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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized in the accumulated other comprehensive loss consist of:    
Net amount recognized $ 5,111 $ 4,919
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Liabilities 5,049 5,030
Amounts recognized in the accumulated other comprehensive loss consist of:    
Net actuarial loss (gain) (7,863) (7,567)
Deferred taxes 2,752 2,648
Net amount recognized $ (5,111) $ (4,919)