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Real Estate Disposition Activities (Details) ft² in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) ft² home residential_condominium community | Dec. 31, 2019 USD ($) home | Dec. 31, 2018 USD ($) home
Summary of income from discontinued operations |  |  |
Gain on sale of communities | $ 340,444 | $ 166,105 | $ 374,976
Number of communities held for sale | community | 1 |  |
Gain (Loss) on Sale of Other Investments | $ 8,213 | 0 | 0
Other Selling, General and Administrative Expense | 5,662 | 3,812 | 1,044
Inventory, Real Estate | 267,219 | 457,809 |
Income Tax Expense (Benefit) | $ (3,247) | $ 13,003 | $ (160)
Number of Residential Condominiums Sold | residential_condominium | 70 |  |
Number of Residential Condominiums Remaining to be Sold | residential_condominium | 102 |  |
Avalon Shelton [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 250 |  |
Gross sales price | $ 64,750 |  |
Net cash proceeds | $ 63,030 |  |
Avalon Tinton Falls [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 216 |  |
Gross sales price | $ 64,900 |  |
Net cash proceeds | $ 63,371 |  |
Avalon Towers [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 109 |  |
Gross sales price | $ 54,000 |  |
Net cash proceeds | $ 53,079 |  |
Avalon Somerset [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 384 |  |
Gross sales price | $ 110,000 |  |
Net cash proceeds | $ 107,415 |  |
Eaves San Rafael [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 254 |  |
Gross sales price | $ 106,000 |  |
Net cash proceeds | $ 104,462 |  |
Avalon Cohasset [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 220 |  |
Gross sales price | $ 90,250 |  |
Net cash proceeds | $ 88,673 |  |
Avalon Wilton on Danbury Rd [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 100 |  |
Gross sales price | $ 34,750 |  |
Net cash proceeds | $ 33,744 |  |
Avalon at Stratford [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 130 |  |
Gross sales price | $ 30,600 |  |
Net cash proceeds | $ 29,808 |  |
Eaves Diamond Heights [Member] |  |  |
Summary of income from discontinued operations |  |  |
Number Of Apartment Homes Sold | home | 154 |  |
Gross sales price | $ 72,500 |  |
Net cash proceeds | 69,469 |  |
Other Real Estate Sales |  |  |
Summary of income from discontinued operations |  |  |
Gross sales price | 6,500 |  |
Net cash proceeds | $ 6,722 |  |
Wholly Owned Properties |  |  |
Summary of income from discontinued operations |  |  |
Number of apartment communities sold | community | 9 |  |
Number Of Apartment Homes Sold | home | 1,817 | 1,660 | 3,099
Sale of communities gross sales price | $ 627,750 |  |
Gain on sale of communities | 340,444 |  |
Gross sales price | 634,250 | $ 431,280 | $ 1,378,289
Net cash proceeds | 619,773 | 422,041 | 883,313
Repayments of secured debt |  | 21,700 | $ 395,939
The Park Loggia [Member] |  |  |
Summary of income from discontinued operations |  |  |
Net cash proceeds | $ 216,372 |  |
Number of residential units in development | residential_condominium | 172 |  |
Retail square feet development | ft² | 66 |  |
Gain (Loss) on Sale of Other Investments | $ 8,213 |  |
Income Tax Expense (Benefit) |  | $ 5,782,000 |

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