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MORTGAGE AND OTHER NOTES PAYABLE (Details)
1 Months Ended 6 Months Ended
May. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
extension_option
Dec. 31, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]        
Mortgage and other notes payable     $ 1,326,667,000 $ 1,130,481,000
Number of loan extensions | extension_option     1  
Length of loan extension   6 months    
Unsecured credit facility | Line of Credit        
Mortgage Loans on Real Estate [Line Items]        
Amount borrowed from credit facility     $ 83,500,000  
Outstanding balance under credit facility     83,500,000  
Unsecured credit facility | Line of Credit | Fund IV        
Mortgage Loans on Real Estate [Line Items]        
New mortgage loans     50,000,000  
Commitment fee threshold amount   $ 20,000,000.0    
Line of credit     34,500,000  
Line of Credit Facility, Unused Capacity Over Threshold Amount, Commitment Fee Percentage   1.00%    
Line of Credit Facility, Unused Capacity Under Threshold Amount, Commitment Fee Percentage   2.75%    
Unsecured credit facility | Line of Credit | Fund IV | LIBOR        
Mortgage Loans on Real Estate [Line Items]        
Basis spread on variable rate   2.75%    
Unsecured credit facility | Line of Credit | Fund II        
Mortgage Loans on Real Estate [Line Items]        
Amount borrowed from credit facility $ 12,500,000      
New mortgage loans 25,000,000      
Commitment fee threshold amount $ 12,500,000.0      
Commitment fee percentage 2.75%      
Basis spread on variable rate 2.75%      
Convertible Debt [Member]        
Mortgage Loans on Real Estate [Line Items]        
Redemption of debt     400,000  
Line of Credit | Subscription Line | Line of Credit | Fund IV        
Mortgage Loans on Real Estate [Line Items]        
Repayment of line of credit     (54,700,000)  
Mortgage and other notes payable     $ 22,400,000