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Stock-based Payments and Director Fees - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Management fees $ 2,300,000   $ 6,900,000  
Related party expense – management fee $ 2,292,000 $ 2,264,000 $ 6,835,000 $ 6,206,000
Restricted stock | Employees | Granted in 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Restricted stock | Employees | Granted Prior to 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche One | Granted in 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     25.00%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche One | Granted Prior to 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     33.33%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche Two | Granted in 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     25.00%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche Two | Granted Prior to 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     33.33%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche Three | Granted in 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     25.00%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche Three | Granted Prior to 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     33.33%  
Restricted stock | Employees | Share-based Payment Arrangement, Tranche Four | Granted in 2021        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vesting     25.00%  
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   $ 2,300,000   $ 6,200,000