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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 1,054,335 | $ 17,777,280 |
Total gains (realized/unrealized) |  |  |
Included in earnings |  | 103,782 |
Paydowns |  | (236,860) |
Sales |  | (16,589,867) |
Recovery of charge-off | 0 | 35 | $ (3,257)
Balance at the end of period |  | 1,054,335 | 17,777,280
VIE, Primary Beneficiary |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period |  | 17,777,280 | 11,022,248
Total gains (realized/unrealized) |  |  |
Included in earnings | (54,154) |  | 443,823
Purchases |  |  | 7,309,459
Paydowns |  |  | (994,993)
Recovery of charge-off |  |  | (3,257)
Balance at the end of period | 839,419 |  | 17,777,280
VIE, Primary Beneficiary | Consolidated K-Series |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 0 | 16,724,451 | 11,022,248
Total gains (realized/unrealized) |  |  |
Included in earnings |  | 35,018 | 443,796
Purchases |  |  | 6,253,739
Paydowns |  | (147,376) | (992,075)
Sales |  | (16,612,093) |
Recovery of charge-off |  | 35 | (3,257)
Balance at the end of period |  | 0 | 16,724,451
VIE, Primary Beneficiary | Consolidated SLST |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 1,054,335 | 1,052,829 | 0
Total gains (realized/unrealized) |  |  |
Included in earnings |  | 68,764 | 27
Purchases |  |  | 1,055,720
Paydowns | (160,762) | (89,484) | (2,918)
Sales |  | 22,226 |
Recovery of charge-off | $ 0 | 0 | 0
Balance at the end of period |  | $ 1,054,335 | $ 1,052,829

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Amount of purchases 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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