CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (46,234)	$ (42,427)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	429	114
Realized and unrealized (gains) losses on mortgage-backed securities	102,192	(12,252)
Derivative, Gain (Loss) on Derivative, Net	(13,483)	74,822
Changes in operating assets and liabilities
Accrued interest receivable	(2,826)	2,163
Other assets	(172)	(580)
Accrued interest payable	(115)	(10,395)
Other liabilities	(1,305)	671
Due to affiliates	162	(53)
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	38,648	12,063
From mortgage-backed securities investments
Purchases	(2,986,864)	(1,985,756)
Sales	1,680,903	2,023,334
Principal repayments	259,425	260,834
Proceeds from U.S. Treasury Securities	0	139,712
Net payments on reverse repurchase agreements	0	(139,738)
Payments on net settlement of to-be-announced securities	(3,077)	(6,888)
Purchase of interest rate swaptions, net of margin cash received	14,369	64,190
NET CASH USED IN INVESTING ACTIVITIES	(1,063,982)	227,308
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	13,582,422	20,879,112
Principal payments on repurchase agreements	(12,663,304)	(21,152,479)
Cash dividends	(34,927)	(28,008)
Proceeds From Issuance Of Common Stock, net of issuance costs	221,654	19,447
Payments Related To Tax Withholding For Share Based Compensation	299	68
NET CASH PROVIDED BY FINANCING ACTIVITIES	1,105,546	(281,996)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	80,212	(42,625)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	299,506	278,655
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	379,718	236,030
Cash paid during the period for:
Interest Paid	3,611	31,397
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	(4,838)	5,090
Swap [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	(12,650)	64,357
TBA Contracts [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	5,389	5,244
Interest Rate Floor [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	(1,384)	0
US Treasury Securities [Member]
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ 131