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Organization, Basis of Presentation, and Significant Accounting Policies - Income Taxes and Deferred Financing Costs (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) community
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] |  |  |
Excise tax refund | $ 0 | $ 0 | $ 0
Excise and sales taxes | 0 | 0 | 0
Income tax (expense) benefit | 5,733,000 | (3,247,000) | $ 13,003,000
Number of communities sold with deferred tax obligations | community |  |  | 2
Unrecognized tax benefits | $ 0 | $ 0 |
Tax components of common stock dividends declared |  |  |
Ordinary income (as a percent) | 55.00% | 66.00% | 96.00%
20% capital gain (as a percent) | 26.00% | 24.00% | 3.00%
Capital gain tax rate (as a percent) | 20.00% | 20.00% | 20.00%
Unrecaptured 1250 gain (as a percent) | 19.00% | 10.00% | 1.00%
Unsecured notes |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | $ 23,705,000 | $ 25,239,000 |
Secured notes |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | 2,300,000 | 2,046,000 |
Variable rate unsecured credit facility |  |  |
Accounting Policies [Line Items] |  |  |
Accumulated amortization of deferred finance costs | $ 15,187,000 | $ 13,501,000 |

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- Definition The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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