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Organization (Details) ft² in Millions	12 Months Ended
Organization (Details) ft² in Millions	Dec. 31, 2019 ft² a building property market land_parcel
Real Estate Properties [Line Items]
Number of markets \| market	6
Number of properties \| property	220
Area of real estate property \| a	77.6
Buildings [Member]
Real Estate Properties [Line Items]
Number of properties \| building	220
Improved land parcels [Member]
Real Estate Properties [Line Items]
Number of properties \| land_parcel	19
Area of real estate property \| ft²	13.3
Redevelopment property [Member]
Real Estate Properties [Line Items]
Number of properties \| property	4
Area of real estate property \| ft²	0.5