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Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Thousands	Mar. 01, 2021	Jan. 26, 2021 USD ($) mi	Sep. 11, 2020 USD ($) mi	May 19, 2020 USD ($)	Dec. 11, 2019 USD ($) utility	Feb. 01, 2019 USD ($) gas_distribution_territory
Public Utilities, General Disclosures [Line Items]
Public Utilities, Number of Gas Distribution Territories Consolidating | gas_distribution_territory						2
Colorado Public Utilities Commission (CPUC) | Black Hills Energy, Colorado Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi			7,000
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 13,500			$ 2,500
Public Utilities, Requested Equity Capital Structure, Percentage			50.00%
Public Utilities, Requested Debt Capital Structure, Percentage			50.00%
Public Utilities, Requested Return on Equity, Percentage			9.95%
Public Utilities, Term Extension of System Saftey and Integrity Rider			5 years
Public Utilities, Approved Rate Increase (Decrease), Amount				$ (600)
Public Utilities, Approved Return on Equity, Percentage				9.20%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy, Rocky Mountain Natural Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount						$ 33,000
Wyoming Public Service Commission (WPSC) | Black Hills Energy, Wyoming Gas
Public Utilities, General Disclosures [Line Items]
Public Utilities, Number of Gas Distribution Territories Consolidating | utility					4
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 13,000
Public Utilities, Approved Return on Equity, Percentage					9.40%
Public Utilities, Approved Equity Capital Structure, Percentage					50.23%
Public Utilities, Approved Debt Capital Structure, Percentage					49.77%
Nebraska Publc Service Commission (NPSC) | Black Hills Energy - Nebraska Gas | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Public Utilities, Term Extension of System Saftey and Integrity Rider	5 years
Public Utilities, Approved Return on Equity, Percentage	950.00%
Public Utilities, Approved Equity Capital Structure, Percentage	50.00%
Nebraska Publc Service Commission (NPSC) | Black Hills Energy - Nebraska Gas | Rate Review Filed with the Regulatory Agency | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi		13,000
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 6,500
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates		$ 4,600

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