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Stock Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   1,603,766 837,123 1,603,766 837,123 837,123 507,536
Forfeited (in shares)   0 1,575 0 1,575    
Unrecognized compensation cost   $ 6.9 $ 3.6 $ 6.9 $ 3.6    
Unrecognized compensation cost, period for recognition       2 years 1 month 6 days      
Fair value of vested shares       $ 1.8 $ 1.3    
Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   2,902,014 2,018,518 2,902,014 2,018,518 2,018,518 842,792
Fair value, expected term       3 years      
Fair value, expected term for volatility rate       3 years      
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   441,746   441,746   0  
Requisite service period       3 years      
2010 Stock Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   0   0      
2017 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase the shares reserved (in shares) 7,600,000            
Maximum number of shares that may be issued (in shares)   13,170,000   13,170,000      
Shares available for grant (in shares)   5,540,536   5,540,536   9,053,166  
2017 Incentive Plan | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued (in shares)       507,821   228,750  
2017 Incentive Plan | Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued (in shares)       1,881,380      
2017 Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   1,603,766   1,603,766   755,286  
Shares available for grant (in shares)           3,060,958  
Shares issued (in shares)           827,126  
Share-based compensation expense   $ 1.0 $ 0.6 $ 2.8 $ 1.7    
2017 Incentive Plan | Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for grant (in shares)   4,798,517   4,798,517      
Share-based compensation expense   $ 1.3 $ 0.7 $ 3.7 $ 2.1    
Unrecognized compensation cost   $ 7.0   $ 7.0   $ 5.2  
Unrecognized compensation cost, period for recognition   1 year 10 months 24 days          
Award vesting period       3 years      
2017 Incentive Plan | Performance Share Awards | Relative TSR performance Is Less Than The Thirtieth Percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage       0.00%      
2017 Incentive Plan | Performance Share Awards | Relative TSR Performance Is Equal To The Fiftieth Percentile              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights, percentage       100.00%      
2017 Incentive Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for grant (in shares)   441,746   441,746      
Share-based compensation expense   $ 0.2   $ 0.7      
Unrecognized compensation cost   $ 2.1   $ 2.1      
Unrecognized compensation cost, period for recognition   2 years 3 months 18 days