Interim Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Revenues	$ 354,418	$ 326,225	$ 356,271	$ 413,133	$ 545,150	$ 601,396	$ 710,784	$ 917,235	$ 1,450,047	$ 2,774,565	$ 4,556,622
Costs and Expenses [Abstract]
Cost of services and rentals	321,132	258,168	258,635	285,339	397,548	420,485	465,533	582,246	1,123,274	1,865,812	2,734,833
Depreciation, depletion, amortization and accretion - services	117,954	123,308	132,037	136,672	144,818	146,757	158,352	162,220	509,971	612,147	650,814
Reduction in value of assets	35,961	1,963	460,283	2,198	175,618	755,632	807,637		500,405	1,738,887
Net income (loss) from continuing operations	(166,259)	(113,913)	(468,632)	(84,536)	(214,547)	(816,587)	(775,132)	(1,497)	(833,340)	(1,807,763)	280,790
Loss from discontinued operations, net of tax	(44,982)	(4,085)	(2,225)	(2,267)	(22,848)	(4,610)	(9,857)	(9,640)	(53,559)	(46,955)	(22,973)
Net income (loss)	$ (211,241)	$ (117,998)	$ (470,857)	$ (86,803)	$ (237,395)	$ (821,197)	$ (784,989)	$ (11,137)	$ (886,899)	$ (1,854,718)	$ 257,817
Earnings Per Share [Abstract]
Continuing operations, basic	$ (1.10)	$ (0.75)	$ (3.09)	$ (0.56)	$ (1.43)	$ (5.42)	$ (5.15)	$ (0.02)	$ (5.50)	$ (12.02)	$ 1.81
Continuing operations, diluted									(5.50)	(12.02)	1.79
Discontinued operations, basic	$ (0.30)	$ (0.03)	$ (0.02)	$ (0.01)	$ (0.15)	$ (0.03)	$ (0.07)	$ (0.06)	(0.35)	(0.31)	(0.15)
Discontinued operations, diluted									$ (0.35)	$ (0.31)	$ (0.14)