Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,894	$ 5,771
Interest cost	7,232	6,907
Expected return on plan assets	(10,922)	(10,951)
Amortization of prior service cost	123	75
Net loss recognition	839	1,148
Net periodic benefit cost	2,166	2,950
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	818	1,063
Interest cost	1,044	1,440
Expected return on plan assets	(891)	(700)
Amortization of prior service cost	(263)	(275)
Net loss recognition	533	890
Net periodic benefit cost	$ 1,241	$ 2,418