Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 381,132	$ 434,631
Restricted cash	2,680	2,680
Accounts receivable:
Trade, net of allowances	345,764	298,543
Other	19,746	27,197
Inventories	205,400	198,427
Other current assets	37,683	35,352
Total current assets	992,405	996,830
Property, plant and equipment, net	1,691,540	1,656,214
Intangibles, net	7,260	8,382
Investments	36,567	36,707
Restricted cash	2,279	4,001
Other assets	74,161	70,913
Total assets	2,804,212	2,773,047
Current liabilities:
Short-term borrowings and current portion of long-term debt	53,027	59,395
Trade accounts payable	424,163	424,504
Accrued expenses	173,572	158,287
Total current liabilities	650,762	642,186
Long-term debt	1,076,640	1,062,256
Long-term debt, related party	225,000	225,000
Pension and severance obligations	125,413	129,096
Other non-current liabilities	19,003	13,288
Total liabilities	2,096,818	2,071,826
Commitments and contingencies (see 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, 197,517 and 197,359 shares issued, and 167,760 and 168,628 shares outstanding, in 2012 and 2011, respectively	198	197
Additional paid-in capital	1,612,112	1,611,242
Accumulated deficit	(786,688)	(798,462)
Accumulated other comprehensive income	9,427	10,849
Treasury stock, at cost, 29,757 and 28,731 shares in 2012 and 2011, respectively	(135,418)	(130,560)
Total Amkor stockholders' equity:	699,631	693,266
Noncontrolling interests in subsidiaries	7,763	7,955
Total equity	707,394	701,221
Total liabilities and equity	$ 2,804,212	$ 2,773,047