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Hedging Activities (Schedule Of Derivative Instruments) (Details)	Sep. 30, 2013
Fixed Price Swap, Period of October through December 2013 [Member]
Derivative [Line Items]
Daily Volume	5,000
Weighted Average Price	99.86
Fixed Price Swap, Period of January through March 2014 [Member]
Derivative [Line Items]
Daily Volume	4,000
Weighted Average Price	104.75
Fixed Price Swap, Period of April through December 2014 [Member]
Derivative [Line Items]
Daily Volume	2,000
Weighted Average Price	101.50
Fixed Price Swap, Period of October through December 2013 [Member]
Derivative [Line Items]
Daily Volume	10,000
Weighted Average Price	4.00
Fixed Price Swap, Period of January through December 2014 [Member]
Derivative [Line Items]
Daily Volume	20,000
Weighted Average Price	3.98
Fixed Price Swap, Period of January through March 2016 [Member]
Derivative [Line Items]
Daily Volume	15,000
Weighted Average Price	3.97
Fixed Price Swap, April 2016 [Member]
Derivative [Line Items]
Daily Volume	5,000
Weighted Average Price	3.90

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

Name:	invest_DerivativeNonmonetaryNotionalAmount
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