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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  |  | Amount Outstanding at December 31, 2016 |  |  | Letters of Credit at December 31, 2017 |  |  | Expiration Date
|  |  | (In millions)
MDU Resources Group, Inc. | Commercial paper/Revolving credit agreement | (a) | $ | 175.0 |  |  | $ | 73.8 |  | (b) | $ | 111.0 |  | (b) | $ | — |  |  | 5/8/19
Cascade Natural Gas Corporation | Revolving credit agreement |  | $ | 75.0 |  | (c) | $ | 17.3 |  |  | $ | — |  |  | $ | 2.2 |  | (d) | 4/24/20
Intermountain Gas Company | Revolving credit agreement |  | $ | 85.0 |  | (e) | $ | 40.0 |  |  | $ | 20.9 |  |  | $ | — |  |  | 4/24/20
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement | (f) | $ | 500.0 |  |  | $ | 14.6 |  | (b) | $ | 151.0 |  | (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 revolving credit agreement.
(b) | Amount outstanding under commercial paper program.
(c) | Certain provisions allow for increased borrowings, up to a maximum of $100.0 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 $110.0 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 revolving credit agreement.
Long term debt outstanding | Long-term debt outstanding was as follows:
| Weighed Average Interest Rate at December 31, 2017 | December 31, 2017 |  | December 31, 2016 |
|  | (In thousands)
Senior Notes due on dates ranging from June 19, 2018 to January 15, 2055 | 4.71 | % | $ | 1,499,916 |  | $ | 1,437,831 |
Commercial paper supported by revolving credit agreements | 1.72 | % | 88,350 |  | 262,000 |
Medium-Term Notes due on dates ranging from September 1, 2020 to March 16, 2029 | 6.68 | % | 50,000 |  | 50,000 |
Other notes due on dates ranging from July 1, 2019 to November 30, 2038 | 5.24 | % | 24,982 |  | 24,471 |
Credit agreements due on April 24, 2020 | 3.71 | % | 57,300 |  | 21,793 |
Less unamortized debt issuance costs |  | 5,694 |  | 5,832 |
Less discount |  | 1 |  | 104 |
Total long-term debt |  | 1,714,853 |  | 1,790,159 |
Less current maturities |  | 148,499 |  | 43,598 |
Net long-term debt |  | $ | 1,566,354 |  | $ | 1,746,561 |
Schedule of debt maturities | Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, for the five years and thereafter following December 31, 2017, were as follows:
| 2018 | 2019 | 2020 | 2021 | 2022 | Thereafter |
| (In thousands)
Long-term debt maturities | $ | 148,499 |  | $ | 125,504 |  | $ | 73,012 |  | $ | 15,312 |  | $ | 147,214 |  | $ | 1,211,007 |

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