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Financial Instruments and Risk Management (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2013 and 2012:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
(in thousands)
Into-plane fuel cost
$
143,978

 
$
123,517

 
$
402,066

 
$
351,057

Settlement losses (gains)
6,663

 
(580
)
 
6,348

 
(543
)
Unrealized mark-to-market losses (gains)
(5,655
)
 
(921
)
 
3,489

 
460

Aircraft fuel
$
144,986

 
$
122,016

 
$
411,903

 
$
350,974