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INVESTMENTS IN PARTNERSHIPS Sale of Partnership Investments (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 02, 2015
Sep. 30, 2017
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2015
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]            
Sale Price   $ 61,500        
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 200 $ 6,700   $ 6,539
Gain (Loss) on Disposition of Assets   $ 13,100        
Gallery At Market East [Member]            
Schedule of Equity Method Investments [Line Items]            
Proceeds from Equity Method Investment, Distribution, Return of Capital       $ 30,300    
Springfield Park [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investment, Ownership Percentage         50.00%  
Goodwill, Written off Related to Sale of Business Unit         $ 100  
Proceeds from Divestiture of Real Estate Partnership         20,200  
Capitalization Rate 7.00%          
Equity Method Investment, Realized Gain (Loss) on Disposal         12,000  
Mortgage Loans on Real Estate, Carrying Amount of Mortgages         $ 9,000