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Commitment, Contingencies And Guarantees: Manufactured Gas Processing (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Regulatory assets | $ 796,599 | $ 278,258
Environmental |  |
Loss Contingencies [Line Items] |  |
Regulatory assets | 1,385 | $ 1,413
Manufactured Gas Plant | Gas Utilities |  |
Loss Contingencies [Line Items] |  |
Insurance Settlements Receivable, Noncurrent | 1,200 |
Manufactured Gas Plant | Gas Utilities | Black Hills Energy - Iowa Gas |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies, Gross | 2,600 |
Manufactured Gas Plant | Gas Utilities | Black Hills Energy - Nebraska Gas |  |
Loss Contingencies [Line Items] |  |
Accrual for Environmental Loss Contingencies, Gross | 600 |
Manufactured Gas Plant | Gas Utilities | Environmental |  |
Loss Contingencies [Line Items] |  |
Regulatory assets | $ 1,400 |

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