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Investments in Real Estate Entities (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) entity | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) community home entity | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Investment in Real Estate Entities |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 2 |  |
Gain on sale of communities | $ 66,410,000 | $ 327,539,000 | $ 98,899,000 | $ 333,221,000 |
Gains (Losses) on Extinguishment of Debt | 18,987,000 | $ 0 | 26,736,000 | $ (412,000) |
Long-term Debt | $ 6,288,982,000 |  | $ 6,288,982,000 |  | $ 6,448,138,000
Unconsolidated real estate entities |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of unconsolidated real estate entities | entity | 5 |  | 5 |  |
Unconsolidated real estate entities | Minimum |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Ownership interest percentage | 20.00% |  | 20.00% |  |
Unconsolidated real estate entities | Maximum |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Ownership interest percentage | 31.30% |  | 31.30% |  |
Avalon Bay Value Added Fund II LP [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 4 |  |
Repayments of secured mortgages |  |  | $ 69,036,000 |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 1,400,000 |  |
Avalon Bay Value Added Fund II LP [Member] | Eaves Plainsboro [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 776 |  |
Proceeds from sale of real estate |  |  | $ 117,000,000 |  |
Gain on sale of communities |  |  | $ 9,660,000 |  |
Avalon Bay Value Added Fund II LP [Member] | Eaves Los Alisos [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 140 |  |
Proceeds from sale of real estate |  |  | $ 39,500,000 |  |
Gain on sale of communities |  |  | $ 4,551,000 |  |
Avalon Bay Value Added Fund II LP [Member] | Captain Parker Arms [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 94 |  |
Proceeds from sale of real estate |  |  | $ 31,600,000 |  |
Gain on sale of communities |  |  | $ 3,385,000 |  |
Avalon Bay Value Added Fund II LP [Member] | Eaves Carlsbad [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 450 |  |
Proceeds from sale of real estate |  |  | $ 112,000,000 |  |
Gain on sale of communities |  |  | 12,130,000 |  |
MVPI LLC [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Payments for (Proceeds from) Other Real Estate Partnerships |  |  | $ 20,680,000 |  |
Noncontrolling Interest, Ownership Percentage by Parent | 25.00% |  | 25.00% |  |
Long-term Debt | $ 103,000,000 |  | $ 103,000,000 |  |
Fixed rate (as a percent) | 3.24% |  | 3.24% |  |
Secured notes | MVPI LLC [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Repayments of secured mortgages | $ 105,000,000 |  |  |  |

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