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Stockholders' Equity - Restricted Stock Unit Activity (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units        
Beginning balance (shares) 2,950 3,049 2,690  
Awarded (shares) 3,066 2,530 1,979  
Released (shares) (1,596) (1,906) (1,197)  
Forfeited (shares) (688) (723) (423)  
Ending balance (shares) 3,732 2,950 3,049  
Expected to vest (shares) 2,246      
Weighted Average Grant Date Fair Value (Per Share)        
Beginning balance (in dollars per share) $ 27.00 $ 24.73 $ 15.81  
Awarded (in dollars per share)   26.51 30.99  
Released (in dollars per share)   23.40 14.24  
Forfeited (in dollars per share)   25.19 20.28  
End balance (in dollars per share) 43.63 $ 27.00 $ 24.73  
Expected to vest (in dollars per share) $ 41.86      
Aggregate Fair Value        
Non-vested and outstanding $ 133,308 $ 183,781 $ 112,848 $ 50,756
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Fair Value, Expected To Vest $ 80,242