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Disclosure of information on segments (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of information on segments [Line Items]      
Total liability $ 1,269,186 $ 1,219,202 $ 1,157,945
Operating segments [member]      
Disclosure of information on segments [Line Items]      
Total liability 5,315,362 5,500,328 5,451,667
Elimination of liabilities of equity accounted investees [Member]      
Disclosure of information on segments [Line Items]      
Total liability (4,012,805) (4,087,495) (4,154,042)
Elimination of intercompany payables [Member]      
Disclosure of information on segments [Line Items]      
Total liability (32,769) (192,958) (138,703)
Elimination of intersegment other liabilities amount [Member]      
Disclosure of information on segments [Line Items]      
Total liability $ (602) $ (673) $ (977)