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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Operating revenues: |  |  |  |
Oil, gas, and NGL production revenue | $ 291,142 | $ 441,256 | $ 502,965 | $ 834,571
Net gain (loss) on divestiture activity (note 3) | 50,046 | 71,884 | (18,975) | 36,082
Other operating revenues | 626 | 3,006 | 900 | 11,427
Total operating revenues and other income | 341,814 | 516,146 | 484,890 | 882,080
Operating expenses: |  |  |  |
Oil, gas, and NGL production expense | 148,591 | 173,685 | 293,134 | 369,836
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 211,020 | 219,704 | 425,227 | 437,105
Exploration | 13,187 | 25,541 | 28,460 | 62,948
Impairment of proved properties | 0 | 12,914 | 269,785 | 68,440
Abandonment and impairment of unproved properties | 38 | 5,819 | 2,349 | 17,446
General and administrative | 28,200 | 42,605 | 60,438 | 86,244
Change in Net Profits Plan liability | 3,125 | (4,476) | 1,865 | (8,810)
Derivative (gain) loss | 163,351 | 80,929 | 149,123 | (73,238)
Other operating expenses | 4,851 | 10,304 | 11,783 | 27,423
Total operating expenses | 572,363 | 567,025 | 1,242,164 | 987,394
Loss from operations | (230,549) | (50,879) | (757,274) | (105,314)
Non-operating income (expense): |  |  |  |
Interest income | 5 | 25 | 11 | 596
Interest expense | (34,035) | (30,779) | (65,123) | (63,426)
Gain (loss) on extinguishment of debt | 0 | (16,578) | 15,722 | (16,578)
Loss before income taxes | (264,579) | (98,211) | (806,664) | (184,722)
Income tax benefit | 95,898 | 40,703 | 290,773 | 74,156
Net loss | $ (168,681) | $ (57,508) | $ (515,891) | $ (110,566)
Basic weighted-average common shares outstanding | 68,102 | 67,483 | 68,090 | 67,473
Diluted weighted-average common shares outstanding | 68,102 | 67,483 | 68,090 | 67,473
Basic net loss per common share | $ (2.48) | $ (0.85) | $ (7.58) | $ (1.64)
Diluted net loss per common share | (2.48) | (0.85) | (7.58) | (1.64)
Dividends per common share | $ 0.00 | $ 0.00 | $ 0.05 | $ 0.05

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- Definition The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced. + References No definition available. + Details
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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 The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 + Details
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- Definition Costs incurred to operate and maintain an entities' wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=56951519&loc=d3e65139-109465 + Details
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