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Derivatives - Fair Value of Derivative Contracts (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
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)

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)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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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 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

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X

- 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



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-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

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