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Derivatives - Open Commodity Derivative Contracts (Details)	12 Months Ended
	Dec. 31, 2013 MMcf
Natural gas price swaps | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	35,490
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	4.20
Oil price swaps | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	8,813
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	92.98
Oil price swaps | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	7,979
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	86.13
Oil collars - three way | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	8,213
Oil collars - three way | January 2014 - December 2014 | Sold Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, minimum	70.00
Oil collars - three way | January 2014 - December 2014 | Purchased Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, minimum	90.20
Oil collars - three way | January 2014 - December 2014 | Sold Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, maximum	100.00
Oil collars - three way | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	2,920
Oil collars - three way | January 2015 - December 2015 | Sold Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, minimum	73.13
Oil collars - three way | January 2015 - December 2015 | Purchased Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, minimum	90.82
Oil collars - three way | January 2015 - December 2015 | Sold Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Collar range, maximum	103.13
Natural gas collars | January 2014 - December 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	937
Collar range, minimum	4.00
Collar range, maximum	7.78
Natural gas collars | January 2015 - December 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional (Oil in MBbl/Natural Gas in MMcf)	1,010
Collar range, minimum	4.00
Collar range, maximum	8.55

X

- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant