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Employee Postretirement Benefits - Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Pension Plan    
Regulatory Assets:    
Unrecognized Prior Service Cost $ 0 $ 0
Unrecognized Actuarial Loss 102,737 137,500
Total Regulatory Assets 102,737 137,500
Accumulated Other Comprehensive Loss:    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial (Gain) Loss (1,020) 128
Total Accumulated Other Comprehensive Loss (1,020) 128
Executive Survivor and Supplemental Retirement Plan    
Regulatory Assets:    
Unrecognized Prior Service Cost 0 0
Unrecognized Actuarial Loss 2,525 2,681
Total Regulatory Assets 2,525 2,681
Accumulated Other Comprehensive Loss:    
Unrecognized Prior Service Cost 0 1
Unrecognized Actuarial (Gain) Loss 10,660 12,030
Total Accumulated Other Comprehensive Loss 10,660 12,031
Other Postretirement Benefits Plan    
Regulatory Assets:    
Unrecognized Prior Service Cost (13,989) (19,579)
Unrecognized Actuarial Loss 26,852 32,238
Total Regulatory Assets 12,863 12,659
Accumulated Other Comprehensive Loss:    
Unrecognized Prior Service Cost (242) (386)
Unrecognized Actuarial (Gain) Loss (160) 21
Total Accumulated Other Comprehensive Loss $ (402) $ (365)