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Stock Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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) 838,698 1,603,766 838,698 1,603,766 838,698 837,123 507,536
Forfeited (in shares)   0 0 0 0    
Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares) 2,018,518 2,902,014 2,018,518 2,902,014 2,018,518 2,018,518 842,792
Fair value, expected term       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      
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)           9,053,166  
2017 Incentive Plan | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares issued (in shares)       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      
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   $ 1.2 $ 0.7 $ 2.5 $ 1.4    
Unrecognized compensation cost   $ 8.2   $ 8.2   $ 5.9  
Unrecognized compensation cost, period for recognition   2 years          
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 | Performance Share Awards | Board of Directors Chairman              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value, expected term for volatility rate       3 years      
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   $ 0.5      
Unrecognized compensation cost   $ 2.3   $ 2.3      
Unrecognized compensation cost, period for recognition   2 years 6 months          
2010 Stock Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for grant (in shares)   5,819,607   5,819,607      
2010 Stock Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   0   0      
Share-based compensation expense   $ 1.0 0.6 $ 1.8 1.1    
Unrecognized compensation cost $ 4.2 $ 7.9 $ 4.2 $ 7.9 4.2    
Unrecognized compensation cost, period for recognition       2 years 3 months 18 days      
Fair value of vested shares       $ 1.8 $ 1.3    
Requisite service period       3 years      
Award vesting period       3 years      
2010 Stock Incentive Plan | Performance Share Awards | Board of Directors Chairman              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period       3 years