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Employee benefits (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee benefits [Line Items]      
Fair value of plan assets at the beginning of the year $ 8,751 $ 7,404 $ 7,464
Actual return (loss) in plan assets 133 1,694 293
Benefits paid (480) (347) (353)
Fair value of plan assets at the end of the year 8,404 8,751 7,404
Financing status (253) (4) (781)
Net actuarial loss at the beginning of the year (2,614) (3,432) (3,165)
Amortization during the year 160 219 184
Net estimated gain or loss occurred during the year (568) 599 (451)
Adjustment to recognize the minimum pension obligation $ (3,022) $ (2,614) $ (3,432)