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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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