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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories The components of inventories consisted of the following (in thousands):
December 31, |  | 2017 |  | 2016
New vehicles |  | $ | 1,553,751 |  |  | $ | 1,338,110 |
Used vehicles |  | 500,011 |  |  | 368,067 |
Parts and accessories |  | 78,982 |  |  | 66,410 |
Total inventories |  | $ | 2,132,744 |  |  | $ | 1,772,587 |
The new vehicle inventory cost is generally reduced by manufacturer holdbacks and incentives, while the related floor plan notes payable are reflective of the gross cost of the vehicle. As of December 31, 2017 and 2016, the carrying value of inventory had been reduced by $19.8 million and $18.1 million, respectively, for assistance received from manufacturers as discussed in Note 1.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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