Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net (loss) income	$ (207,803)	$ 85,545
Adjustments to reconcile net (loss) income to cash provided by operating activities:
(Increase) decrease in accrued interest receivable	(3,075)	244
(Decrease) increase in accrued interest payable	(3,122)	1,942
Loss (gain) on derivative instruments, net	229,941	(78,520)
Loss on sale of investments, net	5,755	17,945
Fair value adjustments, net	42	(68)
Amortization of investment premiums, net	98,327	110,501
Other amortization and depreciation, net	1,186	937
Stock-based compensation expense	899	930
Change in other assets and liabilities, net	(6)	(896)
Net cash and cash equivalents provided by operating activities	122,144	138,560
Investing activities:
Purchase of investments	(2,833,348)	(1,080,485)
Principal payments received on investments	347,565	137,362
Proceeds from sales of investments	1,033,066	642,900
Principal payments received on mortgage loans held for investment, net	1,677	3,375
Net (payments) receipts on derivatives, including terminations	(229,001)	80,618
Other investing activities	(183)	(72)
Net cash and cash equivalents used in investing activities	(1,680,224)	(216,302)
Financing activities:
Borrowings under repurchase agreements	93,107,875	76,890,349
Repayments of repurchase agreement borrowings	(91,502,990)	(76,765,393)
Principal payments on non-recourse collateralized financing	(517)	(1,838)
Proceeds from issuance of preferred stock	19,924	1,290
Proceeds from issuance of common stock	63,889	19,281
Cash paid for stock issuance costs	(185)	(10)
Cash paid for common stock repurchases	(25,034)	0
Payments related to tax withholding for stock-based compensation	(296)	(364)
Dividends paid	(54,355)	(39,188)
Net cash and cash equivalents provided by financing activities	1,608,311	104,127
Net increase in cash, cash equivalents, and restricted cash	50,231	26,385
Cash, cash equivalents, and restricted cash at beginning of period	88,704	87,200
Cash, cash equivalents, and restricted cash at end of period	138,935	113,585
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 91,624	$ 38,713