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) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flow Hedging | Designated as Hedging Instrument | Fuel Collars    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount reclassified from accumulated other comprehensive income (loss) into fuel expense $ 238