Accounting Policies And Disclosures Schedule of Error Correction - Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment of Oil and Gas Properties		$ 164,518	$ 135	$ 241,929	$ 135
Costs and Expenses		226,034	98,714	464,913	306,050
Operating income (loss)		(167,047)	64,784	(237,794)	67,266
Results of Operations, Income before Income Taxes		(182,060)	18,818	(465,882)	(70,090)
Net Income (Loss) Attributable to Parent		(184,212)	23,757	(471,718)	(71,171)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ (189,871)	$ 8,868	$ (495,267)	$ (98,272)
Earnings (loss) per common share - basic		$ (1.05)	$ 0.13	$ (2.68)	$ (0.41)
Earnings (loss) per common share - diluted	[1]	$ (1.05)	$ 0.13	$ (2.68)	$ (0.41)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment of Oil and Gas Properties		$ 102,758		$ 180,169
Costs and Expenses		164,274		403,153
Operating income (loss)		(105,287)		(176,034)
Results of Operations, Income before Income Taxes		(120,300)		(404,122)
Net Income (Loss) Attributable to Parent		(122,452)		(409,958)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ (128,111)		$ (433,507)
Earnings (loss) per common share - basic		$ (0.69)		$ (2.33)
Earnings (loss) per common share - diluted		$ (0.69)		$ (2.33)
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Impairment of Oil and Gas Properties		$ 61,760		$ 61,760
Costs and Expenses		61,760		61,760
Operating income (loss)		(61,760)		(61,760)
Results of Operations, Income before Income Taxes		(61,760)		(61,760)
Net Income (Loss) Attributable to Parent		(61,760)		(61,760)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		$ (61,760)		$ (61,760)
Earnings (loss) per common share - basic		$ (0.36)		$ (0.35)
Earnings (loss) per common share - diluted		$ (0.36)		$ (0.35)

[1] For the three months ended September 30, 2015, 6.4 million shares associated with our stock options and 0.9 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the three months ended September 30, 2014, 6.6 million shares associated with our stock options and 1.2 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2015, 6.4 million shares associated with our stock options and 0.9 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations. For the nine months ended September 30, 2014, 6.6 million shares associated with our stock options and 0.8 million shares associated with our unvested RSUs were antidilutive and, therefore, excluded from the diluted share calculations.