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v3.3.1.900

Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity [Line Items] |  |  |  |  |  |
Common shares issued through public offering and direct share purchase plan during period |  |  |  | 2,266,191 | 2,600,795 | 36,012,313
Proceeds from issuance of common shares |  |  |  | $ 19,382,000 | $ 23,563,000 | $ 434,927,000
Shares, net of forfeitures |  |  |  | 860,730 | 37,678 | 1,893,409
OP unit equivalent in common shares |  |  |  | 1.13 |  |
OP units, redemptions |  |  |  | $ 0 | $ 1,962,000 | $ 0
Shares issued for units redeemed |  |  |  | 32,780 | 29,086 | 202,241
Partners' capital account, exchanges and conversions |  |  |  | $ 165,000 | $ 148,000 | $ 1,053,000
OP units outstanding |  |  |  | 3,393,000 |  |
Payments to acquire interest in joint venture |  |  |  | $ 4,022,000 | $ 2,100,000 | 8,918,000
Joint Venture [Member] | Office Building [Member] | Philadelphia, Pennsylvania [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Payments to acquire interest in joint venture | $ 4,022,000 | $ 2,100,000 |  |  |  |
Real state, ownership percentage | 100.00% |  |  |  |  |
Joint Venture [Member] | Industrial Property [Member] | Long Island City, New York [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  | $ 8,918,000 |  |  |
Former LCIF II Partners [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
OP units redeemed |  |  |  |  | 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) |  |  |  | 2,216,799 |  |
Average cost per share (in dollars per share) |  |  |  | $ 8.29 |  |
Series C [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Preferred shares outstanding |  |  |  | 1,935,400 | 1,935,400 |
Dividend rate, per-dollar-amount |  |  |  | $ 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 |  |  |  | $ 20,797,000 | $ 25,813,000 | $ 399,566,000
At The Market [Member] |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |
Common shares issued through public offering and direct share purchase plan during period |  |  |  | 0 | 0 | 3,409,927
Value authorized |  |  |  |  |  | $ 100,000,000
Value, new issues |  |  |  |  |  | $ 36,884,000

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