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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014 and 2013:
 
Year Ended December 31,
2015
 
2014
 
2013
(in thousands)
Into-plane fuel cost
$
454,747

 
$
608,033

 
$
542,523

Realized losses (gains) related to fuel derivative contracts, net
10,580

 
995

 
8,958

Unrealized losses (gains) related to fuel derivative contracts, net
(3,880
)
 
3,881

 
265

Aircraft fuel
$
461,447

 
$
612,909

 
$
551,746