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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | [1]
Revenues |  |
Revenue from sales to customers | $ 606,954 | $ 509,035
Gain (loss) on crude contracts | (29,502) | 37,077
Gain on sale of assets and other income | 8,153 | 130,528
Total revenues | 585,605 | 676,640
Costs and Expenses |  |
Lease operating expenses | 136,496 | 122,142
Severance and ad valorem taxes | 12,157 | 11,213
Exploration expenses, including undeveloped lease amortization | 28,928 | 28,663
Selling and general expenses | 51,417 | 51,255
Depreciation, depletion and amortization | 230,733 | 236,154
Accretion of asset retirement obligations | 9,914 | 10,556
Other expense (benefit) | (11,048) | 2,157
Total costs and expenses | 458,597 | 462,140
Operating income from continuing operations | 127,008 | 214,500
Other income (loss) |  |
Interest and other income (loss) | 15,084 | (15,021)
Interest expense, net | (45,049) | (44,597)
Total other loss | (29,965) | (59,618)
Income from continuing operations before income taxes | 97,043 | 154,882
Income tax expense (benefit) | (71,647) | 97,387
Income from continuing operations | 168,690 | 57,495
Income (loss) from discontinued operations, net of income taxes | (437) | 969
NET INCOME | $ 168,253 | $ 58,464
INCOME PER COMMON SHARE - BASIC |  |
Continuing operations | $ 0.98 | $ 0.33
Discontinued operations | (0.01) | 0.01
Net Income | 0.97 | 0.34
INCOME PER COMMON SHARE - DILUTED |  |
Continuing operations | 0.97 | 0.33
Discontinued operations | (0.01) | 0.01
Net Income | 0.96 | 0.34
Cash dividends per Common share | $ 0.25 | $ 0.25
Average Common shares outstanding |  |
Basic | 172,805,065 | 172,422,449
Diluted | 174,619,524 | 173,088,691
[1] | Reclassified to conform to current presentation (see Notes A and B).

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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=96866604&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=82851474&loc=d3e511914-122862 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition A tax assessed on oil and gas production. + 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(2)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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