INVESTMENTS IN SERVICER ADVANCES - Summary of Investments in Servicer Advances (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended			12 Months Ended
		Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Carrying Value		$ 7,499,775			$ 7,499,775			$ 3,270,839
Servicer Advance Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Amortized Cost Basis		7,417,372	[1]		7,417,372	[1]		3,186,622
Carrying Value	[2]	$ 7,499,775	[1]		$ 7,499,775	[1]		$ 3,270,839
Weighted Average Discount Rate		5.50%	[1]		5.50%	[1]		5.40%
Weighted Average Yield		5.60%	[1]		5.60%	[1]		5.80%
Weighted Average Life (Years)	[3]				4 years 3 months 6 days	[1]		4 years
Changes in Fair Value Recorded in Other Income		$ (18,738)		$ 22,948	$ (1,845)		$ 105,825

[1] Excludes an asset-backed security collateralized by servicer advances purchased during the third quarter of 2015. This security had a face amount of $122.0 million and was purchased for $122.0 million. See Note 7 for details related to this security.

[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.