Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income	$ 59,959	$ 1,619
Adjustments to reconcile net income to cash provided by operating activities:
Decrease in accrued interest receivable	493	1,101
Increase (decrease) in accrued interest payable	1,735	(1,633)
(Gain) loss on derivative instruments, net	(59,021)	15,627
Loss on sale of investments, net	16,219	5,417
Fair value adjustments, net	(56)	(40)
Amortization of investment premiums, net	74,136	81,188
Other amortization and depreciation, net	625	682
Stock-based compensation expense	629	1,179
Change in other assets and liabilities, net	(1,744)	(2,120)
Net cash and cash equivalents provided by operating activities	92,975	103,020
Investing activities:
Purchase of investments	(567,704)	(282,943)
Principal payments received on investments	95,452	183,636
Proceeds from sales of investments	525,973	399,483
Principal payments received on mortgage loans held for investment, net	2,101	1,876
Net receipts on derivatives, including terminations	54,050	7,405
Other investing activities	(68)	(212)
Net cash and cash equivalents provided by investing activities	109,804	309,245
Financing activities:
Borrowings under repurchase agreements	54,577,482	39,007,126
Repayments of repurchase agreement borrowings	(54,628,400)	(39,365,319)
Principal payments on non-recourse collateralized financing	(1,144)	(557)
Proceeds from issuance of preferred stock	494	18,212
Proceeds from issuance of common stock	5,914	139
Cash paid for stock issuance costs	0	(52)
Payments related to tax withholding for stock-based compensation	(364)	(521)
Dividends paid	(26,003)	(23,942)
Net cash and cash equivalents used in financing activities	(72,021)	(364,914)
Net increase in cash, cash equivalents, and restricted cash	130,758	47,351
Cash, cash equivalents, and restricted cash at beginning of period	87,200	98,889
Cash, cash equivalents, and restricted cash at end of period	217,958	146,240
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 24,114	$ 18,029