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Investments in Real Estate Entities (Details 3) $ in Thousands | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) community land_parcel home | Sep. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | May 31, 2016 | Jan. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Investments in unconsolidated real estate entities | $ 176,882 |  | $ 176,882 |  |  |  |  | $ 216,919
Gain on sale of other real estate | 10,778 | $ 0 | $ 10,921 | $ 9,647 |  |  |  |
Number of Communities Acquired | community |  |  | 4 |  |  |  |  |
Current interest rate (as a percent) |  |  |  |  |  | 3.35% |  |
Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs | 3,804 | 3,391 | $ 7,086 | 5,251 |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate | 0 | 658 | $ (3,935) | (10,668) |  |  |  |
Number of Land Parcels Impaired | land_parcel |  |  | 3 |  |  |  |  |
Real Estate Investment Property, Net | 14,812,162 |  | $ 14,812,162 |  |  |  |  | $ 13,847,526
Avalon Hoboken [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Apartment Homes, Acquired | home |  |  | 217 |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 129,700 |  |  |  |  |
Avalon Potomac Yard [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Apartment Homes, Acquired | home |  |  | 323 |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 108,250 |  |  |  |  |
Avalon Columbia Pike [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Apartment Homes, Acquired | home |  |  | 269 |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 102,000 |  |  |  |  |
Studio 77 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Apartment Homes, Acquired | home |  |  | 156 |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 72,100 |  |  |  |  |
Notes Payable Maturities 2020 [Member] | Secured notes | Avalon Hoboken [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  | $ 67,904 |
Current interest rate (as a percent) |  |  |  |  |  |  | 4.18% |
Notes Payable Maturities 2019 [Member] | Secured notes | Avalon Columbia Pike [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 70,507 |  | $ 70,507 |  |  |  |  |
Current interest rate (as a percent) | 3.38% |  | 3.38% |  |  |  |  |
Land [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  | 0 | $ 10,500 | 0 |  |  |  |
Avalon at Edgewater [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  | (8,702) | (15,663) |  |  |  |
Insurance Proceeds |  |  | 29,008 | 44,142 | $ 73,150 |  |  |
Real Estate Investment Property, Net |  | 21,844 |  | 21,844 |  |  |  |
Casualty Loss |  | $ 658 |  | 6,635 |  |  |  |
Gain on Business Interruption Insurance Recovery |  |  | 20,306 |  |  |  |  |
New England [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  | (5,732) |  |  |  |  |
Insurance Proceeds |  |  | 8,493 |  |  |  |  |
Casualty Loss |  |  | $ 2,761 |  |  |  |  |
AVA North Point [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 55.00% |  | 55.00% |  |  |  |  |
Gain on sale of other real estate |  |  | $ 10,621 |  |  |  |  |
Avalon Clarendon [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investments | $ 120,300 |  | $ 120,300 |  |  |  |  |
Number of Apartment Homes, Acquired | home |  |  | 300 |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  | $ 4,322 |  |  |  |  |
Investments in unconsolidated real estate entities | $ 115,848 |  | $ 115,848 |  |  |  |  |
New England [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  |  | 4,195 |  |  |  |
New England [Member] | Avalon at Edgewater [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  |  | $ 26,039 |  |  |  |
Joint Venture Partner [Member] | AVA North Point [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 45.00% |  | 45.00% |  |  |  |  |

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