Fair Value Measurements and Derivative Instruments - Designated Cash Flow Hedges (Details) (Cash flow hedge, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ (252,310)	$ 91,108	$ (330,103)	$ 109,154
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(2,684)	29,535	(6,924)	52,639
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(8,037)	(945)	(7,697)	(4,897)
Cross currency swaps | Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	0	(890)	(261)	(2,641)
Interest rate swaps | Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	4,437	(5,816)	(62,309)	87,672
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	17	(7)	(78)	420
Foreign currency forward contracts | Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(238)	19,089	(4,052)	18,612
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	15	15	(12)	5
Foreign currency forward contracts | Depreciation and amortization expenses
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	(163,387)	47,338	(172,629)	38,343
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(450)	(449)	(1,348)	(1,348)
Foreign currency forward contracts | Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	0	(217)	(57)	(222)
Foreign currency collar options | Depreciation and amortization expenses
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	(21,904)	16,801	(30,638)	5,554
Fuel swaps | 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 into Income (Effective Portion)	(8,069)	(953)	(7,607)	(5,322)
Fuel swaps | Swaps | Fuel cost
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	(71,456)	32,785	(64,527)	(22,415)
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	$ (1,996)	$ 12,002	$ (1,206)	$ 38,238