Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Narrative) (Details)

v3.8.0.1
Derivative Instruments (Narrative) (Details) - 2019
3 Months Ended
Mar. 31, 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