Collaborative Agreement (Details) ft² in Thousands, $ in Thousands	Aug. 31, 2018 USD ($) ft²	Mar. 01, 2018
Investments in unconsolidated joint ventures:
Ownership percentage		25.00%
Outside partner interest of the operating partnership		75.00%
Proceeds from sale | $	$ 142,500
Reimbursement percent		75.00%
Westside Pavilion
Investments in unconsolidated joint ventures:
Property area (in square feet) | ft²	755