CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net income	$ 162,807	$ 83,098
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Accretion) amortization of investment discounts/premiums, net	(13,712)	6,469
Accretion (amortization) of deferred financing costs and securitized debt discounts/premiums, net	5,109	2,581
Amortization of swaption premium	3,303	1,656
Net unrealized losses (gains) on derivatives	(4,896)	101,110
Margin (paid) received on derivatives	4,974	(98,958)
Net unrealized losses (gains) on financial instruments at fair value	(72,243)	(16,871)
Net realized losses (gains) on sales of investments	(5,167)	2,674
Net other-than-temporary credit impairment losses	18,701	10,678
(Gain) loss on extinguishment of debt	0	1,766
Equity-based compensation expense	1,119	102
Changes in operating assets:
Decrease (increase) in accrued interest receivable, net	(19,972)	1,194
Decrease (increase) in other assets	(30,275)	9,440
Changes in operating liabilities:
Increase (decrease) in accounts payable and other liabilities	(7,517)	(5,810)
Increase (decrease) in accrued interest payable, net	18,929	8,441
Net cash provided by (used in) operating activities	61,160	107,570
Cash Flows From Investing Activities:
Net cash provided by (used in) investing activities	(3,716,567)	180,698
Cash Flows From Financing Activities:
Proceeds from repurchase agreements	6,551,098	7,897,654
Payments on repurchase agreements	(6,300,798)	(7,791,362)
Net proceeds from preferred stock offerings	314,429	0
Proceeds from securitized debt borrowings, collateralized by loans held for investment	3,457,535	98,263
Payments on securitized debt borrowings, collateralized by loans held for investment	(331,290)	(197,595)
Payments on securitized debt borrowings, collateralized by Non-Agency RMBS	(31,320)	(34,880)
Common dividends paid	(94,056)	(183,957)
Preferred dividends paid	(5,349)	0
Net cash provided by (used in) financing activities	3,560,249	(211,877)
Net increase (decrease) in cash and cash equivalents	(95,158)	76,391
Cash and cash equivalents at beginning of period	177,714	114,062
Cash and cash equivalents at end of period	82,556	190,453
Supplemental disclosure of cash flow information:
Interest received	217,660	208,857
Interest paid	86,193	51,959
Non-cash investing activities:
Payable for investments purchased	473,269	582,875
Net change in unrealized gain (loss) on available-for sale securities	9,605	68,474
Non-cash financing activities:
Common dividends declared, not yet paid	94,625	90,367
Agency MBS - Residential
Cash Flows From Investing Activities:
Purchases	(113,599)	(441,308)
Sales	0	270,196
Principal payments	115,237	123,590
Non-agency MBS
Cash Flows From Investing Activities:
Purchases	(5,663)	(41,947)
Sales	0	283
Principal payments	127,929	124,013
Securitized Loans
Cash Flows From Investing Activities:
Purchases	(4,165,322)	0
Principal payments	$ 324,851	$ 145,871