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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Real Estate Properties [Line Items]          
Impairment of goodwill $ 0 $ 0 $ 0 $ 25,222  
Restricted cash included in other assets 75,557 $ 31,511 75,557 $ 31,511  
Collections receivable from loan servicers, recoverable advances and interest receivable 65,900   65,900   $ 63,600
Operating lease right-of-use asset 9,600   9,600   10,100
Operating lease liabilities 10,200   10,200   10,600
Other Assets          
Real Estate Properties [Line Items]          
Restricted cash included in other assets 75,600   75,600   11,300
Operating real estate $ 125,300   $ 125,300   $ 50,500