Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details 2)

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Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details 2) - Cash Flow Hedging - Designated as Hedging Instrument - Fuel Swaps - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Loss recognized in other comprehensive income (loss) - effective portion $ (9,506) $ (2,801)
Loss recognized in other income (expense) - ineffective portion (5,227) (6,051)
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 31,137 $ 20,536