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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |
Deferred tax assets | $ 126,252,000 | $ 108,787,000
Valuation allowance | 126,252,000 | 84,628,000
Interest or penalties accrued | 0 | 0
Deferred tax assets |  | 24,159,000
Uncertain tax positions | $ 0 | $ 0
Prior Production Sharing Contract, Through September 17, 2018 [Member] |  |
Income Taxes [Line Items] |  |
Entitled percent for consortium after initial royalty percentage | 70.00% |
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] |  |
Income Taxes [Line Items] |  |
Entitled percent for consortium after initial royalty percentage | 80.00% |
Production Sharing Contract, After September 16, 2028 [Member] |  |
Income Taxes [Line Items] |  |
Entitled percent for consortium after initial royalty percentage | 70.00% |
Minimum [Member] |  |
Income Taxes [Line Items] |  |
Allocation of remaining profit production, government payments, percentage | 50.00% |
Minimum [Member] | Domestic Country [Member] |  |
Income Taxes [Line Items] |  |
Foreign tax credit carryforward, expiration dates | Dec. 31, 2035 |
Minimum [Member] | Foreign Country [Member] |  |
Income Taxes [Line Items] |  |
Foreign tax credit carryforward, expiration dates | Dec. 31, 2021 |
Maximum [Member] |  |
Income Taxes [Line Items] |  |
Allocation of remaining profit production, government payments, percentage | 60.00% |
Maximum [Member] | Domestic Country [Member] |  |
Income Taxes [Line Items] |  |
Foreign tax credit carryforward, expiration dates | Dec. 31, 2037 |
Maximum [Member] | Foreign Country [Member] |  |
Income Taxes [Line Items] |  |
Foreign tax credit carryforward, expiration dates | Dec. 31, 2025 |

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