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Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2012
Stockholders' Equity and Comprehensive Income [Abstract]  
Components of other comprehensive income (loss)
                         
    Three months ended March 31, 2012  
    Gross     Tax effect     Net of tax  

Interest rate swap amounts reclassified into interest expense

  $ 1,142     $ (434   $ 708  

Fuel hedge amount reclassified into cost of operations

    (1,129     429       (700

Changes in fair value of interest rate swaps

    (1,005     382       (623

Change in fair value of fuel hedges

    1,473       (560     913  
   

 

 

   

 

 

   

 

 

 
    $ 481     $ (183   $ 298  
   

 

 

   

 

 

   

 

 

 

 

                         
    Three months ended March 31, 2011  
    Gross     Tax effect     Net of tax  

Interest rate swap amounts reclassified into interest expense

  $ 1,866     $ (709   $ 1,157  

Fuel hedge amounts reclassified into cost of operations

    (811     308       (503

Changes in fair value of interest rate swaps

    66       (25     41  

Changes in fair value of fuel hedges

    4,649       (1,767     2,882  
   

 

 

   

 

 

   

 

 

 
    $ 5,770     $ (2,193   $ 3,577  
   

 

 

   

 

 

   

 

 

 
Amounts included in AOCL
                         
    Fuel Hedge     Interest
Rate Swaps
    Accumulated
Other
Comprehensive
Loss
 

Balance at December 31, 2011

  $ 2,172     $ (5,652   $ (3,480

Amounts reclassified into earnings

    (700     708       8  

Changes in fair value

    913       (623     290  
   

 

 

   

 

 

   

 

 

 

Balance at March 31, 2012

  $ 2,385     $ (5,567   $ (3,182