Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 3,129,440	$ 2,956,450	$ 2,759,546
Cost of sales	2,576,618	2,411,937	2,335,736
Gross profit	552,822	544,513	423,810
Selling, general and administrative	254,498	247,779	217,000
Research and development	76,864	64,625	54,118
Total operating expenses	331,362	312,404	271,118
Operating income	221,460	232,109	152,692
Interest expense	104,956	96,739	83,974
Interest expense, related party	4,969	9,169	13,969
Other (income) expense, net	24,543	(2,214)	(638)
Total other expense, net	(85,382)	(108,122)	(98,581)
Income before taxes and equity in earnings of unconsolidated affiliate	136,078	123,987	54,111
Income tax expense	33,845	22,646	17,001
Income before equity in earnings of unconsolidated affiliate	102,233	101,341	37,110
Equity in earnings of J-Devices	(31,654)	(10,316)	(5,592)
Net income	133,887	111,657	42,702
Net income attributable to noncontrolling interests	(3,501)	(2,361)	(884)
Net income attributable to Amkor	$ 130,386	$ 109,296	$ 41,818
Net income attributable to Amkor per common share:
Basic (in dollars per share)	$ 0.56	$ 0.58	$ 0.26
Diluted (in dollars per share)	$ 0.55	$ 0.50	$ 0.24
Shares used in computing per common share amounts:
Basic (in shares)	230,710	187,032	160,105
Diluted (in shares)	236,731	235,330	243,004