Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (66,353)	$ (293,379)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock based compensation	939	552
Discount accretion on U.S. Treasury Bills	(521)	0
Realized losses on mortgage-backed securities	0	132,672
Unrealized losses on mortgage-backed securities and U.S. Treasury securities	224,576	692,781
Realized and unrealized gains on derivative instruments	(111,100)	(261,364)
Changes in operating assets and liabilities:
Accrued interest receivable	(5,797)	8,332
Other assets	(108)	(353)
Accrued interest payable	6,627	3,636
Other liabilities	441	7,770
Due to affiliates	121	13
NET CASH PROVIDED BY OPERATING ACTIVITIES	48,825	290,660
CASH FLOWS FROM INVESTING ACTIVITIES:
Net proceeds from derivative instruments	114,494	246,321
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(1,151,718)	2,731,452
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from repurchase agreements	27,780,008	32,427,448
Principal payments on repurchase agreements	(26,731,506)	(35,537,693)
Cash dividends	(59,762)	(76,527)
Proceeds from issuance of common stock, net of issuance costs	159,438	0
Common stock repurchases, including shares withheld from employee stock awards for payment of taxes	(4,287)	(4,830)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	1,143,891	(3,191,602)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	40,998	(169,490)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of the period	237,219	450,442
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of the period	278,217	280,952
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	142,965	28,560
Collateralized Mortgage-Backed Securities [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases	(1,443,827)	(622,535)
Sales and maturities	0	2,731,497
Principal repayments	237,904	376,169
US Treasury Securities [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases	(97,789)	0
Proceeds from maturity of U.S. Treasury securities	$ 37,500	$ 0