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LOANS RECEIVABLE AND INVESTMENTS - Narrative 2 (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 28, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Proceeds from sale of loans       $ 198,500,000   $ 97,000,000  
Investment in loans receivable and other       $ 154,949,000 $ 74,386,000    
Gain on repayment of loans receivable           $ 1,900,000  
Unsecured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan           1  
Debt instrument, face amount           $ 20,000,000  
Secured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan       3   1  
Debt instrument, face amount           $ 78,400,000  
Secured mortgage loans and other              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Recognized gain on sale of investments       $ 8,700,000      
Investment in loans receivable and other   $ 140,000,000          
Secured loan, stated interest rate, percentage   9.95%          
Number of loans sold | loan           3  
Non-mortgage loans receivable              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans sold | loan           1  
Corporate Debt Securities              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Recognized gain on sale of investments     $ 5,800,000        
Available-for-sale securities, amortized cost basis     71,000,000        
Proceeds from sale of investment     $ 76,800,000        
Unrealized gain on investment             $ 5,000,000
Wexford Acquisition | Non-mortgage loans receivable              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loans | loan       3      
Loans receivable       $ 13,371,496      
Subsequent Event | LHP | Secured Debt              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Debt instrument, face amount $ 700,000,000            
Debt instrument, term of loan 5 years            
Interest rate 8.00%