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Pension benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Amortization of transition obligation $ 40 $ 39 $ 112
Actuarial gain (loss) 986 574 (185)
Totals (1,026) (613) $ 73
Amounts in accumulated other comprehensive income (loss) not yet reflected in net periodic pension cost, net of taxes:      
Actuarial gain 1,737 751  
Transition obligation (213) (253)  
Totals 1,524 $ 498  
Amounts in accumulated other comprehensive loss expected to be amortized in 2016 net periodic pension cost, net of taxes:      
Actuarial gain (370)    
Transition obligation 41    
Totals $ (329)