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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
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