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Revenue (Revenues From Contracts With Customers) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 25,266 | $ 18,178 | $ 77,337 | $ 59,869
Glencore Oil Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from customer contracts | 18,931 | 17,757 | 74,587 | 57,913
Gabonese Government Share Of Profit Oil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from customer contracts |  | 2,749 | 2,193 | 9,039
U.S. Oil And Natural Gas Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from customer contracts |  | 16 |  | 46
Gabonese Government Share Of Profit Oil Taken In-Kind [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other items reported in revenue not associated with customer contracts | 9,385 |  | 9,385 |
Carried Interest Recoupment [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other items reported in revenue not associated with customer contracts | 573 | 431 | 1,929 | 1,818
Royalties [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Other items reported in revenue not associated with customer contracts | $ (3,623) | $ (2,775) | $ (10,757) | $ (8,947)

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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