Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Consolidated financial statements of fuel swaps dedesignated and immediately recognized into earnings (Details 3)

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Fair Value Measurements and Derivatives - Consolidated financial statements of fuel swaps dedesignated and immediately recognized into earnings (Details 3) - Reclassification out of Accumulated Other Comprehensive Income - Fuel Swaps - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss recognized in other income (expense), net $ (92) $ (92)
Amount reclassified from accumulated other comprehensive income (loss) into other income (expense), net $ 1,465 $ 2,994