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REAL ESTATE AND OTHER AFFILIATES (Narrative) (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
item
Mar. 31, 2015
USD ($)
item
Dec. 31, 2017
USD ($)
Real Estate and Other Affiliates      
Number of variable interest entities in which entity is primary beneficiary | item 3    
Carrying values of the assets associated with the operations of the consolidated VIEs $ 22,800,000   $ 24,800,000
Carrying values of the liabilities associated with the operations of the consolidated VIEs 1,200,000   $ 2,700,000
The Summit      
Real Estate and Other Affiliates      
Preferred return on capital   5.00%  
Cash distribution entitlement by the joint venture | item   2  
Equity Method Investments | The Summit      
Real Estate and Other Affiliates      
Contribution of property   $ 13,400,000  
SID bonds transferred to joint venture   1,300,000  
Transaction value of land contributed to joint venture   125,400,000  
Transactional value per acre of land contributed to joint venture   226,000  
Maximum | Equity Method Investments | The Summit      
Real Estate and Other Affiliates      
Maximum contribution required to joint venture by co-venturer   $ 30,000,000  
Unconsolidated Properties      
Real Estate and Other Affiliates      
Secured debt real estate affiliates 187,600,000    
Share of entity in secured debt $ 86,800,000