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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating revenues:        
Oil and natural gas $ 13,827 $ 14,933 $ 45,329 $ 44,340
Total operating revenues 730,907 643,631 2,057,262 2,070,664
Operating costs and expenses:        
Contract drilling 239,768 265,542 729,588 820,911
Pressure pumping 204,050 129,139 560,486 434,047
Oil and natural gas 3,602 2,704 9,738 8,017
Depreciation, depletion, amortization and impairment 140,734 142,393 414,351 393,823
Selling, general and administrative 19,580 17,222 55,296 47,809
Net gain on asset disposals (1,378) [1] (1,963) [1] (2,286) [1] (32,695) [1]
Provision for bad debts       1,600
Total operating costs and expenses 606,356 555,037 1,767,173 1,673,512
Operating income 124,551 88,594 290,089 397,152
Other income (expense):        
Interest income 293 149 716 382
Interest expense (7,503) (7,207) (21,210) (16,840)
Other 380 624 780 535
Total other expense (6,830) (6,434) (19,714) (15,923)
Income before income taxes 117,721 82,160 270,375 381,229
Income tax expense:        
Current 25,916 2,199 35,824 8,880
Deferred 17,385 29,155 63,133 131,731
Total income tax expense 43,301 31,354 98,957 140,611
Net income 74,420 50,806 171,418 240,618
Net income per common share:        
Basic $ 0.51 $ 0.34 $ 1.17 $ 1.56
Diluted $ 0.51 $ 0.33 $ 1.16 $ 1.56
Weighted average number of common shares outstanding:        
Basic 144,446 149,846 144,915 152,570
Diluted 145,432 150,522 145,840 153,066
Cash dividends per common share $ 0.05 $ 0.05 $ 0.15 $ 0.15
Contract Drilling
        
Operating revenues:        
Oil and gas services 457,871 446,735 1,266,944 1,396,466
Pressure Pumping
        
Operating revenues:        
Oil and gas services $ 259,209 $ 181,963 $ 744,989 $ 629,858
[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.