Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss (income)	$ 96,359,000	$ (171,199,000)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Decrease (increase) in accrued interest receivable	9,589,000	(4,273,000)
(Decrease) increase in accrued interest payable	(14,678,000)	5,599,000
Loss on derivative instruments, net	204,130,000	179,233,000
(Gain) loss on sale of investments, net	(277,882,000)	10,360,000
Fair value adjustments, net	40,000	29,000
Amortization of investment premiums, net	63,789,000	63,239,000
Other amortization and depreciation, net	959,000	707,000
Stock-based compensation expense	731,000	593,000
Change in other assets and liabilities, net	432,000	642,000
Net cash and cash equivalents provided by operating activities	83,469,000	84,930,000
Investing activities:
Purchase of investments	(2,818,863,000)	(2,100,712,000)
Principal payments received on investments	249,766,000	195,061,000
Proceeds from sales of investments	4,226,321,000	432,552,000
Principal payments received on mortgage loans held for investment	1,519,000	1,199,000
Net payments on derivatives, including terminations	(210,712,000)	(174,023,000)
Other investing activities	0	(1,348,000)
Net cash and cash equivalents provided by (used in) investing activities	1,448,031,000	(1,647,271,000)
Financing activities:
Borrowings under repurchase agreements	23,686,649,000	60,627,601,000
Repayments of repurchase agreement borrowings	(25,124,006,000)	(59,080,133,000)
Principal payments on non-recourse collateralized financing	(1,467,000)	(386,000)
Proceeds from issuance of preferred stock	107,988,000	13,188,000
Proceeds from issuance of common stock	0	63,751,000
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	372,000	0
Payments related to tax withholding for stock-based compensation	(235,000)	(296,000)
Dividends paid	(27,894,000)	(38,553,000)
Net cash and cash equivalents (used in) provided by financing activities	(1,459,337,000)	1,584,987,000
Net increase in cash, cash equivalents, and restricted cash	72,163,000	22,646,000
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	206,393,000	111,350,000
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 41,613,000	$ 51,650,000