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Description Of Business And Significant Accounting Policies (Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable $ 1,624 $ 1,608
Revenue [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable 1,545 1,517
Joint Interest [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable 49 65
Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
accounts receivable $ 30 $ 26