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Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2022 | Amount Outstanding at December 31, 2021 | Letters of Credit at December 31, 2022 |  | Expiration Date
|  | (In millions)
Montana-Dakota Utilities Co. | Commercial paper/Revolving credit agreement (a) | $ | 175.0 |  |  | $ | 117.5 |  | $ | 64.9 |  | $ | — |  |  | 12/19/24
Cascade Natural Gas Corporation | Revolving credit agreement | $ | 100.0 |  | (b) | $ | 44.4 |  | $ | 71.0 |  | $ | 2.2 |  | (c) | 11/30/27
Intermountain Gas Company | Revolving credit agreement | $ | 100.0 |  | (d) | $ | 85.6 |  | $ | 56.5 |  | $ | — |  |  | 10/13/27
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement (e) | $ | 600.0 |  |  | $ | 298.0 |  | $ | 385.4 |  | $ | — |  |  | 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). At December 31, 2022 and 2021, 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 $125.0 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). At December 31, 2022 and 2021, 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, 2022 | 2022 | 2021
|  | (In thousands)
Senior Notes due on dates ranging from May 15, 2023 to June 15, 2062 | 4.32 | % | $ | 2,258,500 |  | $ | 2,125,000 |
Commercial paper supported by revolving credit agreements | 5.13 | % | 415,500 |  | 450,300 |
Credit agreements due on October 13, 2027 and November 30, 2027 | 6.31 | % | 130,000 |  | 127,500 |
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029 | 7.32 | % | 35,000 |  | 35,000 |
Term Loan Agreement due on September 3, 2032 | 3.64 | % | 7,000 |  | 7,700 |
Other notes due on dates ranging from March 1, 2024 to January 1, 2061 | 1.00 | % | 2,253 |  | 2,564 |
Less unamortized debt issuance costs |  | 6,542 |  | 6,090 |
Less discount |  | 286 |  | 74 |
Total long-term debt |  | 2,841,425 |  | 2,741,900 |
Less current maturities |  | 78,031 |  | 148,053 |
Net long-term debt |  | $ | 2,763,394 |  | $ | 2,593,847 |
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, 2022, were as follows:
| 2023 | 2024 | 2025 | 2026 | 2027 | Thereafter
| (In thousands)
Long-term debt maturities | $ | 78,031 |  | $ | 476,923 |  | $ | 177,802 |  | $ | 140,802 |  | $ | 230,802 |  | $ | 1,743,893 |

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