SERVICER ADVANCE INVESTMENTS - Schedule of Interest Income Related to Investments in Servicer Advances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]
Interest income	$ 232,198	$ 416,047	$ 634,571	$ 854,914
Servicer Advance Investments
Schedule of Equity Method Investments [Line Items]
Interest income, gross of amounts attributable to servicer compensation	27,905	13,932	17,655	29,008
Amounts attributable to base servicer compensation	(2,504)	(1,407)	(1,622)	(2,972)
Amounts attributable to incentive servicer compensation	(5,230)	(7,080)	(13,951)	(13,507)
Interest income	$ 20,171	$ 5,445	$ 2,082	$ 12,529