INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of income (loss) before income taxes
U.S.	$ 125,905,000	$ 102,590,000	$ (119,143,000)
Foreign	255,285,000	13,762,000	(16,896,000)
Income (loss) before income taxes	381,190,000	116,352,000	(136,039,000)
Federal
Current	2,454,000	(142,191,000)	9,300,000
Deferred	5,982,000	(88,291,000)
State
Current	172,000	58,000	52,000
Deferred	(2,064,000)	(20,041,000)
Foreign
Current	18,979,000	8,495,000	(20,761,000)
Deferred	40,677,000	(64,753,000)	(15,132,000)
Provision for (benefit from) income taxes	66,200,000	(306,723,000)	(26,541,000)
Company's effective tax rate
U.S. Federal statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
State tax (as a percent)	0.22%	0.65%	(2.61%)
Effect of foreign operations (as a percent)	(15.52%)	(40.37%)	(29.00%)
Recognition of tax credits (as a percent)	(2.95%)	(56.22%)	72.68%
Net operating loss and future deductions not currently benefited (as a percent)		27.82%	(40.18%)
Release of valuation allowance (as a percent)	(0.09%)	(100.33%)
Audit settlements and IRS refunds (as a percent)	0.20%	(129.42%)	(11.89%)
Other (as a percent)	0.51%	(0.75%)	(4.50%)
Effective tax provision rate (as a percent)	17.37%	(263.62%)	19.50%
Income tax benefits due to recognition of refundable foreign R&D credits related to prior years			39,900,000
Deferred income tax assets:
Net operating losses	33,324,000	89,944,000
Research and development, foreign tax and other tax credits	45,327,000	67,224,000
Accrued liabilities	33,124,000	47,867,000
Fixed assets	42,501,000	37,182,000
Intangible assets	12,356,000	13,359,000
Deferred income	8,391,000	8,252,000
Stock-based compensation	6,830,000	7,335,000
Unrealized foreign exchange translation	4,651,000
Other	4,832,000	5,803,000
Total deferred income tax assets	191,336,000	276,966,000
Deferred income tax liabilities:
Fixed assets	(57,000)	(138,000)
Unrealized foreign exchange translation		(2,506,000)
Deferred income	(693,000)	(590,000)
Unremitted earnings of foreign subsidiaries	(5,075,000)	(11,931,000)
Foreign losses subject to recapture	(15,170,000)
Other		(214,000)
Total deferred tax liabilities	(20,995,000)	(15,379,000)
Less valuation allowance	(38,742,000)	(85,755,000)
Net deferred income tax assets	131,599,000	175,832,000
Reported as:
Current deferred tax assets	10,239,000	39,295,000
Current deferred tax liabilities		(3,968,000)
Non-current deferred tax assets	121,417,000	140,562,000
Non-current deferred tax liabilities	(57,000)	(57,000)
Net deferred income tax assets	$ 131,599,000	$ 175,832,000