Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 160,171	$ 160,341
Depreciation and amortization	292,285	240,230
Interest Income (Expense)	(90,631)	(60,145)
Other income (expense)	(5,088)	(24,100)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	4,780	7,810
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	(136)	(30)
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	(98)	2,205
Fair Value Hedging
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative	5,835	(12,570)
Amount of Gain (Loss) Recognized in Income on Hedged Item	(8,459)	13,182
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 Derivative	(2,257)	(12,570)
Amount of Gain (Loss) Recognized in Income on Hedged Item	(8,459)	13,182
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 Derivative	0	0
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	0
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 Derivative	(2,257)	(12,570)
Amount of Gain (Loss) Recognized in Income on Hedged Item	(8,459)	13,182
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 Derivative	8,092	0
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	0
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)	(391)	(6,838)
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)	18,018	(5,131)
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)	(256)	325
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)	(3,334)	(3,312)
Cash flow hedge \| Foreign exchange 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)	$ (1,315)	$ 42

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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