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Share-based Payments - Narrative - RSU (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
RSU [Line Items]      
Number of common shares redeemable from each RSU (in shares) 1    
Liability settled share based awards $ 1,805 $ 4,703  
Share-based payment expense 14,699 13,950 $ 10,718
Liability for share based awards $ 4,128 2,659  
Minimum      
RSU [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period 1 year    
Maximum      
RSU [Line Items]      
Share-based compensation arrangement by share-based payment award, award vesting period 3 years    
Performance based RSU      
RSU [Line Items]      
Liability for share based awards $ 5,900 1,900  
Liability settled share based awards   4,800  
Excess of fair value at reclassification date over grant date fair value   2,900  
Current liabilities from share based payment transactions 1,800    
Liability for share based awards 4,100    
Liabilities from share based payment transactions, performance and market conditions met 1,800    
2017 performance based RSU      
RSU [Line Items]      
Share-based payment arrangement, cash settlement value     12,500
Share-based payment arrangement after tax deduction, cash used to settle award     7,200
2018 performance based RSU      
RSU [Line Items]      
Share-based payment arrangement, cash settlement value   (10,700)  
Share-based payment arrangement after tax deduction, cash used to settle award   6,400  
Performance, market and service based RSU      
RSU [Line Items]      
Share-based payment expense 1,600 1,500 $ 5,700
Expense in respect of RSU liability award $ 1,100 $ 600