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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Summary of inventories |  |
New Vehicles Inventory, Gross | $ 1,095,792 | $ 1,156,383
Used Vehicles Inventory, Gross | 344,271 | 294,812
Rental Vehicles Inventory, Gross | 138,501 | 131,080
Parts, Accessories and Other Inventory, Gross | 81,912 | 77,762
Inventory, Gross | 1,660,476 | 1,660,037
Lower of cost or market reserves | 8,687 | 8,222
Inventories, net | $ 1,651,789 | $ 1,651,815

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