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Share based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 21, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from exercise of stock options   $ 11,476 $ 9,144 $ 16,301
RSUs vested and non-vested units expected to vest (in shares)   920,782    
Unvested restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period following separation for accelerated vesting 2 years      
Unvested restricted stock units | Stock Option Plan Amended Restated 2007 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs, period for recognition (in years)   2 years 4 months 24 days    
RSUs vested and non-vested units expected to vest (in shares)   921,000.0 530,000.0  
Unrecognized compensation cost   $ 39,800    
Options to purchase common stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant-date fair value, options (in dollars per share)   $ 6.67 $ 10.19 $ 5.09
Aggregate intrinsic value of options exercised   $ 11,800 $ 11,900 $ 20,800
Proceeds from exercise of stock options   11,500 $ 9,100 $ 16,300
Total unrecognized compensation costs   $ 32,400    
Unrecognized compensation costs, period for recognition (in years)   2 years 6 months