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Real Estate Disposition Activities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) community land_parcel | Dec. 31, 2016 USD ($) community land_parcel | Dec. 31, 2016 USD ($) community land_parcel | Dec. 31, 2016 USD ($) community land_parcel home | Dec. 31, 2016 USD ($) community land_parcel | Dec. 31, 2016 USD ($) community land_parcel building | Dec. 31, 2015 USD ($) home | Dec. 31, 2014 USD ($) home
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number of owned communities under construction | community | 27 | 27 | 27 | 27 | 27 | 27 |  |
Gain on sale of communities |  |  |  |  | $ 374,623 |  | $ 115,625 | $ 84,925
Number of Land Parcels Sold | land_parcel |  |  | 1 |  |  |  |  |
Gain on sale of other real estate |  |  |  |  | $ 10,224 |  | $ 9,647 | $ 490
Accounts receivable, balance to be received, period | 35 years |  |  |  |  |  |  |
Number of Land Parcels Held For Sale | land_parcel | 2 | 2 | 2 | 2 | 2 | 2 |  |
Eaves Trumbull [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 340 |  |  |  |
Gross sales price |  |  |  |  | $ 70,250 |  |  |
Net cash proceeds (1) |  |  |  |  | 68,665 |  |  |
Avalon Essex |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 154 |  |  |  |
Gross sales price |  |  |  |  | 45,100 |  |  |
Net cash proceeds (1) |  |  |  |  | 44,085 |  |  |
Eaves Nanuet |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 504 |  |  |  |
Gross sales price |  |  |  |  | 147,000 |  |  |
Net cash proceeds (1) |  |  |  |  | 145,722 |  |  |
Avalon Shrewsbury |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 251 |  |  |  |
Gross sales price |  |  |  |  | 60,500 |  |  |
Net cash proceeds (1) |  |  |  |  | 59,263 |  |  |
Avalon at Freehold |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 296 |  |  |  |
Gross sales price |  |  |  |  | 68,000 |  |  |
Net cash proceeds (1) |  |  |  |  | 66,320 |  |  |
Avalon Brandemoor I and II [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Apartment homes | home |  |  |  | 506 |  |  |  |
Gross sales price |  |  |  |  | 132,000 |  |  |
Net cash proceeds (1) |  |  |  |  | 128,021 |  |  |
Other Real Estate Sales [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Gain on sale of other real estate |  |  |  |  | 10,224 |  |  |
Gross sales price |  |  |  |  | 41,178 |  |  |
Net cash proceeds (1) |  |  |  |  | 20,641 |  |  |
West Hollywood Affordable [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number of apartment buildings sold |  | 1 |  |  |  | 1 |  |
Apartment homes | home |  |  |  | 77 |  |  |  |
Accounts Receivable, Net | $ 18,643 | $ 18,643 | $ 18,643 | $ 18,643 | 18,643 | $ 18,643 |  |
Accounts Receivable, Net, Current | $ 16,891 | $ 16,891 | $ 16,891 | $ 16,891 | 16,891 | $ 16,891 |  |
Wholly Owned Properties |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number of apartment communities sold | community |  | 7 |  |  |  |  |  |
Sale of Communities Gross Sales Price |  |  |  |  | 522,850 |  |  |
Gain on sale of communities |  |  |  |  | 370,301 |  |  |
Apartment homes | home |  |  |  | 2,051 |  |  | 851 | 1,337
Repayments of secured mortgages |  |  |  |  | 0 |  | $ 0 | $ 16,341
Gross sales price |  |  |  |  | 564,028 |  | 289,320 | 304,250
Net cash proceeds (1) |  |  |  |  | $ 532,717 |  | $ 282,163 | $ 281,125
AVA North Point [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% | 55.00% |  |
Gain on sale of other real estate |  |  |  |  | $ 10,621 |  |  |
Avalon West Hollywood [Member] | Development Communities [Member] |  |  |  |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |  |  |  |
Number of owned communities under construction | community | 1 | 1 | 1 | 1 | 1 | 1 |  |

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