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Long-term debt outstanding (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Long-term debt outstanding [Line Items]    
Long-term debt $ 2,243,107 $ 2,108,695
Long-term debt due within one year 16,540 251,854
Long-term debt $ 2,226,567 1,856,841
Senior Notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 4.45%  
Long-term debt $ 1,850,000 1,381,000
Commercial paper    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 2.04%  
Long-term debt $ 222,900 338,100
Term Loan Agreements    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 2.00%  
Long-term debt $ 9,100 209,800
Credit Agreements    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 4.40%  
Long-term debt $ 89,050 110,100
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 4.48%  
Long-term debt $ 29,117 25,229
Long-term debt    
Long-term debt outstanding [Line Items]    
Unamortized debt issuance costs 7,010 5,207
Discount $ 50 $ 327