Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net loss (income)	$ (98,479,000)	$ (52,214,000)
Adjustments to reconcile net loss to cash provided by operating activities:
Decrease (increase) in accrued interest receivable	3,105,000	(5,056,000)
(Decrease) increase in accrued interest payable	(5,979,000)	2,631,000
Loss on derivative instruments, net	195,567,000	61,697,000
Gain on sale of investments, net	(84,783,000)	0
Fair value adjustments, net	372,000	13,000
Amortization of investment premiums, net	33,118,000	31,083,000
Other amortization and depreciation, net	499,000	222,000
Stock-based compensation expense	307,000	298,000
Change in other assets and liabilities, net	254,000	1,625,000
Net cash and cash equivalents provided by operating activities	43,981,000	40,299,000
Investing activities:
Purchase of investments	(155,594,000)	(1,019,100,000)
Principal payments received on investments	140,032,000	73,817,000
Proceeds from sales of investments	487,464,000	0
Principal payments received on mortgage loans held for investment	615,000	646,000
Net payments on derivatives, including terminations	(187,822,000)	(62,382,000)
Other investing activities	0	(102,000)
Net cash and cash equivalents provided by (used in) investing activities	284,695,000	(1,007,121,000)
Financing activities:
Borrowings under repurchase agreements	16,555,552,000	32,608,826,000
Repayments of repurchase agreement borrowings	(16,899,794,000)	(31,623,917,000)
Principal payments on non-recourse collateralized financing	(569,000)	(242,000)
Proceeds from issuance of preferred stock	107,988,000	5,015,000
Proceeds from issuance of common stock	0	53,872,000
Payments for Repurchase of Redeemable Preferred Stock	100,000,000	0
Cash paid for stock issuance costs	0	(185,000)
Payments for Repurchase of Common Stock	206,000	0
Payments related to tax withholding for stock-based compensation	(235,000)	(296,000)
Dividends paid	(15,027,000)	(22,292,000)
Net cash and cash equivalents (used in) provided by financing activities	(352,291,000)	1,020,781,000
Net (decrease) increase in cash, cash equivalents, and restricted cash	(23,615,000)	53,959,000
Cash, cash equivalents, and restricted cash at beginning of period	134,230,000	88,704,000
Cash, cash equivalents, and restricted cash at end of period	110,615,000	142,663,000
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 28,074,000	$ 23,807,000