis spread on variable rate (as a percent)						1.60%
Credit facility, borrowing capacity													$ 150,000,000
Repayments of long-term debt			$ 29,000,000
Interest rate at period end (as a percent)		4.70%				4.70%
Subsidiary Term Loans | Term loan, LIBOR plus 2.56%, due December 2023 | Korea
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 200,000,000				$ 200,000,000			200,000,000
Subsidiary Term Loans | Term loan, LIBOR plus 2.56%, due December 2023 | Korea | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						2.56%
Subsidiary Term Loans | Term loan, applicable bank rate plus 1.98%, due December 2028 | Korea
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		54,000,000				$ 54,000,000			24,000,000
Basis spread on variable rate (as a percent)						1.98%
Credit facility, borrowing capacity									90,000,000
Face amount of debt								$ 30,000,000
Remaining borrowing capacity		$ 36,000,000				$ 36,000,000
Interest rate at period end (as a percent)		4.62%				4.62%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 27,368,000				$ 27,368,000			8,232,000
Remaining borrowing capacity		4,000,000				$ 4,000,000
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | TIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						0.17%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | TIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						0.26%
Subsidiary Term Loans | Short-term term loans, variable rate | Japan | TIBOR | Weighted Average
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)						0.20%
Subsidiary Term Loans | Term loan, fixed rate at 0.86%, due June 2022 | Japan
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 29,316,000				$ 29,316,000			31,908,000
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]
Short-term borrowings and long-term debt		$ 6,314,000				$ 6,314,000			6,838,000
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]
Short-term borrowings and long-term debt		$ 211,077,000				$ 211,077,000			225,180,000
Stated interest rate (as a percent)		1.30%				1.30%
Term Loan | Term loan, fixed rate at 3.70%, due May 2020 | Korea
Debt Instrument [Line Items]
Short-term borrowings and long-term debt		$ 120,000,000				$ 120,000,000			$ 120,000,000
Stated interest rate (as a percent)		3.70%				3.70%
Term Loan | Amkor Assembly & Test (Shanghai) Co., Ltd. Term Loan | China | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.40%
Face amount of debt	$ 20,000,000
Semiannual installment payments	$ 500,000
Term of debt instrument	3 years

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Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Service cost	$ 7,977	$ 8,416
Interest cost	1,324	1,243
Expected return on plan assets	(1,618)	(1,442)
Recognized actuarial gain	(94)	(35)
Net periodic pension cost	$ 7,589	$ 8,182

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Pension Plans - Summary of Defined Contribution Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Defined contribution expense	$ 4,405	$ 3,996

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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - Level 1 - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalent money market funds	$ 463,245	$ 74,407
Restricted cash money market funds	$ 2,589	$ 2,589

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Fair Value Measurements - Fair Value of Financial Instruments Not Recorded at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 1,882,932	$ 1,329,998
Fair Value | Senior notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,067,500	526,131
Fair Value | Revolving credit facilities and term loans | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	815,432	803,867
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,853,964	1,332,311
Carrying Value | Senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	1,043,595	524,978
Carrying Value | Revolving credit facilities and term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 810,369	$ 807,333

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Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 12,124
Amortization of leased assets	1,066
Interest on lease liabilities	214
Total Finance lease cost	1,280
Net lease cost	13,404
Rent expense		$ 12,800
Operating cash flows for operating leases	6,577
Operating cash flows for finance leases	211
Financing cash flows for finance leases	$ 1,229
Operating leases, Weighted average remaining lease term (years)	5 years 2 months 12 days
Finance leases, Weighted average remaining lease term (years)	4 years 6 months 22 days
Operating leases, Weighted average discount rate	4.40%
Finance leases, Weighted average discount rate	4.90%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	87 years

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Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
2019 - Remaining	$ 24,576
2019		$ 32,461
2020	27,599	24,630
2021	19,321	17,676
2022	11,210	10,942
2023	9,147	9,008
Thereafter	26,098	26,070
Total future minimum lease payments	117,951	120,787
Less: Imputed interest	(14,240)
Total	103,711
Finance Leases
2019 - Remaining	5,268
2019		6,430
2020	4,753	4,555
2021	4,830	4,748
2022	955	936
2023	950	936
Thereafter	3,868	3,807
Total future minimum lease payments	20,624	$ 21,412
Less: Imputed interest	(2,490)
Total	$ 18,134