Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 181,924	$ 172,309	$ 342,095	$ 332,650
Depreciation and amortization	311,600	253,376	603,885	493,606
Interest Income (Expense)	(104,962)	(68,766)	(195,593)	(128,911)
Other income (expense)	(21,781)	33,855	(26,869)	9,755
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	(13,287)	3,374	(21,746)	16,556
Amount of Gain (Loss) Recognized in Income on Derivative	10,944	(5,310)	16,779	(17,880)
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	(13,287)	3,374	(21,746)	16,556
Amount of Gain (Loss) Recognized in Income on Derivative	10,944	(5,310)	16,779	(17,880)
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	0	0	0	0
Amount of Gain (Loss) Recognized in Income on Derivative	0	0	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 Hedged Item	(13,287)	3,374	(21,746)	16,556
Amount of Gain (Loss) Recognized in Income on Derivative	10,944	(5,310)	16,779	(17,880)
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)	(409)	(2,138)	(800)	(8,976)
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)	13,362	2,043	31,380	(3,089)
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)	(1,188)	(133)	(1,444)	192
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)	(3,545)	(3,156)	(6,879)	(6,468)
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)	$ (1,300)	$ 14,601	$ (2,615)	$ 14,643

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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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge 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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