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Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Thousands	Dec. 31, 2021 USD ($) mi	Dec. 30, 2021 mi	Dec. 28, 2021 USD ($)	Dec. 10, 2021 USD ($) mi	Oct. 08, 2021 USD ($)	Jul. 06, 2021	Mar. 01, 2021 USD ($) mi	Sep. 11, 2020	Jun. 01, 2021 mi
Arkansas Public Service Commission (APSC) | Black Hills Energy - Arkansas 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				7,200
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 22,000
Public Utilities, Approved Equity Capital Structure, Percentage				50.90%
Public Utilities, Approved Debt Capital Structure, Percentage				49.10%
Public Utilities, Requested Return on Equity, Percentage				10.20%
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, Requested Term Extension of System Safety and Integrity Rider								5 years
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC.
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi	7,000
Public Utilities, Approved Equity Capital Structure, Percentage	50.30%
Public Utilities, Approved Debt Capital Structure, Percentage	49.70%
Public Utilities, Approved Return on Equity, Percentage	9.20%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 6,500
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Rate Review Approved by Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities, Term Extension of System Safety and Integrity Rider						3 years
Iowa Utilities Board (IUB) | Black Hills Energy - Iowa Gas | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi									5,000
Public Utilities, Approved Equity Capital Structure, Percentage			50.00%
Public Utilities, Approved Debt Capital Structure, Percentage			50.00%
Public Utilities, Approved Return on Equity, Percentage			9.60%
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 3,700
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates			$ 2,200
Kansas Corporation Commission (KCC) | Black Hills Energy, Kansas Gas | Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider.
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi		4,600
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates					$ 6,600
Public Utilities, Term Extension of System Safety and Integrity Rider		5 years
Nebraska Publc Service Commission (NPSC) | Black Hills Energy - Nebraska Gas | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi							13,000
Public Utilities, Approved Equity Capital Structure, Percentage							50.00%
Public Utilities, Approved Return on Equity, Percentage							9.50%
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 6,500
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates							$ 4,600
Public Utilities, Term Extension of System Saftey and Integrity Rider							5 years

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