Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details)

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Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total $ 1,797,025 $ 1,465,538
Colorado [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 5,083  
Bakken [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 96  
Southern Louisiana [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 263  
Ohio [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 1,791,538  
Other [Member]    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total $ 45