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Share-based Payments - Restricted Share Units Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payments   $ 15,361 $ 11,619 $ 8,151
Restricted share units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Accelerated and vested (in shares) 732,972      
Share-based payments   $ 8,176 $ 889  
Granted (in shares)   957,854 732,972 0