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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 24, 2016
May 22, 2007
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 12, 2020
May 15, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock authorized to be issued under plan (in shares) 8,900,000            
Total intrinsic value of options exercised during period     $ 15,500 $ 8,100 $ 5,400    
Cash received from options exercised during period     21,418 $ 12,625 $ 4,987    
Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized pre-tax compensation cost     $ 20,800        
Weighted average recognition period (in years)     2 years 11 months 15 days        
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized pre-tax compensation cost     $ 4,700        
Weighted average recognition period (in years)     2 years 8 months 12 days        
2007 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock authorized to be issued under plan (in shares) 400,000 3,300,000          
Award vesting period   5 years          
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%          
2016 Long-Term Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock authorized to be issued under plan (in shares) 3,400,000         2,500,000 2,600,000
Exercise price of shares granted may not be less than fair market value (percentage) 100.00%