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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Operating revenues: |  |  |  |
Oil and natural gas | $ 16,785 |  | $ 14,717 |
Total operating revenues | 667,039 |  | 745,921 |
Operating costs and expenses: |  |  |  |
Contract drilling | 247,072 |  | 282,649 |
Pressure pumping | 168,156 |  | 166,857 |
Oil and natural gas | 2,922 |  | 2,730 |
Depreciation, depletion, amortization and impairment | 136,435 |  | 122,953 |
Selling, general and administrative | 17,397 |  | 13,868 |
Net (gain) loss on asset disposals | 125 | [1] | (2,400) | [1]
Provision for bad debts |  |  | 1,600 |
Total operating costs and expenses | 572,107 |  | 588,257 |
Operating income | 94,932 |  | 157,664 |
Other income (expense): |  |  |  |
Interest income | 173 |  | 54 |
Interest expense | (6,766) |  | (4,582) |
Other | 19 |  | 55 |
Total other expense | (6,574) |  | (4,473) |
Income before income taxes | 88,358 |  | 153,191 |
Income tax expense: |  |  |  |
Current | 7,573 |  | 7,510 |
Deferred | 24,555 |  | 48,407 |
Total income tax expense | 32,128 |  | 55,917 |
Net income | 56,230 |  | 97,274 |
Net income per common share: |  |  |  |
Basic | $ 0.38 |  | $ 0.62 |
Diluted | $ 0.38 |  | $ 0.62 |
Weighted average number of common shares outstanding: |  |  |  |
Basic | 144,827 |  | 154,625 |
Diluted | 146,783 |  | 155,401 |
Cash dividends per common share | $ 0.05 |  | $ 0.05 |
Contract Drilling |  |  |  |
Operating revenues: |  |  |  |
Oil and gas services | 419,094 |  | 489,482 |
Pressure Pumping |  |  |  |
Operating revenues: |  |  |  |
Oil and gas services | $ 231,160 |  | $ 241,722 |
[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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