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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the accumulated other comprehensive loss consist of:    
Net amount recognized $ 5,197 $ 5,702
Pension Benefits    
Defined Benefit Plan Disclosure    
Liabilities 561 1,419
Amounts recognized in the accumulated other comprehensive loss consist of:    
Net actuarial gain (6,579) (7,218)
Deferred taxes 1,382 1,516
Net amount recognized $ (5,197) $ (5,702)