Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total $ 1,187,637 $ 950,590
Colorado [Member]
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 5,933  
Bakken [Member]
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 295  
Southern Louisiana [Member]
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 636  
Ohio [Member]
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total 1,180,728  
Other [Member]
    
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]    
Total oil and gas properties not subject to amortization, total $ 45