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%