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Beneficiaries Equity of the Parent Company (Details Textuals) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Oct. 19, 2015 | Sep. 15, 2015 | Jul. 22, 2015 | Nov. 05, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to non-controlling interests |  | $ 161,000 | $ 108,000 | $ 221,000 | $ 47,000 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  | 1,535,102 | 1,721,905 |  |  |  |  |
Distributions Payable |  | $ 28,318,000 |  | $ 28,318,000 |  | $ 28,871,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  | 6.90% |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  | $ 5,175,000 | $ 5,175,000 |  |  |  |  |
Authorized Amount |  |  |  |  |  |  |  |  | $ 100,000,000.0 |
Number of Shares Authorized to be Repurchased |  | 539,200 |  | 539,200 |  |  |  |  |  |
Repurchased and Retired, Shares |  |  |  | 4,701,302 |  |  |  |  |  |
Share Price |  |  |  | $ 12.92 |  |  |  |  |  |
Repurchased and Retired, Value |  |  |  | $ 60,817,000 |  |  |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.90% |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 25.00 |  | $ 25.00 |  |  |  |  |  |
Offering Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares Authorized For Equity Offering Program |  |  |  |  |  |  |  |  |  | 16,000,000
Remaining Shares Available For Sales |  | 16,000,000 |  | 16,000,000 |  |  |  |  |  |
Dividend Declared [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  |  | $ 0.15 |  |
Dividend Paid [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions Payable |  |  |  |  |  |  | $ 26,600,000 |  |  |
Dividend Paid [Member] | Subsequent Event [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 1,700,000 |  |  |  |  |  |  |  |  |
Maximum [Member] | Offering Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Fees and Commissions Percentage |  |  |  | 2.00% |  |  |  |  |  |

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