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Pension benefits (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation at beginning of the year $ 3,531 $ 3,652 $ 3,552
Service cost 477 491 517
Interest cost 219 222 238
Actuarial loss (gain) (1,119) (855) 115
Curtailments 0 0 (328)
Foreign currency exchange rate changes (199) 132 (359)
Benefits paid (69) (111) (83)
Projected benefit obligation at end of year $ 2,840 $ 3,531 $ 3,652