Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 466,702	$ 413,048
Restricted cash	2,680	2,680
Accounts receivable:
Trade, net of allowances	379,370	389,699
Other	2,853	13,098
Inventories	235,330	227,439
Other current assets	45,778	45,444
Total current assets	1,132,713	1,091,408
Property, plant and equipment, net	1,825,161	1,819,969
Intangibles, net	4,226	4,766
Investments	35,560	38,690
Restricted cash	2,248	2,308
Other assets	74,823	68,074
Total assets	3,074,731	3,025,215
Current liabilities:
Short-term borrowings and current portion of long-term debt	0	0
Trade accounts payable	432,599	439,663
Accrued expenses	232,185	212,964
Total current liabilities	664,784	652,627
Long-term debt	1,353,000	1,320,000
Long-term debt, related party	225,000	225,000
Pension and severance obligations	135,578	139,379
Other non-current liabilities	19,475	21,415
Total liabilities	2,397,837	2,358,421
Commitments and contingencies (Note 16)
Amkor stockholders' equity:
Preferred stock, $0.001 par value, 10,000 shares authorized, designated Series A, none issued
Common stock, $0.001 par value, 500,000 shares authorized, 197,758 and 197,709 shares issued, and 152,427 and 152,397 shares outstanding, in 2013 and 2012, respectively	198	198
Additional paid-in capital	1,614,677	1,614,143
Accumulated deficit	(743,262)	(756,644)
Accumulated other comprehensive income	7,131	11,241
Treasury stock, at cost, 45,331 and 45,312 shares in 2013 and 2012, respectively	(211,073)	(210,983)
Total Amkor stockholders' equity	667,671	657,955
Noncontrolling interests in subsidiaries	9,223	8,839
Total equity	676,894	666,794
Total liabilities and equity	$ 3,074,731	$ 3,025,215