Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Cash flows provided by (used in) operating activities:
Shares issued in connection with incentive fee payment (non-cash)		$ 325	$ 0
Share-based Payment Arrangement, Noncash Expense		288	0
Net cash provided by (used in) operating activities		32,931	9,164
Cash Flows from Investing Activities:
Purchase of securities		(388,759)	(761,382)
Purchase of loans		(1,003,464)	(302,567)
Capital improvements of real estate owned		0	(473)
Proceeds from disposition of securities		412,385	285,767
Proceeds from disposition of loans		19,520	0
Contributions to investments in unconsolidated entities		(2,678)	200
Distributions from investments in unconsolidated entities		110,042	12,971
Proceeds from disposition of real estate owned		499	336
Proceeds from principal payments of securities		93,950	108,082
Proceeds from principal payments of loans		143,039	53,586
Proceeds from investments sold short		327,126	86,373
Repurchase of securities sold short		(358,377)	(25,219)
Payments on financial derivatives		(17,257)	(14,566)
Proceeds from financial derivatives		40,427	18,138
Payments made on reverse repurchase agreements		(8,765,502)	(1,866,265)
Proceeds from reverse repurchase agreements		8,757,165	1,806,591
Due from brokers, net		16,941	6,044
Due to brokers, net		22,484	2,088
Net cash provided by (used in) investing activities		(592,459)	(590,296)
Cash flows provided by (used in) financing activities:
Net proceeds from issuance of common stock	[1]	38,524	0
Proceeds from Issuance of Preferred Stock and Preference Stock	[1]	506	0
Offering costs paid		(540)	0
Dividends paid		(29,105)	(15,273)
Contributions from non-controlling interests		6,424	1,159
Distributions to non-controlling interests		(9,181)	(5,923)
Proceeds from issuance of other secured borrowings		11,632	20,634
Principal payments on other secured borrowings		(16,593)	(7,990)
Borrowings under repurchase agreements		2,210,217	1,495,139
Repayments of repurchase agreements		(1,918,489)	(1,043,777)
Proceeds from Issuance of Unsecured Debt		210,000	0
Proceeds from Issuance of Other Secured Borrowings, at fair value		358,388	211,187
Due from brokers, net		(31,357)	(34,815)
Due to brokers, net		(30)	(1,506)
Net cash provided by (used in) financing activities		830,396	618,835
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		270,868	37,703
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period		92,836	111,822
Cash, Cash Equivalents, and Restricted Cash, End of Period		363,704	149,525
Supplemental disclosure of cash flow information:
Interest paid		14,838	12,660
Income tax paid		(24)	(7)
Dividends payable		11,615	5,740
Shares issued in connection with incentive fee payment (non-cash)		325	0
Share-based Payment Arrangement, Noncash Expense		288	0
Transfers from mortgage loans to real estate owned (non-cash)		948	12,554
Transfers from mortgage loans to investments in non-consolidated entities (non-cash)		129,912	12,600
Purchase of Loans Non Cash		0	800
Principal payments on Other secured borrowings, at fair value (non-cash)		(114,117)	(92,930)
Proceeds received from Other secured borrowings, at fair value (non-cash)		44,381	39,321
Principal payments on Other secured borrowings (non-cash)		(43,720)	0
Proceeds from issuance of Other secured borrowings (non-cash)		0	800
Proceeds from principal payments of investments (non-cash)		121,587	92,930
Repayments of repurchase agreement (non-cash)		$ (43,853)	$ (38,782)

[1] Net of underwriters' discounts and commissions.