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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating revenues:      
Oil and natural gas $ 59,930 $ 50,559 $ 30,425
Total operating revenues 2,723,414 2,565,943 1,462,931
Operating costs and expenses:      
Contract drilling 1,075,491 972,778 655,678
Pressure pumping 580,878 561,398 235,100
Oil and natural gas 11,303 9,615 7,020
Depreciation, depletion, amortization and impairment 526,614 437,279 333,493
Selling, general and administrative 64,473 64,271 53,042
Net gain on asset disposals (33,806) [1] (4,999) [1] (22,812) [1]
Provision for bad debts 1,100    (2,000)
Acquisition-related expenses     2,485
Total operating costs and expenses 2,226,053 2,040,342 1,262,006
Operating income 497,361 525,601 200,925
Other income (expense):      
Interest income 554 187 1,674
Interest expense (22,750) (15,652) (12,772)
Other 508 582 927
Total other expense (21,688) (14,883) (10,171)
Income from continuing operations before income taxes 475,673 510,718 190,754
Income tax expense (benefit):      
Current 15,760 28,971 (74,634)
Deferred 160,436 158,967 147,490
Total income tax expense 176,196 187,938 72,856
Income from continuing operations 299,477 322,780 117,898
Loss from discontinued operations, net of income taxes    (367) (956)
Net income 299,477 322,413 116,942
Basic income (loss) per common share:      
Income from continuing operations $ 1.96 $ 2.08 $ 0.77
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ (0.01)
Net income $ 1.96 $ 2.08 $ 0.76
Diluted income (loss) per common share:      
Income from continuing operations $ 1.96 $ 2.06 $ 0.76
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ (0.01)
Net income $ 1.96 $ 2.06 $ 0.76
Weighted average number of common shares outstanding:      
Basic 151,144 153,871 152,772
Diluted 151,699 155,304 153,276
Cash dividends per common share $ 0.20 $ 0.20 $ 0.20
Contract Drilling
      
Operating revenues:      
Oil and gas services 1,821,713 1,669,581 1,081,898
Pressure Pumping
      
Operating revenues:      
Oil and gas services $ 841,771 $ 845,803 $ 350,608
[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.