Fair Value of Financial Instruments - Schedule of Carrying Values and Fair Values of Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Carrying Value | Level 1
Assets
Cash and cash equivalents	$ 301,979	$ 245,165
Restricted cash	146,247	67,762
Liabilities
Convertible notes, net	367,021	365,739
Carrying Value | Level 2
Liabilities
Debt obligation facilities and other financing	3,011,683	2,818,292
Carrying Value | Level 3
Assets
Residential investor loans held-for-sale	25,233	0
Liabilities
ABS issued, net	270,814	390,674
Trust preferred securities and subordinated notes, net	138,883	138,860
Guarantee obligations	2,053	2,806
Carrying Value | Senior Notes | Level 1
Liabilities
Senior Notes	227,281	139,989
Estimated Fair Value | Level 1
Assets
Cash and cash equivalents	301,979	245,165
Restricted cash	146,247	67,762
Liabilities
Convertible notes, net	368,220	365,455
Estimated Fair Value | Level 2
Liabilities
Debt obligation facilities and other financing	3,012,578	2,819,393
Estimated Fair Value | Level 3
Assets
Residential investor loans held-for-sale	25,233	0
Liabilities
ABS issued, net	271,687	392,344
Trust preferred securities and subordinated notes, net	86,490	93,465
Guarantee obligations	2,770	3,204
Estimated Fair Value | Senior Notes | Level 1
Liabilities
Senior Notes	$ 229,270	$ 146,716