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Derivatives (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	$ 68,065	$ 15,476
Derivative liabilities	57,920	17,759
Derivatives designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	550	887
Derivative liabilities	1,540	3,082
Derivatives designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	22	448
Derivative liabilities	21	2,853
Derivatives designated as hedging instruments | Commodity contract one | Other current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	257	439
Derivative liabilities	766	229
Derivatives designated as hedging instruments | Commodity contract two | Other current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	271
Derivative liabilities	753
Derivatives not designated as hedging instruments
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	67,515	14,589
Derivative liabilities	56,380	14,677
Derivatives not designated as hedging instruments | Commodity contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	3,231	2,195
Derivative liabilities	16,434	9,519
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	2,065	637
Derivative liabilities	2	81
Derivatives not designated as hedging instruments | Commodity contracts | Other long-term liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	40
Derivative liabilities	1,213	502
Derivatives not designated as hedging instruments | Commodity contract one | Other current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	58,985	11,296
Derivative liabilities	37,709	4,001
Derivatives not designated as hedging instruments | Commodity contract two | Other current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	200
Derivative liabilities	4
Derivatives not designated as hedging instruments | Foreign currency contracts | Other current assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	1,912	369
Derivative liabilities	413	185
Derivatives not designated as hedging instruments | Foreign currency contracts | Accrued expenses and other current liabilities
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets		92
Derivative liabilities	124	389
Derivatives not designated as hedging instruments | Foreign currency contracts | Other long-term assets
Information about derivative instruments measured at fair value and their locations on the consolidated balance sheet
Derivative assets	1,082
Derivative liabilities	$ 481

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Balance Type:	na
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