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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)

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