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Financing Agreements - Financing Agreements (Details) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 04, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | $ 7,293,716 | $ 6,377,370
Fair value / Carrying Value |  |  |  | 7,132,366 | 6,378,782
Stock split ratio, common stock | 0.25 | 0.25 | 0.25 |  |
6.25% Convertible Senior Notes | Convertible Debt |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Stock split ratio, common stock | 0.25 |  |  |  |
Fair Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 4,353,324 | 3,254,300
Amortized Cost Balance |  |  |  | 4,349,122 | 3,267,981
Fair value / Carrying Value |  |  |  | 4,199,458 | 3,266,773
Carrying Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 2,940,392 | 3,123,070
Fair value / Carrying Value |  |  |  | 2,932,908 | 3,112,009
Securitized debt | Fair Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 2,477,584 | 1,304,912
Amortized Cost Balance |  |  |  | 2,473,382 | 1,318,593
Fair value / Carrying Value |  |  |  | 2,323,718 | 1,316,131
Securitized debt | Carrying Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 1,054,817 | 1,340,583
Fair value / Carrying Value |  |  |  | 1,050,998 | 1,334,342
Agreements with mark-to-market collateral provisions | Fair Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 1,433,857 | 627,026
Amortized Cost Balance |  |  |  | 1,433,857 | 627,026
Fair value / Carrying Value |  |  |  | 1,433,857 | 628,280
Agreements with mark-to-market collateral provisions | Carrying Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 1,191,708 | 1,240,510
Fair value / Carrying Value |  |  |  | 1,191,566 | 1,239,937
Agreements with Non-mark-to-market Collateral Provisions | Fair Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 441,883 | 1,322,362
Amortized Cost Balance |  |  |  | 441,883 | 1,322,362
Fair value / Carrying Value |  |  |  | 441,883 | 1,322,362
Agreements with Non-mark-to-market Collateral Provisions | Carrying Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 463,878 | 311,977
Fair value / Carrying Value |  |  |  | 463,204 | 311,260
Convertible senior notes | Carrying Value |  |  |  |  |
Financing Agreements [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  | 229,989 | 230,000
Fair value / Carrying Value |  |  |  | $ 227,140 | $ 226,470

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