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RELATED PARTY TRANSACTIONS (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 03, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 05, 2019
Dec. 12, 2018
Mar. 13, 2017
Oct. 18, 2016
Affiliated Entity                  
RELATED PARTY TRANSACTIONS                  
Investment in mutual fund   $ 800,000   $ 800,000         $ 10,000,000.0
Fee earned on assets under management       0.75%          
Fund's cap expense       0.95%          
Affiliated Entity | Related Reserve IV LLC | B Participation Interest                  
RELATED PARTY TRANSACTIONS                  
Mortgage loan participation purchased by related party               $ 4,000,000.0  
Participating mortgage loan amount (up to)               $ 136,500,000  
Percentage of loans receivable with fixed rates of interest               17.00%  
Affiliated Entity | Related Reserve IV LLC | B Participation Interest | Participation Financing - Mortgage Loan Receivable                  
RELATED PARTY TRANSACTIONS                  
Interest expense, debt   100,000 $ 100,000 $ 200,000 $ 200,000        
Affiliated Entity | Brickell Heights Commercial LLC | First mortgage loan                  
RELATED PARTY TRANSACTIONS                  
Loans receivable from related party           $ 14,300,000 $ 6,400,000    
Related | Class A Common Stock                  
RELATED PARTY TRANSACTIONS                  
Related party purchases of shares from shareholders $ 80,000,000.0                
Consolidated Joint Venture | Brickell Heights Commercial LLC | First mortgage loan | Woodbury, New York                  
RELATED PARTY TRANSACTIONS                  
Interest income, related party   14,500   100,000          
Consolidated Joint Venture | Brickell Heights Commercial LLC | First mortgage loan | Bloomfield Heights, Michigan                  
RELATED PARTY TRANSACTIONS                  
Interest income, related party   $ 200,000   $ 300,000          
Consolidated Joint Venture | Related Special Assets LLC | Brickell Heights Commercial LLC                  
RELATED PARTY TRANSACTIONS                  
Ownership Interest           0.70% 12.00%