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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012 and 2011:
 
Year Ended December 31,
2013
 
2012
 
2011
(in thousands)
Into-plane fuel cost
$
542,523

 
$
471,542

 
$
392,278

Settlement losses (gains)
8,958

 
175

 
(7,436
)
Unrealized mark-to-market losses (gains)
265

 
46

 
3,204

Aircraft fuel
$
551,746

 
$
471,763

 
$
388,046