Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Inventory [Line Items]
New Vehicles Inventory, Gross	$ 1,156,383	$ 1,262,797
Used Vehicles Inventory, Gross	294,812	275,508
Rental Vehicles Inventory, Gross	131,080	134,509
Parts, Accessories and Other Inventory, Gross	77,762	72,917
Inventory, Gross	1,660,037	1,745,731
Summary of inventories
Lower of cost or market reserves	$ (8,222)	$ (7,980)