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Supplemental Oil and Gas Disclosures (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |
Results of Operations for Producing Activities Table |
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (In Thousands)
Oil and gas sales revenues |  | $ | 538 |  |  | $ | 751 |  |  | $ | 2,438 |
Production (lifting) costs |  | 1,234 |  |  | 643 |  |  | 921 |
Excess decommissioning and abandonment costs |  | — |  |  | 2,593 |  |  | 2,665 |
Accretion expense |  | 1,382 |  |  | 1,362 |  |  | 1,375 |
Pretax income (loss) from producing activities |  | (2,078 | ) |  | (3,847 | ) |  | (2,523 | )
Income tax expense (benefit) |  | — |  |  | — |  |  | — |
Results of oil and gas producing activities |  | $ | (2,078 | ) |  | $ | (3,847 | ) |  | $ | (2,523 | )

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