FAIR VALUE MEASUREMENTS - Schedule of Changes in the Company’s Level 3 Inputs Financial Assets (Details) - Recurring Basis $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 14,331,652
Transfers
Transfers from Level 3	(149,919)
Transfers to Level 3	1,389
Computershare Mortgage Acquisition (Note 3)	696,462
Gain (loss) included in net income
Credit losses on securities	(914)
Included in servicing revenue	7,251
Excess MSRs	19,430
Excess MSRs, equity method investees	1,617
Servicer advance investments	6,388
Consumer loans	(51,389)
Residential mortgage loans	24,641
Gain (loss) on settlement of investments, net	(620)
Other income (loss), net	12,013
Gains (losses) included in OCI	(3,474)
Interest income	56,834
Purchases, sales and repayments
Purchases, net	850,948
Proceeds from sales	(49,030)
Proceeds from repayments	(1,959,057)
Originations and other	1,728,159
Ending balance	15,522,381
Excess MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	271,150
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	(1,032)
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	19,430
Excess MSRs, equity method investees	1,617
Servicer advance investments
Consumer loans
Residential mortgage loans
Gain (loss) on settlement of investments, net	(656)
Other income (loss), net
Gains (losses) included in OCI
Interest income	10,522
Purchases, sales and repayments
Purchases, net	122,887
Proceeds from sales	0
Proceeds from repayments	(28,312)
Originations and other
Ending balance	395,606
MSRs, MSR Financing Receivables, Excess Spread Financing
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8,405,938
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	697,494
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	7,251
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	0
Gains (losses) included in OCI	0
Interest income	0
Purchases, sales and repayments
Purchases, net	0
Proceeds from sales	2,404
Proceeds from repayments	0
Originations and other	580,244
Ending balance	9,693,331
Servicer Advance Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	376,881
Transfers
Transfers from Level 3	(7,873)
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	6,388
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	0
Gains (losses) included in OCI	0
Interest income	13,254
Purchases, sales and repayments
Purchases, net	400,652
Proceeds from sales	0
Proceeds from repayments	(432,082)
Originations and other	0
Ending balance	357,220
Real Estate and Other Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	804,029
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	(914)
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	36
Other income (loss), net	5,585
Gains (losses) included in OCI	(3,474)
Interest income	14,869
Purchases, sales and repayments
Purchases, net	80,517
Proceeds from sales	0
Proceeds from repayments	(91,109)
Originations and other	0
Ending balance	809,539
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	23,804
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	(23,472)
Gains (losses) included in OCI	0
Interest income	0
Purchases, sales and repayments
Purchases, net	0
Proceeds from sales	0
Proceeds from repayments	0
Originations and other	(61)
Ending balance	271
Residential Mortgage Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	513,381
Transfers
Transfers from Level 3	(142,046)
Transfers to Level 3	1,389
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	24,641
Gain (loss) on settlement of investments, net	0
Other income (loss), net	4,348
Gains (losses) included in OCI	0
Interest income	0
Purchases, sales and repayments
Purchases, net	246,892
Proceeds from sales	(61,532)
Proceeds from repayments	(32,086)
Originations and other	(170,400)
Ending balance	384,587
Consumer Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1,274,005
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	(51,389)
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	0
Gains (losses) included in OCI	0
Interest income	15,978
Purchases, sales and repayments
Purchases, net	0
Proceeds from sales	10,098
Proceeds from repayments	(302,325)
Originations and other	0
Ending balance	946,367
Notes and Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	429,550
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	0
Gains (losses) included in OCI	0
Interest income	2,211
Purchases, sales and repayments
Purchases, net	0
Proceeds from sales	0
Proceeds from repayments	(37,670)
Originations and other	0
Ending balance	394,091
Mortgage Loans Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,232,914
Transfers
Transfers from Level 3	0
Transfers to Level 3	0
Computershare Mortgage Acquisition (Note 3)	0
Gain (loss) included in net income
Credit losses on securities	0
Included in servicing revenue	0
Excess MSRs	0
Excess MSRs, equity method investees	0
Servicer advance investments	0
Consumer loans	0
Residential mortgage loans	0
Gain (loss) on settlement of investments, net	0
Other income (loss), net	25,552
Gains (losses) included in OCI	0
Interest income	0
Purchases, sales and repayments
Purchases, net	0
Proceeds from sales	0
Proceeds from repayments	(1,035,473)
Originations and other	1,318,376
Ending balance	$ 2,541,369