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Long-term debt outstanding (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,281,876 $ 2,243,107 $ 2,379,806
Long-term debt due within one year 16,560 16,540 51,822
Long-term debt $ 2,265,316 2,226,567 2,327,984
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.43%    
Long-term debt $ 1,900,000 1,850,000 1,656,000
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 1.02%    
Long-term debt $ 290,100 222,900 433,350
Term Loan Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.00%    
Long-term debt $ 9,100 9,100 209,800
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 3.25%    
Long-term debt $ 11,200 89,050 11,075
Medium-term Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 6.68%    
Long-term debt $ 50,000 50,000 50,000
Other Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.59%    
Long-term debt $ 28,342 29,117 26,105
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,668 7,010 6,164
Discount $ 198 $ 50 $ 360