Real Estate Activities - Disposition (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2022	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of preferred equity		$ 3,700
Mortgage loans payable, net		844,987		$ 851,283
Proceeds from redemption of preferred equity	$ 2,500
Valley View Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on derecognition of property			$ 8,100
Valley View Mall | Mortgage Loan
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mortgage loans payable, net		$ 27,200		$ 27,200