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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2023
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation of the statutory federal income tax rate to our effective tax rate for each of the three and nine months ended September 30, 2023 and 2022 is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Income Taxes at Federal Statutory Rate | $ | 24,508 |  | 21.0 | % |  | $ | 22,418 |  | 21.0 | % |  | $ | 61,849 |  | 21.0 | % |  | $ | 64,748 |  | 21.0 | %
Increases (Decreases) in Tax from: |  |  |  |  |  |  |  |  |  |  |
State Taxes on Income, Net of Federal Tax | 5,832 |  | 5.0 |  |  | 5,338 |  | 5.0 |  |  | 14,725 |  | 5.0 |  |  | 15,416 |  | 5.0 |
Production Tax Credits (PTCs) | (5,192) |  | (4.4) |  |  | (3,828) |  | (3.6) |  |  | (14,421) |  | (4.9) |  |  | (12,514) |  | (4.1) |
Amortization of Excess Deferred Income Taxes | (741) |  | (0.6) |  |  | (955) |  | (0.9) |  |  | (2,161) |  | (0.7) |  |  | (2,033) |  | (0.7) |
North Dakota Wind Tax Credit Amortization, Net of Federal Tax | (220) |  | (0.2) |  |  | (150) |  | (0.1) |  |  | (530) |  | (0.2) |  |  | (505) |  | (0.2) |
Corporate-Owned Life Insurance | (120) |  | (0.1) |  |  | 241 |  | 0.2 |  |  | (998) |  | (0.3) |  |  | 1,383 |  | 0.4 |
Other, Net | 660 |  | 0.5 |  |  | (551) |  | (0.5) |  |  | (371) |  | (0.2) |  |  | (352) |  | 0.1 |
Income Tax Expense / Effective Tax Rate | $ | 24,727 |  | 21.2 | % |  | $ | 22,513 |  | 21.1 | % |  | $ | 58,093 |  | 19.7 | % |  | $ | 66,143 |  | 21.5 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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