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Share-Based Payments - Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 9,138 $ 12,445 $ 23,414 $ 24,310
Stock option compensation expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 2,376 2,168 5,507 4,574
RSU compensation expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 6,762 10,277 17,907 19,736
Long-term Incentive Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 200 $ 1,300 $ 4,000 $ 2,100