Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures - Purchase Price Allocation and Other Disclosures (Details)

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Acquisitions and Divestitures - Purchase Price Allocation and Other Disclosures (Details) (Santos Sales Agreement, USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2012
Mereenie Operating Joint Venture
May 25, 2012
Dingo Joint Venture
May 25, 2012
Palm Valley Joint Venture [Member]
Disposal Group, Other Information [Abstract]          
Ownership Interest Sold     35.00%    
Goodwill, Written off Related to Sale of Business Unit   $ 2,500,000      
Joint Venture, Ownership Interest Sold by Third Party       66.00% 48.00%
Other Payments to Acquire Businesses   17,500,000      
Disposal Group, Cost of Disposed Entity [Abstract]          
Consideration received, net purchase price per Santos SA 25,493,000        
Consideration received, purchase price adjustments 1,138,000        
Consideration received total 26,631,000        
Disposal Group, Consideration Received Allocation [Abstract]          
Allocation of the consideration received, proved oil and gas properties (Palm Valley) 3,403,000        
Allocation of the consideration received, unproved oil and gas properties (Dingo) 2,957,000        
Allocation of the consideration received, land, buildings, and equipment (Palm Valley) 370,000        
Total allocation of the fair value received 6,730,000        
Mereenie liabilities given up, net 2,805,000        
Gain on sale of assets $ (36,166,000)