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Stock-based Payments and Director Fees - Schedule of Management Fees and Director Fees (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares (in shares) 65,065 51,572
Amount of expense recognized $ 766 $ 801
Management fees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares (in shares) 62,301 49,156
Amount of expense recognized $ 728 $ 763
Independent director fees    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares (in shares) 2,764 2,416
Amount of expense recognized $ 38 $ 38