Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Equity of the Company Preferred Stock [Member]	Equity of the Company Common Stock [Member]	Equity of the Company Treasury Stock [Member]	Equity of the Company Additional Paid-in Capital [Member]	Equity of the Company Accumulated Other Comprehensive Income (Loss) [Member]	Equity of the Company Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning balance,value at Dec. 31, 2010	$ 454,818	$ 0	$ 579	$ (322,946)	$ 349,157	$ 20,334	$ 396,602	$ 11,092
Preferred stock beginning balance, share at Dec. 31, 2010	0	0
Common stock beginning balance, share at Dec. 31, 2010	57,875,269		57,875,000
Net income	34,595						32,690	1,905
Dividends distributed to noncontrolling interest	(1,859)							(1,859)
Foreign currency translation adjustments	6,881					6,879		2
Derivatives valuation, net of tax	(6,580)					(6,580)
Vesting of restricted stock units issued out of treasury, share			441,000
Vesting of restricted stock units issued out of treasury, value	(4,795)		4	6,032	(10,831)
Exercise of stock options, share			432,000
Exercise of stock options, value	3,673		4	5,916	(2,247)
Excess tax benefit from equity-based awards	2,327				2,327
Equity-based compensation expense	7,715				7,715
Purchases of common stock, share			(2,133,000)
Purchases of common stock, value	(43,748)		(21)	(43,727)
Other	221					221
Ending balance,value at Jun. 30, 2011	$ 453,248	$ 0	$ 566	$ (354,725)	$ 346,121	$ 20,854	$ 429,292	$ 11,140
Preferred stock ending balance, share at Jun. 30, 2011	0	0
Common stock ending balance, share at Jun. 30, 2011	56,615,262		56,615,000