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Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives not designated as cash-flow hedging instruments [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	$ 1,347	$ 223
Total liability	(1,425)	(3,730)
Total derivative instruments	(78)	(3,507)
Derivatives not designated as cash-flow hedging instruments [Member] | Other assets [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	118
Derivatives not designated as cash-flow hedging instruments [Member] | Derivatives contracts [Member] | Natural gas commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	1,040
Derivatives not designated as cash-flow hedging instruments [Member] | Derivatives contracts [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Derivatives Asset	189	223
Derivatives not designated as cash-flow hedging instruments [Member] | Derivative liability short term [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Total liability	(994)	(2,269)
Derivatives not designated as cash-flow hedging instruments [Member] | Derivative liability long term [Member] | Crude oil commodity contracts [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Total liability	(377)	(1,461)
Derivatives designated as cash-flow hedging instruments [Member] | Derivative liability long term [Member] | Interest Rate Swap [Member]
Effect of derivative instruments on the condensed consolidated balance sheets
Total liability	$ (54)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-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 Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

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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.



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

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-Name Accounting Standards Codification

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

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



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