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Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Regulatory Assets [Line Items]    
Regulatory assets $ 13,565 $ 1,358
Regulatory assets, noncurrent 15,951 18,312
Total regulatory assets 29,516 19,670
Regulatory Liabilities [Line Items]    
Regulatory liabilities 145,243 158
Regulatory liabilities 271,706 388,433
Total regulatory liabilities 416,949 388,591
Customer tax refund [Domain]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 125,506 0
Regulatory liabilities 0 102,059
Fuel recovery    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 0 158
Postretirement benefits    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 42,207 40,980
Deferred federal taxes-liability    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 18,643 0
Regulatory liabilities 187,883 206,527
Deferred state taxes - liability    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 1,094 0
Regulatory liabilities 11,026 12,120
Asset retirement obligations, net [Member]    
Regulatory Liabilities [Line Items]    
Regulatory liabilities 30,590 26,747
Fuel recovery    
Regulatory Assets [Line Items]    
Regulatory assets 11,871 107
Levelized depreciation    
Regulatory Assets [Line Items]    
Regulatory assets 1,694 1,251
Regulatory assets, noncurrent 11,601 13,581
Grossed-up deferred taxes on equity funds used during construction    
Regulatory Assets [Line Items]    
Regulatory assets, noncurrent $ 4,350 $ 4,731