Interim Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Revenues	$ 336,072	$ 356,585	$ 367,438	$ 365,274	$ 389,447	$ 378,400	$ 356,901	$ 354,109	$ 1,425,369	$ 1,478,857	$ 1,305,529
Cost or revenues (exclusive of depreciation, depletion, amortization and accretion)	223,570	231,927	229,532	240,053	248,394	245,832	235,679	240,583	925,082	970,488	889,809
Depreciation, depletion, amortization and accretion	43,741	45,104	51,271	56,343	65,478	69,338	67,862	75,761	196,459	278,439	326,856
Gross Profit	68,761	79,554	86,635	68,878	75,575	63,230	53,360	37,765
Reduction in value of assets		9,628	7,557		322,713				17,185	322,713	10,390
Income (loss) from continuing operations	(6,162)	(20,506)	(18,441)	(32,644)	(317,014)	(23,436)	(33,817)	(53,136)	(77,753)	(427,403)	(180,315)
Loss from discontinued operations, net of income tax	(92,362)	(17,936)	(52,609)	(15,061)	(433,171)	1,620	7,427	(6,588)	(177,968)	(430,712)	(25,606)
Net loss	$ (98,524)	$ (38,442)	$ (71,050)	$ (47,705)	$ (750,185)	$ (21,816)	$ (26,390)	$ (59,724)	$ (255,721)	$ (858,115)	$ (205,921)
Loss from continuing operations, basic and diluted	$ (0.42)	$ (1.31)	$ (1.18)	$ (2.10)	$ (20.51)	$ (1.52)	$ (2.19)	$ (3.45)	$ (5.05)	$ (27.69)	$ (11.79)
Income (loss) from discontinued operations, basic and diluted	$ (6.26)	$ (1.15)	$ (3.37)	$ (0.97)	$ (28.03)	$ 0.10	$ 0.48	$ (0.43)	$ (11.56)	$ (27.90)	$ (1.68)