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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) shares | Dec. 31, 2015 USD ($) | Jul. 31, 2015 shares
Equity [Line Items] |  |  |  |
Proceeds from issuance of common shares | $ | $ 3,751 | $ 6,582 |  |
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 | $ | $ (6,564) |  | $ (1,939) |
OP unit equivalent in common shares | 1.13 |  |  |
Partners' capital account, units | 3,393,000 |  |  |
Direct Share Purchase Plan [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Common shares issued during period | 577,823 | 627,247 |  |
Proceeds from issuance of common shares | $ | $ 4,115 | $ 6,685 |  |

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