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							$ 24,447
Dividends distributed to noncontrolling interest							(1,710)
Foreign currency translation adjustments							$ 472
Ending balance, value at Jun. 30, 2016				(98,542)
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					33,939	2,022	35,961
Dividends to shareholders					(10,069)		(10,069)
Dividends distributed to noncontrolling interest						(1,800)	(1,800)
Foreign currency translation adjustments				9,335		232	9,567
Derivatives valuation, net of tax				12,663			12,663
Vesting of restricted stock units, share	130,000
Vesting of restricted stock units, value	$ 1	2,139	(4,016)				(1,876)
Exercise of stock options, share	60,000
Exercise of stock options, value	$ 1	993	1,156				2,150
Equity-based compensation expense			5,127			(291)	4,836
Purchases of common stock, share	(610,000)
Purchases of common stock, value	$ (6)	(18,322)					(18,328)
Other, net of tax				259			$ 259
Preferred stock ending balance, share at Jun. 30, 2017							0
Common stock ending balance, share at Jun. 30, 2017	45,694,000						45,694,081
Ending balance, value at Jun. 30, 2017	$ 458	$ (618,452)	$ 351,006	$ (104,707)	$ 759,809	$ 7,144	$ 395,258