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Debt
 3 Months Ended
Mar. 31, 2021
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 March 31, 2021. In the event the 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.
Long-term debt
Long-term Debt Outstanding Long-term debt outstanding was as follows:
 
Weighted
Average
Interest
Rate at
March 31, 2021
March 31, 2021March 31, 2020December 31, 2020
 (In thousands)
Senior Notes due on dates ranging from October 22, 2022 to October 30, 2060
4.40 %$1,950,000 $1,850,000 $1,950,000 
Commercial paper supported by revolving credit agreements.33 %218,900 265,000 125,600 
Credit agreements due on June 7, 20242.20 %43,350 259,550 95,900 
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029
7.32 %35,000 50,000 35,000 
Term Loan Agreement due on September 3, 20322.00 %8,400 9,100 8,400 
Other notes due on dates ranging from July 15, 2021 to July 1, 2061
.82 %3,282 28,374 4,034 
Less unamortized debt issuance costs5,655 6,640 5,803 
Less discount3 149 1 
Total long-term debt2,253,274 2,455,235 2,213,130 
Less current maturities1,552 16,560 1,555 
Net long-term debt$2,251,722 $2,438,675 $2,211,575 
Schedule of Debt Maturities Long-term debt maturities, which excludes unamortized debt issuance costs and discount, at March 31, 2021, were as follows:
Remainder of
2021		2022202320242025Thereafter
(In thousands)
Long-term debt maturities$780 $148,021 $77,921 $323,672 $177,802 $1,530,736