Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Narrative) (Details)

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Property And Equipment (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool $ 93,500   $ 93,500    
Capitalized general and administrative costs 7,300 $ 5,900 20,800 $ 19,100  
Capitalized costs of oil and natural gas properties excluded from amortization 2,018,803   2,018,803   $ 1,465,538
Impairment of oil and gas properties $ 594,776 $ 0 $ 594,776 $ 0  
Minimum [Member]          
Property, Plant and Equipment [Line Items]          
Expected number of years amortization will commence     3 years    
Maximum [Member]          
Property, Plant and Equipment [Line Items]          
Expected number of years amortization will commence     5 years