CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited)	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (91,199,000)	$ 10,597,000
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	59,000	87,000
Realized and unrealized (gains) losses on mortgage-backed securities	25,348,000	(18,284,000)
Derivative, Gain (Loss) on Derivative, Net	64,613,000	7,541,000
Changes in operating assets and liabilities
Accrued interest receivable	2,350,000	696,000
Other assets	(655,000)	(339,000)
Accrued interest payable	(7,287,000)	(1,299,000)
Other liabilities	(223,000)	(477,000)
Due to affiliates	(102,000)	(113,000)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(7,096,000)	(1,591,000)
From mortgage-backed securities investments
Purchases	(1,334,350,000)	(547,417,000)
Sales	1,808,867,000	655,359,000
Principal repayments	142,259,000	94,785,000
Payments on net settlement of to-be-announced securities	(7,602,000)	(11,146,000)
Purchase of interest rate swaptions, net of margin cash received	45,458,000	8,723,000
NET CASH USED IN INVESTING ACTIVITIES	563,716,000	182,858,000
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	13,602,710,000	11,573,937,000
Principal payments on repurchase agreements	(14,240,566,000)	(11,732,251,000)
Cash dividends	(15,416,000)	(11,758,000)
Proceeds From Issuance Of Common Stock, net of issuance costs	19,447,000	8,503,000
Payments For Repurchase Of Common Stock	0	3,030,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	(633,825,000)	(164,599,000)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(77,205,000)	16,668,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	278,655,000	126,263,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	201,450,000	142,931,000
Cash paid during the period for:
Interest Paid	23,809,000	20,190,000
SUPPLEMENTAL DISCLOSURES OF NONCASH FINANCING ACTIVITIES:
Securities acquired settled in later period	3,450,000	35,026,000
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	2,589,000	378,000
Swap [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	54,934,000	2,522,000
TBA Contracts [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	$ 7,090,000	$ 4,641,000