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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 03, 2012	Dec. 31, 2012 segment institution	Dec. 31, 2011 institution	Dec. 31, 2010
Summary of Significant Accounting Policies
Number of reporting segments		1
Stock split ratio declared by board of directors	2
Cash and Cash Equivalents
Number of financial institutions		1	1
Properties and Equipment
Amortization of unproved properties included in Depreciation, Depletion, and Amortization		$ 18.1	$ 32.5	$ 47.6
Gathering and pipeline systems and equipment | Minimum
Properties and Equipment
Estimated useful life		10 years
Gathering and pipeline systems and equipment | Maximum
Properties and Equipment
Estimated useful life		25 years
Pipeline and transmission systems | Minimum
Properties and Equipment
Estimated useful life		12 years
Pipeline and transmission systems | Maximum
Properties and Equipment
Estimated useful life		25 years
Gathering and compression equipment | Maximum
Properties and Equipment
Estimated useful life		10 years
Storage equipment and facilities | Minimum
Properties and Equipment
Estimated useful life		10 years
Storage equipment and facilities | Maximum
Properties and Equipment
Estimated useful life		16 years
Buildings | Minimum
Properties and Equipment
Estimated useful life		25 years
Buildings | Maximum
Properties and Equipment
Estimated useful life		40 years
Other assets | Minimum
Properties and Equipment
Estimated useful life		3 years
Other assets | Maximum
Properties and Equipment
Estimated useful life		10 years

X

- Definition

Represents the noncash expense charged against earnings to recognize amortization of unproved properties based on past drilling and development experience and average property lives, included in depreciation, depletion, and amortization in the consolidated statement of operations.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of financial institutions wherein cash and cash equivalents are primarily concentrated.

+ References

No definition available.

+ Details

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X

- Definition

The number of reportable segments of the entity.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the conversion ratio used in the calculation of a stock split.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

-URI http://asc.fasb.org/extlink&oid=6525746



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

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