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Employee Postretirement Benefits - Summary of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits (Pension Plan)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost $ 0 $ 0
Unrecognized Actuarial Loss 85,227 85,367
Net Regulatory Assets (Liabilities) 85,227 85,367
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Gain (Loss) 1,994 1,978
Total Accumulated Other Comprehensive Income (Loss) 1,994 1,978
Pension Benefits (ESSRP)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Loss 1,061 979
Net Regulatory Assets (Liabilities) 1,061 979
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Gain (Loss) (1,403) (1,093)
Total Accumulated Other Comprehensive Income (Loss) (1,403) (1,093)
Postretirement Benefits    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost (18,845) (8,400)
Unrecognized Actuarial Loss 1,759 3,993
Net Regulatory Assets (Liabilities) (17,086) (4,407)
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 498 99
Unrecognized Actuarial Gain (Loss) 707 818
Total Accumulated Other Comprehensive Income (Loss) $ 1,205 $ 917