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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (1,651) $ (1,568) $ (4,952) $ (4,700)
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 972 925 2,915 2,774
Interest Cost 4,297 4,109 12,891 12,327
Expected Return on Assets (6,380) (6,479) (19,139) (19,436)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 40 0 119 0
Net Periodic Benefit Cost (Income) (1,071) (1,445) (3,214) (4,335)
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 18 0 54
Interest Cost 474 472 1,422 1,417
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) 474 490 1,422 1,471
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 123 152 368 458
Interest Cost 399 668 1,199 2,006
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (1,576) (1,433) (4,727) (4,300)
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) $ (1,054) $ (613) $ (3,160) $ (1,836)