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Stock-based Payments and Director Fees - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Management fees $ 2,300,000   $ 4,600,000  
Related party expense – management fee $ 2,270,000 $ 2,143,000 $ 4,543,000 $ 3,942,000
Restricted stock | Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Percentage of shares vesting     33.33%  
2014 Director Equity Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of annual retainer received in shares     40.00%  
2014 Director Equity Plan | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual retainer amount     $ 100,000  
Long term incentive plan | Restricted stock | Initial public offering        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted stock awards issued to independent directors (in shares)     2,000  
Thetis Asset Management LLC        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Related party expense – management fee   $ 2,100,000   $ 3,900,000