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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2020
Apr. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 5.6   $ 5.6    
Unrecognized compensation cost, recognition period     1 year 3 months 18 days    
Leavers rate per year     3.00%    
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Settlement period, following third anniversary     75 days    
Intrinsic value of PSU or RSU outstanding (in dollars per share) $ 7.46   $ 7.46 $ 18.99 $ 27.10
Intrinsic value of PSU or RSU $ 5.8   $ 5.8 $ 31.0  
Performance based adjustment (in shares)     0    
RSUs | Vesting Period One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
RSUs | Vesting Period Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
RSUs | Vesting Period Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage on each of the first, second, and third anniversary of the grant date     33.33%    
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of PSU or RSU outstanding (in dollars per share) $ 7.46   $ 7.46 $ 18.99 $ 27.10
Intrinsic value of PSU or RSU $ 5.8   $ 5.8 $ 31.0  
Performance based adjustment (in shares)     (40,087)    
PSUs | 2017 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised during period (in shares) 378,165        
Performance based adjustment (in shares) 40,087   (40,087)    
PSUs | 2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised during period (in shares)   977,106      
Performance based adjustment (in shares)   299,499      
Restricted Shares | Non-employee Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding (in shares) 24,080   24,080