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Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 142 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Acquisition costs $ 342,857 $ 493,981 $ 106,704 $ 1,068
Acquisition costs, total 944,610      
Exploration costs 0 0 0 0
Exploration costs, total 0      
Development costs 0 0 0 0
Development costs, total 0      
Capitalized interest 5,980 0 0 0
Capitalized interest, total 5,980      
Total oil and gas properties not subject to amortization 348,837 493,981 106,704 1,068
Total oil and gas properties not subject to amortization, total 950,590 626,295    
Colorado [Member]
       
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 6,054      
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 542      
Ohio [Member]
       
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total 943,654      
Other [Member]
       
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]        
Total oil and gas properties not subject to amortization, total $ 45