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Real Estate Investments - Mortgage Loans Activity (Details) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Real Estate Investments      
Originations and fundings under mortgage loans receivable $ 426,000 $ 2,557,000  
Scheduled principal payments received (625,000) (565,000)  
Mortgage loan premium amortization (3,000) (2,000)  
Provision for loan loss reserve 2,000 (20,000)  
Net (decrease) increase in mortgage loans receivable (200,000) 1,970,000  
Interest receivable 35,977,000   $ 32,746,000
Write-off of accrued interest receivable $ 0 $ 0