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	$ 64,143	$ 53,615	$ 170,100	$ 122,510
Other comprehensive income, before tax:
Gain/(loss) on foreign currency translation adjustments	2,675	(2,333)	241	(1,199)
Pension and postretirement benefits obligation	3,287	1,550	9,890	4,656
Net unrealized gain on available-for-sale securities	5,556	1,886	4,889	5,984
Other comprehensive income, before tax	11,518	1,103	15,020	9,441
Income tax expense	3,017	290	3,969	2,463
Other comprehensive income, net of tax	8,501	813	11,051	6,978
Comprehensive income attributable to common stockholders	$ 72,644	$ 54,428	$ 181,151	$ 129,488