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Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2021 USD ($) entity	Mar. 31, 2021 USD ($) entity	Mar. 31, 2020 USD ($)
Schedule Of Equity Method Investments [Line Items]
Number of entities - equity method of accounting (entity) | entity	29	29
Number of 50/50 joint ventures | entity	17	17
Long-lived assets	$ 38,500,000	$ 38,500,000	$ 114,300,000
Gain on deconsolidation		55,131,000
Loans in default, aggregate outstanding balance	$ 825,856,000	825,856,000
West Melbourne I, LLC
Schedule Of Equity Method Investments [Line Items]
Loan maturity date	Feb. 28, 2026
Loan agreement term	4 years
Loan term of extension option	1 year
Loan outstanding balance	$ 54,260,000	54,260,000
Port Orange I, LLC
Schedule Of Equity Method Investments [Line Items]
Loan maturity date	Feb. 28, 2026
Loan agreement term	4 years
Loan term of extension option	1 year
Loan outstanding balance	$ 52,898,000	$ 52,898,000
Ambassador Infrastructure, LLC
Schedule Of Equity Method Investments [Line Items]
Loan maturity date		Mar. 31, 2025
Loan agreement term		4 years
Loan outstanding balance	$ 8,250,000	$ 8,250,000
Line of credit fixed interest rate	3.00%	3.00%
Amount paid in conjunction with modification		$ 1,110,000
Loans in default, aggregate outstanding balance	$ 689,695,000	689,695,000
Asheville Mall and Park Plaza
Schedule Of Equity Method Investments [Line Items]
Long-lived assets	$ 0	0
Gain on deconsolidation		$ 55,131,000
Minimum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	20.00%	20.00%
Ownership in variable interest entity (as a percent)		50.00%
Maximum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	65.00%	65.00%
Ownership in variable interest entity (as a percent)		92.00%

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