Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidated Statements of Operations [Abstract]
Services	$ 534,959	$ 836,666	$ 1,220,423	$ 1,639,005
Rentals	175,825	270,886	407,596	529,965
Total Revenues	710,784	1,107,552	1,628,019	2,168,970
Costs and expenses:
Cost of services (exclusive of items shown separately below)	465,533	650,293	1,047,779	1,301,898
Cost of Services	387,565	552,411	869,558	1,106,173
Cost of rentals	77,968	97,882	178,221	195,725
Depreciation, depletion, amortization and accretion	158,352	160,965	320,572	323,283
General and administrative expenses	129,661	146,853	280,623	302,772
Reduction in value of assets	807,637		807,637
Income from operations	(850,399)	149,441	(828,592)	241,017
Other income (expense):
Interest expense, net	(25,382)	(24,560)	(48,591)	(48,441)
Other Nonoperating Income (Expense)	(6,524)	606	(7,495)	571
Income from continuing operations before income taxes	(882,305)	125,487	(884,678)	193,147
Income taxes	(107,173)	46,430	(108,051)	71,464
Net income (loss) from continuing operations	(775,132)	79,057	(776,627)	121,683
Income (loss) from discontinued operations, net of tax	(9,857)	(3,895)	(19,497)	(9,849)
Net income	$ (784,989)	$ 75,162	$ (796,124)	$ 111,834
Earnings per share information:
Continuing operations	$ (5.15)	$ 0.51	$ (5.17)	$ 0.77
Discontinued operations	(0.07)	(0.03)	(0.13)	(0.06)
Basic earnings per share	(5.22)	0.48	(5.30)	0.71
Continuing operations	(5.15)	0.50	(5.17)	0.76
Discontinued operations	(0.07)	(0.03)	(0.13)	(0.06)
Diluted earnings per share	(5.22)	0.47	(5.30)	0.70
Common Stock, Dividends, Per Share, Cash Paid	$ 0.08	$ 0.08	$ 0.16	$ 0.16
Weighted average common shares used in computing earnings per share:
Basic	150,485	156,399	150,196	157,302
Incremental common shares from stock based compensation		2,702		2,692
Diluted	150,485	159,101	150,196	159,994