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Real Estate Disposition Activities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) community item | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) community land_parcel item home | Jun. 30, 2014 USD ($) | Dec. 31, 2008 USD ($)
Summary of income from discontinued operations |  |  |  |  |
Number of Apartment Communities Sold | community |  |  | 1 |  |
Number of Land Parcels Sold | land_parcel |  |  | 2 |  |
Proceeds from Sale of Real Estate |  |  | $ 135,841 | $ 186,651 |
Gain on sale of real estate | $ 9,625 | $ 0 | 9,647 | 0 |
Gain on sale of discontinued operations | $ 0 | 0 | 0 | 37,869 |
Gain on sale of communities |  |  | $ 91,456 | 98,814 |
Number Of Communities Held For Sale | community | 1 |  | 1 |  |
Impairment of Real Estate | $ 0 | $ 0 |  | $ 0 |
Other Real Estate Sales [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 23,820 |  |
Gain on sale of real estate |  |  | $ 9,626 |  |
Avalon on Stamford Harbor [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Apartment homes | home |  |  | 323 |  |
Number of Boat Slips in Marina Communities | item | 74 |  | 74 |  |
Proceeds from Sale of Real Estate |  |  | $ 115,500 |  |
Gain on sale of communities |  |  | 70,936 |  |
Other Real Estate Sales [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Impairment of Real Estate |  |  |  |  | $ 5,933
Avalon Mills [Member] |  |  |  |  |
Summary of income from discontinued operations |  |  |  |  |
Impairment of Real Estate |  |  | $ 800 |  |

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- Definition Represents the number of boat slips in marina communities. + References No definition available. + Details
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- Definition Number of Land Parcels Sold + References No definition available. + Details
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