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Employee Postretirement Benefits - Schedule of Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits (Pension Plan)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost $ 0 $ 0
Unrecognized Actuarial Loss 87,868 85,227
Net Regulatory Assets (Liabilities) 87,868 85,227
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Gain (Loss) 1,937 1,994
Total Accumulated Other Comprehensive Income (Loss) 1,937 1,994
Pension Benefits (ESSRP)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Loss 292 1,061
Net Regulatory Assets (Liabilities) 292 1,061
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Gain (Loss) (2,502) (1,403)
Total Accumulated Other Comprehensive Income (Loss) (2,502) (1,403)
Postretirement Benefits    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost (12,703) (18,845)
Unrecognized Actuarial Loss 1,121 1,759
Net Regulatory Assets (Liabilities) (11,582) (17,086)
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 339 498
Unrecognized Actuarial Gain (Loss) 732 707
Total Accumulated Other Comprehensive Income (Loss) $ 1,071 $ 1,205