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Fair Value of Financial Instruments - Schedule of Carrying Values and Fair Values of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Carrying Value | Level 1
Assets
Cash and cash equivalents	$ 226,321	$ 245,165
Restricted cash	103,868	67,762
Liabilities
Convertible notes, net	415,999	365,739
Carrying Value | Level 2
Liabilities
Debt obligation facilities and other financing	3,576,657	2,818,292
Carrying Value | Level 3
Assets
Residential investor loans held-for-sale	101,836	0
Liabilities
ABS issued, net	214,938	390,674
Trust preferred securities and subordinated notes, net	138,894	138,860
Guarantee obligations	1,660	2,806
Carrying Value | Senior Notes | Level 1
Liabilities
Senior Notes	225,111	139,989
Estimated Fair Value | Level 1
Assets
Cash and cash equivalents	226,321	245,165
Restricted cash	103,868	67,762
Liabilities
Convertible notes, net	422,266	365,455
Estimated Fair Value | Level 2
Liabilities
Debt obligation facilities and other financing	3,577,448	2,819,393
Estimated Fair Value | Level 3
Assets
Residential investor loans held-for-sale	101,836	0
Liabilities
ABS issued, net	216,104	392,344
Trust preferred securities and subordinated notes, net	83,700	93,465
Guarantee obligations	2,691	3,204
Estimated Fair Value | Senior Notes | Level 1
Liabilities
Senior Notes	$ 227,477	$ 146,716

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