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							$ 47,966
Dividends distributed to noncontrolling interest							(2,925)
Foreign currency translation adjustments							$ (39,342)
Ending balance,value at Sep. 30, 2015				(102,902)
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					34,292	2,804	37,096
Dividends to shareholders ($0.385 per common share)					(18,264)		(18,264)
Dividends distributed to noncontrolling interest						(2,745)	(2,745)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest					(466)		(466)
Foreign currency translation adjustments				(7,999)		(70)	(8,069)
Derivatives valuation, net of tax				(1,670)			(1,670)
Vesting of restricted stock units, share	285,000
Vesting of restricted stock units, value	$ 3	4,488	(8,183)				(3,692)
Exercise of stock options, share	29,000
Exercise of stock options, value		458	(82)				376
Excess tax benefit from equity-based awards			499				499
Equity-based compensation expense			7,152			96	7,248
Purchases of common stock, share	(2,087,000)
Purchases of common stock, value	$ (20)	(57,259)					(57,279)
Other, net of tax.				1,202		10	$ 1,212
Preferred stock ending balance, share at Sep. 30, 2016							0
Common stock ending balance, share at Sep. 30, 2016	46,708,000						46,708,311
Ending balance,value at Sep. 30, 2016	$ 468	$ (586,057)	$ 346,637	$ (109,832)	$ 736,551	$ 7,296	$ 395,063