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Revenue (Narrative) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Initial crude oil sales and purchase agreement period | 1 year
Interval period, between lifting | 30 days
Monthly royalty rate, based on production at the published price | 13.00%
Working interest of carried partner, percentage | 7.50%
Future working interest of carried partner percentage | 10.00%
Income taxes paid in-kind with oil | $ 9,385
Foreign taxes payable attributable to sharing obligation | $ 1,800
Maximum [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Lifting period, time to complete | 2 days
Minimum [Member] |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Lifting period, time to complete | 1 day

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