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Real Estate Disposition Activities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) community land_parcel	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) community home land_parcel	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Summary of income from discontinued operations
Gain on sale of communities	$ 27,243	$ 27,738	$ 132,444	$ 159,754
Cash in escrow	$ 225,704	$ 181,069	$ 225,704	181,069	$ 134,818
Number of communities held for sale | community	3		3
Number of land parcels held for sale | land_parcel	1		1
Mortgage note receivable payments			$ 50,929	$ 0
Avalon at Blue Hills and Avalon Canton at Blue Hills [Member]
Summary of income from discontinued operations
Number of Apartment Homes Sold | home			472
Proceeds from sale of real estate			$ 131,250
Gain on sale of communities			$ 57,666
Eaves North Quincy [Member]
Summary of income from discontinued operations
Number of Apartment Homes Sold | home			224
Proceeds from sale of real estate			$ 64,250
Gain on sale of communities			$ 18,055
Avalon Anaheim Stadium [Member]
Summary of income from discontinued operations
Number of Apartment Homes Sold | home			251
Proceeds from sale of real estate			$ 111,600
Gain on sale of communities			$ 29,490
Avalon Ballston Place [Member]
Summary of income from discontinued operations
Number of Apartment Homes Sold | home			383
Proceeds from sale of real estate			$ 169,000
Gain on sale of communities			27,215
Cash in escrow	$ 85,828		$ 85,828
West Hollywood Affordable [Member]
Summary of income from discontinued operations
Number of Apartment Homes Sold | home			77
Mortgage note receivable payments, including interest	16,627
Mortgage note receivable payments	$ 15,900

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The cash inflow associated with the proceeds from sale of notes receivable, as well as principal collections from a borrowing supported by a written promise to pay an obligation (note receivable).

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