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Property, Plant And Equipment (Aging of Capitalized Exploratory Well Costs) (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) item | Mar. 31, 2017 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 176,263 | $ 166,423 | $ 175,640 | $ 148,500
No. of Wells | 12 | 11 |  |
No. of Projects | 5 | 5 |  |
Zero to One Year [Member] |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 13,642 | $ 48,202 |  |
No. of Wells | 2 | 2 |  |
No. of Projects | 1 | 2 |  |
One to Two Years [Member] |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 27,757 | $ 53,729 |  |
No. of Wells | 1 | 3 |  |
No. of Projects | 1 | 3 |  |
Two to Three Years [Member] |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 49,642 |  |  |
No. of Wells | 2 |  |  |
No. of Projects | 2 |  |  |
Three Years or More [Member] |  |  |  |
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] |  |  |  |
Amount | $ | $ 85,222 | $ 64,492 |  |
No. of Wells | 7 | 6 |  |
No. of Projects | 1 |  |  |

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- Definition Projects that have Exploratory Well Costs that have been Capitalized + References No definition available. + Details
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- Definition The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
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- Definition The number of productive exploratory wells drilled in the geographic area. A productive well is a well that is not a dry well. The number of wells drilled refers to the number of wells (holes) completed at any time during the fiscal years, regardless when drilling was initiated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1205 -Paragraph (a) -Subparagraph (1) + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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