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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating revenues:        
Oil and natural gas $ 14,690 $ 13,454 $ 29,407 $ 23,841
Total operating revenues 681,112 600,064 1,427,033 1,167,468
Operating costs and expenses:        
Contract drilling 272,720 218,754 555,369 437,453
Pressure pumping 138,051 128,866 304,908 247,441
Oil and natural gas 2,583 2,103 5,313 4,100
Depreciation, depletion, amortization and impairment 128,477 102,749 251,430 198,964
Selling, general and administrative 16,719 16,749 30,587 32,724
Net gain on asset disposals (28,332) [1] (1,017) [1] (30,732) [1] (2,621) [1]
Provision for bad debts     1,600  
Total operating costs and expenses 530,218 468,204 1,118,475 918,061
Operating income 150,894 131,860 308,558 249,407
Other income (expense):        
Interest income 179 45 233 88
Interest expense (5,051) (3,514) (9,633) (7,403)
Other (144) 78 (89) 197
Total other expense (5,016) (3,391) (9,489) (7,118)
Income from continuing operations before income taxes 145,878 128,469 299,069 242,289
Income tax expense (benefit):        
Current (829) 15,449 6,681 19,031
Deferred 54,169 31,382 102,576 70,001
Total income tax expense 53,340 46,831 109,257 89,032
Income from continuing operations 92,538 81,638 189,812 153,257
Loss from discontinued operations, net of income taxes       (367)
Net income 92,538 81,638 189,812 152,890
Basic income (loss) per common share:        
Income from continuing operations $ 0.60 $ 0.53 $ 1.22 $ 0.99
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net income $ 0.60 $ 0.53 $ 1.22 $ 0.99
Diluted income (loss) per common share:        
Income from continuing operations $ 0.60 $ 0.52 $ 1.22 $ 0.98
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net income $ 0.60 $ 0.52 $ 1.22 $ 0.98
Weighted average number of common shares outstanding:        
Basic 153,269 153,556 153,947 153,340
Diluted 153,655 155,581 154,544 155,252
Cash dividends per common share $ 0.05 $ 0.05 $ 0.10 $ 0.10
Contract Drilling
        
Operating revenues:        
Oil and gas services 460,249 386,479 949,731 763,837
Pressure Pumping
        
Operating revenues:        
Oil and gas services $ 206,173 $ 200,131 $ 447,895 $ 379,790
[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.