This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Impairment - Summary of Impairments (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment			$ 13,068	$ 48,738	$ 0
Condominium Inventory
Impaired Long-Lived Assets Held and Used [Line Items]
Condominium rights and unit sales			2,268	7,644
110 North Wacker
Impaired Long-Lived Assets Held and Used [Line Items]
Equity in earnings (losses) from real estate and other affiliates			17,673	0
Mr. C Seaport
Impaired Long-Lived Assets Held and Used [Line Items]
Equity in earnings (losses) from real estate and other affiliates			0	6,000
Outlet Collection at Riverwalk
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment		$ 48,700	0	48,738
Century Park
Impaired Long-Lived Assets Held and Used [Line Items]
Provision for impairment	$ 13,100		$ 13,068	$ 0