DERIVATIVE INSTRUMENTS (Narrative) (Details) - 2019	9 Months Ended
Sep. 30, 2018 MMBTU $ / MMBTU
Derivative [Line Items]
Daily volume (in MMBtu) \| MMBTU	100,000
Weighted average price (in usd per MMBtu or Bbl) \| $ / MMBTU	3.05

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration