Impairments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
ft²
Mar. 31, 2017
USD ($)
ft²
Real Estate Properties [Line Items]    
GLA | ft² 1,028,216 116,761
Impairment Charge | $ $ 15,902 $ 5,686
Crossroads Centre    
Real Estate Properties [Line Items]    
GLA | ft² 242,752  
Impairment Charge | $ $ 204  
Roundtree Place    
Real Estate Properties [Line Items]    
GLA | ft² 246,620  
Impairment Charge | $ $ 3,772  
Pensacola Square    
Real Estate Properties [Line Items]    
GLA | ft² 142,767  
Impairment Charge | $ $ 1,345  
Southland Shopping Plaza    
Real Estate Properties [Line Items]    
GLA | ft² 285,278  
Impairment Charge | $ $ 6,942  
Skyway Plaza    
Real Estate Properties [Line Items]    
GLA | ft² 110,799  
Impairment Charge | $ $ 3,639  
The Plaza at Salmon Run    
Real Estate Properties [Line Items]    
GLA | ft²   68,761
Impairment Charge | $   $ 3,486
Smith’s    
Real Estate Properties [Line Items]    
GLA | ft²   48,000
Impairment Charge | $   $ 2,200