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Share-Based Payments - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense     $ 9,138   $ 30,280 $ 23,414
Share-based compensation $ 15,168 $ 15,112 9,138 $ 14,275    
Additional Paid-In Capital            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation 15,168 $ 15,112 9,138 $ 14,275    
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 2,662   2,376   5,444 5,507
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 7,673   6,588   14,031 13,950
Performance awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense $ 4,833   $ 174   $ 10,805 $ 3,957