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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 980 $ 1,194 $ 3,046 $ 3,780
Interest cost 2,996 2,525 9,112 7,595
Expected return on plan assets (4,776) (4,627) (14,480) (13,891)
Amortization of prior service cost 5 54 118 275
Recognized actuarial loss 2,133 2,832 6,724 8,401
Settlement loss 0 3,375 0 3,375
Net periodic benefit cost (credit) 1,338 5,353 4,520 9,535
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 22 19 66 59
Amortization of prior service cost (509) (509) (1,527) (1,528)
Recognized actuarial loss (25) (2) (75) (7)
Net periodic benefit cost (credit) $ (512) $ (492) $ (1,536) $ (1,476)