Financing Agreements - Financing Agreements (Details) $ in Thousands		3 Months Ended
	Apr. 04, 2022	Mar. 31, 2022 USD ($)	Mar. 31, 2021	Dec. 31, 2021 USD ($)
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 7,093,448		$ 6,377,370
Fair value / Carrying Value		$ 7,028,211		6,378,782
Stock split ratio, common stock		0.25	0.25
Subsequent Event
Financing Agreements [Line Items]
Stock split ratio, common stock	0.25
6.25% Convertible Senior Notes | Convertible Debt | Subsequent Event
Financing Agreements [Line Items]
Stock split ratio, common stock	0.25
Fair Value
Financing Agreements [Line Items]
Unpaid Principal Balance		$ 3,860,415		3,254,300
Amortized Cost Balance		3,870,222		3,267,981
Fair value / Carrying Value		3,804,906		3,266,773
Carrying Value
Financing Agreements [Line Items]
Unpaid Principal Balance		3,233,033		3,123,070
Fair value / Carrying Value		3,223,305		3,112,009
Agreements with mark-to-market collateral provisions | Fair Value
Financing Agreements [Line Items]
Unpaid Principal Balance		1,555,250		627,026
Amortized Cost Balance		1,555,250		627,026
Fair value / Carrying Value		1,555,250		628,280
Agreements with mark-to-market collateral provisions | Carrying Value
Financing Agreements [Line Items]
Unpaid Principal Balance		1,386,009		1,240,510
Fair value / Carrying Value		1,385,685		1,239,937
Financing agreements with non-mark-to-market collateral provisions | Fair Value
Financing Agreements [Line Items]
Unpaid Principal Balance		563,860		1,322,362
Amortized Cost Balance		563,860		1,322,362
Fair value / Carrying Value		563,860		1,322,362
Financing agreements with non-mark-to-market collateral provisions | Carrying Value
Financing Agreements [Line Items]
Unpaid Principal Balance		438,374		311,977
Fair value / Carrying Value		437,548		311,260
Securitized debt | Fair Value
Financing Agreements [Line Items]
Unpaid Principal Balance		1,741,305		1,304,912
Amortized Cost Balance		1,751,112		1,318,593
Fair value / Carrying Value		1,685,796		1,316,131
Securitized debt | Carrying Value
Financing Agreements [Line Items]
Unpaid Principal Balance		1,178,650		1,340,583
Fair value / Carrying Value		1,173,265		1,334,342
Convertible senior notes | Carrying Value
Financing Agreements [Line Items]
Unpaid Principal Balance		230,000		230,000
Fair value / Carrying Value		$ 226,807		$ 226,470