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Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended		12 Months Ended
		Feb. 10, 2020	Feb. 11, 2019	Mar. 31, 2022	Feb. 28, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 01, 2022	Nov. 01, 2021
Subsequent Event [Line Items]
Fair value carrying amount						$ 2,092,298				$ 133,000
Common stock, par value (USD per share)						$ 0.001	$ 0.01
Common stock issued (shares)						20,774,716	196,569,917
Available-for-sale securities - at fair value (amortized cost of $149,999 and $233,053 as of December 31, 2021 and December 31, 2020, respectively)	[1]					$ 149,996	$ 233,071
Performance Shares
Subsequent Event [Line Items]
Granted (shares)							3,408,083	1,103,537
Performance period		3 years	3 years
Cross Creek Mall
Subsequent Event [Line Items]
Loan outstanding balance						102,264
Greenbrier Mall
Subsequent Event [Line Items]
Loan outstanding balance						61,647
Exchangeable Notes Indenture | 7.0% Exchangeable Senior Secured Notes Due 2028
Subsequent Event [Line Items]
Fair value carrying amount						$ 150,000
Debt instrument, maturity date						Nov. 15, 2028
U.S Treasury Securities
Subsequent Event [Line Items]
Available-for-sale securities - at fair value (amortized cost of $149,999 and $233,053 as of December 31, 2021 and December 31, 2020, respectively)						$ 149,996	$ 233,071
Subsequent Event | Performance Shares
Subsequent Event [Line Items]
Granted (shares)					550,000
Performance period					4 years
Subsequent Event | Fayette Mall
Subsequent Event [Line Items]
Line of credit fixed interest rate					4.25%
Loan maturity date					May 31, 2023
Debt instrument, term					3 years
Loan term of extension option					1 year
Loan agreement term					3 years
Subsequent Event | York Town Center Lp
Subsequent Event [Line Items]
Debt instrument, term				18 months
Loan agreement term				18 months
Subsequent Event | York Town Center Lp | Mortgage Note Payable | Nonrecourse
Subsequent Event [Line Items]
Fair value carrying amount				$ 30,000
Debt instrument, term				3 years
Debt Instrument, Interest Rate, Effective Percentage				4.75%
Loan agreement term				3 years
Subsequent Event | Exchangeable Notes Indenture | 7.0% Exchangeable Senior Secured Notes Due 2028
Subsequent Event [Line Items]
Fair value carrying amount									$ 150,000
Common stock, par value (USD per share)									$ 0.001
Common stock issued (shares)									10,982,795
Subsequent Event | U.S Treasury Securities
Subsequent Event [Line Items]
Available-for-sale securities - at fair value (amortized cost of $149,999 and $233,053 as of December 31, 2021 and December 31, 2020, respectively)					$ 149,936
Debt instrument, maturity date					May 31, 2022
[1] As of December 31, 2021, includes $262,265 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $143,593 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 12.

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