Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	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]	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, 2012	0
Common stock beginning balance, share at Dec. 31, 2012		52,288
Beginning balance,value at Dec. 31, 2012	$ 0	$ 522	$ (428,716)	$ 350,714	$ 22,981	$ 540,791	$ 12,978	$ 499,270
Net income excluding mandatorily redeemable noncontrolling interest	0					67,388	3,601	70,989
Dividends distributed to noncontrolling interest	0						(4,183)	(4,183)
Purchases of outstanding noncontrolling interest	0			3,715			(4,140)	(425)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest	0					(1,677)		(1,677)
Deconsolidation of a subsidiary	0						(121)	(121)
Foreign currency translation adjustments	0				(26,254)		(88)	(26,342)
Derivatives valuation, net of tax	$ 0				(17,911)			(17,911)
Vesting of restricted stock units, share	0	455
Vesting of restricted stock units, value	$ 0	$ 5	6,530	(11,509)				(4,974)
Exercise of stock options, share	0	91
Exercise of stock options, value	$ 0	$ 1	1,294	(433)				862
Excess tax benefit from equity-based awards	0			787				787
Equity-based compensation expense	$ 0			13,107			34	13,141
Purchases of common stock, share	0	(2,481)
Purchases of common stock, value	$ 0	$ (25)	(56,507)					(56,532)
Other, net of tax	$ 0				598			598
Preferred stock ending balance, share at Dec. 31, 2013	0
Common stock ending balance, share at Dec. 31, 2013		50,353
Ending balance,value at Dec. 31, 2013	$ 0	$ 503	(477,399)	356,381	(20,586)	606,502	8,081	473,482
Net income excluding mandatorily redeemable noncontrolling interest	0					72,293	4,512	76,805
Dividends distributed to noncontrolling interest	0						(4,275)	(4,275)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest	0					(936)		(936)
Foreign currency translation adjustments	0				(22,771)		(349)	(23,120)
Derivatives valuation, net of tax	$ 0				(9,993)			(9,993)
Vesting of restricted stock units, share	0	396
Vesting of restricted stock units, value	$ 0	$ 4	5,979	(11,362)				(5,379)
Exercise of stock options, share	0	58
Exercise of stock options, value	$ 0	$ 1	876	(434)				443
Excess tax benefit from equity-based awards	0			1,015				1,015
Equity-based compensation expense	$ 0			11,192			14	11,206
Purchases of common stock, share	0	(2,354)
Purchases of common stock, value	$ 0	$ (23)	(57,051)					(57,074)
Other, net of tax	$ 0				1,076			$ 1,076
Preferred stock ending balance, share at Dec. 31, 2014	0							0
Common stock ending balance, share at Dec. 31, 2014		48,453						48,452,852
Ending balance,value at Dec. 31, 2014	$ 0	$ 485	(527,595)	356,792	(52,274)	677,859	7,983	$ 463,250
Net income excluding mandatorily redeemable noncontrolling interest	0					61,666	3,382	65,048
Dividends to shareholders ($0.18 per common share)	0					(17,423)		(17,423)
Dividends distributed to noncontrolling interest	0						(3,960)	(3,960)
Adjustments to redemption value of mandatorily redeemable noncontrolling interest	0					(1,113)		(1,113)
Foreign currency translation adjustments	0				(37,844)		(356)	(38,200)
Derivatives valuation, net of tax	0				(8,540)			(8,540)
Vesting of restricted stock units, share		372
Vesting of restricted stock units, value	0	$ 4	5,768	(10,016)				$ (4,244)
Exercise of stock options, share		342						(894,168)
Exercise of stock options, value	0	$ 3	5,307	(9,737)				$ (4,427)
Excess tax benefit from equity-based awards	0			(823)				(823)
Equity-based compensation expense	0			11,035			152	$ 11,187
Purchases of common stock, share		(686)						686,000,000
Purchases of common stock, value	0	$ (7)	(17,224)					$ (17,231)
Other, net of tax	$ 0				(2,707)			$ (2,707)
Preferred stock ending balance, share at Dec. 31, 2015	0							0
Common stock ending balance, share at Dec. 31, 2015		48,481						48,481,323
Ending balance,value at Dec. 31, 2015	$ 0	$ 485	$ (533,744)	$ 347,251	$ (101,365)	$ 720,989	$ 7,201	$ 440,817