Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs

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The charge against earnings in the period to reduce the carrying amount of real property to fair value resulting from a casualty event.

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Number of Land Parcels Impaired

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Percentage of the Variable Interest Entity's (VIE) voting interest not owned by the reporting entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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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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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount of other expense that is infrequent in occurrence or unusual in nature.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Investments in Real Estate Entities (Details 3) $ in Thousands	3 Months Ended		6 Months Ended		15 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) land_parcel	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) land_parcel	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Business combination, acquisition related costs, abandoned pursuit costs	$ 570	$ 606	$ 1,298	$ 1,352
Real Estate [Line Items]
Casualty and impairment loss (gain), net	0	$ 1,732	(11,688)	$ 3,935
Number of land parcels impaired \| land_parcel		1		3
Net operating real estate	15,297,364		15,297,364			$ 15,045,593
Insurance proceeds for property damage claims			6,192	$ 17,196
Insurance proceeds receivable	266,909		266,909			$ 256,934
Land
Real Estate [Line Items]
Casualty and impairment loss (gain), net		$ (4,000)	(9,350)	(10,500)
Avalon Maplewood
Real Estate [Line Items]
Casualty and impairment loss (gain), net			(2,338)
Casualty loss			(19,481)
Net operating real estate	16,361		16,361
Other nonrecurring expense			3,120
Insurance recoveries			17,143
Insurance proceeds for property damage claims	1,647		6,192
Insurance proceeds receivable	10,951		$ 10,951
Avalon at Edgewater
Real Estate [Line Items]
Casualty and impairment loss (gain), net				8,702
Insurance recoveries				29,008	$ 73,150
Gain on business interruption insurance recovery				20,306
New England
Real Estate [Line Items]
Casualty and impairment loss (gain), net		(5,732)		(5,732)
Casualty loss		(2,761)		(2,761)
Insurance recoveries		$ 8,493		$ 8,493
Avalon Brooklyn Bay
Business Acquisition [Line Items]
Variable interest entity, qualitative or quantitative information, ownership percentage			70.00%
Variable interest entity, ownership interest by partner			30.00%
Due from related parties	$ 38,310		$ 38,310