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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 04, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]            
Investments carried at fair value or cost   $ 3,994   $ 3,994   $ 3,811
Impairment of investments   (57,423) (57,423)  
Subscription Agreement [Member]            
Schedule of Equity Method Investments [Line Items]            
Investments carried at fair value or cost           7,500
General Partners' Contributed Capital           5,400
Increase in Investment           1,900
Riverdale            
Schedule of Equity Method Investments [Line Items]            
Repayment related to mortgage $ 7,900          
Recognized gain in shares amount 600          
Proceeds from sale of property $ 10,500          
Venture Capital Gain (Loss), Net           $ 3,200
Core Portfolio | Fifth Wall Ventures Retail Fund, L.P.            
Schedule of Equity Method Investments [Line Items]            
Investments carried at fair value or cost   $ 200   $ 200