Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net income	$ 85,545	$ 11,931
Adjustments to reconcile net income to cash provided by operating activities:
Decrease in accrued interest receivable	244	1,129
Increase (decrease) in accrued interest payable	1,942	(436)
(Gain) loss on derivative instruments, net	(78,520)	9,634
Loss on sale of investments, net	17,945	10,628
Fair value adjustments, net	(68)	(63)
Amortization of investment premiums, net	110,501	122,621
Other amortization and depreciation, net	937	983
Stock-based compensation expense	930	1,567
Change in other assets and liabilities, net	(896)	(1,905)
Net cash and cash equivalents provided by operating activities	138,560	156,089
Investing activities:
Purchase of investments	(1,080,485)	(772,590)
Principal payments received on investments	137,362	248,298
Proceeds from sales of investments	642,900	792,984
Principal payments received on mortgage loans held for investment, net	3,375	2,641
Net receipts on derivatives, including terminations	80,618	11,743
Other investing activities	(72)	(214)
Net cash and cash equivalents provided by investing activities	(216,302)	282,862
Financing activities:
Borrowings under repurchase agreements	76,890,349	60,229,426
Repayments of repurchase agreement borrowings	(76,765,393)	(60,609,148)
Principal payments on non-recourse collateralized financing	(1,838)	(747)
Proceeds from issuance of preferred stock	1,290	25,884
Proceeds from issuance of common stock	19,281	14,495
Cash paid for stock issuance costs	(10)	(61)
Payments related to tax withholding for stock-based compensation	(364)	(521)
Dividends paid	(39,188)	(35,479)
Net cash and cash equivalents used in financing activities	104,127	(376,151)
Net increase in cash, cash equivalents, and restricted cash	26,385	62,800
Cash, cash equivalents, and restricted cash at beginning of period	87,200	98,889
Cash, cash equivalents, and restricted cash at end of period	113,585	161,689
Supplemental Disclosure of Cash Activity:
Cash paid for interest	$ 38,713	$ 26,766