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Acquisition (Preliminary Purchase Price Allocation) (Details) $ in Thousands | 1 Months Ended
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Jun. 30, 2019 USD ($) MMBoe | Dec. 31, 2018 USD ($) MMBoe
Business Acquisition [Line Items] |  |
Fair value of net assets contributed |  | $ 0
Contingent consideration |  | 89,444
NCI in acquired assets |  | $ 0
Petrobas America Inc |  |
Business Acquisition [Line Items] |  |
Proved Developed Reserves (Energy) | MMBoe |  | 97
Cash consideration paid |  | $ 788,724
Fair value of net assets contributed |  | 154,469
Contingent consideration |  | 52,540
NCI in acquired assets |  | 248,933
Total purchase consideration |  | 1,244,666
Fair value of Property, plant and equipment |  | 1,627,429
Other assets |  | 5,628
Less: Asset retirement obligations |  | (388,391)
Total net assets |  | 1,244,666
LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. |  |
Business Acquisition [Line Items] |  |
Proved Developed Reserves (Energy) | MMBoe | 67 |
Cash consideration paid | $ 1,226,261 |
Total purchase consideration |  | 1,315,705
Fair value of Property, plant and equipment |  | 1,340,206
Other assets |  | 12,771
Less: Asset retirement obligations |  | (37,272)
Total net assets |  | $ 1,315,705

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- Definition Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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