CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) AND COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss), Net	Accumulated Earnings	Treasury Stock
Beginning Balance at Dec. 31, 2008	$ (21,316)	$ 78	$ 570,667	$ (1,741)	$ 426,428	$ (1,016,748)
Comprehensive income:
Net income	82,964				82,964
Other comprehensive (loss) income:
Foreign currency translation adjustments	9,088			9,088
Interest rate swaps, net of tax	3,535			3,535
Pension unrecognized (loss) gain, net of tax	440			440
Other comprehensive (loss) income	13,063			13,063
Comprehensive income	96,027
Issuances under stock plans	14,849		(6,522)			21,371
Excess tax benefits from stock compensation	653		653
Purchase of shares for treasury	(3,744)					(3,744)
Stock compensation expense	26,066		26,066
Ending Balance at Dec. 31, 2009	112,535	78	590,864	11,322	509,392	(999,121)
Comprehensive income:
Net income	96,285				96,285
Other comprehensive (loss) income:
Foreign currency translation adjustments	582			582
Interest rate swaps, net of tax	3,746			3,746
Pension unrecognized (loss) gain, net of tax	(1,012)			(1,012)
Other comprehensive (loss) income	3,316			3,316
Comprehensive income	99,601
Issuances under stock plans	23,568		(30,254)			53,822
Excess tax benefits from stock compensation	18,520		18,520
Purchase of shares for treasury	(99,820)					(99,820)
Stock compensation expense	32,652		32,652
Ending Balance at Dec. 31, 2010	187,056	78	611,782	14,638	605,677	(1,045,119)
Comprehensive income:
Net income	136,902				136,902
Other comprehensive (loss) income:
Foreign currency translation adjustments	(4,454)			(4,454)
Interest rate swaps, net of tax	(4,674)			(4,674)
Pension unrecognized (loss) gain, net of tax	283			283
Other comprehensive (loss) income	(8,845)			(8,845)
Comprehensive income	128,057
Issuances under stock plans	20,045		(23,579)			43,624
Excess tax benefits from stock compensation	25,778		25,778
Purchase of shares for treasury	(211,986)					(211,986)
Stock compensation expense	32,834		32,834
Ending Balance at Dec. 31, 2011	$ 181,784	$ 78	$ 646,815	$ 5,793	$ 742,579	$ (1,213,481)