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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income tax benefit (expense) $ (5,253) $ (4,651) $ (6,333) $ (25,484)
Effective Tax Rate     3.50% 13.60%
Effective Income Tax Reconciliation, Tax Benefit From Amortization Of Excess Deferred Income Taxes     $ 2,200  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount     1,900  
Effective Income Tax Reconciliation, Tax Flow-through Benefit from Repairs and Indirect Costs     1,100  
Wind Assets        
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount     3,200  
Colorado Electric and Nebraska Gas        
Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount, Tax Benefit from Bill Credit     $ 10,000