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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
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, 2012 |  |  | Amount Outstanding at December 31, 2011 |  |  | Letters of Credit at December 31, 2012 |  |  | Expiration Date |
|  |  | (In millions)
MDU Resources Group, Inc. | Commercial paper/Revolving credit agreement | (a) | $ | 125.0 |  |  | $ | 76.0 |  | (b) | $ | — |  | (b) | $ | — |  |  | 10/4/17 |
Cascade Natural Gas Corporation | Revolving credit agreement |  | $ | 50.0 |  | (c) | $ | 2.0 |  |  | $ | — |  |  | $ | — |  |  | 12/27/13 |
Intermountain Gas Company | Revolving credit agreement |  | $ | 65.0 |  | (d) | $ | 26.2 |  |  | $ | 8.1 |  |  | $ | — |  |  | 8/11/13 |
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement | (e) | $ | 500.0 |  |  | $ | 217.0 |  | (b) | $ | — |  | (b) | $ | 20.2 |  | (f) | 6/8/17 |
(a) The $125 million commercial paper program is supported by a revolving credit agreement with various banks totaling $125 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. (c) Certain provisions allow for increased borrowings, up to a maximum of $75 million. (d) Certain provisions allow for increased borrowings, up to a maximum of $80 million. (e) The $500 million commercial paper program is supported by a revolving credit agreement with various banks totaling $500 million (provisions allow for increased borrowings, at the option of Centennial on stated conditions, up to a maximum of $650 million). There were no amounts outstanding under the credit agreement. (f) The outstanding letters of credit, as discussed in Note 19, reduce amounts available under the credit agreement.
Long term debt outstanding | Long-term debt outstanding at December 31 was as follows:
| 2012 |  | 2011 |
| (In thousands)
Senior Notes at a weighted average rate of 5.74%, due on dates ranging from January 17, 2013 to May 15, 2043 | $ | 1,349,160 |  | $ | 1,287,576 |
Commercial paper at a weighted average rate of .51%, supported by revolving credit agreements | 293,000 |  | — |
Medium-Term Notes at a weighted average rate of 7.58%, due on dates ranging from February 4, 2013 to March 16, 2029 | 59,000 |  | 81,000 |
Other notes at a weighted average rate of 5.24%, due on dates ranging from September 1, 2020 to February 1, 2035 | 40,090 |  | 40,469 |
Credit agreements at a weighted average rate of 5.22%, due on dates ranging from November 27, 2013 to November 30, 2038 | 3,768 |  | 15,633 |
Discount | (43 | ) | — |
Total long-term debt | 1,744,975 |  | 1,424,678 |
Less current maturities | 134,108 |  | 139,267 |
Net long-term debt | $ | 1,610,867 |  | $ | 1,285,411 |

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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 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 10: 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 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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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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