DERIVATIVES - Schedule of Derivatives - Gain (Losses) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Unrealized gain (loss) on derivative instruments	[1]	$ (13,163)	$ (1,229)	$ (35,466)	$ (8,259)
Gain (loss) on settlement of derivatives		(12,835)	13,769	(45,468)	(8,821)
Total income (losses)		(25,998)	12,540	(80,934)	(17,080)
TBAs [Member]
Derivative [Line Items]
Unrealized gain (loss) on derivative instruments	[1]	(4,993)	1,754	(10,524)	(1,800)
Gain (loss) on settlement of derivatives		(11,066)	12,529	(39,237)	(3,504)
Interest Rate Swap [Member]
Derivative [Line Items]
Unrealized gain (loss) on derivative instruments	[1]	(4,975)	(1,737)	(20,796)	(5,089)
Gain (loss) on settlement of derivatives		(1,769)	1,240	(5,107)	(5,317)
Interest Rate Caps [Member]
Derivative [Line Items]
Unrealized gain (loss) on derivative instruments	[1]	(3,195)	(1,246)	(4,146)	(1,370)
Gain (loss) on settlement of derivatives		$ 0	$ 0	$ (1,124)	$ 0

[1] Represents unrealized gains (losses).