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Investments in Partnerships - FDP Sale of Unit (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Equity Method Investments [Line Items]          
Gain on sales of real estate by equity method investee   $ (10) $ 0 $ 1,337 $ 0
Sale of 801 Market Street, Unit 202          
Schedule Of Equity Method Investments [Line Items]          
Gain on sales of real estate by equity method investee $ 1,300        
Sale of 801 Market Street, Unit 202 | Partnership Interest          
Schedule Of Equity Method Investments [Line Items]          
Proceeds from real estate and real estate joint ventures 5,300        
Gain on sales of real estate by equity method investee $ 2,600        
Ownership percentage 50.00%