Comprehensive Income (Loss) - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Comprehensive Income (Loss)
Net earnings	$ 1,325	$ 1,162
Foreign currency translation adjustments	(143)	(2,558)
Pension liability, net of tax of $64 and $48, respectively	183	138
Total comprehensive income (loss)	$ 1,365	$ (1,258)