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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2011
Derivative Instruments  
Outstanding Interest Rate Swap Arrangements
                 
 
                 
    Weighted-   Aggregate
    Average   Notional
    Base Rate   Amount
 
 
                
Interest rate swap arrangements settling through July 2011
    1.35 %   $ 50,000  
Interest rate swap arrangements settling through March 2012
    0.56 %     150,000  
 
 
                
 
Put And Call Option Contracts
         
 
         
    Aggregate  
    Notional  
    Amount  
    (gallons)(a)  
 
 
        
Fuel price derivative instruments — unleaded fuel
Option contracts settling July 2011 — December 2012
    36,558  
 
        
Fuel price derivative instruments — diesel
Option contracts settling July 2011— December 2012
     16,425  
 
 
        
Total fuel price derivative instruments
     52,983  
 
 
        
 
 
 
     
(a)   The settlement of the put and call option contracts is based upon the New York Mercantile Exchange's New York Harbor Reformulated Gasoline Blendstock for Oxygen Blending and the U.S. Department of Energy's weekly retail on-highway diesel fuel price for the month.
Location And Amounts Of Derivative Fair Values In Condensed Consolidated Balance Sheets
                                                                 
 
 
    Derivatives Classified as Assets     Derivatives Classified as Liabilities  
    June 30, 2011     December 31, 2010     June 30, 2011     December 31, 2010  
    Balance             Balance             Balance             Balance        
    Sheet     Fair     Sheet     Fair     Sheet     Fair     Sheet     Fair  
    Location     Value     Location     Value     Location     Value     Location     Value  
     
 
                                                                
Derivatives designated as hedging instruments
                                                                
 
                                                                
Interest rate contracts
   Other assets   $ —     Other assets   $ —     Accrued expenses   $ 361     Accrued expenses   $ 581  
 
                                                                
Derivatives not designated as hedging instruments
                                                                
 
                                                                
Commodity contracts
   Fuel price
derivatives,
at fair value		     —     Fuel price
derivatives,
at fair value		     —     Fuel price
derivatives,
at fair value		     17,820     Fuel price
derivatives,
at fair value		     10,877  
     
 
                                                                
Total derivatives
           $ —             $ —             $ 18,181             $ 11,458  
     
 
     
Location And Amounts Of Derivative Gains And Losses In Condensed Consolidated Statements Of Income
                                                                 
 
                            Amount of Gain                
                            or (Loss)                
                            Reclassified             Amount of Gain or  
                            from             (Loss) Recognized in  
                            Accumulated             Income on Derivative  
    Amount of Gain or             OCI into     Location of Gain or     (Ineffective Portion  
    (Loss) Recognized in             Income     (Loss) Recognized in     and Amount  
    OCI on Derivative         Location of Gain or     (Effective     Income on Derivative     Excluded from  
Derivatives in   (Effective Portion) (a)     (Loss) Reclassified     Portion)     (Ineffective Portion     Effectiveness Testing)  
Cash Flow   Three months ended     from Accumulated     Three months ended     and Amount Excluded     Three months ended  
Hedging   June 30,     OCI into Income     June 30,     from Effectiveness     June 30,  
Relationships   2011     2010     (Effective Portion)     2011     2010     Testing)(b)     2011     2010  
 
 
                                                                
Interest rate contracts
   $ 69     $ 21     Financing interest
expense		   $ (274 )   $ (137)       Financing interest
expense		   $ —     $ —  
                         
            Amount of Gain or  
            (Loss) Recognized in  
            Income on Derivative  
     Derivatives Not   Location of Gain or     Three months ended  
     Designated as   (Loss) Recognized in     June 30,  
      Hedging Instruments   Income on Derivative     2011     2010  
 
 
                        
Commodity contracts
   Net realized and
unrealized gains
on fuel price
derivatives		   $ 6,232     $ 9,363  
 
     
(a)   The amount of gain or (loss) recognized in OCI on the Company's interest rate swap arrangements has been recorded net of tax impacts of $40 in 2011 and $13 in 2010.
 
(b)   No ineffectiveness was reclassified into earnings nor was any amount excluded from effectiveness testing.
                                                                 
 
                            Amount of Gain                
                            or (Loss)                
                            Reclassified             Amount of Gain or  
                            from             (Loss) Recognized in  
                            Accumulated             Income on Derivative  
    Amount of Gain or             OCI into     Location of Gain or     (Ineffective Portion  
    (Loss) Recognized in             Income     (Loss) Recognized in     and Amount  
    OCI on Derivative         Location of Gain or     (Effective     Income on Derivative     Excluded from  
Derivatives in   (Effective Portion) (a)     (Loss) Reclassified     Portion)     (Ineffective Portion     Effectiveness Testing)  
Cash Flow   Six months ended     from Accumulated     Six months ended     and Amount Excluded     Six months ended  
Hedging   June 30,     OCI into Income     June 30,     from Effectiveness     June 30,  
Relationships   2011     2010     (Effective Portion)     2011     2010     Testing)(b)     2011     2010  
 
 
                                                                
Interest rate contracts
   $ 139     $ (96)       Financing interest
expense		   $ (522 )   $ (277)       Financing interest
expense		   $ —     $ —  
                         
            Amount of Gain or  
            (Loss) Recognized in  
            Income on Derivative  
     Derivatives Not   Location of Gain or     Six months ended  
     Designated as   (Loss) Recognized in     June 30,  
      Hedging Instruments   Income on Derivative     2011     2010  
 
 
                        
Commodity contracts
   Net realized and
unrealized (losses) gains
on fuel price
derivatives		   $ (18,943 )   $ 7,583  
 
     
(a)   The amount of gain or (loss) recognized in OCI on the Company's interest rate swap arrangements has been recorded net of tax impacts of $81 in 2011 and $(56) in 2010.
 
(b)   No ineffectiveness was reclassified into earnings nor was any amount excluded from effectiveness testing.