CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 14,130,000	$ (15,030,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	158,000	323,000
Realized and unrealized (gains) losses on mortgage-backed securities	(44,902,000)	112,642,000
Derivative, Gain (Loss) on Derivative, Net	43,257,000	(27,210,000)
Changes in operating assets and liabilities
Accrued interest receivable	(624,000)	(327,000)
Other assets	162,000	(269,000)
Accrued interest payable	3,609,000	705,000
Other liabilities	(116,000)	6,716,000
Due to affiliates	(100,000)	(141,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	15,574,000	77,409,000
From mortgage-backed securities investments
Purchases	(2,164,094,000)	(1,995,208,000)
Sales	1,689,747,000	1,757,652,000
Principal repayments	229,633,000	180,169,000
Payments on net settlement of to-be-announced securities	(10,559,000)	12,493,000
Purchase of interest rate swaptions, net of margin cash received	19,649,000	(14,768,000)
NET CASH USED IN INVESTING ACTIVITIES	(274,922,000)	(30,126,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	22,265,665,000	26,040,287,000
Principal payments on repurchase agreements	(21,961,190,000)	(26,124,219,000)
Cash dividends	(24,271,000)	(33,370,000)
Proceeds From Issuance Of Common Stock, net of issuance costs	36,998,000	0
Payments For Repurchase Of Common Stock	3,024,000	7,681,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	314,178,000	(124,983,000)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	54,830,000	(77,700,000)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	126,263,000	246,712,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	181,093,000	169,012,000
Cash paid during the period for:
Interest Paid	37,713,000	31,023,000
Interest Rate Swaption [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	1,063,000	(4,434,000)
Swap [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	35,869,000	(12,805,000)
TBA Contracts [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	$ 6,325,000	$ (9,971,000)