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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, 2017 | Dec. 31, 2016
Revenue: |  |
Oil and gas sales | $ 66,883 | $ 38,306
Costs and Expenses: |  |
Lease operating expenses | 30,880 | 27,544
Depreciation, depletion and accretion | 34,006 | 27,534
Income tax (benefit) expense | (7,753) | (5,870)
Total Costs and Expenses | 57,133 | 49,208
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) | $ 9,750 | $ (10,902)

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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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