| DERIVATIVE INSTRUMENTS (Narrative) (Details) | Jun. 30, 2021  $ / MMBTU | 
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| NYMEX | |
| Derivative [Line Items] | |
| Weighted average price (in usd per MMBtu or Bbl) | 2.90 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Average fixed price related to the group of price risk swap derivatives. No definition available. 
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- Details 
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