Fair Value Measurements and Derivatives (Details 3) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivatives Fair Value [Line Items]
Fuel	$ 99,643	$ 91,231	$ 288,286	$ 266,780
Depreciation and amortization	143,700	134,532	415,648	376,878
Interest expense, net	69,540	66,339	202,226	183,495
Cash Flow Hedging
Derivatives Fair Value [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income	10,706	(11,644)	19,214	(31,593)
Fuel	99,643	91,231	288,286	266,780
Depreciation and amortization	143,700	134,532	415,648	376,878
Interest expense, net	69,540	66,339	202,226	183,495
Cash Flow Hedging \| Fuel contracts \| Fuel
Derivatives Fair Value [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income	11,595	(9,796)	23,024	(26,383)
Cash Flow Hedging \| Foreign currency forward contracts \| Depreciation and amortization expense
Derivatives Fair Value [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income	(703)	(1,157)	(2,761)	(2,909)
Cash Flow Hedging \| Interest rate contracts \| Interest expense, net
Derivatives Fair Value [Line Items]
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income	$ (186)	$ (691)	$ (1,049)	$ (2,301)

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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