Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 194,268	$ 160,171
Depreciation and amortization	324,330	292,285
Interest Income (Expense)	(87,377)	(90,631)
Other Nonoperating Income (Expense)	(32,859)	(5,088)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(22,380)	12,722
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	(3,391)	(391)
Fuel swaps \| Fuel
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	(14,233)	18,018
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	344	(256)
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	(3,337)	(3,334)
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	(1,763)	(1,315)
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) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(3,391)	(391)
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	(21,330)	(8,459)
Amount of Gain (Loss) Recognized in Income on Derivative	20,430	5,835
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	(21,330)	(8,459)
Amount of Gain (Loss) Recognized in Income on Derivative	20,430	(2,257)
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
Amount of Gain (Loss) Recognized in Income on Derivative	0	8,092
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	(21,330)	(8,459)
Amount of Gain (Loss) Recognized in Income on Derivative	20,430	(2,257)
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	0
Amount of Gain (Loss) Recognized in Income on Derivative	$ 0	$ 8,092

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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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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