Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Earnings (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2008	$ 5,414	$ 635	$ 87,305	$ 455,963	$ (18,319)	$ (520,170)
Net earnings (loss)	66,768			66,768
Other comprehensive (loss) income, net of tax	14,050				14,050
Grant/exercise of stock awards	4,520	7	4,513
Stock-based compensation expense	7,109		7,109
Ending Balance at Dec. 31, 2009	97,861	642	98,927	522,731	(4,269)	(520,170)
Net earnings (loss)	385,405			385,405
Other comprehensive (loss) income, net of tax	7,568				7,568
Grant/exercise of stock awards	64,150	11	(6,064)			70,203
Stock-based compensation expense	32,125		32,125
Repurchases of common stock	(58,225)					(58,225)
Ending Balance at Dec. 31, 2010	528,884	653	124,988	908,136	3,299	(508,192)
Net earnings (loss)	113,430			113,430
Other comprehensive (loss) income, net of tax	(524)				(524)
Grant/exercise of stock awards	9,907	1	(14,015)			23,921
Stock-based compensation expense	12,908		12,908
Repurchases of common stock	(215,071)					(215,071)
Ending Balance at Dec. 31, 2011	$ 449,534	$ 654	$ 123,881	$ 1,021,566	$ 2,775	$ (699,342)