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Financial Instruments and Risk Management (Tables)
 6 Months Ended
Jun. 30, 2013
Investments, All Other Investments [Abstract]  
Components of aircraft fuel expense
The following table summarizes the components of aircraft fuel expense for the three and six months ended June 30, 2013 and 2012:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
Into-plane fuel cost
$
129,375

 
$
116,622

 
$
258,088

 
$
227,539

Settlement losses (gains)
113

 
2,488

 
(315
)
 
37

Unrealized mark-to-market losses (gains)
5,763

 
1,123

 
9,144

 
1,382

Aircraft fuel
$
135,251

 
$
120,233

 
$
266,917

 
$
228,958