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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 01, 2020	Dec. 31, 2020	Mar. 31, 2021	Aug. 08, 2019
Schedule of Equity Method Investments [Line Items]
Cost method investments		$ 1,881	$ 2,615
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Cost method investments			2,500
Impairment of investments		$ 400
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P.
Schedule of Equity Method Investments [Line Items]
Cost method investments			$ 1,100	$ 1,800
Cost method investment ownership percentage				5.00%
Core Portfolio | Brandywine Portfolio
Schedule of Equity Method Investments [Line Items]
Note receivable exchanged	$ 38,700
Note receivable accrued interest	$ 2,000
Equity method investment, ownership percentage by third party	24.78%
Equity method investment, controlling interest percentage	100.00%

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