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Organization, Basis of Presentation, and Significant Accounting Policies (Details 2) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) community | Dec. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |
Minimum distribution of adjusted taxable income for deducting dividends from federally taxable income (as a percent) | 90.00% |  |
Minimum distribution of REIT taxable income for federal income tax exemption (as a percent) | 100.00% |  |
Accounting Policies [Line Items] |  |  |
Right of use lease assets | $ 133,581,000 | $ 103,063,000 |
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits | 0 | 0 |
Excise and sales taxes | 0 | 0 | $ 0
Excise tax refund | 0 | 0 | 0
Income Tax Expense (Benefit) | (3,247,000) | 13,003,000 | (160,000)
Casualty and impairment loss, net | 0 | 0 | 215,000
Impairment of investment in unconsolidated entities | $ 0 | $ 0 | $ 0
Deferred Financing Costs |  |  |
Number Of Communities Sold With Deferred Tax Obligations | community |  | 2 |
Tax components of common stock dividends declared |  |  |
Ordinary income (as a percent) | 66.00% | 96.00% | 76.00%
20% capital gain (as a percent) | 24.00% | 3.00% | 11.00%
Capital gain tax rate (as a percent) | 20.00% | 20.00% | 20.00%
Unrecaptured 1250 gain (as a percent) | 10.00% | 1.00% | 13.00%
Unsecured notes |  |  |
Deferred Financing Costs |  |  |
Accumulated amortization of deferred finance costs | $ 25,239,000 | $ 25,995,000 |
Secured notes |  |  |
Deferred Financing Costs |  |  |
Accumulated amortization of deferred finance costs | 2,046,000 | 1,784,000 |
Variable rate unsecured credit facility |  |  |
Deferred Financing Costs |  |  |
Accumulated amortization of deferred finance costs | 13,501,000 | 11,815,000 |
The Park Loggia [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Income Tax Expense (Benefit) |  | 5,782,000,000 |
TRS Disposed Communities [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Income Tax Expense (Benefit) |  | 7,221,000,000 |
Land |  |  |
Income Tax Disclosure [Abstract] |  |  |
Casualty and impairment loss, net | 0 | 0 | $ 826,000
Development Communities | The Park Loggia [Member] |  |  |
Income Tax Disclosure [Abstract] |  |  |
Casualty and impairment loss, net | $ 0 | $ 0 |
Minimum | Buildings and Building Improvements |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful life of buildings and improvements (in years) | 7 years |  |

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