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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |
Proceeds from issuance of common shares | $ | $ (2,917) | $ 16,168 |
Authorized amount (in shares) |  |  | 10,000,000
Treasury stock acquired (in shares) | 795,775 | 0 |
Treasury stock acquired, average cost (in dollars per share) | $ / shares | $ 7.94 |  |
OP unit equivalent in common shares | 1.13 |  |
Partners' capital account (in units) | 3,223,000 |  |
Stock Compensation Plan [Member] |  |  |
Equity [Line Items] |  |  |
Shares granted (in shares) | 35,581 | 30,070 |
Grant date fair value | $ | $ 337 | $ 318 |
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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- Definition The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(b)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.16(a)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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