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Real Estate (Details)
$ in Thousands
9 Months Ended
Sep. 24, 2018
USD ($)
Feb. 27, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
Sep. 30, 2018
USD ($)
Real Estate [Line Items]        
Gain on sale or disposal of assets and properties     $ (115) $ 4,373
Anthem Marketplace Phase II [Member]        
Real Estate [Line Items]        
Proceeds from Construction Loans Payable     $ 1,400  
Area of Real Estate Property | ft²     6,853  
Concentration Risk, Percentage     81.00%  
Torrey Square [Member]        
Real Estate [Line Items]        
Proceeds from sale of real estate $ 8,700      
Gain on sale or disposal of assets and properties $ 4,400      
Bellnot Square [Member]        
Real Estate [Line Items]        
Proceeds from sale of real estate   $ 4,700    
Gain on sale or disposal of assets and properties   $ 300