CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2009	$ 1,066,111	$ 23,552	$ 434,505	$ 577,435	$ 30,619
Beginning Balance, Shares at Dec. 31, 2009		47,104
Exercise of stock options	1,427	92	1,335
Exercise of stock options, Shares		184
Stock-based compensation	17,377	209	17,168
Stock-based compensation, Shares		418
Excess income taxes from stock-based compensation	1,491		1,491
Net loss	(19,586)			(19,586)
Other comprehensive income (loss)	1,711				1,711
Ending Balance at Dec. 31, 2010	1,068,531	23,853	454,499	557,849	32,330
Ending Balance, shares at Dec. 31, 2010		47,706
Stock-based compensation	15,032	210	14,822
Stock-based compensation, Shares		419
Excess income taxes from stock-based compensation	(612)		(612)
Net loss	(33,472)			(33,472)
Other comprehensive income (loss)	(11,854)				(11,854)
Ending Balance at Dec. 31, 2011	1,037,625	24,063	468,709	524,377	20,476
Ending Balance, shares at Dec. 31, 2011		48,125
Stock-based compensation	13,728	141	13,587
Stock-based compensation, Shares		284
Excess income taxes from stock-based compensation	(1,701)		(1,701)
Net loss	(100,060)			(100,060)
Other comprehensive income (loss)	(16,058)				(16,058)
Ending Balance at Dec. 31, 2012	$ 933,534	$ 24,204	$ 480,595	$ 424,317	$ 4,418
Ending Balance, shares at Dec. 31, 2012		48,409