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Financing: Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Aug. 26, 2021 | Dec. 31, 2020 | Jun. 17, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 4,153,801 |  | $ 3,561,345 |
Less current maturities | 0 |  | 8,436 |
Less unamortized deferred financing costs | 26,878 |  | 24,809 |
Long-term debt, net of current maturities | 4,126,923 |  | 3,528,100 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less unamortized deferred financing costs | 2,500 |  | 1,000 |
Senior Unsecured Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) |  | 1.037% |  |
Less unamortized deferred financing costs |  | $ 3,700 |  |
Corporate, Non-Segment | Senior Unsecured Notes Due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) |  |  |  | 2.50%
Black Hills Corporation | Corporate, Non-Segment |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 3,625,000 |  | 3,026,436 |
Less unamortized debt discount | (6,125) |  | (7,013) |
Total long-term debt | $ 3,618,875 |  | 3,019,423 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.25% |  |  |
Long-term debt | $ 525,000 |  | 525,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 1.04% |  |  |
Long-term debt | $ 600,000 |  | 0 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 3.95% |  |  |
Long-term debt | $ 300,000 |  | 300,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 3.15% |  |  |
Long-term debt | $ 400,000 |  | 400,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 3.05% |  |  |
Long-term debt | $ 400,000 |  | 400,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 2.50% |  |  |
Long-term debt | $ 400,000 |  | 400,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2033 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.35% |  |  |
Long-term debt | $ 400,000 |  | 400,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2046 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.20% |  |  |
Long-term debt | $ 300,000 |  | 300,000 |
Black Hills Corporation | Corporate, Non-Segment | Senior Unsecured Notes Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 3.88% |  |  |
Long-term debt | $ 300,000 |  | 300,000 |
Black Hills Corporation | Corporate, Non-Segment | Corporate Term Loan Due June 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 0 |  | 1,436 |
Black Hills Energy - South Dakota Electric | Electric Utilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 340,000 |  | 340,000 |
Less unamortized debt discount | (74) |  | (78) |
Total long-term debt | $ 339,926 |  | 339,922 |
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2032 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 7.23% |  |  |
Long-term debt | $ 75,000 |  | 75,000 |
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2039 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 6.13% |  |  |
Long-term debt | $ 180,000 |  | 180,000 |
Black Hills Energy - South Dakota Electric | Electric Utilities | First Mortgage Bonds Due 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.43% |  |  |
Long-term debt | $ 85,000 |  | 85,000 |
Wyoming Electric | Electric Utilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 195,000 |  | 202,000 |
Less unamortized debt discount | 0 |  | 0 |
Total long-term debt | $ 195,000 |  | 202,000 |
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.53% |  |  |
Long-term debt | $ 75,000 |  | 75,000 |
Wyoming Electric | Electric Utilities | Industrial Development Revenue Bonds Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0 |  | 7,000 |
Wyoming Electric | Electric Utilities | Industrial Development Revenue Bonds Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable interest rate (percent) | 0.15% |  |  |
Long-term debt | $ 10,000 |  | 10,000 |
Wyoming Electric | Electric Utilities | First Mortgage Bonds Due 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 6.67% |  |  |
Long-term debt | $ 110,000 |  | $ 110,000 |

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