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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 243,366 | $ 648,448
Used vehicles | 593,964 | 413,209
Service loaners | 119,996 | 128,531
Parts, accessories and other | 59,240 | 57,066
Net inventories | $ 1,016,566 | $ 1,247,254

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