Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 67,090	$ 47,693	$ (83,083)	$ 83,235
Other comprehensive gains (losses), net of tax:
Foreign currency translation adjustments (Note 6)	5,039	(31,606)	16,233	(25,714)
Pension and post-retirement plan actuarial gains, net of tax (Note 6)	115	2,330	554	4,594
Unrealized (loss) gain on available-for-sale securities (Note 6)	0	(9)	2	(18)
Total other comprehensive income (loss), net of tax	5,154	(29,285)	16,789	(21,138)
Comprehensive income (loss)	$ 72,244	$ 18,408	$ (66,294)	$ 62,097