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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Summary of inventories |  |
New Vehicles Inventory, Gross | $ 1,304,103 | $ 1,262,797
Used Vehicles Inventory, Gross | 309,969 | 275,508
Rental Vehicles Inventory, Gross | 145,780 | 134,509
Parts, Accessories and Other Inventory, Gross | 74,133 | 72,917
Inventory, Gross | 1,833,985 | 1,745,731
Lower of cost or market reserves | 7,454 | 7,980
Inventories, net | $ 1,826,531 | $ 1,737,751

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