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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current      
Federal Income Taxes $ 6,806 $ 3,631 $ 5,156
State Income Taxes 939 2,415 1,333
Deferred      
Federal Income Taxes 18,180 11,450 8,859
State Income Taxes 10,716 3,751 3,167
Tax Credits      
North Dakota Wind Tax Credit Amortization, Net of Federal Tax (586) (1,033) (1,033)
Investment Tax Credit Amortization (3) (8) (41)
Income Tax Expense (Benefit) $ 36,052 $ 20,206 $ 17,441