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Equity - Additional Information (Details) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($) $ / shares shares | Jul. 31, 2015 shares
Equity [Line Items] |  |  |
Proceeds from issuance of common shares | $ | $ 16,848 | $ 3,466 |
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) | 3,245,000 |  |
Stock Compensation Plan [Member] |  |  |
Equity [Line Items] |  |  |
Shares granted (in shares) | 36,136 | 35,147 |
Grant date fair value | $ | $ 382 | $ 273 |
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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- 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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