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Share based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from exercise of stock options   $ 9,144 $ 16,301 $ 3,036
RSUs vested and non-vested units expected to vest (in shares)   530,035    
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)   $ 10.19 $ 5.09 $ 5.28
Aggregate intrinsic value of options exercised (in dollars)   $ 11,900 $ 20,800 $ 2,600
Proceeds from exercise of stock options   9,100 $ 16,300 $ 3,000
Total unrecognized compensation costs   $ 33,300    
Unrecognized compensation costs, period for recognition (in years)   2 years 5 months    
Market Performance Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)   3 years    
Market Performance Based Restricted Stock Units | Stock Option Plan Amended Restated 2007 Equity Incentive Plan | Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)   3 years    
Market Performance Based Restricted Stock Units | Stock Option Plan Amended Restated 2007 Equity Incentive Plan | Executive Officer | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights   200.00%    
Market Performance Based Restricted Stock Units | Stock Option Plan Amended Restated 2007 Equity Incentive Plan | Executive Officer | Cliff Vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)   3 years    
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 5 months 19 days    
RSUs vested and non-vested units expected to vest (in shares)   530,000 318,200  
Unrecognized compensation cost   $ 25,800