Annual report pursuant to Section 13 and 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, unless otherwise specified
12 Months Ended 130 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant and Equipment [Abstract]        
Acquisition costs $ 512,636 $ 112,591 $ 661 $ 407
Exploration costs 0 0 0 0
Development costs 0 0 0 0
Total oil and gas properties not subject to amortization 512,636 112,591 661 407
Acquisition costs, Total 626,295      
Exploration costs, Total 0      
Development costs, Total 0      
Total oil and gas properties not subject to amortization $ 626,295 $ 138,623