Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 1,596,816	$ 1,326,150
Cost of sales	1,271,486	1,060,616
Gross profit	325,330	265,534
Selling, general and administrative	76,959	76,768
Research and development	38,363	44,318
Total operating expenses	115,322	121,086
Operating income	210,008	144,448
Interest expense	14,148	12,673
Other (income) expense, net	(5,096)	89
Total other expense, net	9,052	12,762
Income before taxes	200,956	131,686
Income tax expense	29,728	11,667
Net income	171,228	120,019
Net income attributable to non-controlling interests	(565)	(210)
Net income attributable to Amkor	$ 170,663	$ 119,809
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.70	$ 0.49
Diluted (in dollars per share)	$ 0.69	$ 0.49
Shares used in computing per common share amounts:
Basic (in shares)	244,403	243,267
Diluted (in shares)	246,000	245,129