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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current
Federal Income Taxes	$ 31,949	$ 6,806	$ 3,631
State Income Taxes	9,568	939	2,415
Deferred
Federal Income Taxes	22,480	18,180	11,450
State Income Taxes	9,943	10,716	3,751
Tax Credits
North Dakota Wind Tax Credit Amortization, Net of Federal Tax	(586)	(586)	(1,033)
Investment Tax Credit Amortization	(3)	(3)	(8)
Income Tax Expense (Benefit)	$ 73,351	$ 36,052	$ 20,206

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