Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 182,415	$ 160,752	$ 515,065	$ 508,914
Depreciation and amortization	259,923	240,150	753,529	710,836
Interest Income (Expense)	(80,679)	(68,540)	(209,590)	(213,426)
Other income (expense)	(3,832)	(1,226)	5,923	(6,546)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(11,647)	21,776	(41,397)	56,836
Fuel swaps \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(28)	(175)	155	(255)
Fuel swaps \| Fuel cost
Effect of derivative instruments involved in hedging on the consolidated financial statements
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	478	0	1,804	0
Foreign currency forward contracts \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(12,097)	21,951	(43,356)	57,019
Fair Value Hedging
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,124	1,013	18,680	(841)
Amount of Gain (Loss) Recognized in Income on Derivative	(3,512)	55	(21,392)	5,917
Fair Value Hedging \| Interest Contracts \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,124		18,680
Amount of Gain (Loss) Recognized in Income on Derivative	(3,512)	600	(21,392)	2,642
Fair Value Hedging \| Interest Contracts \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item		1,013		(841)
Amount of Gain (Loss) Recognized in Income on Derivative		(545)		3,275
Fair Value Hedging \| Interest rate swaps \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,124	0	18,680	0
Amount of Gain (Loss) Recognized in Income on Derivative	(3,512)	600	(21,392)	2,642
Fair Value Hedging \| Interest rate swaps \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	1,013	0	(841)
Amount of Gain (Loss) Recognized in Income on Derivative	0	(545)	0	3,275
Cash flow hedge \| Interest Contracts \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Effective Portion)	(1,395)	(7,860)	(10,371)	(24,580)
Cash flow hedge \| Fuel swaps \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Effective Portion)	466	1,758	658	6,533
Cash flow hedge \| Fuel swaps \| Fuel cost
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Effective Portion)	4,548	(32,386)	1,459	(114,149)
Cash flow hedge \| Foreign exchange contracts \| Depreciation and amortization expenses
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Effective Portion)	(3,157)	(3,312)	(9,625)	(9,936)
Cash flow hedge \| Foreign currency forward contracts \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Effective Portion)	$ (835)	$ (1,512)	$ 13,808	$ (9,187)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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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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