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Investments in Real Estate Entities - Expensed Acquisition, Development and Other Pursuit Costs and Impairment of Long-Lived Assets & Casualty Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]        
Other than Temporary Impairment Losses, Investments $ 0 $ 0 $ 0 $ 0
Casualty and impairment loss $ 1,177 $ 0 $ 1,177 $ 0