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Long-term debt outstanding (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,246,756 $ 2,108,695  
Long-term debt due within one year 65,810 251,854 $ 3,915
Long-term debt $ 2,180,946 1,856,841 $ 1,911,555
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.52%    
Long-term debt $ 1,655,000 1,381,000  
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.46%    
Long-term debt $ 281,800 338,100  
Term Loan Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.75%    
Long-term debt $ 209,100 209,800  
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.66%    
Long-term debt $ 31,000 110,100  
Medium-term Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 6.68%    
Long-term debt $ 50,000 50,000  
Other Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 5.01%    
Long-term debt $ 26,083 25,229  
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,074 5,207  
Discount $ 153 $ 327