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Debt - Key Term and Carrying Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Debt outstanding | $ 8,307,640 | $ 6,444,925
Unamortized debt costs | (62,630) | (42,747)
Unamortized debt premiums & discounts | (3,738) | (599)
Unamortized fair value debt adjustment | (32) | 1,691
Debt, net of unamortized debt costs | $ 8,241,240 | 6,403,270
Institutional notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 0.00% |
Debt outstanding | $ 0 | 1,642,314
Asset-backed securitization term notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.98% |
Debt outstanding | $ 3,893,421 | 2,920,807
Corporate notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.82% |
Debt outstanding | $ 2,300,000 | 0
Term loan facilities |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.58% |
Debt outstanding | $ 1,023,600 | 840,000
Asset-backed securitization warehouse |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.94% |
Debt outstanding | $ 320,000 | 264,000
Revolving credit facilities |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.62% |
Debt outstanding | $ 755,000 | 760,500
Capital lease obligations |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 4.93% |
Debt outstanding | $ 15,619 | 17,304
Level 2 |  |
Debt Instrument [Line Items] |  |
Debt outstanding | $ 8,311,100 | $ 6,536,500

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