Securitized Debt - Maturities of Long-Term Debt (Details) - Variable Interest Entities, Primary Beneficiary - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securitized debt
Debt Instrument [Line Items]
Within One Year	$ 1,336,379	$ 1,405,503
One to Three Years	2,193,495	2,302,421
Three to Five Years	1,673,400	1,738,678
Greater Than Five Years	2,912,852	2,942,234
Total	8,116,126	8,388,836
Securitized Loans | Non-Agency RMBS
Debt Instrument [Line Items]
Within One Year	198	251
One to Three Years	244	326
Three to Five Years	0	0
Greater Than Five Years	60	67
Total	$ 502	$ 644