Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net income	$ 117,209	$ 117,929
Adjustments to reconcile net income to cash provided by operating activities:
Realized gain on sale of investments, net	0	(4,697)
Unrealized loss on investments, net	111,251	980
Gain on derivative instruments, net	(220,211)	(107,801)
Amortization of investment premiums, net	27,104	30,161
Other amortization and depreciation, net	566	599
Share-based compensation expense	846	452
Increase in accrued interest receivable	(1,730)	(1,092)
Increase (decrease) in accrued interest payable	159	(992)
Change in other assets and liabilities, net	(642)	(5,350)
Net cash provided by operating activities	34,552	30,189
Investing activities:
Purchase of investments	(349,839)	(68,543)
Principal payments received on investments	86,863	118,022
Proceeds from sales of investments	0	220,194
Principal payments received on mortgage loans held for investment	512	488
Net receipts on derivatives, including terminations	259,180	78,509
Increase in cash collateral posted by counterparties	28,442	49,665
Net cash provided by investing activities	25,158	398,335
Financing activities:
Borrowings under repurchase agreements	2,197,547	4,494,067
Repayments of repurchase agreement borrowings	(2,094,661)	(4,899,141)
Principal payments on non-recourse collateralized financing	0	(118)
Proceeds from issuance of common stock	4,245	128,150
Cash paid for redemption of preferred stock	0	(69,708)
Cash paid for stock issuance costs	0	(270)
Payments related to tax withholding for share-based compensation	(236)	(428)
Dividends paid	(16,223)	(13,320)
Net cash provided by (used in) financing activities	90,672	(360,768)
Net increase in cash including cash posted to counterparties	150,382	67,756
Cash including cash posted to counterparties at beginning of period	421,307	310,360
Cash including cash posted to counterparties at end of period	571,689	378,116
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 1,589	$ 2,619