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Organization - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
ft²
joint_venture
partially_owned_asset
Properties
Assets
Dec. 31, 2016
ft²
joint_venture
Properties
Assets
Organization [Line Items]    
Number of retail properties | Properties   71
Area of real estate property 501,276 322,326
Number of joint ventures | joint_venture 2 2
Retail [Member]    
Organization [Line Items]    
Number of retail properties | Properties 71  
Retail [Member]    
Organization [Line Items]    
Number of retail properties | partially_owned_asset 2  
Area of real estate property 12,444,703 12,155,909
Occupied [Member]    
Organization [Line Items]    
Square footage occupied (percent) 98.00% 69.90%
Occupied [Member] | Retail [Member]    
Organization [Line Items]    
Square footage occupied (percent) 94.20% 93.00%
Corporate Joint Venture [Member]    
Organization [Line Items]    
Number of retail properties | joint_venture 1 1
Area of real estate property 2,976,403 2,977,303
Number of managed retail properties | Assets 15 15