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Commitments and contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments payable under cancellable operating lease | $ 18,155 | $ 19,984 | $ 22,914
Within 1 year |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments payable under cancellable operating lease | 2,006 | 1,984 | 2,055
After 1 year but not more than 5 years |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments payable under cancellable operating lease | 7,335 | 7,362 | 6,731
More than 5 years |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Minimum lease payments payable under cancellable operating lease | $ 8,814 | $ 10,638 | $ 14,128

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