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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 |  |

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- 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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- Definition Represents the number of financial institutions wherein cash and cash equivalents are primarily concentrated. + References No definition available. + Details
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- Definition The number of reportable segments of the entity. + References No definition available. + 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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- 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 + Details
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