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Income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss before income taxes |  |  |
Dutch operations | $ (51,107) | $ (63,304) | $ (41,063)
Loss before income tax benefit / (expense) | (72,229) | (83,262) | (50,312)
Current benefit / (expense) |  |  |
Dutch operations | 0 | 0 | 0
Deferred benefit / (expense) |  |  |
Dutch operations | (1,094) | 714 | 535
Income tax benefit / (expense) | (1,145) | 1,179 | 535
U.S. operations |  |  |
Loss before income taxes |  |  |
Loss before income tax benefit / (expense) | (21,221) | (20,406) | (8,937)
Foreign operations |  |  |
Loss before income taxes |  |  |
Loss before income tax benefit / (expense) | 99 | 448 | $ (312)
Current benefit / (expense) |  |  |
Current benefit / (expense) | $ (51) | (51) |
Deferred benefit / (expense) |  |  |
Deferred benefit / (expense) |  | $ 516 |

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