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Investments in Real Estate Entities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) entity | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) community entity home | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Investment in Real Estate Entities |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 5 |  |
Gain on sale of communities | $ 0 | $ 66,410 | $ 180,256 | $ 98,899 |
Gains (Losses) on Extinguishment of Debt | 0 | 18,987 | (2,461) | 26,736 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 38,485 |  | 38,485 |  | $ 40,978
Other than Temporary Impairment Losses, Investments | $ 0 | $ 0 | $ 0 | $ 0 |
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 |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  | 20.00% |  |
Unconsolidated real estate entities | Maximum |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Equity Method Investment, Ownership Percentage | 31.30% |  | 31.30% |  |
Avalon Bay Value Added Fund II LP [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Equity Method Investment, Ownership Percentage | 31.30% |  | 31.30% |  |
Number of Apartment Communities Sold | community |  |  | 2 |  |
Repayments of secured mortgages |  |  | $ 127,191 |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 1,670 |  |
Percentage of Right of Distribution | 20.00% |  | 20.00% |  |
Percentage of Right of Remaining Distribution | 80.00% |  | 80.00% |  |
Proceeds from Equity Method Investment, Dividends or Distributions | $ 3,447 |  |  |  |
Avalon Bay Value Added Fund II LP [Member] | Eaves Rancho San Diego [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 676 |  |
Proceeds from sale of real estate |  |  | $ 158,000 |  |
Gain on sale of communities |  |  | $ 13,057 |  |
Avalon Bay Value Added Fund II LP [Member] | Eaves Tustin [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 628 |  |
Proceeds from sale of real estate |  |  | $ 163,550 |  |
Gain on sale of communities |  |  | $ 23,547 |  |
US Fund [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 2 |  |
Repayments of secured mortgages |  |  | $ 94,822 |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 2,003 |  |
US Fund [Member] | Archstone Boca Town Center [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 252 |  |
Proceeds from sale of real estate |  |  | $ 56,300 |  |
Gain on sale of communities |  |  | $ 4,120 |  |
US Fund [Member] | Avalon Kips Bay [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Number of apartment homes sold | home |  |  | 209 |  |
Proceeds from sale of real estate |  |  | $ 173,000 |  |
Gain on sale of communities |  |  | 12,448 |  |
Funds [Member] |  |  |  |  |
Investment in Real Estate Entities |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | $ 12,344 |  |

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