CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited)	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 10,597,000	$ (16,377,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	83,000	80,000
Realized and unrealized (gains) losses on mortgage-backed securities	(18,284,000)	80,050,000
Derivative, Gain (Loss) on Derivative, Net	7,541,000	(21,700,000)
Changes in operating assets and liabilities
Accrued interest receivable	696,000	(1,105,000)
Other assets	(339,000)	(251,000)
Accrued interest payable	(1,299,000)	636,000
Other liabilities	(477,000)	218,000
Due to affiliates	(113,000)	(1,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(1,595,000)	41,550,000
From mortgage-backed securities investments
Purchases	(547,417,000)	(517,829,000)
Sales	655,359,000	228,691,000
Principal repayments	94,785,000	78,720,000
Payments on net settlement of to-be-announced securities	(11,146,000)	9,161,000
Purchase of interest rate swaptions, net of margin cash received	8,723,000	(10,622,000)
NET CASH USED IN INVESTING ACTIVITIES	182,858,000	(190,635,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	11,573,937,000	13,098,449,000
Principal payments on repurchase agreements	(11,732,251,000)	(13,012,955,000)
Cash dividends	(11,760,000)	(19,116,000)
Proceeds From Issuance Of Common Stock, net of issuance costs	8,503,000	0
Payments For Repurchase Of Common Stock	3,024,000	0
NET CASH PROVIDED BY FINANCING ACTIVITIES	(164,595,000)	66,378,000
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	16,668,000	(82,707,000)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	126,263,000	246,712,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	142,931,000	164,005,000
Cash paid during the period for:
Interest Paid	20,190,000	14,513,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Securities acquired settled in later period	35,026,000	32,054,000
Securities Sold Settled In Later Period	0	159,300,000
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	378,000	(1,717,000)
Swap [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	2,522,000	(11,576,000)
TBA Contracts [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	$ 4,641,000	$ (8,407,000)