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Employee Benefits and Share-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - RSUs - 2009 Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Number of Shares    
Outstanding at beginning of period (in shares) 544  
Granted (Awarded) (in shares) 89  
Vested (Released) (in shares) (81)  
Forfeited (in shares) (41)  
Outstanding and unvested at end of period (in shares) 511 544
Weighted-Average Grant Date Fair Value    
Outstanding and unvested (in dollars per share) $ 66.65  
Granted (Awarded) (in dollars per share) 81.25  
Vested (Released) (in dollars per share) 56.57  
Forfeited (in dollars per share) 63.67  
Outstanding and unvested (in dollars per share) $ 71.03 $ 66.65
Weighted-Average Remaining Years    
Outstanding and unvested 1 year 6 months 1 year 7 months 6 days
Aggregate Intrinsic Value    
Outstanding and unvested $ 36,062 $ 44,492