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Employee benefits (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefits [Abstract]      
Service cost or benefits received during the year $ 0 $ 2 $ 2
Interest cost in benefit obligation 319 359 387
Actual return in plan assets 133 1,694 293
Amortization of prior year losses 160 219 184
Net gain during the year (568) 599 610
Net periodic pension expense $ (159) $ 41 $ 29