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Disclosure of information on segments (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of information on segments [Line Items]      
Assets $ 4,332,813 $ 4,266,415 $ 4,547,181
Operating segments [member]      
Disclosure of information on segments [Line Items]      
Assets 15,614,979 15,522,247 17,303,094
Elimination of assets of equity accounted investees [Member]      
Disclosure of information on segments [Line Items]      
Assets (10,090,873) (10,016,003) (8,128,519)
Elimination of equity pick up investments of the subsidiaries and associates of the Parent company [Member]      
Disclosure of information on segments [Line Items]      
Assets (1,186,783) (1,047,758) (4,486,717)
Elimination of intercompany receivables [Member]      
Disclosure of information on segments [Line Items]      
Assets (32,769) (192,958) (138,703)
Elimination of intersegment other assets amount [Member]      
Disclosure of information on segments [Line Items]      
Assets $ 28,259 $ 887 $ (1,974)