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Other operating income, other operating expenses, restructuring income and expenses, financial result - Schedule of financial results (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Analysis of income and expense [abstract] |  |  |  |
Interest expense on term loans |  |  | $ (11,395) | $ (12,479)
Amortization of transaction costs | $ (1,700) |  | (2,119) | (2,437)
Commitment bank charge |  |  | (865) | (612)
Interest income |  |  | 2,776 | 807
Interest on non-current provisions |  |  | (1,051) | (920)
Other interest expense, net |  |  | (2,110) | (2,796)
Total net interest expenses |  |  | (14,764) | (18,437)
Gains from foreign currency revaluation |  |  | 17,202 | 19,276
Losses from foreign currency revaluation |  |  | (19,869) | (22,111)
Net foreign currency revaluation impact |  |  | (2,667) | (2,835)
Bank guarantee expense |  |  | (11) | 0
Share of profit or loss of joint ventures | $ 144 | $ 133 | 293 | 262
Financial Result |  |  | $ (17,149) | $ (21,010)

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