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Derivatives - Fair Value of Derivative Contracts (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value
Derivative assets	$ 6,490	$ 50,274
Derivative liabilities	(65,810)	(78,200)
Total net derivative contracts	(59,320)	(27,926)
Current assets
Derivatives, Fair Value
Derivative assets	3,471	18,368
Current assets | Oil Price Swaps
Derivatives, Fair Value
Derivative assets	981	15,887
Current assets | Natural Gas Price Swaps
Derivatives, Fair Value
Derivative assets	2,355	1,598
Current assets | Oil Collars - Three Way
Derivatives, Fair Value
Derivative assets	0	706
Current assets | Natural Gas Collars
Derivatives, Fair Value
Derivative assets	135	177
Noncurrent assets
Derivatives, Fair Value
Derivative assets	3,019	31,906
Noncurrent assets | Oil Price Swaps
Derivatives, Fair Value
Derivative assets	1,412	19,376
Noncurrent assets | Natural Gas Price Swaps
Derivatives, Fair Value
Derivative assets	224	0
Noncurrent assets | Oil Collars - Three Way
Derivatives, Fair Value
Derivative assets	1,228	12,189
Noncurrent assets | Natural Gas Collars
Derivatives, Fair Value
Derivative assets	155	341
Current liabilities
Derivatives, Fair Value
Derivative liabilities	(60,084)	(39,856)
Current liabilities | Oil Price Swaps
Derivatives, Fair Value
Derivative liabilities	(35,033)	(38,396)
Current liabilities | Natural Gas Price Swaps
Derivatives, Fair Value
Derivative liabilities	(4,865)	(1,460)
Current liabilities | Oil Collars - Three Way
Derivatives, Fair Value
Derivative liabilities	(20,186)	0
Noncurrent liabilities
Derivatives, Fair Value
Derivative liabilities	(5,726)	(38,344)
Noncurrent liabilities | Oil Price Swaps
Derivatives, Fair Value
Derivative liabilities	(4,882)	(38,344)
Noncurrent liabilities | Oil Collars - Three Way
Derivatives, Fair Value
Derivative liabilities	$ (844)	$ 0

X

- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



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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- Definition

Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312



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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611



Reference 2: 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 3: 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=28364263&loc=d3e13495-108611



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-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

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