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Financial Instruments and Risk Management (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2015 and 2014:

Three Months Ended March 31,

2015

2014

(in thousands)
Into-plane fuel cost
$
108,124


$
148,471

Realized losses (gains) related to fuel derivative contracts
2,607


—

Unrealized losses (gains) related to fuel derivative contracts
1,695


—

Aircraft fuel
$
112,426


$
148,471