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) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income | Fuel Swaps    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Amount reclassified from accumulated other comprehensive income (loss) into other income (expense), net $ 1,529