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Share-based payments (Compensation Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total compensation costs related to share based payments $ 10,218 $ 6,355 $ 16,549 $ 8,761
Selling, General and Administrative Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock option compensation expense 1,909 1,543 3,770 2,730
Equity-classified share units 4,404 3,231 7,557 5,017
Liability-classified share units 526 971 (1,389) (185)
Employee share purchase plan - employer contributions 701 610 1,380 1,199
Total compensation costs related to share based payments 7,540 $ 6,355 11,318 $ 8,761
Acquisition-related Costs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Share based continuing employment costs 2,678   5,231  
Total compensation costs related to share based payments $ 2,678   $ 5,231