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Collateralized Debt Obligations - Summary of Debt (Details) - Collateralized debt obligations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Face amount		$ 1,547,963	$ 16,284,974
Collateralized debt obligations, at fair value		1,623,658	17,817,709
Consolidated SLST
Debt Instrument [Line Items]
Face amount		975,017	1,040,135
Collateralized debt obligations, at fair value		$ 1,054,335	$ 1,052,829
Weighted average interest rate (as a percent)		2.75%	2.75%
Weighted Average Rate of Notes Issued		3.53%	3.53%
Residential loan securitizations
Debt Instrument [Line Items]
Face amount		$ 557,497	$ 40,621
Collateralized debt obligations, at fair value		$ 554,067	$ 40,429
Weighted average interest rate (as a percent)		3.36%	2.41%
Weighted Average Rate of Notes Issued		4.83%	2.41%
Non-Agency RMBS Re-Securitization
Debt Instrument [Line Items]
Face amount		$ 15,449
Collateralized debt obligations, at fair value		$ 15,256
Non-Agency RMBS Re-Securitization | LIBOR
Debt Instrument [Line Items]
Interest rate, basis spread		0.0525%
Weighted Average Rate of Notes Issued, basis spread		5.25%
Non-Agency RMBS Re-Securitization | LIBOR | Subsequent Event | Forecast
Debt Instrument [Line Items]
Interest rate, basis spread	7.75%
Consolidated K-Series
Debt Instrument [Line Items]
Face amount			$ 15,204,218
Collateralized debt obligations, at fair value			$ 16,724,451
Weighted average interest rate (as a percent)			4.12%
Weighted Average Rate of Notes Issued			3.85%

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-Publisher FASB
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-SubTopic 30
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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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