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Financial Derivative Instruments and Risk Management - Effect of Fuel Derivative Instruments Designated as Cash Flow Hedges (Details) (Cash Flow Hedging, Energy Related Derivative, Jet Fuel, USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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Cash Flow Hedging | Energy Related Derivative | Jet Fuel
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of gain (loss) recognized in AOCI on derivatives (Effective portion) | $ (3,018) | $ (2,745) |
| Gain (loss) reclassified from AOCI into income (Fuel expense) (Effective portion) | (15,235) | (17) |
| Amount of gain (loss) recognized into income (Ineffective portion) | $ 20 | $ (111) |