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Combined Guarantor Subsidiaries - Dispositions - Summary of Disposition (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on extinguishment of debt	$ 71,722,000		$ 30,927,000
Loss on impairment	239,521,000	$ 174,529,000	71,401,000
Non-recourse loans on operating properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Balance of Non-recourse Debt		43,716,000
Guarantor Subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on extinguishment of debt	61,796,000	0	28,815,000
Loss on impairment	60,170,000	$ 0	43,007,000
Guarantor Subsidiaries | Acadiana Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment			$ 43,007,000
Guarantor Subsidiaries | Malls
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on impairment	60,170,000
Guarantor Subsidiaries | Non-recourse loans on operating properties | Malls | Acadiana Mall
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Balance of Non-recourse Debt	119,760,000
Gain on extinguishment of debt	$ 61,796,000

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