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Organization - Narrative (Details) ft² in Thousands	12 Months Ended
Organization - Narrative (Details) ft² in Thousands	Dec. 31, 2018 ft² joint_venture property	Dec. 31, 2017 ft² joint_venture property	Dec. 31, 2016 ft² joint_venture property
Organization [Line Items]
Number of retail properties \| property			71
Number of joint ventures \| joint_venture	2	2	2
Corporate Joint Venture
Organization [Line Items]
Area of real estate property \| ft²	2,600	3,000	3,000
Number of managed retail properties \| property	13	15	15
Retail
Organization [Line Items]
Number of retail properties \| property	1	2
Area of real estate property \| ft²	9,500	12,400	12,200
Square Feet \| ft²	470	1,690
Retail \| CARY PARK TOWN CENTER Cary, NC
Organization [Line Items]
Square Feet \| ft²		501
Retail
Organization [Line Items]
Number of retail properties \| property	58	71