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Organization, Basis of Presentation, and Significant Accounting Policies - Income Taxes and Deferred Financing Costs (Details)
 12 Months Ended
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