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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |
Proceeds from issuance of common shares | $ | $ (2,818) | $ 16,848 |
Authorized amount (in shares) |  |  | 10,000,000
Treasury stock acquired (in shares) | 1,871,655 | 0 |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 8.01 |  |
OP unit equivalent in common shares | 1.13 |  |
Partners' capital account (in units) | 3,206,000 |  |
Unsettled repurchases | $ | $ 2,364 |  |
Stock Compensation Plan [Member] |  |  |
Equity [Line Items] |  |  |
Shares granted (in shares) | 57,055 | 44,238 |
Grant date fair value | $ | $ 518 | $ 463 |
At The Market [Member] |  |  |
Equity [Line Items] |  |  |
Common shares issued during period (in shares) |  | 1,593,603 |
Proceeds from issuance of common shares | $ |  | $ 17,362 |

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