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CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
OPERATING REVENUES |  |  |  |
Operating revenues | $ 288,374 | $ 470,468 | $ 658,769 | $ 1,103,892
Gain on derivative instruments | 43,974 | 63,649 | 60,036 | 71,906
Total operating revenues | 332,348 | 534,117 | 718,805 | 1,175,798
OPERATING EXPENSES |  |  |  |
Direct operations | 17,423 | 18,093 | 34,667 | 36,427
Transportation and gathering | 135,249 | 141,689 | 278,581 | 279,022
Taxes other than income | 3,352 | 3,640 | 7,090 | 9,487
Exploration | 4,579 | 4,504 | 6,769 | 10,548
Depreciation, depletion and amortization | 94,622 | 96,147 | 194,757 | 188,405
General and administrative | 23,166 | 22,889 | 56,595 | 53,979
Total operating expenses | 278,391 | 286,962 | 578,459 | 577,868
Earnings (loss) on equity method investments | 0 | 3,650 | (59) | 7,334
Loss on sale of assets | (241) | 0 | (170) | (1,500)
INCOME FROM OPERATIONS | 53,716 | 250,805 | 140,117 | 603,764
Interest expense, net | 14,543 | 14,567 | 28,754 | 26,748
Other expense | 48 | 143 | 114 | 287
Income before income taxes | 39,125 | 236,095 | 111,249 | 576,729
Income tax expense | 8,751 | 55,086 | 26,965 | 132,957
NET INCOME | $ 30,374 | $ 181,009 | $ 84,284 | $ 443,772
Earnings per share |  |  |  |
Basic (in dollars per share) | $ 0.08 | $ 0.43 | $ 0.21 | $ 1.05
Diluted (in dollars per share) | $ 0.08 | $ 0.43 | $ 0.21 | $ 1.05
Weighted-average common shares outstanding |  |  |  |
Basic (shares) | 398,576 | 422,141 | 398,460 | 422,626
Diluted (shares) | 401,279 | 424,349 | 400,219 | 424,550
Natural gas |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | $ 288,286 | $ 470,482 | $ 658,626 | $ 1,103,656
Other |  |  |  |
OPERATING REVENUES |  |  |  |
Operating revenues | $ 88 | $ (14) | $ 143 | $ 236

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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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