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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - Collateralized Debt Obligations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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		16,163
Paydowns		(168,584)
Sales		(16,589,867)
Balance at the end of period		1,034,992
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	(34,748)	(18,855)
Paydowns	(27,299)	(21,208)
Sales		22,226
Balance at the end of period	$ 992,288	$ 1,034,992

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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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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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-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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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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