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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 17, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Aug. 02, 2016
Nov. 04, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Aggregate purchase price for repurchased shares       $ 0 $ 53,035,000    
The 2016 Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Value of shares authorized for repurchase under stock repurchase programs (up to)           $ 50,000,000  
2014 Share Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Value of shares authorized for repurchase under stock repurchase programs (up to)             $ 50,000,000
2016 and 2014 Share Repurchase Programs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Remaining value of shares authorized for repurchase under stock repurchase programs   $ 54,900,000   $ 54,900,000      
Number of shares repurchased (in shares)   0 0 0 0    
One-Time Stock Repurchase Transaction              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Value of shares authorized for repurchase under stock repurchase programs (up to) $ 75,000,000            
Number of shares repurchased (in shares) 749,300            
Average price of repurchased shares (in dollars per share) $ 70.78            
Aggregate purchase price for repurchased shares $ 53,000,000            
1997 Plan | ESPP shares available for future issuance              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares purchased under ESPP (in shares)       287,000 333,000    
Weighted-average price of shares purchased (in dollars per share)       $ 62.14 $ 48.77    
Unrecognized compensation cost   $ 3,100,000   $ 3,100,000      
Weighted average period of compensation cost not yet recognized       1 year 6 months      
2009 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options granted (in shares)   0   150,000      
Weighted-average fair value of options granted (in dollars per share)     $ 23.75 $ 33.89 $ 25.30    
Intrinsic value of options exercised   $ 26,000,000 $ 4,100,000 $ 56,800,000 $ 16,500,000    
Unrecognized compensation cost of unvested stock options   38,400,000   $ 38,400,000      
2009 Plan | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average period of compensation cost not yet recognized       2 years 4 months 24 days      
2009 Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average period of compensation cost not yet recognized       3 years 1 month 6 days      
Unrecognized compensation cost   73,400,000   $ 73,400,000      
2009 Plan | RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average period of compensation cost not yet recognized       8 months 12 days      
Unrecognized compensation cost   1,000,000   $ 1,000,000      
2009 Plan | PSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average period of compensation cost not yet recognized       1 year 2 months 12 days      
Unrecognized compensation cost   $ 7,000,000   $ 7,000,000