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Derivative Instruments - Narrative (Details) MMcf in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) MMcf	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) MMcf
Derivative Instruments, Gain (Loss) [Line Items]
Deferred net gains in accumulated other comprehensive income (loss), net of tax		$ 133,800,000		$ 217,100,000
Net unrealized gains on derivative commodity instruments		$ 98,300,000		$ 153,200,000
Maximum additional collateral as percentage of derivative liability		100.00%
Aggregate fair value of derivative instruments with credit-risk related contingencies		$ 24,700,000
Collateral posted		$ 0
Cash Flow Hedging | Commodity Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax gain recorded within gain on sale / exchange of assets	$ 28,000,000		$ 28,000,000
Absolute quantities of derivative commodity instruments that have been designated and qualify as cash flow or fair value hedges (in Bcf) | MMcf		616		624

X

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualified as the effective portion of cash flow hedges, excluding certain interest rate swap transactions.

+ References

No definition available.

+ Details

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X

- Definition

The upper limit of the percentage of derivative liability that the entity may be required to post with counterparties.

+ References

No definition available.

+ Details

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

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.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4H



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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X

- Definition

The amount of gain reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

+ 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 (e)



-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve 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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