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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) $ / shares shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |
Proceeds from issuance of common shares | $ | $ 16,168 | $ 3,751 |
Authorized amount (in shares) |  |  | 10,000,000
Treasury stock acquired (in shares) | 0 | 1,184,113 |
Treasury stock acquired, average cost (in dollars per share) | $ / shares |  | $ 7.56 |
OP unit equivalent in common shares | 1.13 |  |
Partners' capital account (in units) | 3,350,000 |  |
Performance Shares [Member] |  |  |
Equity [Line Items] |  |  |
Common shares issued during period (in shares) | 326,929 |  |
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 |  |
Direct Share Purchase Plan [Member] |  |  |
Equity [Line Items] |  |  |
Common shares issued during period (in shares) |  | 577,823 |
Proceeds from issuance of common stock, net | $ |  | $ 4,115 |

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