Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Fuel Options Which Were Not Designated as Hedging Instruments (Details 5)

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Fair Value Measurements and Derivatives - Effects of Fuel Options Which Were Not Designated as Hedging Instruments (Details 5) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Not Designated as Hedging Instrument | Fuel Options        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain recognized in other income (expense)   $ 101   $ 101