CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,789	$ (3,977)	$ 8,856	$ (32,141)
Other comprehensive income (loss), net of taxes:
Translation adjustment	2,394	(2,514)	4,223	(6,972)
Net change in cash flow hedges	236	101	63	(2,776)
Effect of retirement benefit obligations	41	19	68	39
Other comprehensive income (loss), net of taxes	2,671	(2,394)	4,354	(9,709)
Comprehensive income (loss)	$ 8,460	$ (6,371)	$ 13,210	$ (41,850)