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Share-Based Awards - Bonus Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award            
Share withholding         815,527  
Taxes paid for net settlement of stock-settled bonus         $ 3,542 $ 4,784
Stock-based compensation expense $ 13,506   $ 8,857   21,079 19,147
2018 Bonus Plan            
Share Based Compensation Arrangement By Share Based Payment Award            
Shares granted, net of shares withheld for taxes       1,338,220    
Share withholding       832,635    
Taxes paid for net settlement of stock-settled bonus       $ 4,100    
Stock-based compensation expense           1,100
2019 Bonus Plan            
Share Based Compensation Arrangement By Share Based Payment Award            
Shares granted, net of shares withheld for taxes   1,061,165        
Share withholding   669,517        
Taxes paid for net settlement of stock-settled bonus   $ 2,900        
Stock-based compensation expense     $ 2,200   757 $ 4,900
2020 Bonus Plan            
Share Based Compensation Arrangement By Share Based Payment Award            
Stock-based compensation expense $ 5,700       $ 5,700