Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,914	$ 6,412	$ 17,914	$ 18,912
Interest cost	6,578	6,528	20,005	19,638
Expected return on plan assets	(10,950)	(9,835)	(32,851)	(29,314)
Amortization of prior service cost	75	75	225	225
Net loss recognition	997	1,592	3,084	5,103
Net periodic benefit cost	2,614	4,772	8,377	14,564
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,095	1,062	3,255	2,967
Interest cost	1,343	1,305	4,167	3,990
Expected return on plan assets	(700)	(509)	(2,100)	(1,967)
Amortization of prior service cost	(275)	(275)	(825)	(825)
Net loss recognition	826	777	2,586	3,196
Net periodic benefit cost	$ 2,289	$ 2,360	$ 7,083	$ 7,361