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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Operating revenues:        
Contract drilling $ 386,479 $ 239,966 $ 763,837 $ 450,711
Pressure pumping 200,131 59,364 379,790 113,115
Oil and natural gas 13,454 7,662 23,841 14,764
Total operating revenues 600,064 306,992 1,167,468 578,590
Operating costs and expenses:        
Contract drilling 218,754 149,303 437,453 284,449
Pressure pumping 128,866 41,965 247,441 81,096
Oil and natural gas 2,103 1,780 4,100 3,842
Depreciation, depletion, amortization and impairment 102,749 78,783 198,964 154,499
Selling, general and administrative 16,749 12,343 32,724 23,806
Net (gain) loss on asset disposals (1,017) (21,939) (2,621) (21,690)
Provision for bad debts   (1,000)   (1,000)
Total operating costs and expenses 468,204 261,235 918,061 525,002
Operating income 131,860 45,757 249,407 53,588
Other income (expense):        
Interest income 45 1,380 88 1,567
Interest expense (3,514) (1,383) (7,403) (2,784)
Other 78 174 197 249
Total other income (expense) (3,391) 171 (7,118) (968)
Income from continuing operations before income taxes 128,469 45,928 242,289 52,620
Income tax expense (benefit):        
Current 15,449 1,935 19,031 (2,482)
Deferred 31,382 14,465 70,001 21,388
Total income tax expense 46,831 16,400 89,032 18,906
Income from continuing operations 81,638 29,528 153,257 33,714
Loss from discontinued operations, net of income taxes     (367)  
Net income $ 81,638 $ 29,528 $ 152,890 $ 33,714
Basic income (loss) per common share:        
Income from continuing operations $ 0.53 $ 0.19 $ 0.99 $ 0.22
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Basic net income per common share $ 0.53 $ 0.19 $ 0.99 $ 0.22
Diluted income (loss) per common share:        
Income from continuing operations $ 0.52 $ 0.19 $ 0.98 $ 0.22
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Diluted net income per common share $ 0.52 $ 0.19 $ 0.98 $ 0.22
Weighted average number of common shares outstanding:        
Basic 153,556 152,650 153,340 152,554
Diluted 155,581 152,871 155,252 152,852
Cash dividends per common share $ 0.05 $ 0.05 $ 0.10 $ 0.10