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Financial Instruments and Risk Management (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014 and 2013:

Three Months Ended June 30,

Six Months Ended June 30,

2014

2013

2014

2013

(in thousands)
Into-plane fuel cost
$
154,385


$
129,375


$
302,856


$
258,088

Settlement losses (gains)
—


113


—


(315
)
Unrealized mark-to-market losses (gains)
—


5,763


—


9,144

Premium expense recognized related to fuel option contracts
467


—


467


—

Aircraft fuel
$
154,852


$
135,251


$
303,323


$
266,917