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Properties and Equipment (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net changes in capitalized exploratory well costs |  |  |
Balance at beginning of period | $ 0 us-gaap_CapitalizedExploratoryWellCosts | $ 10,390 us-gaap_CapitalizedExploratoryWellCosts | $ 5,328 us-gaap_CapitalizedExploratoryWellCosts
Additions to capitalized exploratory well costs pending the determination of proved reserves | 10,557 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves | 0 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves | 10,390 us-gaap_CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves | 0 us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves | (10,198)us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves | 0 us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves
Capitalized exploratory well costs charged to expense | 0 us-gaap_CapitalizedExploratoryWellCostChargedToExpense | (192)us-gaap_CapitalizedExploratoryWellCostChargedToExpense | (5,328)us-gaap_CapitalizedExploratoryWellCostChargedToExpense
Balance at end of period | $ 10,557 us-gaap_CapitalizedExploratoryWellCosts | $ 0 us-gaap_CapitalizedExploratoryWellCosts | $ 10,390 us-gaap_CapitalizedExploratoryWellCosts

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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + 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)(1) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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- Definition Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well. + 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)(3) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + 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=8451039&loc=SL6806780-109447 + Details
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- Details
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- Definition Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found. + 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)(2) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
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