Annual report pursuant to Section 13 and 15(d)

Real Estate - Additional Information (Details)

v3.20.4
Real Estate - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
a
Jan. 21, 2020
USD ($)
Jul. 12, 2019
USD ($)
May 30, 2019
USD ($)
ft²
Mar. 15, 2019
USD ($)
Feb. 07, 2019
USD ($)
a
Jan. 11, 2019
USD ($)
Dec. 31, 2020
USD ($)
a
Dec. 31, 2019
USD ($)
Apr. 30, 2019
ft²
Real Estate Properties [Line Items]                    
Depreciation               $ 11,317 $ 12,020  
Impairment of assets held for sale               $ 600 $ 1,598  
Berkley Shopping Center                    
Real Estate Properties [Line Items]                    
Area of land | a 0.75             0.75    
Riversedge North | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Write off of real estate property $ (49)                  
Contract price 3,000             $ 3,000    
Net proceeds $ 2,843             $ 2,843    
St. Matthews | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Write off of real estate property   $ 26                
Contract price   1,775                
Net proceeds   $ 1,665                
Perimeter Square | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Write off of real estate property     $ 95              
Contract price     7,200              
Net proceeds     $ 0              
Graystone Crossing | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Write off of real estate property         $ (1,433)          
Contract price         6,000          
Net proceeds         $ 1,744          
Harbor Point (undeveloped land) | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Area of real estate property | a           1.28        
Write off of real estate property           $ 0        
Contract price           550        
Net proceeds           $ 19        
Jenks Plaza | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Write off of real estate property             $ (387)      
Contract price             2,200      
Net proceeds             $ 1,840      
JANAF Outparcel demolished | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Area of real estate property | ft²       10,000            
Write off of real estate property       $ 331            
JANAF Outparcel new grocer tenant                    
Real Estate Properties [Line Items]                    
Area of real estate property | ft²       20,000            
JANAF Outparcel Mariner | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Real Estate Properties [Line Items]                    
Area of real estate property | ft²                   25,000