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Fair Value Inputs, Estimated Selling Costs as a Percentage of Total Fair Value

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Number of Office Buildings with Impairment

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Number of Stores Disposed

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Number of Stores with Impairment

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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The number of derivative instruments of a particular group held by the entity.

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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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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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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair Value Measurements (Details) $ in Thousands	1 Months Ended			3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
Fair Value Measurements (Details) $ in Thousands	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) mall outparcel anchor_store office_building	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) derivative_instrument
Liabilities:
Interest rate swaps													$ 434
Long-term debt, fair value	$ 4,799,363			$ 4,799,363				$ 4,799,363		$ 4,799,363			4,945,622
Mortgage and other indebtedness, net	4,531,269			4,531,269				4,531,269		4,531,269			4,710,628
Fair Value	85,818			85,818				85,818		85,818
Loss on impairment				53,558		$ 884		$ 116,736	$ 3,665
Number of office buildings with impairment \| office_building								3
Number of outparcels with impairment \| outparcel								3
Long-term debt	4,531,269			4,531,269				$ 4,531,269		4,531,269			4,710,628
Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Interest rate swaps													0
Significant Other Observable Inputs (Level 2)
Liabilities:
Interest rate swaps													434
Significant Unobservable Inputs (Level 3)
Liabilities:
Interest rate swaps													$ 0
Fair Value	85,818			85,818				85,818		85,818
The Lakes and Fashion Square, Wausau Center, Bonita Lakes, Midland Mall and Ridge River Mall
Liabilities:
Loss on impairment								$ 116,736
Number of malls with impairment \| mall								9
Randolph Mall, Regency Mall, and Walnut Square
Liabilities:
Fair Value	31,318			31,318				$ 31,318		31,318
Loss on impairment	43,294
Number of malls with impairment \| mall								3
Sales price	32,250			32,250				$ 32,250		$ 32,250
Percentage of total consolidated revenues										1.50%
One Oyster Point and Two Oyster Point
Liabilities:
Fair Value	6,000			6,000				$ 6,000		$ 6,000
Loss on impairment	3,844
Percentage of total consolidated revenues										0.10%
Number of office buildings with impairment \| office_building								2
Capitalization rate (as a percent)								8.00%
Discount rate (as a percent)								10.00%
Estimated selling costs as a percentage of total fair value								2.00%
Oak Branch Business Center
Liabilities:
Fair Value	0			0				$ 0		$ 0
Loss on impairment	122
Cobblestone Village at Palm Coast
Liabilities:
Fair Value	8,300			8,300				$ 8,300		$ 8,300
Loss on impairment	6,298
Percentage of total consolidated revenues										0.10%
Capitalization rate (as a percent)								9.00%
Discount rate (as a percent)								10.80%
Estimated selling costs as a percentage of total fair value								2.00%
The Lakes and Fashion Square
Liabilities:
Fair Value	0	$ 65,447		0			$ 65,447	$ 0		$ 0	$ 65,447
Loss on impairment		32,096
Sales price		66,500					$ 66,500				$ 66,500
Percentage of total consolidated revenues											1.60%
Wausau Center
Liabilities:
Fair Value	11,000			11,000				$ 11,000		$ 11,000
Loss on impairment		$ 10,738
Percentage of total consolidated revenues										0.30%
Holding period (up to) (in years)							10 years
Capitalization rate (as a percent)							13.25%
Discount rate (as a percent)							13.00%
Number of properties disposed of \| anchor_store								2
Bonita Lakes Mall and Crossing
Liabilities:
Fair Value	0		$ 27,440	0	$ 27,440			$ 0		$ 0		$ 27,440
Loss on impairment			5,323
Sales price			27,910		$ 27,910							$ 27,910
Percentage of total consolidated revenues												0.70%
Midland Mall
Liabilities:
Fair Value	29,200			29,200				29,200		$ 29,200
Loss on impairment			4,681
Percentage of total consolidated revenues										0.60%
Holding period (up to) (in years)					10 years
Capitalization rate (as a percent)					9.75%
Discount rate (as a percent)					11.50%
River Ridge Mall
Liabilities:
Fair Value	0			0				0		$ 0
Loss on impairment			$ 9,510
Percentage of total consolidated revenues												0.60%
Non-recourse loan \| Wausau Center
Liabilities:
Long-term debt	$ 17,689			$ 17,689				$ 17,689		$ 17,689
River Ridge Mall
Liabilities:
Loss on impairment					$ 9,510
Ownership percentage sold			75.00%					75.00%
Reserve for capital expenditures					$ 2,100
Outparcel Sale
Liabilities:
Loss on impairment								$ 830
Number of properties disposed of \| outparcel								3
Minimum \| One Oyster Point and Two Oyster Point
Liabilities:
Holding period (up to) (in years)								1 year
Minimum \| Cobblestone Village at Palm Coast
Liabilities:
Holding period (up to) (in years)								1 year
Maximum \| One Oyster Point and Two Oyster Point
Liabilities:
Holding period (up to) (in years)								2 years
Maximum \| Cobblestone Village at Palm Coast
Liabilities:
Holding period (up to) (in years)								2 years
Interest Rate Swap
Liabilities:
Number of Instruments \| derivative_instrument													4
Retail Site [Member]
Liabilities:
Loss on impairment								$ 115,906