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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the accumulated other comprehensive loss consist of:      
Net amount recognized $ 6,302 $ 5,197  
Pension Benefits      
Defined Benefit Plan Disclosure      
Liabilities 1,485 561  
Amounts recognized in the accumulated other comprehensive loss consist of:      
Net actuarial gain (7,977) (6,579)  
Deferred taxes 1,675 1,382  
Net amount recognized (6,302) (5,197)  
Accumulated benefit obligation $ 19,113 $ 17,491 $ 16,338