Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data	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]
Beginning balance,value at Dec. 31, 2014	$ 463,250	$ 0	$ 485	$ (527,595)	$ 356,792	$ (52,274)	$ 677,859	$ 7,983
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
Net income	20,035						18,772
Net income excluding mandatorily redeemable noncontrolling interest	19,862							1,090
Dividends to shareholders	(8,710)						(8,710)	0
Adjustments to redemption value of mandatorily redeemable noncontrolling interest	(424)						(424)
Dividends distributed to noncontrolling interest	(990)							(990)
Foreign currency translation adjustments	(11,283)					(10,999)		(284)
Derivatives valuation, net of tax	(152)					(152)
Vesting of restricted stock units, share			159
Vesting of restricted stock units, value	(1,308)		2	2,456	(3,766)
Exercise of stock options, share			15
Exercise of stock options, value	234			233	1
Excess tax benefit from equity-based awards	111				111
Equity-based compensation expense	2,661				2,641			20
Purchases of common stock, share			(261)
Purchases of common stock, value	(5,915)		(3)	(5,912)
Other, net of tax	(2,595)					(2,595)
Ending balance,value at Mar. 31, 2015	$ 454,741	$ 0	$ 484	$ (530,818)	$ 355,779	$ (66,020)	$ 687,497	$ 7,819
Preferred stock ending balance, share at Mar. 31, 2015	0	0
Common stock ending balance, share at Mar. 31, 2015	48,366,272		48,366