INVESTMENTS IN SERVICER ADVANCES - Summary of Investments in Servicer Advances (Details) - Corporate Joint Venture [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Investments in and Advances to Affiliates [Line Items]
Amortized Cost Basis	[1]	$ 5,687,635	$ 7,400,068
Carrying Value	[1],[2]	$ 5,706,593	$ 7,426,794
Weighted Average Discount Rate	[1]	5.60%	5.60%
Weighted Average Yield	[1]	5.50%	5.50%
Weighted Average Life (Years)	[1],[3]	4 years 7 months 1 day	4 years 5 months 9 days
Change in Fair Value Recorded in Other Income for Year then Ended	[1]	$ (7,768)	$ (57,491)
Face amount		100,000	431,000
Aggregate carrying value		$ 100,100	$ 430,300

[1] Excludes asset-backed securities collateralized by Servicer Advances, which have aggregate face amounts of $100.0 million and $431.0 million and aggregate carrying values of $100.1 million and $430.3 million as of December 31, 2016 and 2015, respectively. See Note 7 for details related to these securities.

[2] Carrying value represents the fair value of the investments in Servicer Advances, including the basic fee component of the related MSRs.

[3] Weighted Average Life represents the weighted average expected timing of the receipt of expected net cash flows for this investment.