Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Short-term Debt (Details 2) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 19, 2022	Oct. 21, 2022	Mar. 18, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Short-term borrowings	$ 246,500				$ 0
Term Loan Agreement [Member] \| MDU Energy Capital
Short-term Debt [Line Items]
Short-term borrowings			$ 11,500
Ratio of total debt to total capitalization as specified in debt covenants			70.00%
Term Loan Agreement [Member] \| Centennial Energy Holdings, Inc.
Short-term Debt [Line Items]
Short-term borrowings		$ 135,000		$ 100,000
Ratio of total debt to total capitalization as specified in debt covenants		65.00%		65.00%