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Derivatives - Fair Value of Derivative Contracts (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Derivatives, Fair Value [Line Items] |  |
Total net derivative contracts | $ 19,992 | $ (134,649)
Current assets | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 88,052 | 6,095
Current assets | Oil basis swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 183 | 0
Current assets | Natural gas price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 6,585
Current assets | Natural gas collars |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 3,111 | 313
Current assets | Diesel price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 397
Noncurrent assets | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 37,983 | 48,718
Noncurrent assets | Oil collars - three way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 190 | 0
Noncurrent assets | Natural gas collars |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 884 | 1,035
Current liabilities | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (31,991) | (116,243)
Current liabilities | Oil basis swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (695) | 0
Current liabilities | Oil collars - two way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (103) | 0
Current liabilities | Diesel price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0 | (41)
Current liabilities | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (2,395) | (8,475)
Noncurrent liabilities | Oil price swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (67,900) | (66,451)
Noncurrent liabilities | Natural gas basis swaps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0 | (4,609)
Noncurrent liabilities | Oil collars - three way |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | (7,327) | 0
Noncurrent liabilities | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | $ 0 | $ (1,973)

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- 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) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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