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Disclosure of information on segments (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of information on segments [Line Items]      
Total liability $ 1,187,656 $ 1,269,186 $ 1,219,202
Operating Segments [Member]      
Disclosure of information on segments [Line Items]      
Total liability 5,248,748 5,315,362 5,500,328
Elimination of liabilities of equity accounted investees [Member]      
Disclosure of information on segments [Line Items]      
Total liability (4,034,896) (4,012,805) (4,087,495)
Elimination of intercompany payables [Member]      
Disclosure of information on segments [Line Items]      
Total liability (27,822) (32,769) (192,958)
Elimination of intersegment other liabilities amount [Member]      
Disclosure of information on segments [Line Items]      
Total liability $ 1,626 $ (602) $ (673)