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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Net Periodic Benefit Cost (Income) $ (1,650) $ (1,724)
Pension Benefits (Pension Plan)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 972 925
Interest Cost 4,297 4,109
Expected Return on Assets (6,380) (6,479)
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 40 0
Net Periodic Benefit Cost (Income) (1,071) (1,445)
Pension Benefits (ESSRP)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0 18
Interest Cost 474 314
Expected Return on Assets 0 0
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 0 0
Net Periodic Benefit Cost (Income) 474 332
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 123 153
Interest Cost 400 669
Expected Return on Assets 0 0
Amortization of Prior Service Cost (1,576) (1,433)
Amortization of Net Actuarial Loss 0 0
Net Periodic Benefit Cost (Income) $ (1,053) $ (611)