Quarterly report pursuant to Section 13 or 15(d)

Inventories - Components of Inventories (Details)

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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
New vehicles $ 1,059,010 $ 1,017,523
Used vehicles 266,429 294,496
Service loaners 136,844 130,406
Parts, accessories and other 65,378 70,320
Net inventories $ 1,527,661 $ 1,512,745