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

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- Definition

Forecast of Commodity Requirements, Maximum Length of Time Used

+ References

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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=35736893&loc=d3e80748-113994

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- Definition

The amount of cash received during the period on settlement of a hedge.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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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.

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Derivatives (Narrative - Commodity Future Contracts) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 MMBTU	Mar. 31, 2014	Dec. 31, 2014 MMBTU
Cash Flow Hedging [Member] \| Natural Gas Contracts
Derivative [Line Items]
Forecast of commodity requirements, maximum length of time used	18 months
Natural gas contracts, notional amounts (in millions of BTUs)	3,370,000		3,850,000
Derivative, Additional Cash Paid on Settlement of Hedge	$ (1,200,000)
Derivative, Cash Received on Hedge		500,000
Cash flow hedge loss to be reclassified within 12 months	1,600,000
Minimum [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	40.00%
Maximum [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	70.00%
Other Income (Expense) [Member]
Derivative [Line Items]
Gain (loss) on derivative, net	(399,000)	0
Other Income (Expense) [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts
Derivative [Line Items]
Contracts where hedge accounting was not elected	(295,000)	0
Other Income (Expense) [Member] \| Not Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member] \| Natural Gas Contracts
Derivative [Line Items]
Gain (loss) on derivative, net	$ (104,000)	$ 0