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Employee benefit plans - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Employee benefit plans        
Service cost $ 166 $ 174 $ 333 $ 348
Interest cost (223) (233) (447) (466)
Amortization of unrecognized net loss 52 50 104 100
Net periodic pension cost $ (5) $ (9) $ (10) $ (18)