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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Outstanding credit facilities | The following table summarizes the outstanding revolving credit facilities of the Company's subsidiaries:
Company | Facility | Facility Limit |  | Amount Outstanding at December 31, 2020 | Amount Outstanding at December 31, 2019 | Letters of Credit at December 31, 2020 |  | Expiration Date
|  | (In millions)
Montana-Dakota Utilities Co. | Commercial paper/Revolving credit agreement (a) | $ | 175.0 |  |  | $ | 87.7 |  | $ | 118.6 |  | $ | — |  |  | 12/19/24
Cascade Natural Gas Corporation | Revolving credit agreement | $ | 100.0 |  | (b) | $ | 54.0 |  | $ | 64.6 |  | $ | 2.2 |  | (c) | 6/7/24
Intermountain Gas Company | Revolving credit agreement | $ | 85.0 |  | (d) | $ | 41.9 |  | $ | 24.5 |  | $ | — |  |  | 6/7/24
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement (e) | $ | 600.0 |  |  | $ | 37.9 |  | $ | 104.3 |  | $ | — |  |  | 12/19/24
(a) The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Montana-Dakota on stated conditions, up to a maximum of $225.0 million). There were no amounts outstanding under the revolving credit agreement. (b) Certain provisions allow for increased borrowings, up to a maximum of $125.0 million. (c) Outstanding letter(s) of credit reduce the amount available under the credit agreement. (d) Certain provisions allow for increased borrowings, up to a maximum of $110.0 million. (e) 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 $700.0 million). There were no amounts outstanding under the revolving credit agreement.
Long term debt outstanding | Long-term debt outstanding was as follows:
| Weighted Average Interest Rate at December 31, 2020 | 2020 | 2019
|  | (In thousands)
Senior Notes due on dates ranging from October 22, 2022 to October 30, 2060 | 4.40 | % | $ | 1,950,000 |  | $ | 1,850,000 |
Commercial paper supported by revolving credit agreements | .28 | % | 125,600 |  | 222,900 |
Credit agreements due on June 7, 2024 | 1.88 | % | 95,900 |  | 89,050 |
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029 | 7.32 | % | 35,000 |  | 50,000 |
Term Loan Agreement due on September 3, 2032 | 2.00 | % | 8,400 |  | 9,100 |
Other notes due on dates ranging from July 15, 2021 to November 30, 2038 | .75 | % | 4,034 |  | 29,117 |
Less unamortized debt issuance costs |  | 5,803 |  | 7,010 |
Less discount |  | 1 |  | 50 |
Total long-term debt |  | 2,213,130 |  | 2,243,107 |
Less current maturities |  | 1,555 |  | 16,540 |
Net long-term debt |  | $ | 2,211,575 |  | $ | 2,226,567 |
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, 2020, were as follows:
| 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter
| (In thousands)
Long-term debt maturities | $ | 1,555 |  | $ | 148,021 |  | $ | 77,921 |  | $ | 282,922 |  | $ | 177,802 |  | $ | 1,530,713 |

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