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COMMITMENTS AND CONTINGENCIES - Narrative (Details)
$ in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2020
AUD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jun. 12, 2020
USD ($)
Mar. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]          
Exploration expense   $ 149 $ 15    
Litigation settlement expense   0      
Cooper Basin          
Lessee, Lease, Description [Line Items]          
Commitment to fund exploratory drilling $ 10.6       $ 6,500
Exploration costs incurred 7.2 4,400      
Remaining commitment to fund exploratory drilling $ 3.5       $ 2,100
Exploration expense   $ 100      
Accrued expenses on exploratory drilling       $ 3,500  
Settlement amount for accrued expenses on exploratory drilling       $ 900