Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Stockholders' Equity of the Company Preferred Stock [Member]	Stockholders' Equity of the Company Common Stock [Member]	Stockholders' Equity of the Company Treasury Stock [Member]	Stockholders' Equity of the Company Additional Paid-in Capital [Member]	Stockholders' Equity of the Company Accumulated Other Comprehensive Income [Member]	Stockholders' Equity of the Company Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning balance,value at Dec. 31, 2012	$ 500,337	$ 0	$ 522	$ (428,716)	$ 350,714	$ 22,981	$ 540,791	$ 14,045
Preferred stock beginning balance, share at Dec. 31, 2012	0	0
Common stock beginning balance, share at Dec. 31, 2012	52,288,567		52,288,000
Net income	18,603						17,961	642
Dividends distributed to noncontrolling interest	(1,109)							(1,109)
Foreign currency translation adjustments	3,134					3,224		(90)
Derivatives valuation, net of tax	2,180					2,180
Vesting of restricted stock units, share			340,000
Vesting of restricted stock units, value	(3,959)		3	4,851	(8,813)
Exercise of stock options, share			59,000
Exercise of stock options, value	539		1	844	(306)
Excess tax benefit from equity-based awards	414				414
Equity-based compensation expense	3,157				3,149			8
Purchases of common stock, share			(487,000)
Purchases of common stock, value	(9,850)		(5)	(9,845)
Other	162					162
Ending balance,value at Mar. 31, 2013	$ 513,608	$ 0	$ 521	$ (432,866)	$ 345,158	$ 28,547	$ 558,752	$ 13,496
Preferred stock ending balance, share at Mar. 31, 2013	0	0
Common stock ending balance, share at Mar. 31, 2013	52,200,947		52,200,000