Fair Value Measurements and Derivative Instruments - Designated Cash Flow Hedges (Details) (Cash flow hedge, USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
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)	$ (57,352,000)	$ (7,330,000)
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(4,437,000)	15,270,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(1,671,000)	(671,000)
Cross currency 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)	0	0
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)	(261,000)	(871,000)
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)	(34,525,000)	12,688,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(19,000)	54,000
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)	(3,576,000)	(238,000)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	0	0
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)	1,195,000	(15,082,000)
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(449,000)	(449,000)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	(20,000)	(5,000)
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)	(57,000)
Foreign currency collar options | 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)	0	0
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)	(2,607,000)	(14,961,000)
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)	(1,632,000)	(720,000)
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)	(21,415,000)	10,025,000
Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	$ (94,000)	$ 16,828,000