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Investments in Real Estate Entities (Details 3) $ in Thousands | 3 Months Ended | 15 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) land_parcel | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business Combination, Acquisition Related Costs, Abandoned Pursuit Costs | $ 728 | $ 746 |  |
Real Estate [Line Items] |  |  |  |
Casualty and impairment loss (gain), net | (11,688) | $ 2,202 |  |
Number of land parcels impaired | land_parcel |  | 2 |  |
Net operating real estate | 15,171,803 |  |  | $ 15,045,593
Insurance proceeds for property damage claims | 4,095 | $ 8,702 |  |
Insurance proceeds receivable | 287,130 |  |  | $ 256,934
Land [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Casualty and impairment loss (gain), net | (9,350) | (6,500) |  |
Avalon Maplewood [Member] |  |  |  |
Real Estate [Line Items] |  |  |  |
Casualty and impairment loss (gain), net | (2,338) |  |  |
Casualty loss | 19,481 |  |  |
Net operating real estate | 16,361 |  |  |
Other nonrecurring expense | 3,120 |  |  |
Insurance Recoveries | 17,143 |  |  |
Insurance proceeds for property damage claims | 4,545 |  |  |
Insurance proceeds receivable | $ 12,598 |  |  |
Avalon at Edgewater [Member] |  |  |  |
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 |  |
Avalon Brooklyn Bay [Member] |  |  |  |
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 | $ 32,036 |  |  |

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