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Mortgage and Other Indebtedness, Net - Narrative (Details)			9 Months Ended
	Oct. 15, 2020 USD ($)	Aug. 19, 2020 USD ($)	Sep. 30, 2020 USD ($) mall associated_center subsidiary loan mortgage_note_receivable	Mar. 30, 2020 USD ($)	Aug. 06, 2020	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			6.51%			5.02%
Payment for loan				$ 11,973,000
Mortgage and other indebtedness, variable-rate debt			$ 1,183,186,000			$ 847,275,000
Number of Malls Securing Credit Facility, Collateral | mall			17
Number of Associated Centers Securing Credit Facility, Collateral | associated_center			3
Number of wholly owned subsidiaries | subsidiary			36
Line of credit facility payment restrictions			150,000
Number of loans in default | loan			15
Loans in default, aggregate outstanding balance			$ 855,864,000
Guarantor Subsidiaries
Debt Instrument [Line Items]
Number of malls not classified as collateral for the secured credit facility | mall			4
Number of associated centers not classified as collateral for the secured credit facility | associated_center			2
Number of Mortgage Notes Receivable not Classified as Collateral | mortgage_note_receivable			4
COVID-19
Debt Instrument [Line Items]
Secured credit facility, impact of uncetainity			$ 280,000,000
Letter of Credit
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,300,000
Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			5.31%			5.35%
Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Interest payment			$ 11,813,000
Debt Instrument, Face Amount			$ 450,000,000
Senior Unsecured Notes Due 2023 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			5.25%			5.25%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Interest payment			$ 18,594,000
Debt Instrument, Face Amount			$ 625,000,000
Senior Unsecured Notes Due 2026 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			5.95%			5.95%
Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Interest payment			$ 6,900,000
Debt Instrument, Face Amount			$ 300,000,000
Senior Unsecured Notes Due 2024 | Subsequent Event
Debt Instrument [Line Items]
Interest payment	$ 6,900,000
Senior Unsecured Notes Due 2024 | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			4.60%			4.60%
Senior Unsecured Notes Due 2024 | Fixed Rate Interest | Subsequent Event
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)	4.60%
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 1,185,000,000
Debt instrument, maturity date			Jul. 31, 2023
Payment for loan			$ 4,812,000
Debt Instrument, Interest Rate, Effective Percentage					5.00%
Quarterly Installment Payments on Debt			$ 35,000,000
Line of Credit | Secured Debt | Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage			0.25%
Line of Credit | Secured Debt | Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage			0.35%
Line of Credit | LIBOR Market Index Rate | Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			2.25%
Line of Credit | LIBOR Market Index Rate | Secured Debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.00%
Line of Credit | Federal Funds Rate | Secured Debt
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			0.50%
Line of Credit | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			4.50%
Line of Credit | Base Rate | Secured Debt
Debt Instrument [Line Items]
Annual interest expense		19,277,000
Line of Credit | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.25%
Line of Credit | Post-Default Rate | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			9.50%
Annual interest expense		$ 74,355,000
Revolving Credit Facility | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 685,000,000
Secured Term Loan
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			9.50%			3.94%
Mortgage and other indebtedness, variable-rate debt			$ 438,750,000			$ 465,000,000
Secured Term Loan | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 438,750,000
Secured Line of Credit
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			9.50%			3.94%
Mortgage and other indebtedness, variable-rate debt			$ 675,925,000			$ 310,925,000
Non-Recourse Loans on Operating Properties
Debt Instrument [Line Items]
Debt default threshold, minimum loan amount (greater than)			$ 50,000
Non-Recourse Loans on Operating Properties | Fixed Rate Interest
Debt Instrument [Line Items]
Weighted average interest rate (as a percent)			5.17%			5.27%

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