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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Revenue: |  |
Oil and gas sales | $ 93,215 | $ 66,883
Costs and Expenses: |  |
Lease operating expenses | 34,996 | 30,880
Depreciation, depletion and accretion | 36,154 | 34,006
Income tax (benefit) expense | 3,724 | (7,753)
Total Costs and Expenses | 74,874 | 57,133
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) | $ 18,341 | $ 9,750

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