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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Operating revenues: |  |
Oil, gas, and NGL production revenue | $ 333,198 | $ 211,823
Net gain (loss) on divestiture activity | 37,463 | (69,021)
Other operating revenues | 2,077 | 274
Total operating revenues and other income | 372,738 | 143,076
Operating expenses: |  |
Oil, gas, and NGL production expense | 138,046 | 144,543
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 137,812 | 214,207
Exploration | 11,978 | 15,273
Impairment of proved properties | 0 | 269,785
Abandonment and impairment of unproved properties | 0 | 2,311
General and administrative | 29,224 | 32,238
Net derivative gain | (114,774) | (14,228)
Other operating expenses | 4,859 | 5,672
Total operating expenses | 207,145 | 669,801
Income (loss) from operations | 165,593 | (526,725)
Non-operating income (expense): |  |
Interest expense | (46,953) | (31,088)
Gain (loss) on extinguishment of debt | (35) | 15,722
Other, net | 335 | 6
Income (loss) before income taxes | 118,940 | (542,085)
Income tax (expense) benefit | (44,506) | 194,875
Net income (loss) | $ 74,434 | $ (347,210)
Basic weighted-average common shares outstanding | 111,258 | 68,077
Diluted weighted-average common shares outstanding | 111,329 | 68,077
Basic net income (loss) per common share | $ 0.67 | $ (5.10)
Diluted net income (loss) per common share | 0.67 | (5.10)
Dividends per common share | $ 0.05 | $ 0.05

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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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