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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 23, 2013 | Jul. 23, 2012 | Dec. 31, 2013 item | Dec. 31, 2012 item | Dec. 31, 2011
Summary of Significant Accounting Policies |  |  |  |  |
Number of operating segments |  |  | 1 |  |
Stock split ratio declared by the Board of Directors | 2 | 2 |  |  |
Cash and Cash Equivalents |  |  |  |  |
Number of financial institutions |  |  | 2 | 1 |
Properties and Equipment |  |  |  |  |
Amortization of unproved properties included in depreciation, depletion, and amortization |  |  | $ 53.6 | $ 18.1 | $ 32.5
Assets legally restricted for purposes of settling asset retirement obligations |  |  | $ 0 |  |
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 Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + 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=27012166&loc=d3e187143-122770 + Details
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