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	47,011				47,011
Cumulative translation adjustment	(1,947)					(1,947)
Repurchase and retirement of common stock, Shares		(1,178,662)
Repurchase and retirement of common stock, Value	(17,365)	(118)		(17,247)
Vesting of restricted stock, Shares		44,117
Vesting of restricted stock, Value	0	4		(4)
Exercise of stock options, Shares		450,000
Exercise of stock options, Value	788	45		743
Share based compensation	1,333			1,333
Shares reaquired in connection with put option, Shares		(209,656)
Shares reaquired in connection with put option, Value	(2,986)	(21)		(2,965)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(2,302)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(37)	0		(37)
Reclassification of shares previously reported as temporary equity in connection with an acquisition, Value	5,000			5,000
Dividends paid	(8,652)				(8,652)
Ending Balance, Value at Sep. 30, 2014	$ 436,370	$ 3,715	$ (76)	$ 151,039	$ 295,933	$ (14,241)
Ending Balance, Issued Shares at Sep. 30, 2014	37,191,888	37,191,888
Ending Balance, Treasury Shares at Sep. 30, 2014			(40,509)