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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 7,569 $ 9,359 $ 9,730
Interest cost 14,234 10,708 9,415
Expected return on assets (15,440) (18,841) (18,019)
Amortization of prior service cost 15 17 41
Amortization of actuarial loss (gain) 2,210 4,620 6,901
Recognition of significant event 0 (1,595) 0
Net periodic benefit cost 8,588 4,268 8,068
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 638 1,032 1,115
Interest cost 1,268 883 806
Expected return on assets (860) (1,047) (970)
Amortization of prior service cost 0 0 0
Amortization of actuarial loss (gain) (350) (115) 257
Recognition of significant event 0 0 0
Net periodic benefit cost $ 696 $ 753 $ 1,208