Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	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]	Accumulated Other Comprehensive Income (Loss)	Stockholders' Equity of the Company Retained Earnings [Member]	Noncontrolling Interest [Member]	Total
Beginning balance,value at Dec. 31, 2014				$ (52,274)
Net income							$ 35,528
Dividends distributed to noncontrolling interest							(2,025)
Foreign currency translation adjustments							$ (17,345)
Ending balance,value at Jun. 30, 2015				(74,751)
Preferred stock beginning balance, share at Dec. 31, 2015							0
Common stock beginning balance, share at Dec. 31, 2015	48,481,000						48,481,323
Beginning balance,value at Dec. 31, 2015	$ 485	$ (533,744)	$ 347,251	(101,365)	$ 720,989	$ 7,201	$ 440,817
Net income					22,841	1,606	24,447
Dividends to shareholders ($0.185 per common share)					(8,923)		(8,923)
Dividends distributed to noncontrolling interest						(1,710)	(1,710)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest					(466)		(466)
Foreign currency translation adjustments				546		(74)	472
Derivatives valuation, net of tax				1,877			1,877
Vesting of restricted stock units, share	154,000
Vesting of restricted stock units, value	$ 2	2,404	(4,425)				(2,019)
Exercise of stock options, share	29,000
Exercise of stock options, value		458	(82)				376
Excess tax benefit from equity-based awards			445				445
Equity-based compensation expense			4,515			69	4,584
Purchases of common stock, share	(1,344,000)
Purchases of common stock, value	$ (13)	(36,098)					(36,111)
Other, net of tax.				400		10	$ 410
Preferred stock ending balance, share at Jun. 30, 2016							0
Common stock ending balance, share at Jun. 30, 2016	47,320,000						47,319,652
Ending balance,value at Jun. 30, 2016	$ 474	$ (566,980)	$ 347,704	$ (98,542)	$ 734,441	$ 7,102	$ 424,199