Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 60,884	$ 49,343	$ 47,177
Other comprehensive income :
Foreign currency translation adjustment	(1,516)	1,096	(58)
Pension and postretirement benefits, net of tax	339	(208)	(97)
Comprehensive income	$ 59,707	$ 50,231	$ 47,022