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Investments in Real Estate Entities - Narrative of Investment in Real Estate Entities (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) entity ft² | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) home ft² community entity | Sep. 30, 2020 USD ($)
Equity method investment |  |  |  |
Number of communities acquired | community |  |  | 4 |
Payments to Acquire Other Real Estate |  |  | $ 392,746 | $ 0
Nonoperating expense related to development pursuits | $ (417) | $ (567) | (1,900) | (4,289)
Casualty and impairment loss | 1,940 | 0 | 3,117 | 0
Other than Temporary Impairment Losses, Investments | 0 | 0 | 0 | 0
Hurricane | East Coast |  |  |  |
Equity method investment |  |  |  |
Casualty and impairment loss | $ 1,971 |  | 1,971 |
Fire |  |  |  |
Equity method investment |  |  |  |
Casualty and impairment loss |  |  | $ 1,146 |
AC JV |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Communities Sold | community |  |  | 2 |
Avalon North Point and Avalon North Point Lofts | Notes Payable Maturities 2021 | Secured Debt |  |  |  |
Equity method investment |  |  |  |
Repayments of Secured Debt |  |  | $ 111,653 |
Avalon Arundel Crossing East |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Homes Acquired | home |  |  | 384 |
Payments to Acquire Other Real Estate |  |  | $ 119,000 |
Avalon Lakeside |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Homes Acquired | home |  |  | 425 |
Payments to Acquire Other Real Estate |  |  | $ 117,000 |
Commercial Square Feet | ft² | 18 |  | 18 |
HUB South End |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Homes Acquired | home |  |  | 265 |
Payments to Acquire Other Real Estate |  |  | $ 104,350 |
Commercial Square Feet | ft² | 23 |  | 23 |
Three30Five |  |  |  |
Equity method investment |  |  |  |
Number of Apartment Homes Acquired | home |  |  | 164 |
Payments to Acquire Other Real Estate |  |  | $ 52,650 |
The Park Loggia |  |  |  |
Equity method investment |  |  |  |
Proceeds from Sale of Real Estate | $ 54,277 |  | $ 107,278 |
Commercial Square Feet | ft² | 66 |  | 66 |
Casualty and impairment loss | $ 0 | 0 | $ 0 | 0
Land Parcel |  |  |  |
Equity method investment |  |  |  |
Casualty and impairment loss | $ 0 | $ 0 | $ 0 | $ 0
Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Number of unconsolidated real estate entities | entity | 8 |  | 8 |
AC JV |  |  |  |
Equity method investment |  |  |  |
Proceeds from Sale of Real Estate |  |  | $ 325,000 |
AC JV | Avalon North Point and Avalon North Point Lofts |  |  |  |
Equity method investment |  |  |  |
Number Of Apartment Homes Sold | home |  |  | 529 |
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  | $ 23,305 |
Minimum | Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Ownership percentage | 20.00% |  | 20.00% |
Maximum | Unconsolidated real estate entities |  |  |  |
Equity method investment |  |  |  |
Ownership percentage | 50.00% |  | 50.00% |

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