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Long-term debt outstanding (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Long term debt outstanding [Abstract]    
Long-term debt $ 1,790,159 $ 1,796,163
Long-term debt due within one year 43,598 238,539
Long-term debt $ 1,746,561 1,557,624
Senior notes [Member]    
Debt instrument [Line Items]    
Weighted average interest rate 4.87%  
Long term debt outstanding [Abstract]    
Long-term debt $ 1,437,831 1,616,246
Commercial paper [Member]    
Debt instrument [Line Items]    
Weighted average interest rate 1.27%  
Long term debt outstanding [Abstract]    
Long-term debt $ 262,000 62,500
Medium-term notes [Member]    
Debt instrument [Line Items]    
Weighted average interest rate 6.68%  
Long term debt outstanding [Abstract]    
Long-term debt $ 50,000 50,000
Other notes [Member]    
Debt instrument [Line Items]    
Weighted average interest rate 5.25%  
Long term debt outstanding [Abstract]    
Long-term debt $ 24,471 24,589
Credit agreements [Member]    
Debt instrument [Line Items]    
Weighted average interest rate 3.14%  
Long term debt outstanding [Abstract]    
Long-term debt $ 21,793 48,906
Long-term debt [Member]    
Long term debt outstanding [Abstract]    
Unamortized debt issuance costs (5,832) (6,069)
Discount $ (104) $ (9)