Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2015 - 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
Preferred stock beginning balance, share at Dec. 31, 2014							0
Common stock beginning balance, share at Dec. 31, 2014	48,453,000						48,452,852
Beginning balance,value at Dec. 31, 2014	$ 485	$ (527,595)	$ 356,792	$ (52,274)	$ 677,859	$ 7,983	$ 463,250
Net income					44,663		47,966
Net income excluding mandatorily redeemable noncontrolling interest						2,766	47,429
Dividends to shareholders					(17,423)		(17,423)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest					(1,201)		(1,201)
Dividends distributed to noncontrolling interest						(2,925)	(2,925)
Foreign currency translation adjustments				(39,019)		(323)	(39,342)
Derivatives valuation, net of tax				(9,469)			(9,469)
Vesting of restricted stock units, share	330,000
Vesting of restricted stock units, value	$ 3	5,098	(8,394)				(3,293)
Exercise of stock options, share	284,000
Exercise of stock options, value	$ 3	4,413	(9,668)				(5,252)
Excess tax benefit from equity-based awards			354				354
Equity-based compensation expense			8,361			122	8,483
Purchases of common stock, share	(663,000)
Purchases of common stock, value	$ (6)	(16,596)					(16,602)
Other, net of tax				(2,140)			$ (2,140)
Preferred stock ending balance, share at Sep. 30, 2015							0
Common stock ending balance, share at Sep. 30, 2015	48,404,000						48,404,250
Ending balance,value at Sep. 30, 2015	$ 485	$ (534,680)	$ 347,445	$ (102,902)	$ 703,898	$ 7,623	$ 421,869