Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details)

v3.19.3.a.u2
DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details)
 9 Months Ended
Sep. 30, 2017
MMBTU
Sep. 30, 2019
MMBTU
$ / bbl
$ / MMBTU
bbl
NYMEX Henry Hub Swap - 2019    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   1,380,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   2.81
NYMEX Henry Hub Swap - 2019 | Short | Call Option    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   30,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   3.10
NYMEX Henry Hub Swap - 2020    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   519,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   2.88
NYMEX Henry Hub Swap - 2022 | Short | Call Option    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   628,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   2.90
NYMEX Henry Hub Swap - 2023 | Short | Call Option    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU 628,000  
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   2.90
NYMEX WTI Swap - 2019    
Derivative [Line Items]    
Daily Volume (Bbls/day) | bbl   6,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl   60.81
NYMEX WTI Swap - 2020    
Derivative [Line Items]    
Daily Volume (Bbls/day) | bbl   6,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl   59.82
Mont Belvieu C2 - 2019    
Derivative [Line Items]    
Daily Volume (Bbls/day) | bbl   1,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl   18.48
Mont Belvieu C3 Swap - 2019    
Derivative [Line Items]    
Daily Volume (Bbls/day) | bbl   4,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl   29.02
Mont Belvieu C5 Swap - 2019    
Derivative [Line Items]    
Daily Volume (Bbls/day) | bbl   1,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl   53.71
Transco Zone 4 - 2019 | Long    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   60,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   0.05
Transco Zone 4 - 2020 | Long    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   60,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   0.05
Fixed Spread - 2020 | Long    
Derivative [Line Items]    
Daily Volume (MMBtu/day) | MMBTU   10,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU   0.54