Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 854,802	$ 826,744
Restricted cash	637	962
Short-term investments (amortized cost of $308,591 and $251,959 in 2022 and 2021, respectively)	307,016	251,530
Accounts receivable, net of allowances	1,201,007	1,258,767
Inventories	516,437	484,959
Other current assets	59,656	33,601
Total current assets	2,939,555	2,856,563
Property, plant and equipment, net	2,938,742	2,871,058
Operating lease right of use assets	180,883	159,742
Goodwill	23,182	24,516
Restricted cash	3,692	3,815
Other assets	139,733	122,860
Total assets	6,225,787	6,038,554
Current liabilities:
Short-term borrowings and current portion of long-term debt	156,692	153,008
Trade accounts payable	753,279	828,727
Capital expenditures payable	267,598	210,875
Short-term operating lease liability	71,229	64,233
Accrued expenses	374,319	422,892
Total current liabilities	1,623,117	1,679,735
Long-term debt	1,087,408	984,988
Pension and severance obligations	116,138	120,472
Long-term operating lease liabilities	86,300	83,937
Other non-current liabilities	186,002	196,876
Total liabilities	3,098,965	3,066,008
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued	0	0
Common stock, $0.001 par value, 500,000 shares authorized; 290,687 and 290,466 shares issued; and 244,532 and 244,315 shares outstanding in 2022 and 2021, respectively	291	290
Additional paid-in capital	1,982,113	1,977,134
Retained earnings	1,322,370	1,163,939
Accumulated other comprehensive income (loss)	10,496	19,978
Treasury stock, at cost, 46,155 and 46,151 shares in 2022 and 2021, respectively	(219,147)	(219,065)
Total Amkor stockholders’ equity	3,096,123	2,942,276
Non-controlling interests in subsidiaries	30,699	30,270
Total equity	3,126,822	2,972,546
Total liabilities and equity	$ 6,225,787	$ 6,038,554