Financial Instruments and Risk Management (Tables)

3 Months Ended

Mar. 31, 2014

Investments, All Other Investments [Abstract]

Components of aircraft fuel expense

The following table summarizes the components of aircraft fuel expense for the three months ended March 31, 2014 and 2013:

	Three Months Ended March 31,
	2014		2013
	(in thousands)
Into-plane fuel cost	$	148,471	$	128,713
Settlement losses (gains)	—		(428		)
Unrealized mark-to-market losses (gains)	—		3,381
Aircraft fuel	$	148,471	$	131,666