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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016, 2015 and 2014:
 
Year Ended December 31,
2016
 
2015
 
2014
(in thousands)
Into-plane fuel cost
$
447,553

 
$
454,747

 
$
608,033

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

 
10,580

 
995

Unrealized losses (gains) related to fuel derivative contracts, net
—

 
(3,880
)
 
3,881

Aircraft fuel
$
447,553

 
$
461,447

 
$
612,909