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Subsquent events	9 Months Ended
	Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent events [Text Block]	Subsequent events On October 1, 2013, MDU Energy Capital entered into a $30.0 million credit agreement with a maturity date of March 30, 2014. Cascade entered into a note purchase agreement on October 30, 2013, and issued $50.0 million of Senior Notes with due dates ranging from August 2025 to August 2028 at a weighted average interest rate of 4.24 percent. Intermountain entered into a note purchase agreement on October 30, 2013, and issued $50.0 million of Senior Notes with due dates ranging from October 2025 to October 2028 at a weighted average interest rate of 4.21 percent. On November 1, 2013, Centennial issued $25.0 million of Senior Notes under a note purchase agreement dated June 27, 2013, with due dates ranging from November 2023 to November 2028 at a weighted average interest rate of 4.84 percent.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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