Stockholders' Equity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 02, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 151,725,000
Net income	$ 4,714,000	$ 8,113,000	8,821,000	$ 12,430,000
Foreign currency translation adjustment			(1,098,000)
Repurchases of common stock			(1,101,000)
Stock-based compensation expense	818,000	$ 501,000	1,430,000	$ 1,007,000
Issuance of stock for employer contributions to retirement plan			1,349,000
Other			283,000
Ending Balance	161,409,000		161,409,000
Long-term Debt, Gross					$ 40,000,000
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			171,000
Other			1,000
Ending Balance	172,000		172,000
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			104,523,000
Stock-based compensation expense			1,430,000
Issuance of stock for employer contributions to retirement plan			511,000
Other			(178,000)
Ending Balance	106,286,000		106,286,000
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			54,809,000
Net income			8,821,000
Ending Balance	63,630,000		63,630,000
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(381,000)
Repurchases of common stock			(1,101,000)
Issuance of stock for employer contributions to retirement plan			838,000
Other			460,000
Ending Balance	(184,000)		(184,000)
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(7,397,000)
Foreign currency translation adjustment			(1,098,000)
Ending Balance	$ (8,495,000)		$ (8,495,000)