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Financial Instruments (Details 2) (Derivatives not designated as hedging instruments [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	$ 1,591
Derivatives Liability		(3,507)
Total derivative instruments	1,591	(3,507)
Other assets [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	1,236
Other current assets [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	355
Derivative liability short term [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Liability		(2,046)
Derivative liability long term [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Liability		$ (1,461)

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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 44C

-Subparagraph a

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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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.

+ References

Reference 1: 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.



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-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.



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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958



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