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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, 2016 | Mar. 31, 2015
Operating revenues: |  |
Oil, gas, and NGL production revenue | $ 211,823 | $ 393,315
Net loss on divestiture activity (note 3) | (69,021) | (35,802)
Other operating revenues | 274 | 8,421
Total operating revenues and other income | 143,076 | 365,934
Operating expenses: |  |
Oil, gas, and NGL production expense | 144,543 | 196,151
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 214,207 | 217,401
Exploration | 15,273 | 37,407
Impairment of proved properties | 269,785 | 55,526
Abandonment and impairment of unproved properties | 2,311 | 11,627
General and administrative | 32,238 | 43,639
Change in Net Profits Plan liability | (1,260) | (4,334)
Derivative gain | (14,228) | (154,167)
Other operating expenses | 6,932 | 17,119
Total operating expenses | 669,801 | 420,369
Loss from operations | (526,725) | (54,435)
Non-operating income (expense): |  |
Interest income | 6 | 571
Interest expense | (31,088) | (32,647)
Gain on Extinguishment of Debt | 15,722 | 0
Loss before income taxes | (542,085) | (86,511)
Income tax benefit | 194,875 | 33,453
Net loss | $ (347,210) | $ (53,058)
Basic weighted-average common shares outstanding | 68,077 | 67,463
Diluted weighted-average common shares outstanding | 68,077 | 67,463
Basic net loss per common share | $ (5.10) | $ (0.79)
Diluted net loss per common share | (5.10) | (0.79)
Dividends per common share | $ 0.05 | $ 0.05

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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 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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