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, 2013	$ 413,225	$ 3,805	$ (76)	$ 164,216	$ 257,574	$ (12,294)
Beginning Balance, Issued Shares at Dec. 31, 2013	38,088,391	38,088,391
Beginning Balance, Treasury Shares at Dec. 31, 2013			(40,509)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,417				15,417
Cumulative translation adjustment	1,128					1,128
Repurchase and retirement of common stock, Shares		(137,071)
Repurchase and retirement of common stock, Value	(2,234)	(14)		(2,220)
Vesting of restricted stock, Shares		24,764
Vesting of restricted stock, Value	0	2		(2)
Exercise of stock options, Shares		450,000
Exercise of stock options, Value	788	45		743
Share based compensation	395			395
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(1,488)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(25)	0		(25)
Dividends paid	(2,896)				(2,896)
Ending Balance, Value at Mar. 31, 2014	$ 425,798	$ 3,838	$ (76)	$ 163,107	$ 270,095	$ (11,166)
Ending Balance, Issued Shares at Mar. 31, 2014	38,424,596	38,424,596
Ending Balance, Treasury Shares at Mar. 31, 2014			(40,509)