Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

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DERIVATIVE INSTRUMENTS (Narrative) (Details)
$ in Millions
1 Months Ended 9 Months Ended
Dec. 31, 2018
MMBTU
$ / MMBTU
Sep. 30, 2019
USD ($)
Derivative [Line Items]    
Fair value of contingent consideration asset on date of divestiture | $   $ 1.1
2019    
Derivative [Line Items]    
Counterparty option to extend the original terms, number of months   12 months
Daily volume (in MMBtu) | MMBTU 100,000  
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU 3.05