Fair Value Measurements and Derivative Instruments (Details 9) (Cash flow hedge, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (7,330)	$ 179,942
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	15,270	32,472
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness testing)	(671)	537
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 OCI on Derivative (Effective Portion)		(3,587)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(2,921)
Cross currency swaps | Interest Expense, net of interest capitalized
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(871)
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 OCI on Derivative (Effective Portion)	12,688	4,554
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness testing)	54	1
Foreign currency forward contracts | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(238)	(238)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness testing)	(5)	7
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 OCI on Derivative (Effective Portion)	(15,082)	17,708
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(449)	(196)
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 OCI on Derivative (Effective Portion)	(14,961)
Fuel contracts | Swaps | Other income (expense)
Effect of derivative instruments involved in cash flow hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness testing)	(720)	529
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 OCI on Derivative (Effective Portion)	10,025	161,267
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 16,828	$ 35,827