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Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Outstanding credit facilities | The following table summarizes the outstanding revolving credit facilities of the Company and its subsidiaries:
Company | Facility |  | Facility Limit |  |  | Amount Outstanding at December 31, 2015 |  |  | Amount Outstanding at December 31, 2014 |  |  | Letters of Credit at December 31, 2015 |  |  | Expiration Date
|  |  | (In millions)
MDU Resources Group, Inc. | Commercial paper/Revolving credit agreement | (a) | $ | 175.0 |  |  | $ | 44.5 |  | (b) | $ | 77.5 |  | (b) | $ | — |  |  | 5/8/19
Cascade Natural Gas Corporation | Revolving credit agreement |  | $ | 50.0 |  | (c) | $ | — |  |  | $ | — |  |  | $ | 2.2 |  | (d) | 7/9/18
Intermountain Gas Company | Revolving credit agreement |  | $ | 65.0 |  | (e) | $ | 47.9 |  |  | $ | 21.0 |  |  | $ | — |  |  | 7/13/18
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement | (f) | $ | 650.0 |  |  | $ | 18.0 |  | (b) | $ | 211.0 |  | (b) | $ | 39.4 |  |  | 5/8/19
Dakota Prairie Refining, LLC | Revolving credit agreement |  | $ | 75.0 |  |  | $ | 45.5 |  |  | $ | — |  |  | $ | 18.3 |  | (d) | 6/30/16
(a) | The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of the Company on stated conditions, up to a maximum of $225.0 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 $75.0 million.
(d) | Outstanding letter(s) of credit reduce the amount available under the credit agreement.
(e) | Certain provisions allow for increased borrowings, up to a maximum of $90.0 million.
(f) | The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Centennial on stated conditions, up to a maximum of $800.0 million). There were no amounts outstanding under the credit agreement.
Long term debt outstanding | Long-term debt outstanding at December 31 was as follows:
| 2015 |  | 2014 |
| (In thousands)
Senior Notes at a weighted average rate of 5.18%, due on dates ranging from February 1, 2016 to January 15, 2055 | $ | 1,616,246 |  | $ | 1,636,662 |
Commercial paper at a weighted average rate of .73%, supported by revolving credit agreements | 62,500 |  | 288,500 |
Term Loan Agreements at a weighted average rate of 2.16%, due on dates ranging from April 22, 2018 to April 22, 2023 | 69,000 |  | 72,000 |
Medium-Term Notes at a weighted average rate of 6.68%, due on dates ranging from September 1, 2020 to March 16, 2029 | 50,000 |  | 35,000 |
Other notes at a weighted average rate of 5.25%, due on February 1, 2035 | 24,589 |  | 39,662 |
Credit agreements at a weighted average rate of 1.82%, due on dates ranging from July 14, 2018 to November 30, 2038 | 48,906 |  | 22,042 |
Discount | (9 | ) | (36 | )
Total long-term debt | 1,871,232 |  | 2,093,830 |
Less current maturities | 243,789 |  | 268,552 |
Net long-term debt | $ | 1,627,443 |  | $ | 1,825,278 |

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