Stockholders' Equity (Details) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 02, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 151,725,000
Net income	$ 3,716,000	$ 7,244,000	12,537,000	$ 19,674,000
Foreign currency translation adjustment			(3,794,000)
Repurchases of common stock			(6,594,000)
Stock-based compensation expense	781,000	$ 491,000	2,212,000	$ 1,498,000
Issuance of stock for employer contributions to retirement plan			2,040,000
Other			111,000
Ending Balance	$ 158,237,000		$ 158,237,000
Long-term Debt, Gross					$ 40,000,000
Stock Repurchased During Period, Shares	222		255
Stock Repurchased During Period, Value	$ 5,500,000		$ 6,600,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	8,400,000		8,400,000
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			2,212,000
Issuance of stock for employer contributions to retirement plan			681,000
Other			(502,000)
Ending Balance	106,914,000		106,914,000
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			54,809,000
Net income			12,537,000
Ending Balance	67,346,000		67,346,000
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(381,000)
Repurchases of common stock			(6,594,000)
Issuance of stock for employer contributions to retirement plan			1,359,000
Other			612,000
Ending Balance	(5,004,000)		(5,004,000)
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(7,397,000)
Foreign currency translation adjustment			(3,794,000)
Ending Balance	$ (11,191,000)		$ (11,191,000)