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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Real Estate Properties [Line Items]          
Impairment of goodwill $ 0 $ 0 $ 0 $ 25,222  
Restricted cash included in other assets 21,898 $ 54,802 21,898 $ 54,802  
Collections receivable from loan servicers, recoverable advances and interest receivable 54,400   54,400   $ 63,600
Operating lease right-of-use asset 9,300   9,300   10,100
Operating lease liabilities 9,900   9,900   10,600
Other Assets          
Real Estate Properties [Line Items]          
Restricted cash included in other assets 21,900   21,900   11,300
Operating real estate $ 19,600   $ 19,600   $ 3,000