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							$ 20,035
Dividends distributed to noncontrolling interest							(990)
Foreign currency translation adjustments							$ (11,283)
Ending balance,value at Mar. 31, 2015				(66,020)
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					11,225	680	11,905
Dividends to shareholders ($0.185 per common share)					(8,923)		(8,923)
Dividends distributed to noncontrolling interest						(900)	(900)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest					26		26
Foreign currency translation adjustments				9,896		60	9,956
Derivatives valuation, net of tax				5,479			5,479
Vesting of restricted stock units, share	82,000
Vesting of restricted stock units, value	$ 1	1,276	(2,525)				(1,248)
Exercise of stock options, share	1,000
Exercise of stock options, value		8	(2)				6
Excess tax benefit from equity-based awards			154				154
Equity-based compensation expense			2,759			31	2,790
Purchases of common stock, share	(332,000)
Purchases of common stock, value	$ (3)	(8,727)					(8,730)
Other, net of tax.				175		10	$ 185
Preferred stock ending balance, share at Mar. 31, 2016							0
Common stock ending balance, share at Mar. 31, 2016	48,232,000						48,231,632
Ending balance,value at Mar. 31, 2016	$ 483	$ (541,187)	$ 347,637	$ (85,815)	$ 723,317	$ 7,082	$ 451,517