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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 848 $ 980 $ 2,548 $ 3,046
Interest cost 5,234 2,996 15,670 9,112
Expected return on plan assets (5,103) (4,776) (15,280) (14,480)
Amortization of prior service cost and credit 37 5 112 118
Recognized actuarial gain (loss) 1,467 2,133 4,399 6,724
Net periodic benefit cost (credit) 2,483 1,338 7,449 4,520
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 45 22 134 66
Amortization of prior service cost and credit (509) (509) (1,528) (1,527)
Recognized actuarial gain (loss) (57) (25) (170) (75)
Net periodic benefit cost (credit) $ (521) $ (512) $ (1,564) $ (1,536)