Organization and Accounting Policies (Narrative) (Details) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Sep. 30, 2019
USD ($)
/ $
|
Sep. 30, 2018
USD ($)
|
Sep. 30, 2019
USD ($)
/ $
|
Sep. 30, 2018
USD ($)
|
Dec. 31, 2018
/ $
|
|
| Organization And Accounting Policies [Line Items] | |||||
| Exchange rate | / $ | 599.3 | 599.3 | 573.0 | ||
| Bad debt recovery (expense) | $ (54) | $ 157 | $ (30) | $ 68 | |
| Transfers between levels | 0 | 0 | $ 0 | 0 | |
| 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% | ||||
| Loss on foreign currency transactions | 100 | (0) | $ 300 | 100 | |
| Gabon | |||||
| Organization And Accounting Policies [Line Items] | |||||
| Receivable balance, gross, noncurrent | 8,000 | 8,000 | |||
| Receivable balance, net, noncurrent | 2,700 | 2,700 | |||
| Bad debt recovery (expense) | $ (5) | $ 200 | $ 24 | $ 100 | |
| X | ||||||||||
- Definition Future Working Interest Of Carried Partner Percentage No definition available.
|
| X | ||||||||||
- Definition Monthly Royalty Rate, Based On Production At The Published Price No definition available.
|
| X | ||||||||||
- Definition Organization And Accounting Policies [Line Items] No definition available.
|
| X | ||||||||||
- Definition Working Interest Of Carried Partner, Percentage No definition available.
|
| X | ||||||||||
- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. No definition available.
|
| X | ||||||||||
- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|