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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2012
Investments, All Other Investments [Abstract]  
Components of aircraft fuel expense
The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2012, 2011 and 2010:
 
Year Ended December 31,
2012
 
2011
 
2010
(in thousands)
Into-plane fuel cost
$
471,542

 
$
392,278

 
$
251,754

Settlement losses (gains)
175

 
(7,436
)
 
(1,483
)
Unrealized mark-to-market losses (gains)
46

 
3,204

 
(2,065
)
Aircraft fuel
$
471,763

 
$
388,046

 
$
248,206