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Beneficiaries Equity of the Parent Company (Details Textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Jul. 20, 2015 | May. 28, 2015 | Nov. 05, 2013
Class of Stock [Line Items] |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  | 1,535,102 | 1,763,739 |  |  |  |
Distributions Payable |  | $ 29,021 |  | $ 28,871 |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.90% |  | 6.90% |  |  |
Dividends, Preferred Stock, Cash |  | $ 3,450 | $ 3,450 |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  | $ 27,300 |  |
Dividend Paid [Member] | Subsequent Event [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | $ 1,700 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Fees and Commissions Percentage |  | 2.00% |  |  |  |  |

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