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Employee Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Benefit Cost (Income) $ (606) $ (1,651) $ (1,209) $ (3,301)
Pension Benefits (Pension Plan)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 875 971 1,751 1,943
Interest Cost 4,326 4,297 8,652 8,594
Expected Return on Assets (6,191) (6,379) (12,382) (12,759)
Amortization of Prior Service Cost 0 0 0 0
Amortization of Net Actuarial Loss 336 39 671 79
Net Periodic Benefit Cost (Income) (654) (1,072) (1,308) (2,143)
Pension Benefits (ESSRP)        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0 0 0 0
Interest Cost 473 474 947 948
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) 473 474 947 948
Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 122 122 245 245
Interest Cost 402 400 805 800
Expected Return on Assets 0 0 0 0
Amortization of Prior Service Cost (949) (1,575) (1,898) (3,151)
Amortization of Net Actuarial Loss 0 0 0 0
Net Periodic Benefit Cost (Income) $ (425) $ (1,053) $ (848) $ (2,106)