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Debt and Preferred Equity Investments - Rollforward of Total Allowance for Loan Loss Reserves (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Loan loss reserve activity    
Balance at beginning of year $ 1,750 $ 5,750
Current period provision for loan loss 11,784 0
Write-offs charged against the allowance (26,229) (4,000)
Balance at end of period 15,109 1,750
Cumulative adjustment upon adoption of ASC 326    
Loan loss reserve activity    
Balance at beginning of year $ 27,804 0
Balance at end of period   $ 27,804