CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Operating revenues:
Oil and natural gas	$ 14,724		$ 13,827		$ 38,844		$ 45,329
Total operating revenues	845,628		730,907		2,281,072		2,057,262
Operating costs and expenses:
Contract drilling	278,195		239,768		784,572		729,588
Pressure pumping	281,016		204,050		722,801		560,486
Oil and natural gas	3,275		3,602		9,421		9,738
Depreciation, depletion, amortization and impairment	237,825		140,734		538,573		414,351
Selling, general and administrative	18,896		19,580		58,117		55,296
Net gain on asset disposals	(3,870)	[1]	(1,378)	[1]	(8,705)	[1]	(2,286)	[1]
Total operating costs and expenses	815,337		606,356		2,104,779		1,767,173
Operating income	30,291		124,551		176,293		290,089
Other income (expense):
Interest income	234		293		618		716
Interest expense, net of amount capitalized	(6,993)		(7,503)		(21,430)		(21,210)
Other	0		380		3		780
Total other expense	(6,759)		(6,830)		(20,809)		(19,714)
Income before income taxes	23,532		117,721		155,484		270,375
Income tax expense (benefit):
Current	48,618		25,916		101,233		35,824
Deferred	(41,062)		17,385		(50,830)		63,133
Total income tax expense	7,556		43,301		50,403		98,957
Net income	15,976		74,420		105,081		171,418
Net income per common share:
Basic	$ 0.11		$ 0.51		$ 0.72		$ 1.17
Diluted	$ 0.11		$ 0.51		$ 0.71		$ 1.16
Weighted average number of common shares outstanding:
Basic	144,798		144,446		143,778		144,915
Diluted	146,991		145,432		146,101		145,840
Cash dividends per common share	$ 0.10		$ 0.05		$ 0.30		$ 0.15
Contract Drilling
Operating revenues:
Oil and gas services	482,212		457,871		1,346,698		1,266,944
Pressure Pumping
Operating revenues:
Oil and gas services	$ 348,692		$ 259,209		$ 895,530		$ 744,989

[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.