CONSOLIDATED STATEMENTS OF CASH FLOWS, (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (293,379,000)	$ (20,196,000)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Stock based compensation and equity plan amortization	552,000	612,000
Realized and unrealized (gains) losses on mortgage-backed securities	132,672,000	3,068,000
Marketable Securities, Unrealized Gain (Loss)	(692,781,000)	(107,386,000)
Derivative, Gain (Loss) on Derivative, Net	(261,364,000)	(22,180,000)
Changes in operating assets and liabilities
Accrued interest receivable	8,332,000	(5,449,000)
Other assets	(353,000)	74,000
Accrued interest payable	3,636,000	(404,000)
Other liabilities	7,770,000	(2,031,000)
Due to affiliates	13,000	303,000
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	290,660,000	61,183,000
From mortgage-backed securities investments
Purchases	(622,535,000)	(4,816,301,000)
Sales	2,731,497,000	2,598,893,000
Principal repayments	376,169,000	413,005,000
Purchases of U.S. Treasury Securities	0	(37,440,000)
Note proceeds from (payments on) derivative instruments	(246,321,000)	1,228,000
NET CASH USED IN INVESTING ACTIVITIES	2,731,452,000	(1,843,071,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from repurchase agreements	32,427,448,000	22,995,280,000
Principal payments on repurchase agreements	(35,537,693,000)	(21,376,997,000)
Cash dividends	(76,527,000)	(59,019,000)
Proceeds From Issuance Of Common Stock, net of issuance costs	0	398,661,000
Payments For Repurchase Of Common Stock	4,602,000	0
Shares withheld from employee stock awards for payment of taxes	228,000	299,000
NET CASH PROVIDED BY FINANCING ACTIVITIES	(3,191,602,000)	1,957,626,000
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(169,490,000)	175,738,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	450,442,000	299,506,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	280,952,000	475,244,000
Cash paid during the period for:
Interest Paid	28,560,000	5,471,000
Other Noncash Investing And Financing Items Abstract
Securities Acquisitions Settled In Later Period	$ 0	$ 180,619,000