Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (6,738,000)	$ 20,999,000
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	364,000	118,000
Realized and unrealized (gains) losses on mortgage-backed securities	10,102,000	(10,651,000)
Realized and unrealized loss on interest rate swaption	1,217,000	1,120,000
Gains On TBA Securities	(24,000)	0
Changes in operating assets and liabilities
Accrued interest receivable	(1,973,000)	(4,006,000)
Other assets	(488,000)	(253,000)
Accrued interest payable	(176,000)	296,000
Other liabilities	9,000	532,000
Due to affiliates	89,000	221,000
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	2,382,000	8,376,000
From mortgage-backed securities investments
Purchases	(2,106,110,000)	(1,521,606,000)
Sales	1,364,754,000	470,012,000
Principal repayments	166,910,000	52,335,000
Increase in restricted cash	(3,444,000)	(5,335,000)
Proceeds From Net TBA Settlements	24,000	0
Purchase of interest rate swaptions, net of margin cash received	1,364,000	1,250,000
NET CASH USED IN INVESTING ACTIVITIES	(579,230,000)	(1,005,844,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	13,608,591,000	5,306,416,000
Principal payments on repurchase agreements	(13,101,943,000)	(4,368,995,000)
Cash dividends	(29,598,000)	(14,544,000)
Stock Issued During Period, Value, New Issues	(83,275,000)	(121,449,000)
Common stock repurchases	(9,512,000)	0
NET CASH PROVIDED BY FINANCING ACTIVITIES	550,813,000	1,044,326,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	(26,035,000)	46,858,000
CASH AND CASH EQUIVALENTS, beginning of the period	93,137,000	8,169,000
CASH AND CASH EQUIVALENTS, end of the period	67,102,000	55,027,000
Cash paid during the period for:
Interest	5,076,000	1,608,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Securities acquired settled in later period	92,325,000	66,812,000
Securities sold settled in later period	$ 87,558,000	$ 249,410,000