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Debt | 12 Months Ended
--- | ---
Dec. 31, 2018
Debt Disclosure [Abstract] |
Debt | Debt Certain debt instruments of the Company and its subsidiaries, including those discussed later, contain restrictive covenants and cross-default provisions. In order to borrow under the respective credit agreements, the Company and its subsidiaries must be in compliance with the applicable covenants and certain other conditions. At December 31, 2018, the Company and its subsidiaries, as applicable, complied with all applicable financial covenants and restrictions. In the event the Company and its subsidiaries do not comply with the applicable covenants and other conditions, alternative sources of funding may need to be pursued. The following table summarizes the outstanding revolving credit facilities of the Company and its subsidiaries:
Company | Facility |  | Facility Limit |  |  | Amount Outstanding at December 31, 2018 |  |  | Amount Outstanding at December 31, 2017 |  |  | Letters of Credit at December 31, 2018 |  |  | Expiration Date
|  |  | (In millions)
MDU Resources Group, Inc. | Commercial paper/Revolving credit agreement | (a) | $ | 175.0 |  |  | $ | 48.5 |  |  | $ | 73.8 |  | (b) | $ | — |  |  | 6/8/23
Cascade Natural Gas Corporation | Revolving credit agreement |  | $ | 75.0 |  | (c) | $ | 53.8 |  |  | $ | 17.3 |  |  | $ | 2.2 |  | (d) | 4/24/20
Intermountain Gas Company | Revolving credit agreement |  | $ | 85.0 |  | (e) | $ | 56.3 |  |  | $ | 40.0 |  |  | $ | — |  |  | 4/24/20
Centennial Energy Holdings, Inc. | Commercial paper/Revolving credit agreement | (f) | $ | 500.0 |  |  | $ | 289.6 |  | (b) | $ | 14.6 |  | (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). The amount outstanding under the revolving credit agreement was $48.5 million.
(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.
The Company's and Centennial's respective commercial paper programs are supported by revolving credit agreements. While the amount of commercial paper outstanding does not reduce available capacity under the respective revolving credit agreements, the Company and Centennial do not issue commercial paper in an aggregate amount exceeding the available capacity under their credit agreements. The commercial paper borrowings may vary during the period, largely the result of fluctuations in working capital requirements due to the seasonality of the construction businesses. The following includes information related to the preceding table. Long-term debt MDU Resources Group, Inc. The Company's revolving credit agreement supports its commercial paper program. Commercial paper borrowings under this agreement are classified as long-term debt as they are intended to be refinanced on a long-term basis through continued commercial paper borrowings. The credit agreement contains customary covenants and provisions, including covenants of the Company not to permit, as of the end of any fiscal quarter, (A) the ratio of funded debt to total capitalization (determined on a consolidated basis) to be greater than 65 percent or (B) the ratio of funded debt to capitalization (determined with respect to the Company alone, excluding its subsidiaries) to be greater than 65 percent. The Company's ratio of funded debt to total capitalization at December 31, 2018, was 45 percent. Other covenants include limitations on the sale of certain assets and on the making of certain loans and investments. There are no credit facilities that contain cross-default provisions between the Company and any of its subsidiaries. On January 1, 2019, the Company's revolving credit agreement and commercial paper program became Montana-Dakota's revolving credit agreement and commercial paper program as a result of the Holding Company Reorganization. The outstanding balance of the revolving credit agreement was also transferred to Montana-Dakota. All of the related terms and covenants of the credit agreements remained the same. For more information on the reorganization, see Note 1. Cascade Any borrowings under the revolving credit agreement are classified as long-term debt as they are intended to be refinanced on a long-term basis through continued borrowings. The credit agreement contains customary covenants and provisions, including a covenant of Cascade not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent. Cascade's ratio of total debt to total capitalization at December 31, 2018, was 51 percent. Other covenants include restrictions on the sale of certain assets, limitations on indebtedness and the making of certain investments. Cascade's credit agreement also contains cross-default provisions. These provisions state that if Cascade fails to make any payment with respect to any indebtedness or contingent obligation, in excess of a specified amount, under any agreement that causes such indebtedness to be due prior to its stated maturity or the contingent obligation to become payable, Cascade will be in default under the revolving credit agreement. Intermountain Any borrowings under the revolving credit agreement are classified as long-term debt as they are intended to be refinanced on a long-term basis through continued borrowings. The credit agreement contains customary covenants and provisions, including a covenant of Intermountain not to permit, at any time, the ratio of total debt to total capitalization to be greater than 65 percent. Intermountain's ratio of total debt to total capitalization at December 31, 2018, was 49 percent. Other covenants include restrictions on the sale of certain assets, limitations on indebtedness and the making of certain investments. Intermountain's credit agreement also contains cross-default provisions. These provisions state that if Intermountain fails to make any payment with respect to any indebtedness or contingent obligation, in excess of a specified amount, under any agreement that causes such indebtedness to be due prior to its stated maturity or the contingent obligation to become payable, or certain conditions result in an early termination date under any swap contract that is in excess of a specified amount, then Intermountain will be in default under the revolving credit agreement. Centennial Centennial's revolving credit agreement supports its commercial paper program. Commercial paper borrowings under this agreement are classified as long-term debt as they are intended to be refinanced on a long-term basis through continued commercial paper borrowings. Centennial's revolving credit agreement contains customary covenants and provisions, including a covenant of Centennial, not to permit, as of the end of any fiscal quarter, the ratio of total consolidated debt to total consolidated capitalization to be greater than 65 percent. Centennial's ratio of total debt to total capitalization at December 31, 2018, was 38 percent. Other covenants include restricted payments, restrictions on the sale of certain assets, limitations on subsidiary indebtedness, minimum consolidated net worth, limitations on priority debt and the making of certain loans and investments. Certain of Centennial's financing agreements contain cross-default provisions. These provisions state that if Centennial or any subsidiary of Centennial fails to make any payment with respect to any indebtedness or contingent obligation, in excess of a specified amount, under any agreement that causes such indebtedness to be due prior to its stated maturity or the contingent obligation to become payable, the applicable agreements will be in default. WBI Energy Transmission WBI Energy Transmission has a $200.0 million uncommitted note purchase and private shelf agreement with an expiration date of May 16, 2019. WBI Energy Transmission had $140.0 million of notes outstanding at December 31, 2018, which reduced the remaining capacity under this uncommitted private shelf agreement to $60.0 million. This agreement contains customary covenants and provisions, including a covenant of WBI Energy Transmission not to permit, as of the end of any fiscal quarter, the ratio of total debt to total capitalization to be greater than 55 percent. WBI Energy Transmission's total debt to total capitalization at December 31, 2018, was 40 percent. Other covenants include a limitation on priority debt and restrictions on the sale of certain assets and the making of certain investments. Long-term Debt Outstanding Long-term debt outstanding was as follows:
| Weighted Average Interest Rate at December 31, 2018 |  | December 31, 2018 |  | December 31, 2017 |
|  | (In thousands)
Senior Notes due on dates ranging from July 1, 2019 to January 15, 2055 | 4.57 | % | $ | 1,381,000 |  | $ | 1,499,916 |
Commercial paper supported by revolving credit agreements | 3.10 | % | 338,100 |  | 88,350 |
Term Loan Agreements due on dates ranging from October 17, 2019 to September 3, 2032 | 2.75 | % | 209,800 |  | — |
Credit agreements due on April 24, 2020 | 4.40 | % | 110,100 |  | 57,300 |
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 | 5.22 | % | 25,229 |  | 24,982 |
Less unamortized debt issuance costs |  | 5,207 |  | 5,694 |
Less discount |  | 327 |  | 1 |
Total long-term debt |  | 2,108,695 |  | 1,714,853 |
Less current maturities |  | 251,854 |  | 148,499 |
Net long-term debt |  | $ | 1,856,841 |  | $ | 1,566,354 |
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, 2018, were as follows:
| 2019 | 2020 | 2021 | 2022 | 2023 | Thereafter |
| (In thousands)
Long-term debt maturities | $ | 251,854 |  | $ | 125,912 |  | $ | 290,413 |  | $ | 147,314 |  | $ | 125,714 |  | $ | 1,173,022 |

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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