Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net earnings	$ 5,377	$ 5,545	$ 11,054	$ 11,296
Foreign currency translation adjustments	(1,609)	(1,426)	(3,109)	(796)
Pension liability, net of tax of $174, $69, $520, and $207, respectively	272	107	815	323
Total comprehensive income	$ 4,040	$ 4,226	$ 8,760	$ 10,823