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Long-term debt outstanding (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,379,806 $ 2,108,695  
Long-term debt due within one year 51,822 251,854 $ 109,199
Long-term debt $ 2,327,984 1,856,841 $ 1,743,711
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.52%    
Long-term debt $ 1,656,000 1,381,000  
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.77%    
Long-term debt $ 433,350 338,100  
Term Loan Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.75%    
Long-term debt $ 209,800 209,800  
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 5.50%    
Long-term debt $ 11,075 110,100  
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 $ 26,105 25,229  
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,164 5,207  
Discount $ 360 $ 327