SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Other Income (Loss), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other income (loss), net
Unrealized gain (loss) on secured notes and bonds payable	$ 12,991	$ (966)	$ (1,236)
Unrealized gain (loss) on contingent consideration	(1,037)	(6,568)	(10,487)
Unrealized gain (loss) on equity investments	5,986	(54,455)	(3,096)
Gain (loss) on transfer of loans to REO	3,752	7,945	11,842
Gain (loss) on transfer of loans to other assets	(9)	(939)	(1,144)
Gain (loss) on Ocwen common stock	2,181	3,235	174
Provision for servicing losses	(41,038)	(15,330)	(9,102)
Bargain purchase gain	6,024	0	49,539
Rental revenue	13,750	2,422	194
Ancillary income	53,358	22,987	6,538
Property and maintenance revenue	104,797	70,527	14,449
Other income (loss)	(26,787)	(40,855)	(17,852)
Total other income (loss), net	$ 133,968	$ (11,997)	$ 39,819