Accounting Policies And Disclosures Schedule of Error Correction - Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Oil and natural gas properties, full cost method (including unevaluated costs of $21,377 and $18,803, respectively)	$ 341,488	$ 614,668
Property, plant and equipment, net of accumulated depletion and depreciation	440,820	728,780
Total assets	668,464	1,214,302
Retained deficit	(2,411,179)	(1,939,461)
Total stockholders' equity	(1,628,102)	(1,137,871)
Total liabilities and stockholders' equity	668,464	$ 1,214,302
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Oil and natural gas properties, full cost method (including unevaluated costs of $21,377 and $18,803, respectively)	403,248
Property, plant and equipment, net of accumulated depletion and depreciation	502,580
Total assets	730,224
Retained deficit	(2,349,419)
Total stockholders' equity	(1,566,342)
Total liabilities and stockholders' equity	730,224
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Oil and natural gas properties, full cost method (including unevaluated costs of $21,377 and $18,803, respectively)	(61,760)
Property, plant and equipment, net of accumulated depletion and depreciation	(61,760)
Total assets	(61,760)
Retained deficit	(61,760)
Total stockholders' equity	(61,760)
Total liabilities and stockholders' equity	$ (61,760)