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Summary of Significant Accounting Policies - Narrative Details (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accounting Policies [Abstract]          
Goodwill $ 0   $ 0   $ 25,222
Impairment of goodwill 0 $ 0 (25,222) $ 0  
Restricted cash included in receivables and other assets 31,511 $ 957 31,511 $ 957 2,800
Residential loans receivable 41,600   41,600   41,200
Operating lease right-of-use asset 8,800   8,800   9,300
Operating lease liabilities $ 9,400   $ 9,400   $ 9,800
Residential loans, delinquency period     90 days