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Financial Instruments and Risk Management (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015:
 
Year Ended December 31,
2017
 
2016
 
2015
(in thousands)
Into-plane fuel cost
$
615,581

 
$
447,553

 
$
454,747

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

 
—

 
10,580

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

 
—

 
(3,880
)
Aircraft fuel
$
615,581

 
$
447,553

 
$
461,447