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Investments in Real Estate Entities (Details 3) $ in Thousands | 3 Months Ended | 6 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) land_parcel | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) land_parcel | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, acquisition related costs, abandoned pursuit costs | $ 570 | $ 606 | $ 1,298 | $ 1,352 |  |
Real Estate [Line Items] |  |  |  |  |  |
Casualty and impairment loss (gain), net | 0 | $ 1,732 | (11,688) | $ 3,935 |  |
Number of land parcels impaired | land_parcel |  | 1 |  | 3 |  |
Net operating real estate | 15,297,364 |  | 15,297,364 |  |  | $ 15,045,593
Insurance proceeds for property damage claims |  |  | 6,192 | $ 17,196 |  |
Insurance proceeds receivable | 266,909 |  | 266,909 |  |  | $ 256,934
Land |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Casualty and impairment loss (gain), net |  | $ (4,000) | (9,350) | (10,500) |  |
Avalon Maplewood |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  | (2,338) |  |  |
Casualty loss |  |  | (19,481) |  |  |
Net operating real estate | 16,361 |  | 16,361 |  |  |
Other nonrecurring expense |  |  | 3,120 |  |  |
Insurance recoveries |  |  | 17,143 |  |  |
Insurance proceeds for property damage claims | 1,647 |  | 6,192 |  |  |
Insurance proceeds receivable | 10,951 |  | $ 10,951 |  |  |
Avalon at Edgewater |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  | 8,702 |  |
Insurance recoveries |  |  |  | 29,008 | $ 73,150 |
Gain on business interruption insurance recovery |  |  |  | 20,306 |  |
New England |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |
Casualty and impairment loss (gain), net |  | (5,732) |  | (5,732) |  |
Casualty loss |  | (2,761) |  | (2,761) |  |
Insurance recoveries |  | $ 8,493 |  | $ 8,493 |  |
Avalon Brooklyn Bay |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage |  |  | 70.00% |  |  |
Variable interest entity, ownership interest by partner |  |  | 30.00% |  |  |
Due from related parties | $ 38,310 |  | $ 38,310 |  |  |

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