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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Number of Options        
Outstanding, beginning balance (in shares)     2,411,000  
Granted (in shares)     1,070,000  
Exercised (in shares) (78,028) (242,723) (91,589) (1,686,408)
Forfeitures (in shares)     (39,000)  
Expired (in shares)     0  
Outstanding, ending balance (in shares) 3,350,000   3,350,000  
Number of options, expected to vest (in shares) 1,313,000   1,313,000  
Number of options, exercisable (in shares) 1,608,000   1,608,000  
Weighted Average Exercise Price        
Outstanding, beginning balance (in dollars per share)     $ 23.43  
Granted (in dollars per share)     27.46  
Exercised (in dollars per share)     17.61  
Forfeitures (in dollars per share)     27.80  
Expired (in dollars per share)     0  
Outstanding, ending balance (in dollars per share) $ 24.84   24.84  
Weighted average exercise price, expected to vest (in dollars per share) 28.86   28.86  
Weighted average exercise price, exercisable (in dollars per share) $ 20.64   $ 20.64  
Weighted Average- Remaining Contractual Terms        
Outstanding, ending balance     7 years 8 months 23 days  
Vested and expected to vest     9 years 2 months 1 day  
Exercisable     6 years 3 months  
Aggregate Intrinsic Value        
Outstanding, ending balance $ 28,901   $ 28,901  
Vested and expected to vest 6,577   6,577  
Exercisable $ 20,229   $ 20,229