Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 96,104	$ 84,623	$ 79,671
Other comprehensive (loss)/ income, net of tax:
Net foreign currency translation adjustment	(11,255)	12,829	(891)
Unrealized gain/(loss) on cash flow hedge, net of taxes of $654, $809, and $372 at December 31, 2021, 2020, and 2019, respectively	2,053	(2,285)	(1,399)
Net change in postretirement benefit plan, net of taxes of $13, $127, and $101 at December 31, 2021, 2020 and 2019, respectively	36	(807)	328
Other comprehensive (loss)/ income, net of tax	(9,166)	9,737	(1,962)
Comprehensive income	$ 86,938	$ 94,360	$ 77,709