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Combined Guarantor Subsidiaries - Mortgage and Other Notes Receivable - Summary (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Balance $ 4,662,000 $ 7,672,000
Mortgage Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Balance 2,637,000 4,884,000
Other Notes Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Balance 2,025,000 2,788,000
Guarantor Subsidiaries    
Accounts Notes And Loans Receivable [Line Items]    
Balance 75,016,000 76,747,000
Guarantor Subsidiaries | Mortgage Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Balance $ 73,786,000 $ 75,517,000
Guarantor Subsidiaries | Mortgage Receivable | The Promenade    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2020-06  
Interest Rate (as a percent) 5.00% 5.00%
Balance $ 47,514,000 $ 47,514,000
Guarantor Subsidiaries | Mortgage Receivable | Hamilton Corner    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2020-02  
Interest Rate (as a percent) 5.67% 5.67%
Balance $ 14,295,000 $ 14,295,000
Guarantor Subsidiaries | Mortgage Receivable | The Terrace    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2020-06  
Interest Rate (as a percent) 7.25%  
Balance $ 11,977,000  
Guarantor Subsidiaries | Mortgage Receivable | Madison Grandview Forum, LLC    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2023-09  
Interest Rate (as a percent) 5.25% 5.25%
Balance   $ 12,400,000
Guarantor Subsidiaries | Mortgage Receivable | Village Square    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2019-09  
Interest Rate (as a percent)   4.00%
Balance   $ 1,308,000
Guarantor Subsidiaries | Other Notes Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Balance $ 75,016,000 $ 76,747,000
Guarantor Subsidiaries | Other Notes Receivable | Community improvement district    
Accounts Notes And Loans Receivable [Line Items]    
Maturity Date 2028-08  
Interest Rate (as a percent) 6.75% 7.50%
Balance $ 1,230,000 $ 1,230,000