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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeited (in shares)         5,120    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   837,123 507,536 837,123 507,536 507,536 422,928
Forfeited (in shares)       1,575      
Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   2,018,518 842,792 2,018,518 842,792 842,792 0
Fair value, expected term       3 years      
2017 Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase the shares reserved 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   9,053,166   3,865,174  
2017 Incentive Plan | Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares Issued       228,750   131,975  
2017 Incentive Plan | Employee              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares Issued       827,126      
2017 Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   755,286   755,286   290,373  
Shares available for grant (in shares)           1,280,392  
2017 Incentive Plan | Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for grant (in shares)   3,060,958   3,060,958      
Share-based compensation expense   $ 0.7 $ 0.3 $ 2.1 $ 0.6    
Unrecognized compensation cost   $ 5.2 3.0 $ 5.2 3.0    
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 | Employee Stock Option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares Issued           292,459  
2010 Stock Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares)   81,837   81,837      
Share-based compensation expense   $ 0.6 $ 0.3   $ 1.0 $ 1.7  
Forfeited (in shares)   1,575 5,120 1,575,000 5,120    
Unrecognized compensation cost   $ 3.6 $ 2.3 $ 3.6 $ 2.3    
Unrecognized compensation cost, period for recognition       2 years 1 month 6 days      
Fair value of vested shares       $ 1.3 $ 1.1    
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