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, 2017	Dec. 31, 2016
Carrying Value of Investments in Excess MSRs
Beginning balance	$ 1,399,455	$ 1,581,517
Purchases	0	124
Interest income	103,053	150,141
Other income	4,377	2,802
Proceeds from repayments	(252,007)	(327,832)
Proceeds from sales	(13,505)
Change in fair value	4,322	(7,297)
Ocwen Transaction	(71,982)
Ending balance	1,173,713	1,399,455
Nationstar
Carrying Value of Investments in Excess MSRs
Beginning balance	611,293	698,304
Purchases	0	0
Interest income	46,393	63,772
Other income	2,384	2,802
Proceeds from repayments	(120,485)	(145,186)
Proceeds from sales	(13,505)
Change in fair value	6,153	(8,399)
Ocwen Transaction	0
Ending balance	532,233	611,293
SLS
Carrying Value of Investments in Excess MSRs
Beginning balance	3,935	5,307
Purchases	0	124
Interest income	(191)	(244)
Other income	0	0
Proceeds from repayments	(1,400)	(1,015)
Proceeds from sales	0
Change in fair value	569	(237)
Ocwen Transaction	0
Ending balance	2,913	3,935
Ocwen
Carrying Value of Investments in Excess MSRs
Beginning balance	784,227	877,906
Purchases	0	0
Interest income	56,851	86,613
Other income	1,993	0
Proceeds from repayments	(130,122)	(181,631)
Proceeds from sales	0
Change in fair value	(2,400)	1,339
Ocwen Transaction	(71,982)
Ending balance	$ 638,567	$ 784,227