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Investments in associates and joint ventures (Details 5) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Investments in associates [Line Items] |  |  |
Revenue | $ 1,167,381 | $ 1,274,378 | $ 1,068,791
Net loss from continued operations | (11,654) | 64,435 | (327,814)
Share in results | $ (1,144) | $ 13,207 | $ (365,321)

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