v3.8.0.1

Income tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Tax [Abstract] |  |
Income tax expense (benefit) | $ 4,650 | $ (4,500)
Income (loss) before income tax | $ 3,140 | $ (18,907)

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