SERVICER ADVANCE INVESTMENTS - Schedule of Interest Income Related to Investments in Servicer Advances (Details) - Servicer Advance Investments - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Interest income, gross of amounts attributable to servicer compensation	$ 13,375	$ 13,961
Amounts attributable to base servicer compensation	(1,480)	(1,156)
Amounts attributable to incentive servicer compensation	(7,739)	(5,993)
Interest income (expense) from servicer advance investments	$ 4,156	$ 6,812

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