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Debt (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 |  |  | Amount Outstanding at December 31, 2015 |  |  | Letters of Credit at December 31, 2016 |  |  | Expiration Date
|  |  | (In millions)
MDU Resources Group, Inc. | Commercial paper/Revolving credit agreement | (a) | $ | 175.0 |  |  | $ | 111.0 |  | (b) | $ | 44.5 |  | (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) | $ | 20.9 |  |  | $ | 47.9 |  |  | $ | — |  |  | 7/13/18
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement | (f) | $ | 500.0 |  |  | $ | 151.0 |  | (b) | $ | 18.0 |  | (b) | $ | — |  |  | 9/23/21
(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 $600.0 million). There were no amounts outstanding under the credit agreement.
Long term debt outstanding | Long-term debt outstanding at December 31 was as follows:
| 2016 |  | 2015 |
| (In thousands)
Senior Notes at a weighted average rate of 4.87%, due on dates ranging from August 31, 2017 to January 15, 2055 | $ | 1,437,831 |  | $ | 1,616,246 |
Commercial paper at a weighted average rate of 1.27%, supported by revolving credit agreements | 262,000 |  | 62,500 |
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 |  | 50,000 |
Other notes at a weighted average rate of 5.25%, due on February 1, 2035 | 24,471 |  | 24,589 |
Credit agreements at a weighted average rate of 3.14%, due on dates ranging from July 13, 2018 to November 30, 2038 | 21,793 |  | 48,906 |
Unamortized debt issuance costs | (5,832 | ) | (6,069 | )
Discount | (104 | ) | (9 | )
Total long-term debt | 1,790,159 |  | 1,796,163 |
Less current maturities | 43,598 |  | 238,539 |
Net long-term debt | $ | 1,746,561 |  | $ | 1,557,624 |
Schedule of debt maturities | Schedule of Debt Maturities Long-term debt maturities for the five years and thereafter following December 31, 2016, were as follows:
| 2017 | 2018 | 2019 | 2020 | 2021 | Thereafter |
| (In thousands)
Long-term debt maturities | $ | 43,598 |  | $ | 169,449 |  | $ | 162,154 |  | $ | 15,021 |  | $ | 151,013 |  | $ | 1,254,860 |

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