Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Interest income:
Interest income	$ 189,871	$ 156,426
Interest expense:
Interest expense	208,082	165,769
Net interest expense	(18,211)	(9,343)
Nonrelated Party
Interest income:
Cash and short-term investments	10,007	14,582
Principal-only stripped mortgage-backed securities	11,595	270
Loans held for sale	87,394	65,421
Placement fees relating to custodial funds	79,795	76,133
Other	1,080	20
Interest expense:
Assets sold under agreements to repurchase	94,229	70,435
Mortgage loan participation purchase and sale agreements	3,804	4,077
Notes payable secured by mortgage servicing assets	36,578	44,006
Unsecured senior notes	60,137	38,832
Interest shortfall on repayments of mortgage loans serviced for Agency securitizations	9,774	6,121
Interest on mortgage loan impound deposits	2,581	1,987
Other	979	311
Interest expense	208,082	165,769
Loan Repo Facility
Interest expense:
Assets sold under agreements to repurchase	$ 94,229	$ 70,435