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Pension Plan and Other Postretirement Benefits - Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Regulatory Assets:      
Unrecognized Prior Service Cost $ 0 $ 0  
Unrecognized Actuarial Loss 137,500 120,592  
Total Regulatory Assets 137,500 120,592  
Projected Benefit Obligation Liability – Net Amount Recognized (428,396) (384,785) $ (328,442)
Accumulated Other Comprehensive Loss:      
Unrecognized Prior Service Cost 0 0  
Unrecognized Actuarial (Gain) Loss 128 (82)  
Total Accumulated Other Comprehensive Loss 128 (82)  
Noncurrent Liability 67,718 55,004  
Executive Survivor and Supplemental Retirement Plan      
Regulatory Assets:      
Unrecognized Prior Service Cost 0 0  
Unrecognized Actuarial Loss 2,681 2,170  
Total Regulatory Assets 2,681 2,170  
Projected Benefit Obligation Liability – Net Amount Recognized (47,894) (43,966) (39,699)
Accumulated Other Comprehensive Loss:      
Unrecognized Prior Service Cost 1 1  
Unrecognized Actuarial (Gain) Loss 12,030 9,170  
Total Accumulated Other Comprehensive Loss 12,031 9,171  
Other Postretirement Benefits Plan      
Regulatory Assets:      
Unrecognized Prior Service Cost (19,579) (20,363)  
Unrecognized Net Actuarial Loss (Gain) 32,238 35,322  
Total Regulatory Assets 12,659 14,959  
Projected Benefit Obligation Liability – Net Amount Recognized (70,185) (71,437) $ (71,561)
Accumulated Other Comprehensive Loss:      
Unrecognized Prior Service Cost (386) (501)  
Unrecognized Actuarial (Gain) Loss 21 184  
Total Accumulated Other Comprehensive Loss $ (365) $ (317)