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Mortgage and Other Indebtedness, Net - Narrative (Details)	1 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2019 USD ($)	Jun. 30, 2019 USD ($) associated_center mortgage_note_receivable mall subsidiary	Dec. 31, 2018 USD ($) unsecured_term_loan	Apr. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Number of malls securing the credit facility | mall		17
Number of associated centers securing the credit facility | associated_center		3
Number of wholly owned subsidiaries | subsidiary		36
Ownership interest in guarantor subsidiaries by Operating Partnership (as a percent)		100.00%
Principal maturities for remainder of fiscal year		$ 139,396,000
Principal maturities for remainder of fiscal year Related to maturing operating property loans		$ 98,256,000
Weighted-average maturity period		4 years 3 months 18 days	3 years 8 months 12 days
Unsecured lines of credit
Debt Instrument [Line Items]
Number of debt instruments | unsecured_term_loan			3
Maximum borrowing capacity			$ 1,100,000,000
Secured line of credit
Debt Instrument [Line Items]
Variable-rate debt		$ 383,084,000
Unsecured term loans
Debt Instrument [Line Items]
Total Outstanding			$ 695,000,000			$ 500,000,000
Number of debt instruments | unsecured_term_loan			3
Non-recourse loans on operating properties
Debt Instrument [Line Items]
Total Outstanding		163,476,000
Default minimum of debt instrument		50,000,000
Secured term loan
Debt Instrument [Line Items]
Variable-rate debt		$ 482,500,000
Secured Debt | Line of Credit
Debt Instrument [Line Items]
Total Outstanding							$ 1,185,000,000
Interest rate (as a percent)		4.69%
Quarterly installment payments on debt							35,000,000
Secured Debt | Line of Credit | Minimum
Debt Instrument [Line Items]
Annual facility fee (as a percent)		0.25%
Secured Debt | Line of Credit | Maximum
Debt Instrument [Line Items]
Annual facility fee (as a percent)		0.35%
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Total Outstanding							685,000,000
Secured Debt | Unsecured term loans
Debt Instrument [Line Items]
Total Outstanding							500,000,000
LIBOR | Unsecured Term Loan 1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		2.25%
Guarantor Subsidiaries
Debt Instrument [Line Items]
Number of malls securing the credit facility | mall		17
Number of associated centers securing the credit facility | associated_center		3
Number of wholly owned subsidiaries | subsidiary		36
Number of malls not classified as collateral for the secured credit facility | mall		5
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 for the secured credit facility | mortgage_note_receivable		4
Principal maturities for remainder of fiscal year		$ 68,980,000
Weighted-average maturity period		1 year 10 months 24 days	1 year 1 month 6 days
Guarantor Subsidiaries | Mortgages
Debt Instrument [Line Items]
Total Outstanding								$ 37,295,000
Interest rate (as a percent)								5.75%
Guarantor Subsidiaries | Secured Debt | Line of Credit
Debt Instrument [Line Items]
Total Outstanding							$ 1,185,000
Volusia Mall | Mortgages
Debt Instrument [Line Items]
Total Outstanding				$ 50,000,000	$ 41,000,000
Stated interest rate (as a percent)				4.56%	8.00%
Outlet Shoppes at Laredo | Mortgages
Debt Instrument [Line Items]
Total Outstanding	$ 43,000,000
Early repayment of debt	$ 10,800,000

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