Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock	Non - Controlling Interest
Beginning balance at Dec. 31, 2013	$ 366,174	$ 33	$ 214,522	$ 236,979	$ (60,718)	$ (24,642)	$ 0
Beginning balance (in shares) at Dec. 31, 2013		33,342,312				(1,170,129)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued on exercise/vesting of equity awards	6,460	$ 1	6,459
Stock issued on exercise/vesting of equity awards (in shares)		861,040
Stock based compensation	11,011		11,011
Excess tax benefit from stock based compensation	1,181		1,181
Acquisition of treasury stock	(3,322)					$ (3,322)
Acquisition of treasury stock (in shares)						(127,756)
Non-controlling interest	0						0
Other comprehensive income	5,209				5,209
Net income	32,445			32,445
Ending balance at Dec. 31, 2014	419,158	$ 34	233,173	269,424	(55,509)	$ (27,964)	0
Ending balance (shares) at Dec. 31, 2014		34,203,352				(1,297,885)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued on exercise/vesting of equity awards	3,375	$ 1	3,374
Stock issued on exercise/vesting of equity awards (in shares)		577,849
Stock based compensation	16,047		16,047
Excess tax benefit from stock based compensation	1,458		1,458
Acquisition of treasury stock	(14,195)					$ (14,195)
Acquisition of treasury stock (in shares)						(392,093)
Non-controlling interest	179						179
Other comprehensive income	(11,816)				(11,816)
Net income	51,565			51,565
Ending balance at Dec. 31, 2015	$ 465,771	$ 35	254,052	320,989	(67,325)	$ (42,159)	179
Ending balance (shares) at Dec. 31, 2015	33,091,223	34,781,201				(1,689,978)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued on exercise/vesting of equity awards	$ 6,499	$ 1	6,498
Stock issued on exercise/vesting of equity awards (in shares)		918,618
Stock based compensation	19,770		19,770
Excess tax benefit from stock based compensation	4,326		4,326
Acquisition of treasury stock	(18,203)					$ (18,203)
Acquisition of treasury stock (in shares)						(381,732)
Non-controlling interest	14						14
Other comprehensive income	(7,732)				(7,732)
Net income	61,733			61,733
Ending balance at Dec. 31, 2016	$ 532,178	$ 36	$ 284,646	$ 382,722	$ (75,057)	$ (60,362)	$ 193
Ending balance (shares) at Dec. 31, 2016	33,628,109	35,699,819				(2,071,710)