Consolidated Statement of Stockholders' Equity (USD $)	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, 2011	$ 470,247	$ 0	$ 566	$ (357,267)	$ 350,386	$ (5,474)	$ 470,776	$ 11,260
Preferred stock beginning balance, share at Dec. 31, 2011	0	0
Common stock beginning balance, share at Dec. 31, 2011	56,635,319		56,635
Net income	16,817						15,881	936
Acquisition of noncontrolling interest	1,365							1,365
Dividends distributed to noncontrolling interest	(720)							(720)
Foreign currency translation adjustments	8,751					8,739		12
Derivatives valuation, net of tax	7,097					7,097
Vesting of restricted stock units issued out of treasury, share			436
Vesting of restricted stock units issued out of treasury, value	(3,731)		4	6,079	(9,814)
Exercise of stock options, share			28
Exercise of stock options, value	342		0	390	(48)
Excess tax benefit from equity-based awards	(1,017)				(1,017)
Equity-based compensation expense	3,388				3,388
Purchases of common stock, share			(1,421)
Purchases of common stock, value	(22,656)		(14)	(22,642)
Other	345					345
Ending balance,value at Mar. 31, 2012	$ 480,228	$ 0	$ 556	$ (373,440)	$ 342,895	$ 10,707	$ 486,657	$ 12,853
Preferred stock ending balance, share at Mar. 31, 2012	0	0
Common stock ending balance, share at Mar. 31, 2012	55,678,427		55,678