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Share-Based Awards - Bonus Plans (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award    
Share withholding 738,233  
Taxes paid for net settlement of stock-settled bonus $ 3,182,000 $ 4,409,000
Stock-based compensation expense $ 7,573,000 $ 10,290,000
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   $ 4,100,000
Stock-based compensation expense   1,100,000
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 $ 2,900,000  
Stock-based compensation expense 757,000 $ 2,700,000
2020 Bonus Plan    
Share Based Compensation Arrangement By Share Based Payment Award    
Stock-based compensation expense $ 0