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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation The reconciliation of the statutory federal income tax rate to our effective tax rate for each of the three months ended March 31, 2022 and 2021 is as follows:
Three Months Ended March 31,
20222021
Federal Statutory Rate21.0 %21.0 %
Increases (Decreases) in Tax from:
State Taxes on Income, Net of Federal Tax5.0 5.0 
Production Tax Credits (PTCs)(4.4)(7.6)
Amortization of Excess Deferred Income Taxes(1.3)(2.9)
Excess Tax Deduction on Stock Awards(0.5)(0.1)
North Dakota Wind Tax Credit Amortization, Net of Federal Tax(0.2)(0.4)
Corporate-Owned Life Insurance0.2 (0.5)
Other, Net(0.1)0.3 
Effective Tax Rate19.7 %14.8 %