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Inventories (Components of Inventories, net) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Inventories, net | $ 1,966,456 | $ 1,772,587
New vehicles |  |
Inventory [Line Items] |  |
Inventories, net | 1,412,668 | 1,338,110
Used vehicles |  |
Inventory [Line Items] |  |
Inventories, net | 474,948 | 368,067
Parts and accessories |  |
Inventory [Line Items] |  |
Inventories, net | $ 78,840 | $ 66,410

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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