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CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share data) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating revenues and other income: |  |  |
Oil, gas, and NGL production revenue | $ 2,597,915 | $ 1,126,188 | $ 1,585,750
Other operating income | 24,979 | 485 | 4,355
Total operating revenues and other income | 2,622,894 | 1,126,673 | 1,590,105
Operating expenses: |  |  |
Oil, gas, and NGL production expense | 505,416 | 391,217 | 500,709
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 774,386 | 784,987 | 823,798
Exploration | 39,296 | 40,997 | 51,500
Impairment | 35,000 | 1,016,013 | 33,842
General and administrative | 111,945 | 99,160 | 132,797
Net derivative (gain) loss | 901,659 | (161,576) | 97,539
Other operating expense, net | 46,069 | 24,825 | 19,888
Total operating expenses | 2,413,771 | 2,195,623 | 1,660,073
Income (loss) from operations | 209,123 | (1,068,950) | (69,968)
Interest expense | (160,353) | (163,892) | (159,102)
Net gain (loss) on extinguishment of debt | (2,139) | 280,081 | 0
Other non-operating expense, net | (464) | (3,944) | (1,974)
Income (loss) before income taxes | 46,167 | (956,705) | (231,044)
Income tax (expense) benefit | (9,938) | 192,091 | 44,043
Net income (loss) | $ 36,229 | $ (764,614) | $ (187,001)
Basic weighted-average common shares outstanding | 119,043 | 113,730 | 112,544
Diluted weighted-average common shares outstanding | 123,690 | 113,730 | 112,544
Basic net income (loss) per common share | $ 0.30 | $ (6.72) | $ (1.66)
Diluted net income (loss) per common share | $ 0.29 | $ (6.72) | $ (1.66)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e62136-109447 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration