RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Cash Flow Statement (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash Flows From Operating Activities
Net income (loss)	$ 287,487	$ 89,949
Change in fair value of investments, net
Change in fair value of investments, net	341,219	247,075
Change in fair value of equity investments	(6,012)	2,098
Change in fair value of secured notes and bonds payable	4,605	2,500
(Gain) loss on settlement of investments, net	(274,709)	(167,609)
(Gain) loss on sale of originated residential mortgage loans, held-for-sale, net	(142,457)	(109,268)
(Gain) loss on transfer of loans to real estate owned ("REO")	(2,166)	(3,276)
Accretion and other amortization	(21,224)	(12,766)
Provision (reversal) for credit losses on securities, loans and REO	462	(2,803)
Non-cash portions of servicing revenue, net	(76,376)	149,730
Deferred tax provision	90,628	(16,822)
Mortgage loans originated and purchased for sale, net of fees	(11,439,065)	(7,531,856)
Sales proceeds and loan repayment proceeds for residential mortgage loans, held-for-sale	9,856,746	8,137,021
Residential mortgage loan repayment proceeds of consolidated CFEs	80,822	57,854
Interest received from servicer advance investments, loans and other	13,488	13,705
Purchase of investments of consolidated CFEs	(9,811)	0
Proceeds from sale and repayments of investments of consolidated CFEs	2,090	0
Changes in:
Servicer advances receivable, net	165,425	230,596
Other assets	37,637	50,472
Accrued expenses and other liabilities	(223,335)	21,346
Net cash provided by (used in) operating activities	(1,314,546)	1,248,442
Cash Flows From Investing Activities
Purchase of US Treasuries	(4,733,368)	0
Purchase of servicer advance investments	(212,656)	(232,446)
Purchase of RMBS	(1,891)	(2,883,278)
US Treasury short sales	1,425,370	0
Reverse repurchase agreements entered	(1,256,872)	0
Purchase of Single-family rental (“SFR”) properties, MSRs and other assets	(63,877)	(4,607)
Draws on revolving consumer loans	(4,113)	(6,831)
Origination of mortgage loans receivable	(649,698)	0
Net settlement of derivatives	371,827	225,560
Return of investments in Excess MSRs	10,423	7,821
Principal repayments from servicer advance investments	224,039	240,331
Principal repayments from RMBS	165,324	143,419
Principal repayments from residential mortgage loans	12,187	8,272
Principal repayments from consumer loans	153,479	24,784
Proceeds from sale of MSRs and MSR financing receivables	(671)	1,357
Proceeds from sale of REO	5,216	5,678
Net cash provided by (used in) investing activities	(4,050,190)	(602,156)
Cash Flows From Financing Activities
Repayments of secured financing agreements	(18,055,590)	(11,327,261)
Repayments of warehouse credit facilities	(10,778,294)	(8,473,149)
Repayment of unsecured senior notes	(275,000)	0
Net settlement of margin deposits under repurchase agreements and derivatives	(346,569)	(387,780)
Repayments of secured notes and bonds payable	(1,405,197)	(1,677,534)
Deferred financing fees	(8,298)	(2,103)
Dividends paid on common and preferred stock	(143,298)	(140,968)
Borrowings under secured financing agreements	22,495,882	12,240,027
Borrowings under warehouse credit facilities	12,047,306	8,062,420
Borrowings under notes receivable financing	0
Borrowings under secured notes and bonds payable	761,266	1,303,796
Proceeds from issuance of unsecured senior notes	767,103	0
Noncontrolling interest in equity of consolidated subsidiaries - distributions	(3,728)	(5,430)
Proceeds from issuance of debt obligations of consolidated CFEs	257,597	0
Repayments of debt obligations of consolidated CFEs	(87,545)	(51,983)
Net cash provided by (used in) financing activities	5,225,635	(459,965)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(139,101)	186,321
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	1,697,095	1,629,328	$ 1,629,328
Cash, Cash Equivalents and Restricted Cash, End of Period	1,557,994	1,815,649	1,697,095
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	465,964	313,870
Cash paid during the period for income taxes	1,259	402
Supplemental Schedule of Non-Cash Investing and Financing Activities
Dividends declared but not paid on common and preferred stock	143,199	143,149
Transfer from residential mortgage loans to REO and other assets	5,917	6,025
Real estate securities retained from loan securitizations	0	0
Residential mortgage loans subject to repurchase	1,845,889	1,189,907	1,782,998
Purchase of Agency RMBS, settled after quarter-end	1,271,542	0
As Reported (Unaudited)
Cash Flows From Operating Activities
Net income (loss)	287,487
Change in fair value of investments, net
Change in fair value of investments, net	341,744
Change in fair value of equity investments	(6,012)
Change in fair value of secured notes and bonds payable	4,605
(Gain) loss on settlement of investments, net	(274,709)
(Gain) loss on sale of originated residential mortgage loans, held-for-sale, net	(149,545)
(Gain) loss on transfer of loans to real estate owned ("REO")	(2,166)
Accretion and other amortization	(21,091)
Provision (reversal) for credit losses on securities, loans and REO	462
Non-cash portions of servicing revenue, net	(76,376)
Deferred tax provision	90,628
Mortgage loans originated and purchased for sale, net of fees	(11,439,065)
Sales proceeds and loan repayment proceeds for residential mortgage loans, held-for-sale	10,114,343
Residential mortgage loan repayment proceeds of consolidated CFEs	0
Interest received from servicer advance investments, loans and other	13,488
Purchase of investments of consolidated CFEs	0
Proceeds from sale and repayments of investments of consolidated CFEs	0
Changes in:
Servicer advances receivable, net	165,425
Other assets	29,916
Accrued expenses and other liabilities	(223,335)
Net cash provided by (used in) operating activities	(1,144,201)
Cash Flows From Investing Activities
Purchase of US Treasuries	(4,733,368)
Purchase of servicer advance investments	(212,656)
Purchase of RMBS	(16,928)
US Treasury short sales	1,425,370
Reverse repurchase agreements entered	(1,256,872)
Purchase of Single-family rental (“SFR”) properties, MSRs and other assets	(63,877)
Draws on revolving consumer loans	(4,113)
Origination of mortgage loans receivable	(649,698)
Net settlement of derivatives	371,827
Return of investments in Excess MSRs	10,423
Principal repayments from servicer advance investments	224,039
Principal repayments from RMBS	177,333
Principal repayments from residential mortgage loans	12,187
Principal repayments from consumer loans	153,479
Proceeds from sale of MSRs and MSR financing receivables	(671)
Proceeds from sale of REO	5,216
Net cash provided by (used in) investing activities	(4,053,218)
Cash Flows From Financing Activities
Repayments of secured financing agreements	(18,055,590)
Repayments of warehouse credit facilities	(10,778,294)
Repayment of unsecured senior notes	(275,000)
Net settlement of margin deposits under repurchase agreements and derivatives	(346,569)
Repayments of secured notes and bonds payable	(1,405,197)
Deferred financing fees	(8,298)
Dividends paid on common and preferred stock	(143,298)
Borrowings under secured financing agreements	22,495,882
Borrowings under warehouse credit facilities	12,047,306
Borrowings under notes receivable financing	0
Borrowings under secured notes and bonds payable	761,266
Proceeds from issuance of unsecured senior notes	767,103
Noncontrolling interest in equity of consolidated subsidiaries - distributions	(3,728)
Proceeds from issuance of debt obligations of consolidated CFEs	0
Repayments of debt obligations of consolidated CFEs	0
Net cash provided by (used in) financing activities	5,055,583
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(141,836)
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	1,672,819
Cash, Cash Equivalents and Restricted Cash, End of Period	1,530,983		1,672,819
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	419,701
Cash paid during the period for income taxes	1,259
Supplemental Schedule of Non-Cash Investing and Financing Activities
Dividends declared but not paid on common and preferred stock	143,199
Transfer from residential mortgage loans to REO and other assets	5,917
Real estate securities retained from loan securitizations	34,203
Residential mortgage loans subject to repurchase	1,845,889
Purchase of Agency RMBS, settled after quarter-end	1,271,542
Error Adjustments
Cash Flows From Operating Activities
Net income (loss)	0
Change in fair value of investments, net
Change in fair value of investments, net	(525)
Change in fair value of equity investments	0
Change in fair value of secured notes and bonds payable	0
(Gain) loss on settlement of investments, net	0
(Gain) loss on sale of originated residential mortgage loans, held-for-sale, net	7,088
(Gain) loss on transfer of loans to real estate owned ("REO")	0
Accretion and other amortization	(133)
Provision (reversal) for credit losses on securities, loans and REO	0
Non-cash portions of servicing revenue, net	0
Deferred tax provision	0
Mortgage loans originated and purchased for sale, net of fees	0
Sales proceeds and loan repayment proceeds for residential mortgage loans, held-for-sale	(257,597)
Residential mortgage loan repayment proceeds of consolidated CFEs	80,822
Interest received from servicer advance investments, loans and other	0
Purchase of investments of consolidated CFEs	0
Proceeds from sale and repayments of investments of consolidated CFEs	0
Changes in:
Servicer advances receivable, net	0
Other assets	0
Accrued expenses and other liabilities	0
Net cash provided by (used in) operating activities	(170,345)
Cash Flows From Investing Activities
Purchase of US Treasuries	0
Purchase of servicer advance investments	0
Purchase of RMBS	15,037
US Treasury short sales	0
Reverse repurchase agreements entered	0
Purchase of Single-family rental (“SFR”) properties, MSRs and other assets	0
Draws on revolving consumer loans	0
Origination of mortgage loans receivable	0
Net settlement of derivatives	0
Return of investments in Excess MSRs	0
Principal repayments from servicer advance investments	0
Principal repayments from RMBS	(12,009)
Principal repayments from residential mortgage loans	0
Principal repayments from consumer loans	0
Proceeds from sale of MSRs and MSR financing receivables	0
Proceeds from sale of REO	0
Net cash provided by (used in) investing activities	3,028
Cash Flows From Financing Activities
Repayments of secured financing agreements	0
Repayments of warehouse credit facilities	0
Repayment of unsecured senior notes	0
Net settlement of margin deposits under repurchase agreements and derivatives	0
Repayments of secured notes and bonds payable	0
Deferred financing fees	0
Dividends paid on common and preferred stock	0
Borrowings under secured financing agreements	0
Borrowings under warehouse credit facilities	0
Borrowings under notes receivable financing	0
Borrowings under secured notes and bonds payable	0
Proceeds from issuance of unsecured senior notes	0
Noncontrolling interest in equity of consolidated subsidiaries - distributions	0
Proceeds from issuance of debt obligations of consolidated CFEs	257,597
Repayments of debt obligations of consolidated CFEs	(87,545)
Net cash provided by (used in) financing activities	170,052
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	2,735
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	24,276
Cash, Cash Equivalents and Restricted Cash, End of Period	27,011		24,276
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	46,263
Cash paid during the period for income taxes	0
Supplemental Schedule of Non-Cash Investing and Financing Activities
Dividends declared but not paid on common and preferred stock	0
Transfer from residential mortgage loans to REO and other assets	0
Real estate securities retained from loan securitizations	(34,203)
Residential mortgage loans subject to repurchase	0
Purchase of Agency RMBS, settled after quarter-end	0
Subtotal
Cash Flows From Operating Activities
Net income (loss)	287,487
Change in fair value of investments, net
Change in fair value of investments, net	341,219
Change in fair value of equity investments	(6,012)
Change in fair value of secured notes and bonds payable	4,605
(Gain) loss on settlement of investments, net	(274,709)
(Gain) loss on sale of originated residential mortgage loans, held-for-sale, net	(142,457)
(Gain) loss on transfer of loans to real estate owned ("REO")	(2,166)
Accretion and other amortization	(21,224)
Provision (reversal) for credit losses on securities, loans and REO	462
Non-cash portions of servicing revenue, net	(76,376)
Deferred tax provision	90,628
Mortgage loans originated and purchased for sale, net of fees	(11,439,065)
Sales proceeds and loan repayment proceeds for residential mortgage loans, held-for-sale	9,856,746
Residential mortgage loan repayment proceeds of consolidated CFEs	80,822
Interest received from servicer advance investments, loans and other	13,488
Purchase of investments of consolidated CFEs	0
Proceeds from sale and repayments of investments of consolidated CFEs	0
Changes in:
Servicer advances receivable, net	165,425
Other assets	29,916
Accrued expenses and other liabilities	(223,335)
Net cash provided by (used in) operating activities	(1,314,546)
Cash Flows From Investing Activities
Purchase of US Treasuries	(4,733,368)
Purchase of servicer advance investments	(212,656)
Purchase of RMBS	(1,891)
US Treasury short sales	1,425,370
Reverse repurchase agreements entered	(1,256,872)
Purchase of Single-family rental (“SFR”) properties, MSRs and other assets	(63,877)
Draws on revolving consumer loans	(4,113)
Origination of mortgage loans receivable	(649,698)
Net settlement of derivatives	371,827
Return of investments in Excess MSRs	10,423
Principal repayments from servicer advance investments	224,039
Principal repayments from RMBS	165,324
Principal repayments from residential mortgage loans	12,187
Principal repayments from consumer loans	153,479
Proceeds from sale of MSRs and MSR financing receivables	(671)
Proceeds from sale of REO	5,216
Net cash provided by (used in) investing activities	(4,050,190)
Cash Flows From Financing Activities
Repayments of secured financing agreements	(18,055,590)
Repayments of warehouse credit facilities	(10,778,294)
Repayment of unsecured senior notes	(275,000)
Net settlement of margin deposits under repurchase agreements and derivatives	(346,569)
Repayments of secured notes and bonds payable	(1,405,197)
Deferred financing fees	(8,298)
Dividends paid on common and preferred stock	(143,298)
Borrowings under secured financing agreements	22,495,882
Borrowings under warehouse credit facilities	12,047,306
Borrowings under notes receivable financing	0
Borrowings under secured notes and bonds payable	761,266
Proceeds from issuance of unsecured senior notes	767,103
Noncontrolling interest in equity of consolidated subsidiaries - distributions	(3,728)
Proceeds from issuance of debt obligations of consolidated CFEs	257,597
Repayments of debt obligations of consolidated CFEs	(87,545)
Net cash provided by (used in) financing activities	5,225,635
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(139,101)
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	1,697,095
Cash, Cash Equivalents and Restricted Cash, End of Period	1,557,994		1,697,095
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	465,964
Cash paid during the period for income taxes	1,259
Supplemental Schedule of Non-Cash Investing and Financing Activities
Dividends declared but not paid on common and preferred stock	143,199
Transfer from residential mortgage loans to REO and other assets	5,917
Real estate securities retained from loan securitizations	0
Residential mortgage loans subject to repurchase	1,845,889
Purchase of Agency RMBS, settled after quarter-end	1,271,542
Reclassifications
Cash Flows From Operating Activities
Net income (loss)	0
Change in fair value of investments, net
Change in fair value of investments, net	0
Change in fair value of equity investments	0
Change in fair value of secured notes and bonds payable	0
(Gain) loss on settlement of investments, net	0
(Gain) loss on sale of originated residential mortgage loans, held-for-sale, net	0
(Gain) loss on transfer of loans to real estate owned ("REO")	0
Accretion and other amortization	0
Provision (reversal) for credit losses on securities, loans and REO	0
Non-cash portions of servicing revenue, net	0
Deferred tax provision	0
Mortgage loans originated and purchased for sale, net of fees	0
Sales proceeds and loan repayment proceeds for residential mortgage loans, held-for-sale	0
Residential mortgage loan repayment proceeds of consolidated CFEs	0
Interest received from servicer advance investments, loans and other	0
Purchase of investments of consolidated CFEs	(9,811)
Proceeds from sale and repayments of investments of consolidated CFEs	2,090
Changes in:
Servicer advances receivable, net	0
Other assets	7,721
Accrued expenses and other liabilities	0
Net cash provided by (used in) operating activities	0
Cash Flows From Investing Activities
Purchase of US Treasuries	0
Purchase of servicer advance investments	0
Purchase of RMBS
US Treasury short sales	0
Reverse repurchase agreements entered	0
Purchase of Single-family rental (“SFR”) properties, MSRs and other assets	0
Draws on revolving consumer loans	0
Origination of mortgage loans receivable	0
Net settlement of derivatives	0
Return of investments in Excess MSRs	0
Principal repayments from servicer advance investments	0
Principal repayments from RMBS	0
Principal repayments from residential mortgage loans	0
Principal repayments from consumer loans	0
Proceeds from sale of MSRs and MSR financing receivables	0
Proceeds from sale of REO	0
Net cash provided by (used in) investing activities	0
Cash Flows From Financing Activities
Repayments of secured financing agreements	0
Repayments of warehouse credit facilities	0
Repayment of unsecured senior notes	0
Net settlement of margin deposits under repurchase agreements and derivatives	0
Repayments of secured notes and bonds payable	0
Deferred financing fees	0
Dividends paid on common and preferred stock	0
Borrowings under secured financing agreements	0
Borrowings under warehouse credit facilities	0
Borrowings under notes receivable financing	0
Borrowings under secured notes and bonds payable	0
Proceeds from issuance of unsecured senior notes	0
Noncontrolling interest in equity of consolidated subsidiaries - distributions	0
Proceeds from issuance of debt obligations of consolidated CFEs	0
Repayments of debt obligations of consolidated CFEs	0
Net cash provided by (used in) financing activities	0
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	0
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	0
Cash, Cash Equivalents and Restricted Cash, End of Period	0		$ 0
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	0
Cash paid during the period for income taxes	0
Supplemental Schedule of Non-Cash Investing and Financing Activities
Dividends declared but not paid on common and preferred stock	0
Transfer from residential mortgage loans to REO and other assets	0
Real estate securities retained from loan securitizations	0
Residential mortgage loans subject to repurchase	0
Purchase of Agency RMBS, settled after quarter-end	0
Consolidated Entity, Excluding Consolidated VIE
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	423,269	0
Consolidated Entity, Excluding Consolidated VIE | As Reported (Unaudited)
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	505,091
Consolidated Entity, Excluding Consolidated VIE | Error Adjustments
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	0
Consolidated Entity, Excluding Consolidated VIE | Subtotal
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	505,091
Consolidated Entity, Excluding Consolidated VIE | Reclassifications
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	(81,822)
Variable Interest Entity, Primary Beneficiary
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	81,822	$ 0
Variable Interest Entity, Primary Beneficiary | As Reported (Unaudited)
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	0
Variable Interest Entity, Primary Beneficiary | Error Adjustments
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	0
Variable Interest Entity, Primary Beneficiary | Subtotal
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	0
Variable Interest Entity, Primary Beneficiary | Reclassifications
Cash Flows From Investing Activities
Principal repayments from mortgage loans receivable	$ 81,822