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Pension benefits (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 477 $ 491 $ 517
Interest cost 219 222 238
Curtailments 0 0 (328)
Actuarial loss (gain) recognized (79) 4 92
Net periodic pension cost $ 617 $ 717 $ 519