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Debt
 6 Months Ended
Jun. 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 June 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 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 June 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
June 30, 2020		June 30, 2020June 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  $1,656,000  $1,850,000  
Commercial paper supported by revolving credit agreements1.02 %290,100  433,350  222,900  
Term Loan Agreement due on September 3, 20322.00 %9,100  209,800  9,100  
Credit agreements due on June 7, 20243.25 %11,200  11,075  89,050  
Medium-Term Notes due on dates ranging from September 1, 2020 to March 16, 2029
6.68 %50,000  50,000  50,000  
Other notes due on dates ranging from July 15, 2021 to November 30, 2038
4.59 %28,342  26,105  29,117  
Less unamortized debt issuance costs6,668  6,164  7,010  
Less discount198  360  50  
Total long-term debt2,281,876  2,379,806  2,243,107  
Less current maturities16,560  51,822  16,540  
Net long-term debt$2,265,316  $2,327,984  $2,226,567  
Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at June 30, 2020, were as follows:
Remainder of
2020		2021202220232024Thereafter
(In thousands)
Long-term debt maturities$15,762  $1,522  $148,021  $77,921  $362,722  $1,682,794