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

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

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- Definition

Derivative, Additional Cash Paid on Settlement of Hedge

+ References

No definition available.

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- Definition

Forecast of Commodity Requirements, Maximum Length of Time Used

+ References

No definition available.

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

+ References

No definition available.

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Derivatives (Narrative - Commodity Future Contracts) (Details) (Cash Flow Hedging [Member], Natural gas contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013 MMBTU	Mar. 31, 2012	Dec. 31, 2012 MMBTU
Derivative [Line Items]
Natural gas contracts, notional amounts (in millions of BTUs)	1,720,000		2,400,000
Derivative, additional cash paid on settlement of hedge	$ 0.2	$ 1.5
Cash flow hedge loss to be reclassified within 12 months			$ 0.8
Minimum [Member]
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	40.00%
Maximum [Member]
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	70.00%
Forecast of commodity requirements, maximum length of time used	18 months