Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (USD $)	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance, Value at Dec. 31, 2014	$ 432,221,000	$ 3,619,000	$ (76,000)	$ 137,101,000	$ 309,726,000	$ (18,149,000)
Beginning Balance, Issued Shares at Dec. 31, 2014	36,232,074	36,232,074
Beginning Balance, Treasury Shares at Dec. 31, 2014			(40,509)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	31,000			31,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	18,336,000				18,336,000
Cumulative translation adjustment	(5,400,000)					(5,400,000)
Repurchase and retirement of common stock, Shares		(994,869)
Repurchase and retirement of common stock, Value	(24,223,000)	(100,000)		(24,123,000)
Vesting of restricted stock, Shares		55,802
Vesting of restricted stock, Value	0	6,000		(6,000)
Exercise of stock options, Shares		56,250
Exercise of stock options, Value	1,117,000	6,000		1,111,000
Share based compensation	458,000			458,000
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(37,335)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(1,117,000)	(4,000)		(1,113,000)
Treasury Stock, Shares, Retired		(40,509)	40,509
Treasury Stock, Retired, Cost Method, Amount	0		76,000	(76,000)
Dividends paid	(2,729,000)				(2,729,000)
Ending Balance, Value at Mar. 31, 2015	$ 418,694,000	$ 3,527,000	$ 0	$ 113,383,000	$ 325,333,000	$ (23,549,000)
Ending Balance, Issued Shares at Mar. 31, 2015	35,271,413	35,271,413
Ending Balance, Treasury Shares at Mar. 31, 2015			0