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MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Allowance for Loan and Lease Losses [Roll Forward]                
Provision for loan losses at beginning of period     $ 20,500,000   $ 17,900,000 $ 17,900,000    
Provision expense for current expected credit loss (implementation impact)     17,993,000   300,000      
Provision for loan losses     26,581,000   300,000      
Additional asset-specific reserve     8,000,000   0      
Foreclosure of loans subject to asset-specific reserve     (2,000,000)   0      
Provision for loan losses at end of period     49,457,000   18,200,000 20,500,000 $ 17,900,000  
Principal balance of loans on non-accrual status   $ 142,387,000 142,387,000 $ 142,387,000   98,725,000    
Cumulative Effect, Period Of Adoption, Adjusted Balance                
Allowance for Loan and Lease Losses [Roll Forward]                
Provision expense for current expected credit loss (implementation impact)     4,964,000   $ 0      
Total mortgage loan receivables held for investment, net, at amortized cost                
Allowance for Loan and Lease Losses [Roll Forward]                
Provision expense for current expected credit loss (implementation impact)     4,964,000          
Provision for loan losses     (2,000,000)          
Loans in default, carrying value   $ 61,500,000 61,500,000 $ 61,500,000     $ 45,000,000.0  
Total mortgage loan receivables held for investment, net, at amortized cost | Two Company Loans                
Allowance for Loan and Lease Losses [Roll Forward]                
Number or loans in default   2   2     2  
Loans in default, carrying value   $ 26,900,000 26,900,000 $ 26,900,000   $ 26,900,000 $ 46,400,000  
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 2                
Allowance for Loan and Lease Losses [Roll Forward]                
Loans in default, carrying value   7,700,000 7,700,000 $ 7,700,000        
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 1                
Allowance for Loan and Lease Losses [Roll Forward]                
Number or loans in default       2        
Loans in default, carrying value   46,400,000 46,400,000 $ 46,400,000        
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan                
Allowance for Loan and Lease Losses [Roll Forward]                
Number or loans in default 1     1   1 1 1
Loans in default, carrying value $ 5,900,000 4,100,000 4,100,000 $ 4,100,000     $ 4,100,000 $ 5,900,000
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Series B                
Allowance for Loan and Lease Losses [Roll Forward]                
Loans in default, carrying value           $ 10,400,000 $ 10,000,000.0  
Total mortgage loan receivables held for investment, net, at amortized cost | Asset Specific Reserve, Company Loan                
Allowance for Loan and Lease Losses [Roll Forward]                
Loans in default, carrying value   $ 46,400,000 $ 46,400,000 $ 46,400,000   $ 61,500,000