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Consolidated Condensed Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating revenues:    
Oil and natural gas $ 12,004 $ 16,785
Total operating revenues 678,168 667,039
Operating costs and expenses:    
Contract drilling 251,059 247,072
Pressure pumping 199,808 168,156
Oil and natural gas 3,274 2,922
Depreciation, depletion, amortization and impairment 147,322 136,435
Selling, general and administrative 19,673 17,397
Net (gain) loss on asset disposals (1,744) [1] 125 [1]
Total operating costs and expenses 619,392 572,107
Operating income 58,776 94,932
Other income (expense):    
Interest income 176 173
Interest expense, net of capitalized interest of $1,667 in 2014 and $2,281 in 2013 (7,188) (6,766)
Other   19
Total other expense (7,012) (6,574)
Income before income taxes 51,764 88,358
Income tax expense (benefit):    
Current 26,935 7,573
Deferred (9,993) 24,555
Total income tax expense 16,942 32,128
Net income 34,822 56,230
Net income per common share:    
Basic $ 0.24 $ 0.38
Diluted $ 0.24 $ 0.38
Weighted average number of common shares outstanding:    
Basic 142,892 144,827
Diluted 145,099 146,783
Cash dividends per common share $ 0.10 $ 0.05
Contract Drilling
    
Operating revenues:    
Oil and gas services 425,903 419,094
Pressure Pumping
    
Operating revenues:    
Oil and gas services $ 240,261 $ 231,160
[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.