Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 989,447	$ 917,326	$ 1,903,047	$ 1,786,008
Cost of sales	817,212	785,720	1,587,906	1,531,518
Gross profit	172,235	131,606	315,141	254,490
Selling, general and administrative	67,783	70,896	144,478	144,531
Research and development	44,268	30,168	85,824	57,323
Gain on sale of real estate	(108,109)	0	(108,109)	0
Total operating expenses	3,942	101,064	122,193	201,854
Operating income	168,293	30,542	192,948	52,636
Interest expense	22,158	20,816	43,412	37,008
Interest expense, related party	293	1,242	1,535	2,484
Other (income) expense, net	(3,190)	(242)	7,674	2,950
Total other expense, net	19,261	21,816	52,621	42,442
Income before taxes	149,032	8,726	140,327	10,194
Income tax expense	32,573	3,360	33,012	5,233
Net income	116,459	5,366	107,315	4,961
Net income attributable to non-controlling interests	(952)	(653)	(1,814)	(1,123)
Net income attributable to Amkor	$ 115,507	$ 4,713	$ 105,501	$ 3,838
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.48	$ 0.02	$ 0.44	$ 0.02
Diluted (in dollars per share)	$ 0.48	$ 0.02	$ 0.44	$ 0.02
Shares used in computing per common share amounts:
Basic (in shares)	238,863	237,090	238,774	237,058
Diluted (in shares)	239,679	237,434	239,601	237,297