Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Derivatives designated as hedging instruments	Dec. 31, 2011 Derivatives designated as hedging instruments	Mar. 31, 2012 Derivatives designated as hedging instruments Commodity contracts Other current assets	Dec. 31, 2011 Derivatives designated as hedging instruments Commodity contracts Other current assets	Dec. 31, 2011 Derivatives designated as hedging instruments Commodity contracts Accrued expenses and other current liabilities	Mar. 31, 2012 Derivatives not designated as hedging instruments	Dec. 31, 2011 Derivatives not designated as hedging instruments	Mar. 31, 2012 Derivatives not designated as hedging instruments Commodity contracts Other current assets	Dec. 31, 2011 Derivatives not designated as hedging instruments Commodity contracts Other current assets	Mar. 31, 2012 Derivatives not designated as hedging instruments Commodity contracts Accrued expenses and other current liabilities	Dec. 31, 2011 Derivatives not designated as hedging instruments Commodity contracts Accrued expenses and other current liabilities	Mar. 31, 2012 Derivatives not designated as hedging instruments Commodity contracts Other long-term assets	Dec. 31, 2011 Derivatives not designated as hedging instruments Commodity contracts Other long-term assets	Mar. 31, 2012 Derivatives not designated as hedging instruments Commodity contracts Other long-term liabilities	Dec. 31, 2011 Derivatives not designated as hedging instruments Commodity contracts Other long-term liabilities	Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts Other current assets	Dec. 31, 2011 Derivatives not designated as hedging instruments Foreign currency contracts Other current assets	Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts Accrued expenses and other current liabilities	Mar. 31, 2011 Derivatives not designated as hedging instruments Foreign currency contracts Accrued expenses and other current liabilities	Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts Other long-term assets	Dec. 31, 2011 Derivatives not designated as hedging instruments Foreign currency contracts Other long-term assets	Mar. 31, 2012 Derivatives not designated as hedging instruments Foreign currency contracts Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 167,966	$ 68,065	$ 4,213	$ 550	$ 4,213	$ 528	$ 22	$ 163,753	$ 67,515	$ 153,230	$ 59,185	$ 6,985	$ 3,231	$ 2,225	$ 2,065	$ 43	$ 40	$ 254	$ 1,912	$ 883		$ 98	$ 1,082	$ 35
Derivative liabilities	$ 148,144	$ 57,920	$ 1,026	$ 1,540	$ 1,026	$ 1,519	$ 21	$ 147,118	$ 56,380	$ 95,140	$ 37,713	$ 48,564	$ 16,434	$ 241	$ 2	$ 779	$ 1,213	$ 66	$ 413	$ 2,080	$ 124	$ 102	$ 481	$ 146

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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