Derivative Instruments Gain Loss Expected To Be Reclassified From Accumulated OCI Into Income Effective Portion Net

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Estimated Remaining Liability For Gas Purchase Commitment

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Fair Value Adjustment Of Debt

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Interest previously accrued and earned

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Senior Notes Maturity Period Due Two Thousand Fifteen

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Unrealized Gains Reported In Other Revenue

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

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The portion of gains on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

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-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Paragraph 4C

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-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

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-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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Derivatives And Fair Value Measurements (Narrative) (Details) (USD $)	1 Months Ended	9 Months Ended		12 Months Ended
	Aug. 31, 2011	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010 2009 Interest Rate Swaps [Member]	Dec. 31, 2010 2010 Interest Rate Swaps [Member]
Derivative [Line Items]
Senior notes maturity				2015
Cash received in settlement of hedge				$ 41,500,000
Interest previously accrued and earned					10,700,000
Fair value adjustment of debt					30,800,000
Estimated remaining liability					23,100,000
Gains and losses from the effective portion of derivative assets and liabilities held in AOCI expected to be reclassified into earnings		53,700,000
Hedge derivative ineffectiveness resulted in gains		1,700,000
Hedge derivative ineffectiveness resulted in losses			2,400,000
Unrealized gains reported in other revenue	$ 48,900,000