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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating revenues and other income: |  |  |  |
Oil, gas, and NGL production revenue | $ 458,382 | $ 294,459 | $ 1,243,826 | $ 912,596
Net gain (loss) on divestiture activity | 786 | (1,895) | 425,656 | (131,565)
Other operating revenues | 201 | 2,815 | 3,398 | 7,807
Total operating revenues and other income | 459,369 | 295,379 | 1,672,880 | 788,838
Operating expenses: |  |  |  |
Oil, gas, and NGL production expense | 127,638 | 122,651 | 365,917 | 385,073
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 201,105 | 134,599 | 483,343 | 425,643
Exploration | 13,061 | 14,119 | 40,844 | 38,919
Abandonment and impairment of unproved properties | 9,055 | 0 | 26,615 | 157
General and administrative | 29,464 | 27,564 | 86,066 | 84,618
Net derivative (gain) loss | 178,026 | 80,599 | 249,304 | (89,364)
Other operating expenses, net | 9,664 | 999 | 14,219 | 10,109
Total operating expenses | 568,013 | 380,531 | 1,266,308 | 855,155
Income (loss) from operations | (108,644) | (85,152) | 406,572 | (66,317)
Interest expense | (38,111) | (44,091) | (122,850) | (135,639)
Loss on extinguishment of debt | (26,722) | 0 | (26,722) | (35)
Other non-operating income, net | 806 | 861 | 3,017 | 1,581
Income (loss) before income taxes | (172,671) | (128,382) | 260,017 | (200,410)
Income tax (expense) benefit | 36,748 | 39,270 | (61,342) | 65,825
Net income (loss) | $ (135,923) | $ (89,112) | $ 198,675 | $ (134,585)
Basic weighted-average common shares outstanding | 112,107 | 111,575 | 111,836 | 111,366
Diluted weighted-average common shares outstanding | 112,107 | 111,575 | 113,600 | 111,366
Basic net income (loss) per common share | $ (1.21) | $ (0.80) | $ 1.78 | $ (1.21)
Diluted net income (loss) per common share | (1.21) | (0.80) | 1.75 | (1.21)
Dividends per common share | $ 0.05 | $ 0.05 | $ 0.10 | $ 0.10

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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