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Business Combinations (Tables)
 6 Months Ended
Jun. 30, 2011
Business Combinations (Tables) [Abstract]  
Summary of the aggregate consideration paid and the aggregate amounts of the assets acquired and liabilities assumed
                 
    June 30,  
    2011     2010  
Accounts receivable
  $ 953     $ —  
Inventory
    7,923       6,336  
Other current assets
    —       17  
Property and equipment
    1,671       —  
Goodwill
    7,038       3,014  
Other assets
    628       —  
Current liabilities
    (2,491 )     (5 )
 
           
Total consideration
    15,722       9,362  
Seller financed/assumed debt
    (1,711 )     —  
 
           
Cash used in dealership acquisitions
  $ 14,011     $ 9,362