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Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Apr. 02, 2014
Derivative disclosures
Unrealized losses included in accumulated other comprehensive income and will reclassified into natural gas and crude oil revenues , pretax		$ 73.4
Unrealized gain (loss) included in accumulated other comprehensive income will reclassified into natural gas and crude oil revenues , net of tax		44.2
Expected reclassification of income (loss) from commodity derivative to natural gas and crude oil revenues over the next 6 months	$ 30.4
Derivatives Designated as Hedges | Natural Gas Collars with contract period of Jul. 2014 - Dec. 2014
Derivative disclosures
Volume	169,800.0
Derivatives Designated as Hedges | Natural Gas Collars with contract period of Jul. 2014 - Dec. 2014 | Minimum
Derivative disclosures
Collar Floor Price	3.60
Collar Ceiling Price	4.22
Derivatives Designated as Hedges | Natural Gas Collars with contract period of Jul. 2014 - Dec. 2014 | Maximum
Derivative disclosures
Collar Floor Price	4.37
Collar Ceiling Price	4.80
Derivatives Designated as Hedges | Natural Gas Collars with contract period of Jul. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Collar Floor Price	4.13
Collar Ceiling Price	4.51
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of Jul. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Volume	53,600.0
Swaps Weighted Average	4.05
Derivatives Designated as Hedges | Crude Oil Swaps with contract period of Jul. 2014 - Dec. 2014 | Weighted Average
Derivative disclosures
Volume	368.0
Swaps Weighted Average	97.00

X

- 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 remainder of the year.

+ References

No definition available.

+ Details

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- Definition

Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units.

+ References

No definition available.

+ Details

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- Definition

Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

+ References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

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- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

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- Details

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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