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Real Estate Investment Real Estate Investment - Property Disposition (Details) - USD ($)
$ in Thousands
6 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Jul. 17, 2019
Real Estate Properties [Line Items]        
Contract price   $ 1,014 $ 4,271  
Waynesboro Commons | Waynesboro Commons | Held-for-sale        
Real Estate Properties [Line Items]        
Contract price $ 1,100      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 0      
Subsequent Event | Lightfoot Marketplace | Lightfoot Marketplace | Held-for-sale        
Real Estate Properties [Line Items]        
Agreed upon selling price       $ 30,300