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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 losses (realized/unrealized) |  |  |
Included in earnings | 103,782 | 443,823 |
Purchases |  | 7,309,459 |
Paydowns | (236,860) | (994,993) |
Sales | (16,589,867) |  |
Charge-off |  | (3,257) |
Balance at the end of period | 1,054,335 | 17,777,280 | $ 11,022,248
VIE, Primary Beneficiary |  |  |
Total losses (realized/unrealized) |  |  |
Included in earnings | 68,764 |  |
Sales | 22,226 |  |
Balance at the end of period | 1,054,335 |  |
VIE, Primary Beneficiary | Consolidated SLST |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 1,052,829 | 0 |
Total losses (realized/unrealized) |  |  |
Included in earnings |  | 27 |
Purchases |  | 1,055,720 |
Paydowns | (89,484) | (2,918) |
Charge-off |  | 0 |
Balance at the end of period |  | 1,052,829 | 0
VIE, Primary Beneficiary | Consolidated K-Series |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 16,724,451 | 11,022,248 | 9,189,459
Total losses (realized/unrealized) |  |  |
Included in earnings | 35,018 | 443,796 | (211,738)
Purchases |  | 6,253,739 | 2,182,330
Paydowns | (147,376) | (992,075) | (137,803)
Sales | (16,612,093) |  |
Charge-off |  | (3,257) |
Balance at the end of period | $ 0 | $ 16,724,451 | $ 11,022,248

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Charge-offs + References No definition available. + Details
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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=117815213&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=117815213&loc=d3e19207-110258 + Details
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