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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating revenues and other income: |  |  |
Oil, gas, and NGL production revenue | $ 1,178,426 | $ 1,499,905 | $ 2,481,544
Net gain on divestiture activity | 37,074 | 43,031 | 646
Marketed gas system revenue | 0 | 9,485 | 24,897
Other operating revenues | 1,950 | 4,544 | 15,220
Total operating revenues and other income | 1,217,450 | 1,556,965 | 2,522,307
Operating Expenses: |  |  |
Oil, gas, and NGL production expense | 597,565 | 723,633 | 715,878
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 790,745 | 921,009 | 767,532
Exploration | 65,641 | 120,569 | 129,857
Impairment of proved properties | 354,614 | 468,679 | 84,480
Abandonment and impairment of unproved properties | 80,367 | 78,643 | 75,638
Impairment of other property and equipment | 0 | 49,369 | 0
General and administrative | 126,428 | 157,668 | 167,103
Change In Net Profits Plan Liability | (7,200) | (19,525) | (29,849)
Net derivative (gain) loss | 250,633 | (408,831) | (583,264)
Marketed gas system expense | 0 | 13,922 | 24,460
Other operating expenses | 17,972 | 30,612 | 4,658
Total operating expenses | 2,276,765 | 2,135,748 | 1,356,493
Income (loss) from operations | (1,059,315) | (578,783) | 1,165,814
Non-operating income (expense): |  |  |
Interest expense | (158,685) | (128,149) | (98,554)
Gain (loss) on extinguishment of debt | 15,722 | (16,578) | 0
Other, net | 362 | 649 | (2,561)
Income (loss) before income taxes | (1,201,916) | (722,861) | 1,064,699
Income tax (expense) benefit | 444,172 | 275,151 | (398,648)
Net income (loss) | $ (757,744) | $ (447,710) | $ 666,051
Earnings Per Share, Basic [Abstract] |  |  |
Basic weighted-average common shares outstanding | 76,568 | 67,723 | 67,230
Basic net income (loss) per common share | $ (9.90) | $ (6.61) | $ 9.91
Earnings Per Share, Diluted [Abstract] |  |  |
Diluted weighted-average common shares outstanding | 76,568 | 67,723 | 68,044
Diluted net income (loss) per common share | $ (9.90) | $ (6.61) | $ 9.79

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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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