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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Net Periodic Benefit Cost (Income) $ (603) $ (1,650)
Pension Benefits (Pension Plan)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 876 972
Interest Cost 4,326 4,297
Expected Return on Assets (6,191) (6,380)
Amortization of Prior Service Cost 0 0
Amortization of Net Actuarial Loss 335 40
Net Periodic Benefit Cost (Income) (654) (1,071)
Pension Benefits (ESSRP)    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0 0
Interest Cost 474 474
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) 474 474
Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 123 123
Interest Cost 403 400
Expected Return on Assets 0 0
Amortization of Prior Service Cost (949) (1,576)
Amortization of Net Actuarial Loss 0 0
Net Periodic Benefit Cost (Income) $ (423) $ (1,053)