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Combined Guarantor Subsidiaries - Mortgage Notes Payable, Net - Scheduled Principal Amortization and Balloon Payments (Details) - Guarantor Subsidiaries - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements Captions [Line Items]    
2020 $ 5,574,000  
2021 77,844,000  
2022 101,772,000  
Long-term Debt, Gross 185,190,000  
Unamortized deferred financing costs (112,000) $ (361,000)
Principal balance of loan secured by Greenbrier Mall 64,801,000  
Total mortgage notes payable, net $ 249,879,000 $ 377,996,000