Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 7,527	$ 6,527	$ 17,331	$ 11,517
Foreign currency translation adjustments	(11,484)	17,836	(20,831)	9,824
Net change in:
Deferred gains (losses) on cash flow hedges, net of taxes of $(319), $1,049, $(1,506) and $1,745, respectively	396	(2,835)	3,341	(4,704)
Unrecognized retirement obligations, net of taxes of $(57), $53, $(144) and $156 respectively	376	270	618	70
Other comprehensive income (loss)	(10,712)	15,271	(16,872)	5,190
Comprehensive income (loss)	$ (3,185)	$ 21,798	$ 459	$ 16,707