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Fair Value Measurements - Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Significant Unobservable Inputs [Line Items] |  |
Total net derivative contracts | $ (2,442) | $ 19,992
Fair Value Measurements Level 3 | Oil Basis Swaps |  |
Significant Unobservable Inputs [Line Items] |  |
Derivative, weighted average forward price (in dollars per Bbl) | 13.28 | 14.74
Total net derivative contracts | $ (211) | $ (512)
Fair Value Measurements Level 3 | Oil Basis Swaps | Minimum |  |
Significant Unobservable Inputs [Line Items] |  |
Derivative, forward price (in dollars per Bbl) | 11.31 | 10.00
Fair Value Measurements Level 3 | Oil Basis Swaps | Maximum |  |
Significant Unobservable Inputs [Line Items] |  |
Derivative, forward price (in dollars per Bbl) | 15.49 | 21.98

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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 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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