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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 637,700 | $ 449,300
Used vehicles | 523,400 | 534,000
Service loaners | 173,900 | 143,800
Parts, accessories and other | 98,900 | 89,700
Net inventories | $ 1,433,900 | $ 1,216,800

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