Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details)

v3.10.0.1
DERIVATIVE INSTRUMENTS (Schedule of Derivative Instruments) (Details)
 9 Months Ended
Sep. 30, 2018
MMBTU
$ / bbl
$ / MMBTU
bbl
NYMEX Henry Hub Swap - 2018  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 1,010,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU 3.01
NYMEX Henry Hub Swap - 2018 | Short | Call Option  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 50,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU 3.13
NYMEX Henry Hub Swap - 2019  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 1,154,000
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 204,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU 2.77
ARGUS LLS Swap - 2018  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 2,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 56.22
ARGUS LLS Swap - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 1,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 59.55
NYMEX WTI Swap - 2018  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 4,500
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 53.72
NYMEX WTI Swap - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 4,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 58.28
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 - 2018  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 4,000
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 29.34
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 28.87
Mont Belvieu C5 Swap - 2018  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 500
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 46.62
Mont Belvieu C5 Swap - 2019  
Derivative [Line Items]  
Daily Volume (Bbls/day) | bbl 500
Weighted average price (in usd per MMBtu or Bbl) | $ / bbl 54.08
Transco Zone 4 - 2018 | Long  
Derivative [Line Items]  
Daily Volume (MMBtu/day) | MMBTU 40,000
Weighted average price (in usd per MMBtu or Bbl) | $ / MMBTU 0.05
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