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Debt (Tables)
 9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
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