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Intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning Balance $ 1,427 $ 1,633  
Ending Balance 1,984 1,427 $ 1,633
Cost [member]      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning Balance 14,401 13,905 17,172
Additions 1,311 496 58
Disposals (1)   (3,315)
Reclassifications     (10)
Ending Balance 15,711 14,401 13,905
Accumulated amortization [member]      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Beginning Balance 12,974 12,272 11,747
Amortization 753 702 1,176
Disposals     (609)
Reclassifications     (42)
Ending Balance $ 13,727 $ 12,974 $ 12,272