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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Operating revenues: |  |  |  |
Oil and natural gas | $ 14,717 |  | $ 10,387 |
Total operating revenues | 745,921 |  | 567,404 |
Operating costs and expenses: |  |  |  |
Contract drilling | 282,649 |  | 218,699 |
Pressure pumping | 166,857 |  | 118,575 |
Oil and natural gas | 2,730 |  | 1,997 |
Depreciation, depletion, amortization and impairment | 122,953 |  | 96,215 |
Selling, general and administrative | 13,868 |  | 15,975 |
Net gain on asset disposals | (2,400) | [1] | (1,604) | [1]
Provision for bad debts | 1,600 |  |  |
Total operating costs and expenses | 588,257 |  | 449,857 |
Operating income | 157,664 |  | 117,547 |
Other income (expense): |  |  |  |
Interest income | 54 |  | 43 |
Interest expense | (4,582) |  | (3,889) |
Other | 55 |  | 119 |
Total other expense | (4,473) |  | (3,727) |
Income from continuing operations before income taxes | 153,191 |  | 113,820 |
Income tax expense: |  |  |  |
Current | 7,510 |  | 3,582 |
Deferred | 48,407 |  | 38,619 |
Total income tax expense | 55,917 |  | 42,201 |
Income from continuing operations | 97,274 |  | 71,619 |
Loss from discontinued operations, net of income taxes |  |  | (367) |
Net income | 97,274 |  | 71,252 |
Basic income (loss) per common share: |  |  |  |
Income from continuing operations | $ 0.62 |  | $ 0.46 |
Loss from discontinued operations, net of income taxes | $ 0.00 |  | $ 0.00 |
Net income | $ 0.62 |  | $ 0.46 |
Diluted income (loss) per common share: |  |  |  |
Income from continuing operations | $ 0.62 |  | $ 0.46 |
Loss from discontinued operations, net of income taxes | $ 0.00 |  | $ 0.00 |
Net income | $ 0.62 |  | $ 0.46 |
Weighted average number of common shares outstanding: |  |  |  |
Basic | 154,625 |  | 153,122 |
Diluted | 155,401 |  | 154,653 |
Cash dividends per common share | $ 0.05 |  | $ 0.05 |
Contract Drilling |  |  |  |
Operating revenues: |  |  |  |
Oil and gas services | 489,482 |  | 377,358 |
Pressure Pumping |  |  |  |
Operating revenues: |  |  |  |
Oil and gas services | $ 241,722 |  | $ 179,659 |
[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 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=6920599&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration