Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Deferred Compensation Expense
Beginning Balance at Dec. 31, 2011	$ 996,860	$ 262	$ 379,673	$ 586,402	$ 31,105	$ (8,968)	$ 8,386
Beginning Balance, Shares at Dec. 31, 2011						(295)
Net loss	(2,909)			(2,909)
Issuance of common stock	1,798	2	1,796
Exercise of stock options	698	1	697
Deferred compensation plan	612		30			(146)	728
Deferred compensation plan, Shares						(2)
Gain on cash flow hedge, net of tax	1,153				1,153
Translation adjustment	19,442				19,442
Ending Balance at Mar. 31, 2012	$ 1,017,654	$ 265	$ 382,196	$ 583,493	$ 51,700	$ (9,114)	$ 9,114
Ending Balance, Shares at Mar. 31, 2012						(297)