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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues |  |  |  |
Sales and other operating revenues | $ 509,613 | $ 411,217 | $ 1,054,271 | $ 840,311
Gain (loss) on sale of assets | (1,334) | 3,809 | 130,648 | 3,831
Interest and other income (loss) | (33,782) | 22,436 | (45,803) | 23,615
Total revenues | 474,497 | 437,462 | 1,139,116 | 867,757
Costs and expenses |  |  |  |
Lease operating expenses | 111,179 | 156,530 | 233,321 | 315,633
Severance and ad valorem taxes | 10,742 | 13,439 | 21,955 | 26,076
Exploration expenses | 20,201 | 37,128 | 48,864 | 64,044
Selling and general expenses | 57,332 | 67,113 | 111,587 | 140,620
Depreciation, depletion and amortization | 234,992 | 255,239 | 471,146 | 541,388
Accretion of asset retirement obligations | 10,428 | 12,346 | 20,984 | 24,471
Impairment of assets |  |  |  | 95,088
Interest expense | 46,261 | 35,058 | 91,951 | 67,119
Interest capitalized | (1,116) | (608) | (2,209) | (2,449)
Other expense (benefit) | 6,377 | (7,516) | 8,534 | (7,932)
Total costs and expenses | 496,396 | 568,729 | 1,006,133 | 1,264,058
Income (loss) from continuing operations before income taxes | (21,899) | (131,267) | 132,983 | (396,301)
Income tax expense (benefit) | (4,545) | (134,172) | 92,842 | (199,721)
Income (loss) from continuing operations | (17,354) | 2,905 | 40,141 | (196,580)
Income (loss) from discontinued operations, net of income taxes | (217) | 25 | 752 | 708
NET INCOME (LOSS) | $ (17,571) | $ 2,930 | $ 40,893 | $ (195,872)
INCOME (LOSS) PER COMMON SHARE - BASIC |  |  |  |
Continuing operations | $ (0.10) | $ 0.02 | $ 0.23 | $ (1.14)
Discontinued operations |  |  | 0.01 |
Net income (loss) | (0.10) | 0.02 | 0.24 | (1.14)
INCOME (LOSS) PER COMMON SHARE - DILUTED |  |  |  |
Continuing operations | (0.10) | 0.02 | 0.23 | (1.14)
Discontinued operations |  |  | 0.01 |
Net income (loss) | (0.10) | 0.02 | 0.24 | (1.14)
Cash dividends per Common share | $ 0.25 | $ 0.35 | $ 0.50 | $ 0.70
Average Common shares outstanding |  |  |  |
Basic | 172,557,978 | 172,196,914 | 172,482,223 | 172,149,791
Diluted | 172,557,978 | 172,799,827 | 173,016,664 | 172,149,791

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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 Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 5.E) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355146-122828 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1278-109256 + Details
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