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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - Collateralized Debt Obligations - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		$ 17,777,280
Total gains (realized/unrealized)
Included in earnings		101,221
Paydowns		(210,654)
Sales		(16,589,867)
Balance at the end of period		1,077,980
Consolidated K-Series | VIE, Primary Beneficiary
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		16,724,451
Total gains (realized/unrealized)
Included in earnings		35,018
Paydowns		(147,376)
Sales		(16,612,093)
Balance at the end of period		0
Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,054,335	1,052,829
Total gains (realized/unrealized)
Included in earnings	(35,525)	66,203
Paydowns	(113,834)	(63,278)
Sales		22,226
Balance at the end of period	$ 904,976	$ 1,077,980

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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- Definition

Amount of sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Section 50
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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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