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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revenue Recognition, Real Estate Sale and Equity Securities) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Feb. 28, 2018
a
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
a
Accounting Policies [Abstract]          
Contract liability $ 1,700       $ 2,000
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Tenant reimbursements 2,682 $ 5,637      
Cumulative effect adjustments to retained earnings         $ 2,472
Park Highlands | Undeveloped Land | Disposed of by Sale          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Area of land sold | a     26   102
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustments to retained earnings         $ 27,618
Accounting Standards Update 2014-09 | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustments to retained earnings       $ 2,500  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Tenant reimbursements $ 400        
Accounting Standards Update 2016-01 | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect adjustments to retained earnings         $ 25,100