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Employee Postretirement Benefits - Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits (Pension Plan)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost $ 0 $ 0
Unrecognized Actuarial Loss 85,367 102,737
Net Regulatory Assets (Liabilities) 85,367 102,737
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial (Gain) Loss (1,978) (1,020)
Total Accumulated Other Comprehensive Income (Loss) (1,978) (1,020)
Pension Benefits (ESSRP)    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Loss 979 2,525
Net Regulatory Assets (Liabilities) 979 2,525
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial (Gain) Loss 1,093 10,660
Total Accumulated Other Comprehensive Income (Loss) 1,093 10,660
Postretirement Benefits    
Regulatory Assets (Liabilities):    
Unrecognized Prior Service Cost (8,400) (13,989)
Unrecognized Actuarial Loss 3,993 26,852
Net Regulatory Assets (Liabilities) (4,407) 12,863
Accumulated Other Comprehensive Income (Loss):    
Unrecognized Prior Service Cost (99) (242)
Unrecognized Actuarial (Gain) Loss (818) (160)
Total Accumulated Other Comprehensive Income (Loss) $ (917) $ (402)