CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 357,116	$ 277,824
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Accretion) amortization of investment discounts/premiums, net	11,301	(8,397)
Accretion (amortization) of deferred financing costs and securitized debt discounts/premiums, net	(5,911)	8,433
Amortization of swaption premium	1,157	4,385
Net unrealized losses (gains) on derivatives	(107,314)	(10,698)
Margin (paid) received on derivatives	19,171	2,161
Net unrealized losses (gains) on financial instruments at fair value	3,898	(140,005)
Net realized losses (gains) on sales of investments	(2,167)	(9,708)
Net other-than-temporary credit impairment losses	10,289	32,210
(Gain) loss on extinguishment of debt	(10,057)	48,014
Equity-based compensation expense	4,766	1,603
Changes in operating assets:
Decrease (increase) in accrued interest receivable, net	(6,088)	(18,382)
Decrease (increase) in other assets	23,711	(7,121)
Changes in operating liabilities:
Increase (decrease) in accounts payable and other liabilities	(3,374)	(3,249)
Increase (decrease) in accrued interest payable, net	9,518	6,186
Net cash provided by (used in) operating activities	306,016	183,256
Cash Flows From Investing Activities:
Net cash provided by (used in) investing activities	(1,892,368)	(3,342,632)
Cash Flows From Financing Activities:
Proceeds from repurchase agreements	31,403,682	16,994,467
Payments on repurchase agreements	(29,525,962)	(16,341,218)
Net proceeds from preferred stock offerings	0	314,429
Payments on repurchase of common stock	(14,834)	0
Proceeds from securitized debt borrowings, collateralized by loans held for investment	1,170,009	3,532,918
Payments on securitized debt borrowings, collateralized by loans held for investment	(1,188,154)	(1,074,027)
Payments on securitized debt borrowings, collateralized by Non-Agency RMBS	(25,097)	(71,089)
Common dividends paid	(187,390)	(187,943)
Preferred dividends paid	(18,800)	(17,132)
Net cash provided by (used in) financing activities	1,613,454	3,150,405
Net increase (decrease) in cash and cash equivalents	27,102	(8,971)
Cash and cash equivalents at beginning of period	63,569	177,714
Cash and cash equivalents at end of period	90,671	168,743
Supplemental disclosure of cash flow information:
Interest received	608,779	513,210
Interest paid	306,911	233,568
Non-cash investing activities:
Payable for investments purchased	784,425	1,046,720
Net change in unrealized gain (loss) on available-for sale securities	(125,251)	62,177
Non-cash financing activities:
Common dividends declared, not yet paid	95,807	94,809
Agency MBS portfolio
Cash Flows From Investing Activities:
Purchases	(2,764,785)	(260,518)
Sales	172	141,191
Principal payments	205,093	220,882
Non-agency MBS
Cash Flows From Investing Activities:
Purchases	(70,043)	(5,663)
Sales	10,407	5,045
Principal payments	327,923	263,804
Loans held for investment:
Cash Flows From Investing Activities:
Sales	379,002	0
Purchases	(924,283)	(4,515,440)
Principal payments	$ 944,146	$ 808,067