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Employee benefit plans - Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Employee benefit plans    
Service cost $ 166 $ 174
Interest cost (223) (233)
Amortization of unrecognized net loss 52 50
Net periodic pension cost $ (5) $ (9)