Fair Value Measurements and Derivative Instruments (Details 9) (Cash flow hedge, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	$ 91,108	$ 119,127	$ 109,154	$ 28,740
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	29,535	37,805	52,639	88,200
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(945)	3,109	(4,897)	(1,093)
Cross currency swaps | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)		13,221		851
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)		14,405		2,505
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)		234
Cross currency swaps | Interest expense, net of interest capitalized
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(890)	(498)	(2,641)	(1,319)
Interest rate swaps | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	(5,816)	(19,146)	87,672	(50,070)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(7)	(277)	420	(347)
Foreign currency forward contracts | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	19,089	(238)	18,612	(715)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	15	(173)	5	(182)
Foreign currency forward contracts | Depreciation and amortization expenses
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	47,338	19,881	38,343	(10,169)
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(449)	(196)	(1,348)	(588)
Foreign currency forward contracts | Interest expense, net of interest capitalized
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(217)		(222)
Foreign currency collar options | Depreciation and amortization expenses
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	16,801	4,229	5,554	(8,335)
Fuel contracts | Swaps | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(953)	3,325	(5,322)	(564)
Fuel contracts | Swaps | Fuel cost
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	32,785	100,942	(22,415)	96,463
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	$ 12,002	$ 24,332	$ 38,238	$ 88,317