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Pension Plans and Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,000 $ 3,200 $ 3,900 $ 6,200
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,879 2,988 3,758 5,905
Interest cost 11,949 7,858 23,859 15,679
Expected return on plan assets (15,109) (20,888) (30,219) (41,756)
Amortization of prior service cost 820 807 1,640 1,614
Net periodic benefit income (461) (9,235) (962) (18,558)
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 84 166 169 331
Interest cost 534 347 1,069 694
Expected return on plan assets (635) (737) (1,269) (1,475)
Amortization of prior service cost 10 6 20 13
Net periodic benefit income $ (7) $ (218) $ (11) $ (437)