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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
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