Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities		$ 44,168	$ 66,461
Cash Flows from Investing Activities:
Purchase of securities		(1,329,629)	(1,007,906)
Purchase of loans		(733,275)	(360,225)
Capital improvements of real estate owned		(1,893)	(126)
Proceeds from disposition of securities		772,618	1,778,774
Proceeds from disposition of loans		1,064	9,025
Contributions to investments in unconsolidated entities		(7,497)	(4,713)
Distributions from investments in unconsolidated entities		70,211	13,996
Proceeds from disposition of real estate owned		630	7,743
Proceeds from principal payments of securities		225,901	210,581
Proceeds from principal payments of loans		136,328	222,148
Proceeds from investments sold short		242,239	242,519
Repurchase of securities sold short		(133,798)	(289,098)
Payments on financial derivatives		(31,732)	(89,938)
Proceeds from financial derivatives		34,018	60,550
Payments made on reverse repurchase agreements		(7,242,821)	(6,132,124)
Proceeds from reverse repurchase agreements		7,118,141	6,174,336
Due from brokers, net		670	8,243
Due to brokers, net		(298)	4,392
Net cash provided by (used in) investing activities		(879,123)	848,177
Cash flows provided by (used in) financing activities:
Net proceeds from issuance of common stock	[1]	0	95,537
Offering costs paid		0	(253)
Repurchase of common stock		0	(3,035)
Dividends paid		(34,553)	(36,721)
Contributions from non-controlling interests		6,528	8,160
Distributions to non-controlling interests		(15,336)	(5,421)
Proceeds from issuance of other secured borrowings		47,343	36,883
Principal payments on other secured borrowings		(12,831)	(37,398)
Borrowings under repurchase agreements		3,081,092	2,826,214
Repayments of repurchase agreements		(2,621,656)	(3,949,677)
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		(13,735)	14,938
Due to brokers, net		(1,797)	5,007
Net cash provided by (used in) financing activities		858,003	(840,409)
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash		23,048	74,229
Cash, Cash Equivalents, and Restricted Cash, Beginning of Period		111,822	72,477
Cash, Cash Equivalents, and Restricted Cash, End of Period		134,870	146,706
Supplemental disclosure of cash flow information:
Interest paid		22,741	40,957
Income tax paid		770	171
Dividends payable		7,963	5,293
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)		12,554	1,522
Transfers from mortgage loans to investments in non-consolidated entities (non-cash)		74,836	10,839
Purchase of Loans Non Cash		800	6,270
Principal payments on Other secured borrowings, at fair value (non-cash)		(212,254)	(86,257)
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)		212,254	86,257
Repayments of repurchase agreement (non-cash)		$ (39,618)	$ (27,288)

[1] Net of underwriters' discounts and commissions.