XML 23 R70.htm IDEA: XBRL DOCUMENT v2.4.0.6

Hedging Activities (Schedule Of Derivative Instruments) (Details)	Dec. 31, 2012	Jul. 31, 2012	Feb. 29, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2010
Derivative [Line Items]
Daily Volume (Bbls/day)	4,000	3,000	2,000	2,000	2,300	3,000
Fixed Price Swap, Period of January 2013 through December 2013 [Member]
Derivative [Line Items]
Daily Volume (Bbls/day)	5,000
Weighted Average Price (usd per bbl)	100.90

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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