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IMPAIRMENT (Details)
3 Months Ended 9 Months Ended
Dec. 29, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
ft²
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
ft²
Gain recognized on the sale of Redlands Promenade       $ 32,452,000 $ 140,549,000
Capitalization rate (as a percent)       6.75%  
Impairment on real estate   $ 0 $ 0 $ 0 $ 0
Park West          
Area of Real Estate Property | ft²     249,177   249,177
Net carrying value     $ 34,900,000   $ 34,900,000
Provision for impairment         $ 35,734,000
Park West | Disposal by Sale          
Gain recognized on the sale of Redlands Promenade $ 1,100,000        
Proceeds from Sale of Real Estate $ 32,500,000