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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Operating revenues:        
Oil and natural gas $ 14,933 $ 11,837 $ 44,340 $ 35,678
Total operating revenues 643,631 673,828 2,070,664 1,841,296
Operating costs and expenses:        
Contract drilling 265,542 264,418 820,911 701,871
Pressure pumping 129,139 149,577 434,047 397,018
Oil and natural gas 2,704 2,306 8,017 6,406
Depreciation, depletion, amortization and impairment 142,393 110,713 393,823 309,677
Selling, general and administrative 17,222 15,957 47,809 48,681
Net gain on asset disposals (1,963) [1] (1,437) [1] (32,695) [1] (4,058) [1]
Provision for bad debts     1,600  
Total operating costs and expenses 555,037 541,534 1,673,512 1,459,595
Operating income 88,594 132,294 397,152 381,701
Other income (expense):        
Interest income 149 47 382 135
Interest expense (7,207) (3,835) (16,840) (11,238)
Other 624 375 535 572
Total other expense (6,434) (3,413) (15,923) (10,531)
Income from continuing operations before income taxes 82,160 128,881 381,229 371,170
Income tax expense:        
Current 2,199 6,795 8,880 25,826
Deferred 29,155 40,158 131,731 110,159
Total income tax expense 31,354 46,953 140,611 135,985
Income from continuing operations 50,806 81,928 240,618 235,185
Loss from discontinued operations, net of income taxes          (367)
Net income 50,806 81,928 240,618 234,818
Basic income (loss) per common share:        
Income from continuing operations $ 0.34 $ 0.53 $ 1.56 $ 1.52
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net income $ 0.34 $ 0.53 $ 1.56 $ 1.52
Diluted income (loss) per common share:        
Income from continuing operations $ 0.33 $ 0.53 $ 1.56 $ 1.50
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net income $ 0.33 $ 0.53 $ 1.56 $ 1.50
Weighted average number of common shares outstanding:        
Basic 149,846 152,617 152,570 153,661
Diluted 150,522 154,120 153,066 155,369
Cash dividends per common share $ 0.05 $ 0.05 $ 0.15 $ 0.15
Contract Drilling
        
Operating revenues:        
Oil and gas services 446,735 436,827 1,396,466 1,200,664
Pressure Pumping
        
Operating revenues:        
Oil and gas services $ 181,963 $ 225,164 $ 629,858 $ 604,954
[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.