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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Operating revenues: |  |  |  |  |
Total operating revenues |  | $ 472,761 | $ 757,276 | $ 1,130,460 | $ 1,435,444
Operating costs and expenses: |  |  |  |  |
Contract drilling |  | 153,848 | 255,318 | 366,658 | 506,377
Pressure pumping |  | 142,756 | 241,977 | 355,481 | 441,785
Oil and natural gas |  | 2,779 | 2,872 | 5,577 | 6,146
Depreciation, depletion, amortization and impairment |  | 181,924 | 153,426 | 357,306 | 300,748
Selling, general and administrative |  | 19,216 | 19,548 | 52,013 | 39,221
Net gain on asset disposals | [1] | (2,998) | (3,091) | (5,914) | (4,835)
Total operating costs and expenses |  | 497,525 | 670,050 | 1,131,121 | 1,289,442
Operating income (loss) |  | (24,764) | 87,226 | (661) | 146,002
Other income (expense): |  |  |  |  |
Interest income |  | 318 | 208 | 601 | 384
Interest expense, net of amount capitalized |  | $ (9,249) | (7,249) | $ (17,790) | (14,437)
Other |  |  | 3 |  | 3
Total other expense |  | $ (8,931) | (7,038) | $ (17,189) | (14,050)
Income (loss) before income taxes |  | (33,695) | 80,188 | (17,850) | 131,952
Income tax expense (benefit): |  |  |  |  |
Current |  | 1,705 | 25,680 | 32,225 | 52,615
Deferred |  | (16,425) | 225 | (40,225) | (9,768)
Total income tax expense (benefit) |  | (14,720) | 25,905 | (8,000) | 42,847
Net income (loss) |  | $ (18,975) | $ 54,283 | $ (9,850) | $ 89,105
Net income (loss) per common share: |  |  |  |  |
Basic |  | $ (0.13) | $ 0.37 | $ (0.07) | $ 0.62
Diluted |  | $ (0.13) | $ 0.37 | $ (0.07) | $ 0.61
Weighted average number of common shares outstanding: |  |  |  |  |
Basic |  | 145,300 | 143,622 | 145,142 | 143,259
Diluted |  | 145,984 | 146,029 | 145,712 | 145,586
Cash dividends per common share |  | $ 0.10 | $ 0.10 | $ 0.20 | $ 0.20
Contract Drilling |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and gas services |  | $ 288,321 | $ 438,583 | $ 689,799 | $ 864,486
Pressure Pumping |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and gas services |  | 176,624 | 306,577 | 426,345 | 546,838
Oil And Natural Gas |  |  |  |  |
Operating revenues: |  |  |  |  |
Oil and natural gas |  | $ 7,816 | $ 12,116 | $ 14,316 | $ 24,120
[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 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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