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MORTGAGES AND OTHER NOTES PAYABLE Secured and Unsecured Credit Facilities (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Jul. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Total amount of credit facility $ 525,000,000    
Amount borrowed 309,710,000   $ 127,100,000
Net borrowings (repayments) during the year ended December 31, 2015 182,610,000    
Letters of Credit 17,500,000    
Amount available under credit facilities as of December 31, 2015 197,790,000    
Unsecured Debt [Member] | Unsecured Line [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility [1] 150,000,000    
Amount borrowed [1] 20,800,000   0
Net borrowings (repayments) during the year ended December 31, 2015 [1] 20,800,000    
Letters of Credit [1] 17,500,000    
Amount available under credit facilities as of December 31, 2015 [1] 111,700,000    
Term Loan [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 50,000,000.0 $ 50,000,000.0  
Term Loan [Member] | Term Loan One [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 50,000,000    
Amount borrowed 50,000,000   50,000,000
Net borrowings (repayments) during the year ended December 31, 2015 0    
Letters of Credit 0    
Amount available under credit facilities as of December 31, 2015 0    
Term Loan [Member] | Term Loan Two [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 50,000,000    
Amount borrowed 50,000,000   0
Net borrowings (repayments) during the year ended December 31, 2015 50,000,000    
Letters of Credit 0    
Amount available under credit facilities as of December 31, 2015 0    
Term Loan [Member] | Term Loan Three [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 50,000,000    
Amount borrowed 50,000,000   0
Net borrowings (repayments) during the year ended December 31, 2015 50,000,000    
Letters of Credit 0    
Amount available under credit facilities as of December 31, 2015 0    
Term Loan [Member] | Fund II Line [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 25,000,000    
Amount borrowed 12,500,000   0
Net borrowings (repayments) during the year ended December 31, 2015 12,500,000    
Letters of Credit 0    
Amount available under credit facilities as of December 31, 2015 12,500,000    
Term Loan [Member] | Fund IV Term Loan [Member] | Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility 50,000,000    
Amount borrowed 34,500,000   0
Net borrowings (repayments) during the year ended December 31, 2015 34,500,000    
Letters of Credit 0    
Amount available under credit facilities as of December 31, 2015 15,500,000    
Term Loan [Member] | Fund IV Revolving Subscription Line [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Total amount of credit facility [2] 150,000,000    
Amount borrowed [2] 91,910,000   $ 77,100,000
Net borrowings (repayments) during the year ended December 31, 2015 [2] 14,810,000    
Letters of Credit [2] 0    
Amount available under credit facilities as of December 31, 2015 [2] $ 58,090,000    
[1] Includes origination and exit fees
[2] The Fund IV revolving subscription line of credit is secured by unfunded investor capital commitments.