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Area of a real estate property.

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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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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Impairment (Narrative) (Details)		3 Months Ended				9 Months Ended		12 Months Ended
Impairment (Narrative) (Details)	Jul. 16, 2020 USD ($) hotel_room	Sep. 30, 2020 USD ($) ft²	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) ft²	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jul. 15, 2020
Real Estate [Line Items]
Impairment of real estate		$ 0			$ 0	$ 48,738,000	$ 0
Equity method investment, impairment								$ 0
Mr. C Seaport
Real Estate [Line Items]
Number of hotel rooms \| hotel_room	66
Equity method investment, proceeds from sale	$ 800,000
Equity Method Investments \| Mr. C Seaport
Real Estate [Line Items]
Equity method investment, impairment		0	$ 6,000,000.0		0	6,000,000	0
Number of hotel rooms \| hotel_room	66
Equity method investment, ownership percentage									35.00%
Condominium Inventory
Real Estate [Line Items]
Impairment of real estate		944,000			0	6,022,000	0
Outlet Collection, Riverwalk
Real Estate [Line Items]
Impairment of real estate		$ 0		$ 48,700,000	$ 0	$ 48,738,000	$ 0
Area of real estate property (in sqft) \| ft²		273,270				273,270
Assets, fair value disclosure				$ 46,800,000
Fair value capitalization rate				0.10