XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.21.1

Income Taxes (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
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 months ended March 31, 2021 and 2020 is as follows:
| 2021 |  | 2020 |  |  |  |
Federal Statutory Rate | 21.0 | % |  | 21.0 | % |  |  |  |
Increases (Decreases) in Tax from: |  |  |  |  |  |  |
State Taxes on Income, Net of Federal Tax | 5.0 |  |  | 5.0 |  |  |  |  |
Production Tax Credits (PTCs) | (7.6) |  |  | — |  |  |  |  |
Amortization of Excess Deferred Income Taxes | (2.9) |  |  | (4.1) |  |  |  |  |
Corporate-Owned Life Insurance | (0.5) |  |  | 0.7 |  |  |  |  |
North Dakota Wind Tax Credit Amortization, Net of Federal Tax | (0.4) |  |  | (0.9) |  |  |  |  |
Excess Tax Deduction on Stock Awards | (0.1) |  |  | (1.3) |  |  |  |  |
Allowance for Equity Funds Used During Construction | — |  |  | (1.0) |  |  |  |  |
Other, Net | 0.3 |  |  | (0.5) |  |  |  |  |
Effective Tax Rate | 14.8 | % |  | 18.9 | % |  |  |  |

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration