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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
The components of inventories consisted of the following (in thousands):
December 31,
 
2017
 
2016
New vehicles
 
$
1,553,751

 
$
1,338,110

Used vehicles
 
500,011

 
368,067

Parts and accessories
 
78,982

 
66,410

   Total inventories
 
$
2,132,744

 
$
1,772,587