Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Balance at Dec. 31, 2012	$ 789,568	$ 483	$ 184,677	$ 592,309	$ 12,099
Balance (in shares) at Dec. 31, 2012		48,422,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,971			50,971
Translation adjustment, net of tax	5,941				5,941
Pension adjustment net of tax	46				46
Options exercised	15,057	$ 5	15,052
Options exercised (in shares)		512,000
Stock-based compensation expense	12,090		12,090
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(2,645)		(2,645)
Repurchase of common stock	(9,825)					$ (9,825)
Repurchase of common stock (in shares)		(342,000)
Retirement of common stock		$ (4)		(9,821)		9,825
Cash dividends declared on common stock, $0.62, $0.545 and $0.375 per share for the year ended December 31, 2015, 2014 and 2013, respectively	(18,170)			(18,170)
Shares issued from release of restricted stock units	(2,072)	$ 2	(2,074)
Shares issued from release of restricted stock units (in shares)		111,000
Common stock issued at $34.32, $35.87 and $33.81 for the years ended December 31, 2015, 2014 and 2013 During Period, Value, Share-based Compensation, Net of Forfeitures	318		318
Common stock issued		9,000
Balance at Dec. 31, 2013	841,279	$ 486	207,418	615,289	18,086
Balance (in shares) at Dec. 31, 2013		48,712,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,531			63,531
Translation adjustment, net of tax	(24,896)				(24,896)
Pension adjustment net of tax	(370)				(370)
Options exercised	4,582	$ 2	4,580
Options exercised (in shares)		161,000
Stock-based compensation expense	12,354		12,354
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(268)		(268)
Repurchase of common stock	(2,981)					(2,981)
Repurchase of common stock (in shares)		(95,000)
Retirement of common stock		$ (1)		(2,980)		2,981
Cash dividends declared on common stock, $0.62, $0.545 and $0.375 per share for the year ended December 31, 2015, 2014 and 2013, respectively	(26,666)			(26,666)
Shares issued from release of restricted stock units	(3,502)	$ 2	(3,504)
Shares issued from release of restricted stock units (in shares)		177,000
Common stock issued at $34.32, $35.87 and $33.81 for the years ended December 31, 2015, 2014 and 2013 During Period, Value, Share-based Compensation, Net of Forfeitures	402		402
Common stock issued		11,000
Balance at Dec. 31, 2014	$ 863,465	$ 489	220,982	649,174	(7,180)
Balance (in shares) at Dec. 31, 2014	48,966,000	48,966,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 67,888			67,888
Translation adjustment, net of tax	(20,939)				(20,939)
Pension adjustment net of tax	(457)				(457)
Options exercised	9,720	$ 3	9,717
Options exercised (in shares)		331,000
Stock-based compensation expense	10,997		10,997
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(318)		(318)
Repurchase of common stock	$ (47,144)					(47,144)
Repurchase of common stock (in shares)	(1,338,894)	(1,339,000)
Retirement of common stock		$ (13)		(47,131)		$ 47,144
Cash dividends declared on common stock, $0.62, $0.545 and $0.375 per share for the year ended December 31, 2015, 2014 and 2013, respectively	$ (30,224)			(30,224)
Shares issued from release of restricted stock units	(3,716)	$ 2	(3,718)
Shares issued from release of restricted stock units (in shares)		210,000
Common stock issued at $34.32, $35.87 and $33.81 for the years ended December 31, 2015, 2014 and 2013 During Period, Value, Share-based Compensation, Net of Forfeitures	552		552
Common stock issued		16,000
Balance at Dec. 31, 2015	$ 849,824	$ 481	$ 238,212	$ 639,707	$ (28,576)
Balance (in shares) at Dec. 31, 2015	48,184,000	48,184,000