XML 67 R55.htm IDEA: XBRL DOCUMENT v3.21.1
Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income tax benefit (expense) $ (494) $ (16,002)
Effective Tax Rate 0.50% 14.10%
Effective Income Tax Reconciliation, Tax Benefit From Amortization Of Excess Deferred Income Taxes $ 1,500  
Wind Assets    
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount 1,300  
Colorado Electric    
Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount, Tax Benefit from Bill Credit $ 7,600