Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
GAAP net income (loss)	$ 65,880	$ (179,168)	$ 32,046	$ (167,565)
Book to tax differences:
TRS income	(99)	(18)	0	(15)
Premium amortization expense	0	0	0	(1)
Agency Securities	(306,142)	468,280	(55,522)	505,573
U.S. Treasury Securities	21,695	(5,438)	(8,376)	(5,517)
Changes in interest rate contracts	274,030	(231,890)	185,737	(191,071)
Security Sales	0	0	0	7,471
Amortization of deferred hedging costs	(20,025)	(24,019)	(62,339)	(80,590)
Amortization of deferred Treasury Future gains	4,140	5,570	13,465	17,447
Other	517	495	1,699	1,274
Estimated REIT taxable income	$ 39,996	$ 33,812	$ 106,710	$ 87,006