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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (603) $ (1,651) $ (1,812) $ (4,952)
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 876 972 2,627 2,915
Interest Cost 4,325 4,297 12,977 12,891
Expected Return on Assets (6,191) (6,380) (18,573) (19,139)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 335 40 1,006 119
Net Periodic Benefit Cost (Income) (655) (1,071) (1,963) (3,214)
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 0 0 0
Interest Cost 474 474 1,421 1,422
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) 474 474 1,421 1,422
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 123 123 368 368
Interest Cost 403 399 1,208 1,199
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (948) (1,576) (2,846) (4,727)
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) $ (422) $ (1,054) $ (1,270) $ (3,160)