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Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |
Oil and natural gas sales | $ 77,025 | $ 59,784 | $ 80,445
Operating costs and expenses: |  |  |
Production expense | 39,697 | 37,586 | 40,096
Exploration expense | 7 | 5 | 10,409
Depreciation, depletion and amortization | 6,457 | 6,926 | 32,998
General and administrative expense | 10,377 | 9,561 | 12,294
Impairment of proved properties |  | 88 | 81,322
Other operating expense |  | 8,853 |
General and administrative related to shareholder matters |  | (332) | 2,372
Bad debt expense and other | 452 | 1,222 | 2,968
Total operating costs and expenses | 56,990 | 63,909 | 182,459
Other operating income (expense), net | (84) | (266) | (1,092)
Operating income (loss) | 19,951 | (4,391) | (103,106)
Other income (expense): |  |  |
Interest expense, net | (1,414) | (2,613) | (1,325)
Other, net | 2,113 | (2,015) | (1,536)
Total other income (expense) | 699 | (4,628) | (2,861)
Income (loss) from continuing operations before income taxes | 20,650 | (9,019) | (105,967)
Income tax expense | 10,378 | 9,248 | 14,587
Income (loss) from continuing operations | 10,272 | (18,267) | (120,554)
Loss from discontinued operations | (621) | (8,283) | (38,102)
Net income (loss) | $ 9,651 | $ (26,550) | $ (158,656)
Basic net income (loss) per share: |  |  |
Income (loss) from continuing operations | $ 0.17 | $ (0.31) | $ (2.07)
Loss from discontinued operations | (0.01) | (0.14) | (0.65)
Net income (loss) per share | $ 0.16 | $ (0.45) | $ (2.72)
Basic weighted average shares outstanding | 58,717 | 58,384 | 58,289
Diluted net income (loss) per share: |  |  |
Income (loss) from continuing operations | $ 0.17 | $ (0.31) | $ (2.07)
Loss from discontinued operations | (0.01) | (0.14) | (0.65)
Net income (loss) per share | $ 0.16 | $ (0.45) | $ (2.72)
Diluted weighted average shares outstanding | 58,720 | 58,384 | 58,289

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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