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Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 4 Months Ended 9 Months Ended
Sep. 12, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 13, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock authorized   500,000,000   500,000,000 500,000,000     500,000,000
Common stock par value   $ 0.01   $ 0.01 $ 0.01     $ 0.01
Preferred stock authorized   100,000,000   100,000,000 100,000,000     100,000,000
Preferred stock par value   $ 0.01   $ 0.01 $ 0.01     $ 0.01
Common stock, shares issued   12,703,474   12,703,474 12,703,474     13,340,217
Preferred shares issued   0   0 0     0
Dividends declared (in dollars per share)   $ 0.37 $ 0.40   $ 1.11 $ 1.20    
Dividends   $ (4,700) $ (5,300)   $ (14,150) [1] $ (13,934) [1]    
Common Stock, Capital Shares Reserved for Future Issuance   327,317   327,317 327,317      
Stock Repurchase Program, Authorized Amount             1,200,000  
Repurchase of common shares, shares   (21,720) 0 (21,720) (649,887) 0    
Repurchase of common shares, Value   $ (200)   $ (200) $ (7,251)      
Stock Repurchases Average Price Per Share   $ 10.82   $ 10.82 $ 11.16      
Intended Distribution of Taxable Net Income, Percentage on Annual Basis         100.00%      
Stock Issued During Period, Shares, Restricted Stock Award, Gross   13,144 9,976   13,144 9,976    
Independent Trustees [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock Issued During Period, Shares, Restricted Stock Award, Gross 13,144              
[1] For the three-month periods ended September 30, 2018 and 2017, dividends totaling $0.37 and $0.40, respectively, per common share outstanding, were declared. For the nine-month periods ended September 30, 2018 and 2017, dividends totaling $1.11 and $1.20, respectively, per common share outstanding, were declared.