Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.20.2
DERIVATIVE INSTRUMENTS (Narrative) (Details)
MMBTU in Thousands, $ in Thousands
 1 Months Ended 9 Months Ended
Nov. 06, 2020
USD ($)
MMBTU
$ / MMBTU
Oct. 30, 2020
USD ($)
MMBTU
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Derivative [Line Items]        
Net cash receipts on settled derivative instruments | $     $ 225,364 $ 80,744
Subsequent Event        
Derivative [Line Items]        
Daily volume (in MMBtu) | MMBTU 475      
Net cash receipts on settled derivative instruments | $ $ 60,200 $ 200    
Strike price | $ / MMBTU 2.90      
2020 | Subsequent Event        
Derivative [Line Items]        
Daily volume (in MMBtu) | MMBTU   40