CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 81,647	$ 64,143	$ 214,143	$ 170,100
Other comprehensive income, before tax:
(Loss)/gain on foreign currency translation adjustments	(339)	2,675	(2,701)	241
Pension and postretirement benefits obligation	4,406	3,287	13,217	9,890
Net unrealized gain on available-for-sale securities	535	5,556	1,715	4,889
Other comprehensive income, before tax	4,602	11,518	12,231	15,020
Income tax expense	1,209	3,017	3,213	3,969
Other comprehensive income, net of tax	3,393	8,501	9,018	11,051
Comprehensive income attributable to common stockholders	$ 85,040	$ 72,644	$ 223,161	$ 181,151