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Beneficiaries Equity of the Parent Company (Textual) (Details) - USD ($)
 3 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
May 24, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Jul. 22, 2015
Nov. 05, 2013
Class of Stock [Line Items]                  
Dividends, Common Stock $ 28,200,000                
Preferred Stock, Dividend Rate, Percentage       6.90%     6.90%    
Dividends, Preferred Stock   $ 1,725,000 $ 1,725,000 $ 3,450,000 $ 3,450,000        
Shares Authorized For Equity Offering Program                 16,000,000
Authorized Amount               $ 100,000,000  
Number of shares available for repurchase under the preexisting share repurchase program               539,200  
Repurchased and Retired, Shares       0 0 5,209,437      
Share Price       $ 12.90          
Repurchased and Retired, Value       $ 67,300,000          
Common shares price per share   $ 0.01   $ 0.01   $ 0.01 $ 0.01    
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   $ 25.00      
Dividends, Preferred Stock $ 1,700,000                
Offering Program [Member]                  
Class of Stock [Line Items]                  
Remaining Shares Available For Sales   16,000,000   16,000,000   16,000,000      
Offering Program [Member] | Maximum [Member]                  
Class of Stock [Line Items]                  
Fees and Commissions Percentage       2.00%          
Dividend Declared [Member]                  
Class of Stock [Line Items]                  
Dividends Payable, Amount Per Share $ 0.16                
Redeemable Common Limited Partnership Units                  
Class of Stock [Line Items]                  
Antidilutive Securities Excluded from Computation of Earnings Per Share       1,479,799 1,535,102