Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 8,394	$ 7,406
Foreign currency translation adjustments	(13,193)	(13,903)
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $(1,301) and $401, respectively	3,261	(1,317)
Unrecognized retirement obligations, net of taxes of $(73) and $51, respectively	92	(101)
Other comprehensive loss	(9,840)	(15,321)
Comprehensive loss	$ (1,446)	$ (7,915)