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, 2015				$ (101,365)
Net income							$ 37,096
Dividends distributed to noncontrolling interest							(2,745)
Foreign currency translation adjustments							$ (8,069)
Ending balance, value at Sep. 30, 2016				(109,832)
Preferred stock beginning balance, share at Dec. 31, 2016							0
Common stock beginning balance, share at Dec. 31, 2016	46,114,000						46,113,693
Beginning balance, value at Dec. 31, 2016	$ 462	$ (603,262)	$ 348,739	(126,964)	$ 735,939	$ 6,981	$ 361,895
Net income					48,708	2,828	51,536
Dividends to shareholders					(21,531)		(21,531)
Dividends distributed to noncontrolling interest						(2,745)	(2,745)
Foreign currency translation adjustments				8,089		325	8,414
Derivatives valuation, net of tax				14,596			14,596
Vesting of restricted stock units, share	283,000
Vesting of restricted stock units, value	$ 2	4,673	(9,612)				(4,937)
Exercise of stock options, share	60,000
Exercise of stock options, value		994	1,156				2,150
Equity-based compensation expense			8,649			(291)	8,358
Purchases of common stock, share	(610,000)
Purchases of common stock, value	$ (6)	(18,322)					(18,328)
Other, net of tax				386			$ 386
Preferred stock ending balance, share at Sep. 30, 2017							0
Common stock ending balance, share at Sep. 30, 2017	45,847,000						45,847,389
Ending balance, value at Sep. 30, 2017	$ 458	$ (615,917)	$ 348,932	$ (103,893)	$ 763,116	$ 7,098	$ 399,794