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Investments in Real Estate Entities (Details 3) $ in Thousands | 3 Months Ended | 6 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) land_parcel | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) community land_parcel home | Jun. 30, 2015 USD ($) | Mar. 31, 2016 USD ($) | May 31, 2016 | Jan. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of Communities Acquired | community |  |  | 2 |  |  |  |  |
Current interest rate (as a percent) |  |  |  |  |  | 3.35% |  |
Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs | $ 1,436 | $ 673 | $ 3,282 | $ 1,860 |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate | $ (1,732) | (17,114) | $ (3,935) | (11,326) |  |  |  |
Number of Land Parcels Impaired | land_parcel | 1 |  | 3 |  |  |  |  |
Real Estate Investment Property, Net | $ 14,381,762 |  | $ 14,381,762 |  |  |  |  | $ 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 |  |  |  |  |
Land [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate | 4,000 | 0 | 10,500 | 0 |  |  |  |
Avalon at Edgewater [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate |  | (17,114) | (8,702) | (16,321) |  |  |  |
Gain on Business Interruption Insurance Recovery |  |  | 20,306 |  |  |  |  |
Insurance Proceeds |  | 22,000 | 29,008 | 44,142 | $ 73,150 |  |  |
Real Estate Investment Property, Net |  | 21,844 |  | 21,844 |  |  |  |
Casualty Loss |  | $ 4,886 |  | 5,977 |  |  |  |
New England [Member] |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |
Impairment of Real Estate | (5,732) |  |  |  |  |  |  |
Insurance Proceeds | 8,493 |  |  |  |  |  |  |
Casualty Loss | $ 2,761 |  |  |  |  |  |  |
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 |  |  |  |  |
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% |

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