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Debt (Tables) | 12 Months Ended
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Dec. 31, 2011
Debt Disclosure [Abstract] |
Outstanding Credit Facilities | The following table summarizes the outstanding credit facilities of the Company and its subsidiaries:
Company |  | Facility |  | Facility Limit |  |  | Amount Outstanding at December 31, 2011 |  |  | Amount Outstanding at December 31, 2010 |  |  | Letters of Credit at December 31, 2011 |  |  | Expiration Date |
|  |  |  | (Dollars in millions)
MDU Resources Group, Inc. |  | Commercial paper/Revolving credit agreement | (a) | $ | 100.0 |  |  | $ | — |  | (h) | $ | 20.0 |  | (b) | $ | — |  |  | 5/26/15 |
Cascade Natural Gas Corporation |  | Revolving credit agreement |  | $ | 50.0 |  | (c) | $ | — |  |  | $ | — |  |  | $ | 1.9 |  | (d) | 12/28/12 | (e)
Intermountain Gas Company |  | Revolving credit agreement |  | $ | 65.0 |  | (f) | $ | 8.1 |  |  | $ | 20.2 |  |  | $ | — |  |  | 8/11/13 |
Centennial Energy Holdings, Inc. |  | Commercial paper/Revolving credit agreement | (g) | $ | 400.0 |  |  | $ | — |  | (h) | $ | — |  | (h) | $ | 21.6 |  | (d) | 12/13/12 |
(a) The $125 million commercial paper program is supported by a revolving credit agreement with various banks totaling $100 million (provisions allow for increased borrowings, at the option of the Company on stated conditions, up to a maximum of $150 million). There were no amounts outstanding under the credit agreement. (b) Amount outstanding under commercial paper program that was classified as short-term borrowings because the revolving credit agreement expired within one year. (c) Certain provisions allow for increased borrowings, up to a maximum of $75 million. (d) The outstanding letters of credit, as discussed in Note 19, reduce amounts available under the credit agreement. (e) Provisions allow for an extension of up to two years upon consent of the banks. (f) Certain provisions allow for increased borrowings, up to a maximum of $80 million. (g) The $400 million commercial paper program is supported by a revolving credit agreement with various banks totaling $400 million (provisions allow for increased borrowings, at the option of Centennial on stated conditions, up to a maximum of $450 million). There were no amounts outstanding under the credit agreement.
(h) | Amount outstanding under commercial paper program.
Long Term Debt Outstanding | Long-term debt outstanding at December 31 was as follows:
| 2011 |  |  | 2010 |
| (In thousands)
Senior Notes at a weighted average rate of 6.01%, due on dates ranging from May 15, 2012 to March 8, 2037 | $ | 1,287,576 |  |  | $ | 1,358,848 |
Medium-Term Notes at a weighted average rate of 7.72%, due on dates ranging from September 4, 2012 to March 16, 2029 | 81,000 |  |  | 81,000 |
Other notes at a weighted average rate of 5.24%, due on dates ranging from September 1, 2020 to February 1, 2035 | 40,469 |  |  | 41,189 |
Credit agreements at a weighted average rate of 2.98%, due on dates ranging from September 30, 2012 to November 30, 2038 | 15,633 |  |  | 25,715 |
Total long-term debt | 1,424,678 |  |  | 1,506,752 |
Less current maturities | 139,267 |  |  | 72,797 |
Net long-term debt | $ | 1,285,411 |  |  | $ | 1,433,955 |
The amounts of scheduled long-term debt maturities for the five years and thereafter following December 31, 2011, aggregate $139.3 million in 2012; $267.3 million in 2013; $9.3 million in 2014; $266.4 million in 2015; $288.4 million in 2016 and $454.0 million thereafter.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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