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Summary of Significant Accounting Policies - Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Proceeds from insurance reimbursement | $ 7.2 |
Gulf of Mexico Oil and Gas Properties [Member] |  |
Asset retirement obligation, cash paid to settle |  | $ 5.2

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- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3367-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to operating activities. It excludes insurance settlements classified as investing cash flows, for example, insurance settlements related to fixed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3337-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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