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Hedging Activities (Schedule Of Derivative Instruments) (Details)	Sep. 30, 2014
Fixed Price Swap, April through December 2014 [Member]
Derivative [Line Items]
Daily Volume	2,000
Weighted Average Price	101.50
Fixed Price Swap, June through December 2014 [Member]
Derivative [Line Items]
Daily Volume	155,000
Weighted Average Price	4.07
Fixed Price Swap, January through December 2015 [Member]
Derivative [Line Items]
Daily Volume	175,000
Weighted Average Price	4.08
Fuel Price Swap, April 2015 [Member]
Derivative [Line Items]
Daily Volume	185,000
Weighted Average Price	4.07
Fuel Price Swap, May through December 2015 [Member]
Derivative [Line Items]
Daily Volume	195,000
Weighted Average Price	4.07
Fixed Price Swap, January through March 2016 [Member]
Derivative [Line Items]
Daily Volume	135,000
Weighted Average Price	4.03
Fixed Price Swap, April 2016 [Member]
Derivative [Line Items]
Daily Volume	125,000
Weighted Average Price	4.03
Fuel Price Swap, May through December 2016 [Member]
Derivative [Line Items]
Daily Volume	30,000
Weighted Average Price	4.01

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