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Income Taxes:
 3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income Tax Expense and Effective Tax Rates

Three Months Ended March 31, 2022 Compared to the Three Months Ended March 31, 2021

Income tax expense for the three months ended March 31, 2022 was $14.5 million compared to $0.5 million reported for the same period in 2021. For the three months ended March 31, 2022, the effective tax rate was 10.7% compared to 0.5% for the same period in 2021. The higher effective tax rate is primarily due to $7.6 million of prior year tax benefits from Colorado Electric TCJA-related bill credits to customers (which were offset by reduced revenue).