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Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Jul. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Line Items] |  |  |  |  |
Common shares issued through public offering and direct share purchase plan during period (in shares) |  |  | 577,823 | 2,266,191 | 2,600,795
Proceeds from issuance of common shares |  |  | $ 12,186,000 | $ 19,382,000 | $ 23,563,000
Shares issued, net of forfeitures (in shares) |  |  | 1,084,835 | 860,730 | 37,678
OP unit equivalent in common shares (in unit per share) |  |  | 1.13 |  |
OP units, redemptions |  |  | $ 0 | $ 0 | $ 1,962,000
Shares issued for units redeemed (in shares) |  |  | 48,549 | 32,780 | 29,086
Partners' capital account, exchanges and conversions |  |  | $ 210,000 | $ 165,000 | $ 148,000
OP units outstanding (in units) |  |  | 3,350,000 |  |
Payments to acquire interest in joint venture |  |  | $ 0 | $ 4,022,000 | $ 2,100,000
Joint Venture [Member] | Philadelphia, Pennsylvania [Member] | Office Building [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Payments to acquire interest in joint venture | $ 4,022,000 | $ 2,100,000 |  |  |
Real state, ownership percentage | 100.00% |  |  |  |
Former LCIF II Partners [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
OP units redeemed (in units) |  |  |  |  | 170,193
OP units, redemptions |  |  |  |  | $ 1,962,000
Common Stock [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Number of shares authorized to be repurchased (in shares) | 10,000,000 |  |  |  |
Repurchase of common shares (in shares) |  |  | 1,184,113 | 2,216,799 |
Average cost per share (usd per share) |  |  | $ 7.56 | $ 8.29 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Effect net of tax |  |  | $ (1,033,000) | $ (1,939,000) |
Series C [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Preferred shares outstanding (in shares) |  |  | 1,935,400 | 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 | $ 25,813,000
At The Market [Member] |  |  |  |  |
Equity [Line Items] |  |  |  |  |
Common shares issued through public offering and direct share purchase plan during period (in shares) |  |  | 976,109 | 0 | 0
Value authorized |  |  | $ 125,000,000 |  |
Value, new issues |  |  | $ 10,498,000 |  |

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