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Financial Instruments and Risk Management - Narrative (Details)
Jun. 30, 2014
gal
Jun. 30, 2014
Fuel [Member]
Options Held [Member]
Dec. 31, 2013
Fuel [Member]
Future [Member]
hedge_contract
Derivative [Line Items]      
Anticipated jet fuel consumption protected by hedges (in gallons) 52,500,000    
Anticipated jet fuel consumption protected by hedges (as a percent) 50.10%    
Derivative contract, weighted average ceiling price (in USD per gallon)   3.25  
Number of derivative contracts     0