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Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,892 $ 2,397 $ 3,784 $ 4,794
Interest cost 3,557 2,642 7,115 5,283
Expected return on assets (4,069) (4,824) (8,138) (9,646)
Unrecognized actuarial loss 554 1,275 1,108 2,515
Amortization of prior service cost 4 4 7 8
Total 1,938 1,494 3,876 2,954
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 160 255 320 510
Interest cost 317 219 634 438
Expected return on assets (217) (221) (434) (442)
Unrecognized actuarial loss (88) (75) (176) (151)
Amortization of prior service cost 0 0 0 0
Total $ 172 $ 178 $ 344 $ 355