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Stock Based Compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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) 838,698 838,698 424,341 838,698 424,341 507,536 422,928
Forfeited (in shares)       0      
Performance Share Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares) 2,018,518 2,018,518 653,365 2,018,518 653,365 842,792 0
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   81,837      
Share-based compensation expense   $ 0.6 $ 0.3   $ 0.6 $ 1.1  
Forfeited (in shares)   0 5,120 0 5,120    
Unrecognized compensation cost $ 4.2 $ 4.2 $ 2.1 $ 4.2 $ 2.1    
Unrecognized compensation cost, period for recognition       2 years 3 months 18 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      
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   13,170,000      
Shares available for grant (in shares) 9,051,591 9,051,591   9,051,591   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       828,701      
2017 Incentive Plan | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Non-vested shares (in shares) 756,861 756,861   756,861   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   3,060,958      
Share-based compensation expense   $ 0.7 0.2 $ 1.4 0.2    
Unrecognized compensation cost $ 5.9 $ 5.9 $ 2.4 $ 5.9 $ 2.4    
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       3 years      
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