Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Stockholders' Equity of the Company Preferred Stock [Member]	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]	Stockholders' Equity of the Company Accumulated Other Comprehensive Income (Loss) [Member]	Stockholders' Equity of the Company Retained Earnings [Member]	Noncontrolling Interest [Member]
Preferred stock beginning balance, share at Dec. 31, 2014	0	0
Common stock beginning balance, share at Dec. 31, 2014	48,452,852		48,453
Beginning balance,value at Dec. 31, 2014	$ 463,250	$ 0	$ 485	$ (527,595)	$ 356,792	$ (52,274)	$ 677,859	$ 7,983
Net income	35,528						33,468
Net income excluding mandatorily redeemable noncontrolling interest	35,203							1,735
Dividends to shareholders	(8,710)						(8,710)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest	(903)						(903)
Dividends distributed to noncontrolling interest	(2,025)							(2,025)
Foreign currency translation adjustments	(17,345)					(17,147)		(198)
Derivatives valuation, net of tax	(2,969)					(2,969)
Vesting of restricted stock units, share			251
Vesting of restricted stock units, value	(2,242)		$ 3	3,882	(6,127)
Exercise of stock options, share			29
Exercise of stock options, value	432			455	(23)
Excess tax benefit from equity-based awards	274				274
Equity-based compensation expense	5,221				5,131			90
Purchases of common stock, share			(501)
Purchases of common stock, value	(12,254)		$ (5)	(12,249)
Other, net of tax	$ (2,361)					(2,361)
Preferred stock ending balance, share at Jun. 30, 2015	0	0
Common stock ending balance, share at Jun. 30, 2015	48,232,405		48,232
Ending balance,value at Jun. 30, 2015	$ 455,571	$ 0	$ 483	$ (535,507)	$ 356,047	$ (74,751)	$ 701,714	$ 7,585