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Income taxes (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |
Effective tax rate | 31.50% | 3.20% |  |
Effective income tax rate increase (decrease), amount | $ 900 |  |  |
Effective income tax rate increase (decrease), percent | 28.30% |  |  |
Decrease in valuation allowance |  |  |  | $ 15,400
Forecast |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective tax rate |  |  | 41.00% |

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