INVESTMENTS IN EXCESS MORTGAGE SERVICING RIGHTS - Schedule of Activity Related to the Carrying Value of Investments in Excess MSRs (Details) - Excess MSRs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Carrying Value of Investments in Excess MSRs
Beginning balance	$ 1,173,713	$ 1,399,455
Purchases	0	(71,982)
Interest income	44,440	0
Other income	46,861	103,053
Proceeds from repayments	(127,793)	4,377
Proceeds from sales	(19,084)	(252,007)
Change in fair value	(58,656)	(13,505)
Ocwen Transaction	(611,621)	4,322
Ending balance	447,860	1,173,713
Nationstar
Carrying Value of Investments in Excess MSRs
Beginning balance	532,233	611,293
Purchases	0	0
Interest income	44,386	0
Other income	6,444	46,393
Proceeds from repayments	(100,215)	2,384
Proceeds from sales	(19,084)	(120,485)
Change in fair value	(18,436)	(13,505)
Ocwen Transaction	0	6,153
Ending balance	445,328	532,233
SLS
Carrying Value of Investments in Excess MSRs
Beginning balance	2,913	3,935
Purchases	0	0
Interest income	54	0
Other income	0	(191)
Proceeds from repayments	(632)	0
Proceeds from sales	0	(1,400)
Change in fair value	197	0
Ocwen Transaction	0	569
Ending balance	2,532	2,913
Ocwen
Carrying Value of Investments in Excess MSRs
Beginning balance	638,567	784,227
Purchases	0	(71,982)
Interest income	0	0
Other income	40,417	56,851
Proceeds from repayments	(26,946)	1,993
Proceeds from sales	0	(130,122)
Change in fair value	(40,417)	0
Ocwen Transaction	(611,621)	(2,400)
Ending balance	$ 0	$ 638,567