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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
week
Dec. 31, 2010
Dec. 31, 2009
Surety Bonds      
Outstanding bonds $ 31,400,000 $ 27,800,000  
Future minimum lease payments under non-cancelable operating leases      
2012 21,045,000    
2013 18,707,000    
2014 17,800,000    
2015 16,411,000    
2016 13,160,000    
Thereafter 35,318,000    
Total future minimum lease payment 122,441,000    
Rental expenses for properties and equipment 21,800,000 10,000,000 9,100,000
Sales and Purchase Commitments      
Sales commitments under derivative programs 390,700,000    
Purchase commitments under derivative programs 65,300,000    
Sales and purchase commitments period (in weeks) 2    
Vendor and Customer Rebate and Branding Allowances      
Estimated amount of fuel rebates and branding allowances that would have to be repaid upon de-branding 24,500,000    
Fuel rebates and branding allowances estimated to be received from branded dealers $ 24,100,000