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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (in thousands, except per share amounts) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Operating revenues: |  |  |  |
Oil, gas, and NGL production revenue | $ 329,165 | $ 366,615 | $ 832,130 | $ 1,201,186
Net gain on divestiture activity (note 3) | 22,388 | 2,415 | 3,413 | 38,497
Other operating revenues | 1,107 | 2,121 | 2,007 | 13,548
Total operating revenues and other income | 352,660 | 371,151 | 837,550 | 1,253,231
Operating expenses: |  |  |  |
Oil, gas, and NGL production expense | 152,524 | 184,568 | 445,658 | 554,404
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 193,966 | 243,879 | 619,193 | 680,984
Exploration | 13,482 | 19,679 | 41,942 | 82,627
Impairment of proved properties | 8,049 | 55,990 | 277,834 | 124,430
Abandonment and impairment of unproved properties | 3,568 | 6,600 | 5,917 | 24,046
General and administrative | 32,679 | 37,782 | 93,117 | 124,026
Change in Net Profits Plan liability | (8,314) | (4,364) | (6,449) | (13,174)
Derivative (gain) loss | (28,037) | (212,253) | 121,086 | (285,491)
Other operating expenses | 2,397 | 7,166 | 14,180 | 34,589
Total operating expenses | 370,314 | 339,047 | 1,612,478 | 1,326,441
Income (loss) from operations | (17,654) | 32,104 | (774,928) | (73,210)
Non-operating income (expense): |  |  |  |
Interest expense | (47,206) | (33,157) | (112,329) | (96,583)
Gain (loss) on extinguishment of debt | 0 | 0 | 15,722 | (16,578)
Other, net | 221 | 27 | 232 | 623
Loss before income taxes | (64,639) | (1,026) | (871,303) | (185,748)
Income tax benefit | 23,732 | 4,140 | 314,505 | 78,296
Net income (loss) | $ (40,907) | $ 3,114 | $ (556,798) | $ (107,452)
Basic weighted-average common shares outstanding | 78,468 | 67,961 | 71,574 | 67,638
Diluted weighted-average common shares outstanding | 78,468 | 68,119 | 71,574 | 67,638
Basic net income (loss) per common share | $ (0.52) | $ 0.05 | $ (7.78) | $ (1.59)
Diluted net income (loss) per common share | (0.52) | 0.05 | (7.78) | (1.59)
Dividends per common share | $ 0.05 | $ 0.05 | $ 0.10 | $ 0.10

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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=56951519&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=50486907&loc=d3e511914-122862 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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