Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of fuel swaps dedesignated and recognized into earnings (Details 3)

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Fair Value Measurements and Derivatives - Effects of fuel swaps dedesignated and recognized into earnings (Details 3) - Dedesignated as Hedging Instrument - Fuel Swaps - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivatives Fair Value [Line Items]      
Amount reclassified from accumulated other comprehensive income (loss) into other income (expense), net $ 2,994 $ 10,000
Loss recognized in other income (expense), net $ (271) $ (4,727)