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Financial Instruments and Risk Management (Tables)
 6 Months Ended
Jun. 30, 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 three and six months ended June 30, 2015 and 2014:

Three Months Ended June 30,

Six Months Ended June 30,

2015

2014

2015

2014

(in thousands)
Into-plane fuel cost
$
127,344


$
154,385


$
235,468


$
302,856

Realized losses (gains) related to fuel derivative contracts, net
4,232


—


6,839


—

Unrealized losses (gains) related to fuel derivative contracts
(3,669
)

467


(1,974
)

467

Aircraft fuel
$
127,907


$
154,852


$
240,333


$
303,323