Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 66,648	$ 65,256	$ 197,021	$ (17,827)
Other comprehensive gain (loss), net of tax:
Foreign currency translation adjustments (Note 6)	21,329	(18,771)	1,834	(2,538)
Pension and post-retirement plan adjustments, net of tax (Note 6)	14	188	2,410	742
Unrealized gain on available-for-sale securities (Note 6)	0	0	0	2
Reclassification of currency translation from accumulated other comprehensive loss into net income (Note 6)	0	101	(1,200)	101
Total other comprehensive gain (loss), net of tax	21,343	(18,482)	3,044	(1,693)
Comprehensive income (loss)	$ 87,991	$ 46,774	$ 200,065	$ (19,520)