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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (1,568) $ 1,476 $ (4,700) $ 4,435
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 925 1,644 2,774 4,932
Interest Cost 4,109 3,086 12,327 9,258
Expected Return on Assets (6,479) (5,921) (19,436) (17,763)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 1,966 0 5,899
Net Periodic Benefit Cost (Income) (1,445) 775 (4,335) 2,326
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 18 48 54 146
Interest Cost 472 335 1,417 1,006
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 141 0 425
Net Periodic Benefit Cost (Income) 490 524 1,471 1,577
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 152 335 458 1,004
Interest Cost 668 510 2,006 1,531
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (1,433) (1,433) (4,300) (4,300)
Amortization of Net Actuarial Loss 0 765 0 2,297
Net Periodic Benefit Cost (Income) $ (613) $ 177 $ (1,836) $ 532