Quarterly report pursuant to Section 13 or 15(d)

Sale of Amadeus Basin Assets (Details)

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Sale of Amadeus Basin Assets (Details)
$ in Millions
 6 Months Ended
May 18, 2016
USD ($)
May 18, 2016
AUD
Mar. 31, 2014
AUD
shares
Dec. 31, 2016
AUD
AUD / Gigajoule
Central Petroleum Limited        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Ownership percentage     11.00% 0.90%
Amadeus Basin        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Amount paid in exchange for assets     AUD 20,000,000  
Customary purchase price adjustments     AUD 800,000  
Discount rate       10.00%
Amadeus Basin | Maximum        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Bonus discharge amount       AUD 7,000,000
Amadeus Basin | Palm Valley        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Royalty rate       25.00%
AUD/Gigajoule gas price trigger for first ten years | AUD / Gigajoule       5.00
AUD/Gigajoule gas price trigger for following five years | AUD / Gigajoule       6.00
Royalty rate term, first 10 years       10 years
Royalty rate, following five years       5 years
Amadeus Basin | Central Petroleum Limited        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Shares issued during period for acquisitions (in shares) | shares     39,500,000.0  
Mereenie Bonus        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Amount paid in exchange for assets $ 2.5 AUD 3,500,000