Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 65,256	$ 44,906	$ (17,827)	$ 128,141
Other comprehensive gains (losses), net of tax:
Foreign currency translation adjustments (Note 6)	(18,771)	(32,361)	(2,538)	(58,075)
Pension and post-retirement plan actuarial gains, net of tax (Note 6)	188	2,299	742	6,893
Unrealized gain (loss) on available-for-sale securities (Note 6)	0	13	2	(5)
Total other comprehensive loss, net of tax	(18,482)	(27,137)	(1,693)	(48,275)
Comprehensive income (loss)	$ 46,774	$ 17,769	$ (19,520)	$ 79,866