Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 172,309	$ 170,748	$ 332,650	$ 348,162
Depreciation and amortization	253,376	234,937	493,606	470,686
Interest Income (Expense)	(68,766)	(70,821)	(128,911)	(144,886)
Other income (expense)	33,855	(2,709)	9,755	(5,320)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(37,562)	21,236	(29,750)	34,988
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	213	(20)	183	(80)
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	(881)	0	1,326	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	(36,894)	21,256	(31,259)	35,068
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	3,374	(4,311)	16,556	(1,854)
Amount of Gain (Loss) Recognized in Income on Derivative	(5,310)	6,220	(17,880)	5,862
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	3,374		16,556
Amount of Gain (Loss) Recognized in Income on Derivative	(5,310)	869	(17,880)	2,042
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		(4,311)		(1,854)
Amount of Gain (Loss) Recognized in Income on Derivative		5,351		3,820
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	3,374	0	16,556	0
Amount of Gain (Loss) Recognized in Income on Derivative	(5,310)	869	(17,880)	2,042
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	(4,311)	0	(1,854)
Amount of Gain (Loss) Recognized in Income on Derivative	0	5,351	0	3,820
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)	(2,138)	(7,863)	(8,976)	(16,720)
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)	(133)	2,498	192	4,775
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)	2,043	(41,835)	(3,089)	(81,763)
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)	(3,156)	(3,312)	(6,468)	(6,624)
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)	$ 14,601	$ (4,105)	$ 14,643	$ (7,675)

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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