Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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The cash outflow for loan and debt issuance costs.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Investments in Partnerships Mortgage Loan Activity Partnerships (Details) - USD ($) $ in Thousands			3 Months Ended
	Mar. 01, 2018	Feb. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Proceeds from Equity Method Investment, Distribution			$ 2,742	$ 3,771
Mortgage loans payable, net			1,062,070		$ 1,056,084
Payments of Financing Costs			436	$ 11
Fashion District Philadelphia [Member]
Debt Instrument [Line Items]
Loans Payable			$ 250,000
Debt Instrument, Interest Rate Terms			LIBOR plus 2.00%
Proceeds from Equity Method Investment, Distribution			$ 123,000
Equity Method Investment, Ownership Percentage			50.00%
Gloucester Premium Outlets [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		LIBOR plus 1.50%
Equity Method Investment, Ownership Percentage			25.00%
Mortgage Loans on Real Estate, Face Amount of Mortgages	$ 86,000
Repayments of Long-term Debt	$ 84,100
Pavilion [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms		LIBOR plus 2.85%
Debt Instrument, Maturity Date		Feb. 01, 2021
Equity Method Investment, Ownership Percentage			40.00%