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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Operating revenues: |  |  |  |  |
Total operating revenues |  | $ 422,251 | $ 845,628 | $ 1,552,711 | $ 2,281,072
Operating costs and expenses: |  |  |  |  |
Contract drilling |  | 136,718 | 278,195 | 503,376 | 784,572
Pressure pumping |  | 138,597 | 281,016 | 494,078 | 722,801
Oil and natural gas |  | 2,519 | 3,275 | 8,096 | 9,421
Depreciation, depletion, amortization and impairment |  | 332,151 | 237,825 | 689,457 | $ 538,573
Impairment of goodwill |  | 124,561 |  | 124,561 |
Selling, general and administrative |  | 18,582 | 18,896 | 70,595 | $ 58,117
Net gain on asset disposals | [1] | (1,362) | (3,870) | (7,276) | (8,705)
Total operating costs and expenses |  | 751,766 | 815,337 | 1,882,887 | 2,104,779
Operating income (loss) |  | (329,515) | 30,291 | (330,176) | 176,293
Other income (expense): |  |  |  |  |
Interest income |  | 323 | 234 | 924 | 618
Interest expense, net of amount capitalized |  | (9,254) | (6,993) | (27,044) | (21,430)
Other |  | 16 |  | 16 | 3
Total other expense |  | (8,915) | (6,759) | (26,104) | (20,809)
Income (loss) before income taxes |  | (338,430) | 23,532 | (356,280) | 155,484
Income tax expense (benefit): |  |  |  |  |
Current |  | (42,446) | 48,618 | (10,221) | 101,233
Deferred |  | (70,006) | (41,062) | (110,231) | (50,830)
Total income tax expense (benefit) |  | (112,452) | 7,556 | (120,452) | 50,403
Net income (loss) |  | $ (225,978) | $ 15,976 | $ (235,828) | $ 105,081
Net income (loss) per common share: |  |  |  |  |
Basic |  | $ (1.54) | $ 0.11 | $ (1.61) | $ 0.72
Diluted |  | $ (1.54) | $ 0.11 | $ (1.61) | $ 0.71
Weighted average number of common shares outstanding: |  |  |  |  |
Basic |  | 145,662 | 144,798 | 145,317 | 143,778
Diluted |  | 145,662 | 146,991 | 145,317 | 146,101
Cash dividends per common share |  | $ 0.10 | $ 0.10 | $ 0.30 | $ 0.30
Contract Drilling |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and gas services |  | $ 261,817 | $ 482,212 | $ 951,616 | $ 1,346,698
Operating costs and expenses: |  |  |  |  |
Impairment of goodwill |  | 0 |  |  |
Pressure Pumping |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and gas services |  | 154,407 | 348,692 | 580,752 | 895,530
Operating costs and expenses: |  |  |  |  |
Impairment of goodwill |  | 125,000 |  |  |
Oil And Natural Gas |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and natural gas |  | $ 6,027 | $ 14,724 | $ 20,343 | $ 38,844
[1] | Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51677171&loc=d3e3636-108311 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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- 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/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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