Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 1,135,027	$ 1,086,014	$ 3,038,074	$ 2,872,022
Cost of sales	918,389	872,214	2,506,295	2,403,732
Gross profit	216,638	213,800	531,779	468,290
Selling, general and administrative	75,567	72,363	220,045	216,894
Research and development	42,834	26,822	128,658	84,145
Gain on sale of real estate	0	0	(108,109)	0
Total operating expenses	118,401	99,185	240,594	301,039
Operating income	98,237	114,615	291,185	167,251
Interest expense	20,321	21,488	63,733	58,496
Interest expense, related party	180	1,243	1,715	3,727
Other (income) expense, net	3,354	6,657	11,028	9,607
Total other expense, net	23,855	29,388	76,476	71,830
Income before taxes	74,382	85,227	214,709	95,421
Income tax expense	18,752	24,086	51,764	29,319
Net income	55,630	61,141	162,945	66,102
Net income attributable to non-controlling interests	(1,195)	(1,052)	(3,009)	(2,175)
Net income attributable to Amkor	$ 54,435	$ 60,089	$ 159,936	$ 63,927
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.23	$ 0.25	$ 0.67	$ 0.27
Diluted (in dollars per share)	$ 0.23	$ 0.25	$ 0.67	$ 0.27
Shares used in computing per common share amounts:
Basic (in shares)	239,068	237,353	238,873	237,157
Diluted (in shares)	239,640	238,192	239,610	237,586