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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues and other income |  |  |  |
Revenue from sales to customers | $ 1,751,709 | $ 2,817,111 | $ 1,806,473 |
(Loss) gain on crude contracts | 202,661 | (856) | (41,975) |
Gain on sale of assets and other income | 12,971 | 12,798 | 26,903 |
Total revenues and other income | 1,967,341 | 2,829,053 | 1,791,401 |
Costs and expenses |  |  |  |
Lease operating expenses | 600,076 | 605,180 | 353,832 |
Severance and ad valorem taxes | 28,526 | 47,959 | 52,072 |
Transportation, gathering and processing | 172,399 | 176,315 | 75,043 |
Exploration expenses, including undeveloped lease amortization | 86,479 | 95,105 | 101,812 |
Selling and general expenses | 140,243 | 232,736 | 205,192 |
Restructuring expenses | 49,994 | 0 | 0 |
Depreciation, depletion and amortization | 987,239 | 1,147,842 | 775,614 | [1]
Accretion of asset retirement obligations | 42,136 | 40,506 | 27,119 | [1]
Impairment of assets | 1,206,284 | 0 | 20,000 | [1]
Other (benefit) expense | 16,274 | 38,117 | (34,870) |
Total costs and expenses | 3,329,650 | 2,383,760 | 1,575,814 |
Operating (loss) income from continuing operations | (1,362,309) | 445,293 | 215,587 |
Other income (loss) |  |  |  |
Interest and other income (loss) | (17,303) | (22,520) | 7,774 |
Interest expense, net | (169,423) | (219,275) | (180,359) |
Total other loss | (186,726) | (241,795) | (172,585) |
(Loss) income from continuing operations before income taxes | (1,549,035) | 203,498 | 43,002 |
Income tax (benefit) expense | (293,741) | 14,683 | (126,136) |
(Loss) income from continuing operations | (1,255,294) | 188,815 | 169,138 |
(Loss) income from discontinued operations, net of income taxes | (7,151) | 1,064,487 | 250,348 | [1]
Net income (loss) including noncontrolling interest | (1,262,445) | 1,253,302 | 419,486 | [1]
Less: Net (loss) income attributable to noncontrolling interest | (113,668) | 103,570 | 8,392 |
NET INCOME (LOSS) ATTRIBUTABLE TO MURPHY | $ (1,148,777) | $ 1,149,732 | $ 411,094 |
(LOSS) INCOME PER COMMON SHARE – BASIC |  |  |  |
Continuing operations (in USD per share) | $ (7.43) | $ 0.52 | $ 0.92 |
Discontinued operations (in USD per share) | (0.05) | 6.49 | 1.46 |
Net Income (loss) (in USD per share) | (7.48) | 7.01 | 2.38 |
(LOSS) INCOME PER COMMON SHARE – DILUTED |  |  |  |
Continuing operations (in USD per share) | (7.43) | 0.52 | 0.92 |
Discontinued operations (in USD per share) | (0.05) | 6.46 | 1.44 |
Net income (loss) (in USD per share) | (7.48) | 6.98 | 2.36 |
Cash dividends per Common share (in USD per share) | $ 0.625 | $ 1.00 | $ 1.00 |
Average Common shares outstanding (thousands) |  |  |  |
Basic (in shares) | 153,507,109 | 163,992,427 | 172,974,491 |
Diluted (in shares) | 153,507,109 | 164,812,428 | 174,208,765 |
[1] | Reclassified to conform with current presentation

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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=68064819&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration