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Real Estate Investments - Mortgage Loans Activity (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Real Estate Investments      
Originations and fundings under mortgage loans receivable $ 158,000 $ 366,000  
Scheduled principal payments received (125,000) (65,000)  
Mortgage loan premium amortization (2,000) (1,000)  
Provision for loan loss reserve   (3,000)  
Net increase in mortgage loans receivable 31,000 297,000  
Interest receivable 34,491,000   $ 32,746,000
Write-off of accrued interest receivable $ 0 $ 0