The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Property, Plant, and Equipment - Schedule of loss (gain) on sale or write down of assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Write-down of assets	$ (1,505)	$ (212)	$ (42,115)	$ (16,121)
(Loss) gain on sale or write down of assets, net	11,786	(131)	(28,784)	(15,506)
Write-down of non-real estate assets	(1,361)		(4,154)
Wilton Mall
Property, Plant and Equipment [Line Items]
Write-down of assets			(30,063)
Paradise Valley Mall
Property, Plant and Equipment [Line Items]
Write-down of assets			(6,640)
Land
Property, Plant and Equipment [Line Items]
Gain on sale	$ 13,291	$ 81	$ 13,331	$ 615