Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Value at Dec. 31, 2012	$ 362,155	$ 3,709	$ (76)	$ 164,346	$ 201,094	$ (6,918)
Beginning Balance, Issued Shares at Dec. 31, 2012	37,131,777	37,131,777
Beginning Balance, Treasury Shares at Dec. 31, 2012			(40,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	30,886				30,886
Cumulative translation adjustment	(4,096)					(4,096)
Repurchase and retirement of common stock, Shares		250,900
Repurchase and retirement of common stock, Value	2,492	25		2,467
Vesting of restricted stock, Shares		47,173
Vesting of restricted stock, Value	0	5		(5)
Exercise of stock options, Shares		136,419
Exercise of stock options, Value	662	14		648
Share based compensation	996			996
Tax benefit related to share-based compensation	0			0
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Value	(728)
Dividends paid	(2,794)				(2,794)
Ending Balance, Value at Jun. 30, 2013	384,589	3,698	(76)	162,795	229,186	(11,014)
Ending Balance, Issued Shares at Jun. 30, 2013	37,016,509	37,016,509
Ending Balance, Treasury Shares at Jun. 30, 2013			(40,509)
Beginning Balance, Value at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,542
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(47,960)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Value	(728)	(5)		(723)
Ending Balance, Value at Jun. 30, 2013	$ 384,589	$ 3,698	$ (76)	$ 162,795
Ending Balance, Issued Shares at Jun. 30, 2013	37,016,509	37,016,509
Ending Balance, Treasury Shares at Jun. 30, 2013			(40,509)