CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities:
Net income (loss)	$ (425,710)	$ 176,907
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Accretion) amortization of investment discounts/premiums, net	60,974	29,557
Accretion (amortization) of deferred financing costs, debt issuance costs, and securitized debt discounts/premiums, net	(35,148)	(14,327)
Amortization of swaption premium	0	559
Net unrealized losses (gains) on derivatives	(201,000)	221,486
Margin (paid) received on derivatives	325,594	(157,052)
Net unrealized losses (gains) on financial instruments at fair value	432,809	(391,561)
Net realized losses (gains) on sales of investments	(102,234)	(1,077)
Net increase (decrease) in provision for credit losses	1,817	0
Net other-than-temporary credit impairment losses	0	4,853
(Gain) loss on extinguishment of debt	(459)	608
Equity-based compensation expense	2,534	6,621
Changes in operating assets:
Decrease (increase) in accrued interest receivable, net	27,718	2,048
Decrease (increase) in other assets	(56,146)	(2,166)
Changes in operating liabilities:
Increase (decrease) in accounts payable and other liabilities	12,123	2,646
Increase (decrease) in accrued interest payable, net	(24,765)	(26,156)
Net cash provided by (used in) operating activities	18,107	(147,054)
Cash Flows From Investing Activities:
Net cash provided by (used in) investing activities	7,028,991	462,090
Cash Flows From Financing Activities:
Proceeds from secured financing agreements	57,804,851	57,358,115
Payments on secured financing agreements	(65,275,151)	(56,874,303)
Net proceeds from preferred stock offerings	0	193,368
Payments on repurchase of common stock	(22,066)	0
Proceeds from securitized debt borrowings, collateralized by loans held for investment	1,462,500	0
Payments on securitized debt borrowings, collateralized by loans held for investment	(920,083)	(748,949)
Payments on securitized debt borrowings, collateralized by Non-Agency RMBS	(8,445)	(13,792)
Net proceeds from issuance of convertible debt	361,139	0
Purchase of capped call	(33,750)	0
Common dividends paid	(186,543)	(187,098)
Preferred dividends paid	(36,875)	(35,829)
Net cash provided by (used in) financing activities	(6,854,423)	(308,488)
Net increase (decrease) in cash and cash equivalents	192,675	6,548
Cash and cash equivalents at beginning of period	109,878	47,486
Cash and cash equivalents at end of period	302,553	54,034
Supplemental disclosure of cash flow information:
Interest received	634,199	721,909
Interest paid	328,753	441,557
Non-cash investing activities:
Payable for investments purchased	246,770	921,507
Receivable for investments sold	0	75,059
Net change in unrealized gain (loss) on available-for sale securities	(170,826)	112,258
Retained beneficial interests	0	74,339
Non-cash financing activities:
Dividends declared, not yet paid	75,554	97,091
Conversion of convertible debt	289,331	0
Agency MBS portfolio
Cash Flows From Investing Activities:
Purchases	(292,379)	(2,374,316)
Sales	6,466,990	1,919,230
Principal payments	596,564	605,724
Non-agency RMBS Portfolio
Cash Flows From Investing Activities:
Purchases	(19,503)	(265,062)
Sales	141,912	5,167
Principal payments	124,351	196,261
Loans held for investment
Cash Flows From Investing Activities:
Sales	0	705,653
Principal payments	895,764	806,677
Purchases	$ (884,708)	$ (1,137,244)