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MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]      
Provision for loan losses at beginning of period $ 17,900 $ 4,000  
Provision for loan and lease losses 300 3,000  
Provision for loan losses at end of period 18,200 $ 7,000  
Principal balance of loans on non-accrual status $ 36,850   $ 36,850