Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Fuel Collars Designated as Cash flow Hedges (Details 4)

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Fair Value Measurements and Derivatives - Effects of Fuel Collars Designated as Cash flow Hedges (Details 4) - Cash Flow Hedging - Designated as Hedging Instrument - Fuel Collars - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Loss recognized in other comprehensive income (loss) - effective portion $ (127) $ (436)
Gain recognized in other income (expense) - ineffective portion 4 111
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 370 $ 248 $ 1,111