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MORTGAGE LOAN RECEIVABLES - Additional Information (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
loan
Dec. 31, 2016
USD ($)
Dec. 31, 2016
loan
Dec. 31, 2016
number_mortgage_loans_impaired
Dec. 31, 2015
USD ($)
Dec. 31, 2015
loan
Dec. 31, 2015
number_mortgage_loans_impaired
Mortgage Loans on Real Estate [Line Items]                  
Loans receivable with fixed rates of interest       $ 205,400,000     $ 343,200,000    
Percentage of loans receivable with fixed rates of interest 10.30% 19.70%              
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost       600,000     700,000    
Number of mortgage loans impaired         0 0   0 0
Accrued and unpaid interest receivable       24,439,000     22,776,000    
Amortized cost of non-accrual loans       2,353,977,000     2,310,409,000    
Real estate acquired in settlement of mortgage loan receivable held for investment $ 0 $ 6,700,000 $ 0            
Mortgage loans on real estate, carrying amount       2,357,977,000          
Mortgage Loans on Real Estate, Interest Rate 6.73% 6.83%              
Remaining Maturity (years) 2 years 1 month 6 days 2 years 6 months 29 days              
Other                  
Mortgage Loans on Real Estate [Line Items]                  
Real estate acquired in settlement of mortgage loan receivable held for investment   $ 6,700,000              
Gain (Loss) on Sale of Mortgage Loans   $ 800,000              
Mortgage loans on real estate, carrying amount             5,900,000    
Mortgage loan receivables held for investment, at amortized cost                  
Mortgage Loans on Real Estate [Line Items]                  
Loans receivable with fixed rates of interest       1,800,000,000     1,400,000,000    
Percentage of loans receivable with fixed rates of interest 89.70% 80.30%              
Number or loans in default | loan 2 0              
Loans in default, carrying value       26,900,000          
Impairment recorded on defaulted loans $ 0                
Accrued and unpaid interest receivable       3,500,000          
Default interest included in accrued and unpaid interest receivable       2,200,000          
Amortized cost of non-accrual loans       1,996,095,000     1,738,645,000    
Mortgage Loans on Real Estate, Interest Rate 7.17% 7.56%              
Remaining Maturity (years) 1 year 7 months 28 days 1 year 4 months 17 days              
Mortgage loan receivables held for sale                  
Mortgage Loans on Real Estate [Line Items]                  
Loans receivable with fixed rates of interest       360,500,000     571,800,000    
Percentage of loans receivable with fixed rates of interest 100.00% 100.00%              
Amortized cost of non-accrual loans       $ 357,882,000     $ 571,764,000    
Mortgage Loans on Real Estate, Interest Rate 4.20% 4.56%              
Remaining Maturity (years) 4 years 6 months 18 days 6 years 2 months 12 days              
Loan on non-accrual status                  
Mortgage Loans on Real Estate [Line Items]                  
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost     $ 2,600,000            
Number of loans on non-accrual status | loan 0 0 1            
Amortized cost of non-accrual loans     $ 5,500,000