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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.

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