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Supplemental Information on Oil and Natural Gas Producing Activities - Capitalized Costs Related to Oil, Natural Gas and NGL Producing Activities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Oil and natural gas properties
Proved	$ 10,972,816us-gaap_CapitalizedCostsProvedProperties	[1]	$ 12,262,921us-gaap_CapitalizedCostsProvedProperties	[1]	$ 8,969,296us-gaap_CapitalizedCostsProvedProperties
Unproved	531,606us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative		865,863us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative		689,393us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
Total oil and natural gas properties	11,504,422us-gaap_OilAndGasPropertyFullCostMethodGross		13,128,784us-gaap_OilAndGasPropertyFullCostMethodGross		9,658,689us-gaap_OilAndGasPropertyFullCostMethodGross
Less: accumulated depreciation, depletion and impairment	(5,762,969)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities		(5,231,182)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities		(4,791,534)us-gaap_CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities
Net oil and natural gas properties capitalized costs	$ 5,741,453us-gaap_OilAndGasPropertyFullCostMethodNet		$ 7,897,602us-gaap_OilAndGasPropertyFullCostMethodNet		$ 4,867,155us-gaap_OilAndGasPropertyFullCostMethodNet
[1] Includes cumulative capitalized interest of approximately $23.4 million and $11.7 million at December 31, 2013 and 2012, respectively.

X

- Definition

Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447

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X

- Definition

The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(c)(7)(ii))

-URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862

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X

- Definition

Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 360

-Glossary Proved Properties

-URI http://asc.fasb.org/extlink&oid=6522428



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Properties

-URI http://asc.fasb.org/extlink&oid=21914647

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- Definition

Oil and gas properties, gross, carried under the full cost method.

+ References

No definition available.

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- Definition

Oil and gas properties, net of depletion, carried under the full cost method.

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No definition available.

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