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Employee benefits (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee benefits [Abstract]      
Service cost or benefits received during the year $ 0 $ 0 $ 2
Interest cost in benefit obligation 336 319 359
Actual return in plan assets 741 133 1,694
Amortization of prior year losses 242 160 219
Net gain during the year (854) (568) 599
Net periodic pension expense $ (33) $ (159) $ 41