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Employee benefits (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefits [Line Items]      
Benefit obligation at the beginning of the year $ 8,755 $ 8,185 $ 7,949
Service cost 0 2 2
Interest cost 319 359 387
Actuarial loss 63 556 200
Benefits paid (480) (347) (353)
Benefit obligation at the end of the year $ 8,657 $ 8,755 $ 8,185