SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Gain (Loss) on Settlement of Investments, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Gain (loss) on sale of real estate securities, net	$ 13,096	$ 65,701	$ 52,657
Gain (loss) on sale of residential mortgage loans, net	33,335	0	0
Gain (loss) on settlement of derivatives	(44,563)	(36,210)	0
Gain (loss) on liquidated residential mortgage loans	(360)	3,645	0
Gain (loss) on sale of REO	(10,742)	(3,686)	0
Other gains (losses)	(7,973)	6,037	0
Gain on settlement of investments	$ (17,207)	$ 35,487	$ 52,657