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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.