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	28,996				28,996
Cumulative translation adjustment	2,599					2,599
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		35,850
Vesting of restricted stock, Value	0	3		(3)
Exercise of stock options, Shares		450,000
Exercise of stock options, Value	788	45		743
Share based compensation	882			882
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(1,850)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(30)	0		(30)
Dividends paid	(5,793)				(5,793)
Ending Balance, Value at Jun. 30, 2014	$ 438,433	$ 3,839	$ (76)	$ 163,588	$ 280,777	$ (9,695)
Ending Balance, Issued Shares at Jun. 30, 2014	38,435,320	38,435,320
Ending Balance, Treasury Shares at Jun. 30, 2014			(40,509)