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Disclosure of information on segments (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | $ 74,533 | $ (308,741) | $ (355,312)
Operating segments [member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | 250,134 | (1,397,473) | (1,006,367)
Elimination of profit of equity accounted investees [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | (225,215) | 645,989 | 203,912
Elimination of intercompany sales [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | (108,973) | (251,502) | (232,380)
Elimination of intercompany cost of sales [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | 106,726 | 250,157 | 228,914
Elimination of share in the results of subsidiaries and associates [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | 49,627 | 448,507 | 448,691
Elimination of intersegment other income expense amount [Member] |  |  |
Disclosure of information on segments [Line Items] |  |  |
Profit (loss) from continued operations | $ 2,234 | $ (4,419) | $ 1,918

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