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Debt
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Debt Debt
Certain debt instruments of the Company's subsidiaries contain restrictive and financial covenants and cross-default provisions. In order to borrow under the debt agreements, the subsidiary companies must be in compliance with the applicable covenants and certain other conditions, all of which the subsidiaries, as applicable, were in compliance with at September 30, 2020. In the event the Company's subsidiaries do not comply with the applicable covenants and other conditions, alternative sources of funding may need to be pursued.
Montana-Dakota'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, Montana-Dakota and Centennial do not issue commercial paper in an aggregate amount exceeding the available capacity under the 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 certain operations of the Company's subsidiaries. Due to the early impacts of the COVID-19 pandemic on the short-term capital markets, the Company temporarily borrowed under its revolving credit agreements in addition to accessing the commercial paper markets in the first half of 2020. At September 30, 2020, all borrowings under the revolving credit agreements for Montana-Dakota and Centennial had been repaid.
Long-term debt
Long-term Debt Outstanding Long-term debt outstanding was as follows:
 Weighted
Average
Interest
Rate at
September 30, 2020		September 30, 2020September 30, 2019December 31, 2019
 (In thousands)
Senior Notes due on dates ranging from October 22, 2022 to June 15, 2060
4.43 %$1,900,000 $1,655,000 $1,850,000 
Commercial paper supported by revolving credit agreements0.44 %214,150 281,800 222,900 
Term Loan Agreement due on September 3, 20322.00 %8,400 209,100 9,100 
Credit agreements due on June 7, 20242.40 %91,000 31,000 89,050 
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029
7.32 %35,000 50,000 50,000 
Other notes due on dates ranging from July 15, 2021 to November 30, 2038
4.60 %28,284 26,083 29,117 
Less unamortized debt issuance costs6,526 6,074 7,010 
Less discount18 153 50 
Total long-term debt2,270,290 2,246,756 2,243,107 
Less current maturities1,558 65,810 16,540 
Net long-term debt$2,268,732 $2,180,946 $2,226,567 
Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at September 30, 2020, were as follows:
Remainder of
2020		2021202220232024Thereafter
(In thousands)
Long-term debt maturities$28 $1,528 $148,038 $77,921 $366,571 $1,682,748