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Regulatory Matters: Tax Cut and Jobs Act (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Jan. 01, 2022 | Jan. 26, 2021 | Dec. 30, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Benefit from Relieved TCJA Related Liabilities |  | $ 4,000 |  |  |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Settlement of plan to provide TCJA-related customer billing credits to its customers |  |  |  |  | $ 9,300
Annual TCJA-Related Customer Billing Credits | $ 900 |  |  |  |
Nebraska Public Service Commission (NPSC) | Black Hills Energy - Nebraska Gas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Settlement of plan to provide TCJA-related customer billing credits to its customers |  |  |  | $ 2,900 |
Kansas Corporation Commission (KCC) | Black Hills Energy, Kansas Gas | Subsequent Event |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually |  |  | $ 3,000 |  |
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers |  |  | $ 9,100 |  |

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