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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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Results of operations expense including income tax expense from oil and gas producing activities.

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

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Income tax expense for oil and gas producing activities.

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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Total revenues from oil and gas producing activities.

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