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Employee Postretirement Benefits - 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 Plan Disclosure [Line Items]        
Net Periodic Benefit Cost $ 1,476 $ 2,840 $ 4,435 $ 8,524
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1,644 1,866 4,932 5,597
Interest Cost 3,086 2,915 9,258 8,745
Expected Return on Assets (5,921) (5,590) (17,763) (16,769)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 1,966 2,728 5,899 8,185
Net Periodic Benefit Cost 775 1,919 2,326 5,758
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 48 47 146 140
Interest Cost 335 307 1,006 921
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 141 154 425 465
Net Periodic Benefit Cost 524 508 1,577 1,526
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 335 430 1,004 1,291
Interest Cost 510 472 1,531 1,418
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (1,433) (1,432) (4,300) (4,299)
Amortization of Net Actuarial Loss 765 943 2,297 2,830
Net Periodic Benefit Cost $ 177 $ 413 $ 532 $ 1,240