Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Servicing fees	$ 91,231	$ 55,838
Investor receivables	63,049	89,881
Servicing advances	61,602	60,053
Pair-offs receivable	40,207	438
Receivables from sale of servicing	38,879	10,597
Due from title companies	37,144	33,663
Warehouse bank receivable	17,859	3,642
Other receivables	128	28
Provision for current expected credit losses	(10,071)	(540)
Total Accounts Receivable, Net	$ 340,028	$ 253,600