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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Components of aircraft fuel expense
The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2014, 2013 and 2012:
 
Year Ended December 31,
2014
 
2013
 
2012
(in thousands)
Into-plane fuel cost
$
608,033

 
$
542,523

 
$
471,542

Realized losses (gains)
995

 
8,958

 
175

Unrealized mark-to-market losses (gains)
3,881

 
265

 
46

Aircraft fuel
$
612,909

 
$
551,746

 
$
471,763