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Description Of Business And Significant Accounting Policies (Schedule Of Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable $ 1,608 $ 1,579
Revenue [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable 1,517 1,412
Joint Interest [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable 65 112
Other [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable $ 26 $ 55