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Acquisitions and Transaction Costs - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
property
Business Acquisition [Line Items]          
Transaction costs $ 0 $ 1,089 $ 2,771 $ 1,550  
Number of operating properties acquired | property         4
Assumption of mortgages by buyer upon sale of properties     $ 0 $ 40,303  
Colleyville Downs, Belle Isle Station, Livingston Shopping Center and Chapel Hill Shopping Center          
Business Acquisition [Line Items]          
Payments to Acquire Real Estate         $ 185,800
Chapel Hill Operating Property          
Business Acquisition [Line Items]          
Assumption of mortgages by buyer upon sale of properties         $ 18,300