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Income Taxes - Schedule of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current
Federal Income Taxes	$ 36,238	$ 41,253	$ 31,949
State Income Taxes	6,533	15,126	9,568
Deferred
Federal Income Taxes	13,078	9,832	22,480
State Income Taxes	9,979	3,676	9,943
Tax Credits
North Dakota Wind Tax Credit Amortization, Net of Federal Tax	(586)	(586)	(586)
Investment Tax Credit Amortization	(12)	(3)	(3)
Income Taxes at Effective Tax Rate	$ 65,230	$ 69,298	$ 73,351

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