CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 65,540	$ 46,574	$ 105,957	$ 68,895
Other comprehensive income, before tax:
(Loss)/gain on foreign currency translation adjustments	(588)	286	(2,434)	1,134
Pension and postretirement benefits obligation	3,315	1,553	6,603	3,106
Net unrealized gain/(loss) on available-for-sale securities	42	1,496	(667)	4,098
Other comprehensive income, before tax	2,769	3,335	3,502	8,338
Income tax expense	722	879	952	2,173
Other comprehensive income, net of tax	2,047	2,456	2,550	6,165
Comprehensive income attributable to common stockholders	$ 67,587	$ 49,030	$ 108,507	$ 75,060