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Stock-Based Compensation - Movement of PSUs and RSUs (Details) - $ / shares
1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   1,594,990 1,610,894 1,145,238
Granted (in shares)   332,891 450,977 474,660
Performance based adjustment (in shares)   299,499 110,215 0
Settled (in shares)   (977,106) (557,337) 0
Forfeited (in shares)   (246,529) (19,759) (9,004)
Outstanding, end of period (in shares)   1,003,745 1,594,990 1,610,894
Expected to vest (in shares)   917,255 1,556,011 1,433,440
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   35,817 0 0
Granted (in shares)   219,197 35,817 0
Performance based adjustment (in shares)   0 0 0
Settled (in shares)   (11,939) 0 0
Forfeited (in shares)   (45,493) 0 0
Outstanding, end of period (in shares)   197,582 35,817 0
Expected to vest (in shares)   197,582 35,817 0
2016 Plan | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   677,607    
Granted (in shares)   0    
Performance based adjustment (in shares)   299,499    
Forfeited (in shares)   0    
Outstanding, end of period (in shares)   0 677,607  
Expected to vest (in shares)   0    
Weighted Average grant Date fair value (in USD per share)   $ 17.21    
2017 Plan | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   467,349    
Granted (in shares)   0    
Performance based adjustment (in shares)   0    
Settled (in shares)   0    
Forfeited (in shares)   (49,097)    
Outstanding, end of period (in shares)   418,252 467,349  
Expected to vest (in shares)   401,904    
Weighted Average grant Date fair value (in USD per share)   $ 24.89    
2018 Plan | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   450,034    
Granted (in shares)   0    
Performance based adjustment (in shares)   0    
Settled (in shares)   0    
Forfeited (in shares)   (94,268)    
Outstanding, end of period (in shares)   355,766 450,034  
Expected to vest (in shares)   299,418    
Weighted Average grant Date fair value (in USD per share)   $ 39.24    
2018 Plan | RSUs | Employees, Sign On        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   35,817    
Granted (in shares)   0    
Performance based adjustment (in shares)   0    
Settled (in shares)   (11,939)    
Forfeited (in shares)   0    
Outstanding, end of period (in shares)   23,878 35,817  
Expected to vest (in shares)   23,878    
Weighted Average grant Date fair value (in USD per share)   $ 25.81    
2019 Plan | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   0    
Granted (in shares)   332,891    
Performance based adjustment (in shares)   0    
Settled (in shares)   0    
Forfeited (in shares)   (103,164)    
Outstanding, end of period (in shares)   229,727 0  
Expected to vest (in shares)   215,933    
Weighted Average grant Date fair value (in USD per share)   $ 11.48    
2019 Plan | RSUs | Employees, Sign On        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   0    
Granted (in shares)   45,257    
Performance based adjustment (in shares)   0    
Settled (in shares)   0    
Forfeited (in shares)   0    
Outstanding, end of period (in shares)   45,257 0  
Expected to vest (in shares)   45,257    
Weighted Average grant Date fair value (in USD per share)   $ 15.89    
2019 Plan | RSUs | Employees, Existing        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Outstanding, beginning of period (in shares)   0    
Granted (in shares)   173,940    
Performance based adjustment (in shares)   0    
Settled (in shares)   0    
Forfeited (in shares)   (45,493)    
Outstanding, end of period (in shares)   128,447 0  
Expected to vest (in shares)   128,447    
Weighted Average grant Date fair value (in USD per share)   $ 14.74    
2015 Plan | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Performance based adjustment (in shares) 110,215