Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities		$ 58,832	$ 82,480
Cash Flows from Investing Activities:
Purchase of securities		(1,770,962)	(1,189,684)
Purchase of loans		(1,225,176)	(548,104)
Capital improvements of real estate owned		(2,205)	(153)
Proceeds from disposition of securities		1,090,836	1,830,612
Proceeds from disposition of loans		1,064	8,006
Contributions to investments in unconsolidated entities		(9,171)	(19,711)
Distributions from investments in unconsolidated entities		119,395	17,181
Proceeds from disposition of real estate owned		1,335	7,801
Proceeds from principal payments of securities		357,692	284,242
Proceeds from principal payments of loans		225,426	337,748
Proceeds from investments sold short		377,784	264,267
Repurchase of securities sold short		(384,275)	(292,105)
Payments on financial derivatives		(41,821)	(99,800)
Proceeds from financial derivatives		41,283	68,546
Payments made on reverse repurchase agreements		(15,049,417)	(6,659,967)
Proceeds from reverse repurchase agreements		15,046,818	6,686,565
Due from brokers, net		(628)	12,376
Due to brokers, net		(82)	5,641
Net cash provided by (used in) investing activities		(1,222,104)	713,461
Cash flows provided by (used in) financing activities:
Net proceeds from issuance of common stock	[1]	141,619	95,537
Offering costs paid		(482)	(253)
Repurchase of common stock		0	(3,056)
Dividends paid		(58,469)	(50,642)
Contributions from non-controlling interests		10,744	9,134
Distributions to non-controlling interests		(20,342)	(7,961)
Proceeds from issuance of other secured borrowings		64,837	45,963
Principal payments on other secured borrowings		(25,718)	(59,893)
Borrowings under repurchase agreements		4,131,514	3,445,412
Repayments of repurchase agreements		(3,482,991)	(4,423,440)
Proceeds from Issuance of Other Secured Borrowings, at fair value		534,477	205,357
Repayments of Other secured borrowings, at fair value		(111,529)	0
Due from brokers, net		(26,700)	2,620
Due to brokers, net		(1,718)	(238)
Net cash provided by (used in) financing activities		1,155,242	(741,460)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		(8,030)	54,481
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period		111,822	72,477
Cash, Cash Equivalents, and Restricted Cash, End of Period		103,792	126,958
Supplemental disclosure of cash flow information:
Interest paid		34,531	54,958
Income tax paid		2,485	505
Dividends payable		9,149	5,299
Shares issued in connection with incentive fee payment (non-cash)		716	531
Contribution from non-controlling interest (non-cash)		0	2,340
Distributions to non-controlling interests		0	(2,340)
Transfers from mortgage loans to real estate owned (non-cash)		14,033	2,198
Transfers from mortgage loans to investments in non-consolidated entities (non-cash)		82,837	10,833
Purchase of Loans Non Cash		800	6,270
Principal payments on Other secured borrowings, at fair value (non-cash)		(341,503)	(138,608)
Proceeds received from Other secured borrowings, at fair value (non-cash)		40,670	27,735
Proceeds from issuance of Other secured borrowings (non-cash)		800	6,270
Proceeds from principal payments of investments (non-cash)		341,503	138,608
Repayments of repurchase agreement (non-cash)		$ (39,618)	$ (27,288)

[1] Net of underwriters' discounts and commissions.