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Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Line Items] |  |  |  |
Common shares issued through public offering and direct share purchase plan during period (in shares) |  | 0 | 577,823 | 2,266,191
Proceeds from issuance of common shares |  | $ 16,804,000 | $ 12,186,000 | $ 19,382,000
Preferred shares outstanding (in shares) |  | 1,935,400 | 1,935,400 |
Shares issued, net of forfeitures (in shares) |  | 835,234 | 1,084,835 | 860,730
OP unit equivalent in common shares (in unit per share) |  | 1.13 |  |
Shares issued for units redeemed (in shares) |  | 140,746 | 48,549 | 32,780
Partners' capital account, exchanges and conversions |  | $ 584,000 | $ 210,000 | $ 165,000
OP units outstanding (in units) |  | 3,223,000 |  |
Payments to acquire interest in joint venture |  | $ 7,951,000 | $ 0 | 4,022,000
Joint Venture [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Payments to acquire interest in joint venture |  | $ 5,831,000 |  |
Philadelphia, Pennsylvania [Member] | Office Building [Member] | Joint Venture [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Payments to acquire interest in joint venture | $ 4,022,000 |  |  |
Real state, ownership percentage | 100.00% |  |  |
Common Shares [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Number of shares authorized to be repurchased (in shares) | 10,000,000 |  |  |
Repurchase of common shares (in shares) |  | 0 | 1,184,113 |
Average cost per share (usd per share) |  |  | $ 7.56 |
Series C [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Preferred shares outstanding (in shares) |  | 1,935,400 |  |
Dividend rate (usd per share) |  | $ 3.25 |  |
Preferred shares, liquidation preference |  | $ 96,770,000 |  |
Preferred shares to common shares conversion ratio |  | 2.4339 |  |
Series C [Member] | Minimum [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Common share closing price percent of conversion price |  | 125.00% |  |
Public Offering And Direct Share Purchase Plan Proceeds [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Proceeds from issuance of common shares |  |  | $ 4,115,000 | $ 20,797,000
At The Market [Member] |  |  |  |
Equity [Line Items] |  |  |  |
Common shares issued through public offering and direct share purchase plan during period (in shares) |  | 1,593,603 | 976,109 | 0
Value authorized |  | $ 125,000,000 |  |
Value, new issues |  | $ 17,362,000 | $ 10,498,000 |

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- Definition Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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