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Financial Instruments and Risk Management (Tables)
 9 Months Ended
Sep. 30, 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 three and nine months ended September 30, 2016 and 2015:

Three Months Ended September 30,

Nine Months Ended September 30,

2016

2015

2016

2015

(in thousands)
Into-plane fuel cost
$
121,844


$
114,081


$
321,018


$
349,549

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


1,736


—


8,575

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


82


—


(1,892
)
Aircraft fuel
$
121,844


$
115,899


$
321,018


$
356,232