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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating revenues:      
Oil and natural gas $ 50,559 $ 30,425 $ 21,218
Total operating revenues 2,565,943 1,462,931 781,946
Operating costs and expenses:      
Contract drilling 972,778 655,678 357,742
Pressure pumping 561,398 235,100 124,100
Oil and natural gas 9,615 7,020 7,341
Depreciation, depletion, amortization and impairment 437,279 333,493 289,847
Selling, general and administrative 64,271 53,042 43,935
Net (gain) loss on asset disposals (4,999) [1] (22,812) [1] 3,385 [1]
Provision for bad debts 0 (2,000) 3,810
Acquisition-related expenses   2,485  
Total operating costs and expenses 2,040,342 1,262,006 830,160
Operating income (loss) 525,601 200,925 (48,214)
Other income (expense):      
Interest income 187 1,674 381
Interest expense (15,652) (12,772) (4,148)
Other 582 927 426
Total other expense (14,883) (10,171) (3,341)
Income (loss) from continuing operations before income taxes 510,718 190,754 (51,555)
Income tax expense (benefit):      
Current 28,971 (74,634) (119,038)
Deferred 158,967 147,490 101,443
Total income tax expense (benefit) 187,938 72,856 (17,595)
Income (loss) from continuing operations 322,780 117,898 (33,960)
Loss from discontinued operations, net of income taxes (367) (956) (4,330)
Net income (loss) 322,413 116,942 (38,290)
Basic income (loss) per common share:      
Income (loss) from continuing operations $ 2.08 $ 0.77 $ (0.22)
Loss from discontinued operations, net of income taxes $ 0.00 $ (0.01) $ (0.03)
Net income (loss) $ 2.08 $ 0.76 $ (0.25)
Diluted income (loss) per common share:      
Income (loss) from continuing operations $ 2.06 $ 0.76 $ (0.22)
Loss from discontinued operations, net of income taxes $ 0.00 $ (0.01) $ (0.03)
Net income (loss) $ 2.06 $ 0.76 $ (0.25)
Weighted average number of common shares outstanding:      
Basic 153,871 152,772 152,069
Diluted 155,304 153,276 152,069
Cash dividends per common share $ 0.20 $ 0.20 $ 0.20
Contract Drilling
      
Operating revenues:      
Oil and gas services 1,669,581 1,081,898 599,287
Pressure Pumping
      
Operating revenues:      
Oil and gas services $ 845,803 $ 350,608 $ 161,441
[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.