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Stock-based Payments and Director Fees - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 01, 2019
Apr. 01, 2019
Jul. 31, 2018
Jul. 24, 2017
Aug. 17, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Management fees           $ 6,700    
Incentive Fee Expense           700 $ 100 $ 0
Amount of expense recognized           $ 2,758 $ 2,963 $ 2,485
Number of shares (in shares)           195,629 210,033 160,360
Annual retainer amount           $ 75    
Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted           308,334 233,834 198,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           79,000 48,500 39,000
Restricted stock | Employee And Service Provider Grants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted           144,667 146,334 149,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           0 0 0
Restricted stock | Employee And Service Provider Grants Second Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted           38,667 39,000 39,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           0 0 39,000
Restricted stock | Employee And Service Provider Grants Third Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted     36,500     34,000 36,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           0 36,500  
Restricted stock | Employees                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of restricted stock awards issued to independent directors (in shares) 79,000     39,000        
Vesting period           3 years    
Restricted stock | Employees | Employee And Service Provider Grants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of restricted stock awards issued to independent directors (in shares)         153,000      
Restricted stock | Director                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             3,000  
Vesting period             1 year  
Long term incentive plan | Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares forfeited (in shares)           333 2,666  
Long term incentive plan | Restricted stock | Employee And Service Provider Grants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares forfeited (in shares)           1,667   4,000
Long term incentive plan | Restricted stock | Employee And Service Provider Grants Third Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares forfeited (in shares)           2,500    
Long term incentive plan | Initial public offering | Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of restricted stock awards issued to independent directors (in shares)           2,000    
Vesting period           1 year    
Director Equity Plan 2014 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual retainer, shares   40.00%       50.00%    
Vesting period           1 year    
Management fee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Payment Arrangement, Expense           $ 2,500    
Amount of expense recognized           $ 2,600 $ 2,813 $ 2,335
Number of shares (in shares)           184,681 200,405 150,652
Common Stock | Management fee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares (in shares)           175,211    
Common Stock | Incentive fees                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Amount of expense recognized           $ 100    
Number of shares (in shares)           9,470