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Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal Income Taxes	$ 41,253	$ 31,949	$ 6,806
State Income Taxes	15,126	9,568	939
Deferred
Federal Income Taxes	9,832	22,480	18,180
State Income Taxes	3,676	9,943	10,716
Tax Credits
North Dakota Wind Tax Credit Amortization, Net of Federal Tax	(586)	(586)	(586)
Investment Tax Credit Amortization	(3)	(3)	(3)
Income Tax Expense (Benefit)	$ 69,298	$ 73,351	$ 36,052

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