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Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Inventory Disclosure [Abstract] |  |
New vehicles | $ 648,448 | $ 983,123
Used vehicles | 413,209 | 319,791
Service loaners | 128,531 | 152,278
Parts, accessories and other | 57,066 | 62,683
Net inventories | $ 1,247,254 | $ 1,517,875

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date for elements of machinery or equipment held for the purpose of replacing similar parts in the course of repair or maintenance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details
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