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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating revenues:      
Oil and natural gas $ 57,257 $ 59,930 $ 50,559
Total operating revenues 2,716,034 2,723,414 2,565,943
Operating costs and expenses:      
Contract drilling 968,754 1,075,491 972,778
Pressure pumping 744,243 580,878 561,398
Oil and natural gas 12,909 11,303 9,615
Depreciation, depletion, amortization and impairment 597,469 526,614 437,279
Selling, general and administrative 73,852 64,473 64,271
Net gain on asset disposals (3,384) [1] (33,806) [1] (4,999) [1]
Provision for bad debts 0 1,100 0
Total operating costs and expenses 2,393,843 2,226,053 2,040,342
Operating income 322,191 497,361 525,601
Other income (expense):      
Interest income 918 554 187
Interest expense (28,359) (22,750) (15,652)
Other 1,691 508 582
Total other expense (25,750) (21,688) (14,883)
Income from continuing operations before income taxes 296,441 475,673 510,718
Income tax expense:      
Current 57,863 15,760 28,971
Deferred 50,569 160,436 158,967
Total income tax expense 108,432 176,196 187,938
Income from continuing operations 188,009 299,477 322,780
Loss from discontinued operations, net of income taxes     (367)
Net income 188,009 299,477 322,413
Basic income per common share:      
Income from continuing operations $ 1.29 $ 1.96 $ 2.08
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00
Net income $ 1.29 $ 1.96 $ 2.08
Diluted income per common share:      
Income from continuing operations $ 1.28 $ 1.96 $ 2.06
Loss from discontinued operations, net of income taxes $ 0.00 $ 0.00 $ 0.00
Net income $ 1.28 $ 1.96 $ 2.06
Weighted average number of common shares outstanding:      
Basic 144,356 151,144 153,871
Diluted 145,303 151,699 155,304
Cash dividends per common share $ 0.20 $ 0.20 $ 0.20
Contract Drilling
      
Operating revenues:      
Oil and gas services 1,679,611 1,821,713 1,669,581
Pressure Pumping
      
Operating revenues:      
Oil and gas services $ 979,166 $ 841,771 $ 845,803
[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.