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Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Federal statutory tax rate |  |  | 21.00% | 21.00% | 21.00% | 21.00% | 35.00%
Regulatory liability, current |  |  | $ 77,149 | $ 46,435 |  |  |
Effective income tax rate reconciliation, excess deferred income tax reversal amount |  |  |  | $ 8,476 | $ 5,690 |  |
Washington Utilities and Transportation Commission [Member] |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Effective income tax rate reconciliation, excess deferred income tax reversal amount | $ 8,400 |  |  |  |  |  |
Washington Utilities and Transportation Commission [Member] | Income Tax Related [Member] |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory liability, current | $ 10,900 |  |  |  |  |  |
Idaho Public Utilities Commission [Member] |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Effective income tax rate reconciliation, excess deferred income tax reversal amount |  | $ 5,100 |  |  |  |  |
Idaho Public Utilities Commission [Member] | Income Tax Related [Member] |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory liability, current |  | $ 6,400 |  |  |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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