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Disclosure of information on segments (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of information on segments [Line Items] |  |  |
Assets | $ 4,217,221 | $ 4,332,813 | $ 4,266,415
Operating Segments [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Assets | 15,369,524 | 15,614,979 | 15,522,247
Elimination of assets of equity accounted investees [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Assets | (9,963,853) | (10,090,873) | (10,016,003)
Elimination of equity pick up investments of the subsidiaries and associates of the Parent company [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Assets | (1,184,240) | (1,186,783) | (1,047,758)
Elimination of intercompany receivables [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Assets | (32,444) | (32,769) | (192,958)
Elimination of intersegment other assets amount [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Assets | $ 28,234 | $ 28,259 | $ 887

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