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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Summary of inventories |  |
New Vehicles Inventory, Gross | $ 1,279,416 | $ 1,156,383
Used Vehicles Inventory, Gross | 313,612 | 294,812
Rental Vehicles Inventory, Gross | 141,215 | 131,080
Parts, Accessories and Other Inventory, Gross | 78,676 | 77,762
Inventory, Gross | 1,812,919 | 1,660,037
Lower of cost or market reserves | 9,010 | 8,222
Inventories, net | $ 1,803,909 | $ 1,651,815

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