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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) shares | Dec. 31, 2015 USD ($) | Jul. 31, 2015 shares
Equity [Line Items] |  |  |  |
Proceeds from issuance of common shares | $ | $ 3,466 | $ 12,956 |  |
Authorized amount (in shares) |  |  |  | 10,000,000
Treasury stock acquired (in shares) | 1,184,113 |  |  |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 7.56 |  |  |
Gains and losses on cash flow hedges | $ | $ (7,520) |  | $ (1,939) |
OP unit equivalent in common shares | 1.13 |  |  |
Partners' capital account (in units) | 3,389,000 |  |  |
Direct Share Purchase Plan [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Common shares issued during period (in shares) | 577,823 | 1,313,912 |  |
Proceeds from issuance of common shares | $ | $ 4,115 | $ 13,059 |  |

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