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REAL ESTATE (Real Estate Sale) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
property
Nov. 04, 2019
USD ($)
Real Estate [Line Items]        
Total real estate, cost and net of impairment charges $ 545,406 $ 547,310    
Accumulated depreciation 51,723 35,704    
Gain on sale of real estate $ 4,178 $ 0 $ 0  
Disposed of by Sale        
Real Estate [Line Items]        
Number of properties disposed | property   0 0  
Disposed of by Sale | Office Building        
Real Estate [Line Items]        
Number of properties disposed | property 1 0    
Gain on sale of real estate $ 4,200      
Disposed of by Sale | Office Building | 2200 Paseo Verde        
Real Estate [Line Items]        
Consideration       $ 18,700
Total real estate, cost and net of impairment charges       13,500
Accumulated depreciation       $ 2,000
Gain on sale of real estate $ 4,200