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REAL ESTATE (Impairment of Real Estate) (Details) - USD ($)
12 Months Ended 36 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Real Estate Properties [Line Items]        
Impairment charges on real estate $ 0 $ 14,745,000 $ 0  
Real estate, net 493,683,000 511,606,000   $ 493,683,000
Capitalized capital lease assets       6,800,000
Capitalized development cost       3,800,000
Capitalized other certain costs       9,200,000
210 West 31st Street        
Real Estate Properties [Line Items]        
Impairment charges on real estate   14,700,000    
Real estate, net 55,244,000 54,900,000   $ 55,244,000
Purchase price $ 48,000,000.0      
Transaction costs   $ 1,800,000