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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.