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Collateralized Debt Obligations - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Collateralized debt obligations	$ 1,870,517	$ 2,102,717
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	3.00%
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Debt Instrument, Redemption, Period Three | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	1.00%
Debt Instrument, Redemption, Period Three | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate increase, non-redemption	2.00%
Collateralized debt obligations | Secured debt
Debt Instrument [Line Items]
Outstanding Face Amount	$ 1,944,948	2,197,606
Collateralized debt obligations	1,870,517	2,102,717
Collateralized debt obligations | Secured debt | Consolidated SLST
Debt Instrument [Line Items]
Outstanding Face Amount	652,933	699,408
Collateralized debt obligations	$ 593,737	$ 634,495
Weighted average interest rate (as a percent)	2.75%	2.75%
Collateralized debt obligations | Secured debt | Consolidated SLST | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Collateralized debt obligations	$ 399,300	$ 647,100
Collateralized debt obligations | Secured debt | Consolidated SLST | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Collateralized debt obligations	548,600	647,100
Collateralized debt obligations | Secured debt | Consolidated SLST | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Collateralized debt obligations	523,200	603,800
Collateralized debt obligations | Secured debt | Residential loan securitizations
Debt Instrument [Line Items]
Outstanding Face Amount	1,292,015	1,498,198
Collateralized debt obligations	$ 1,276,780	$ 1,468,222
Weighted average interest rate (as a percent)	4.00%	3.54%

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