Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Narrative) (Details)

v3.7.0.1
Derivative Instruments (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
MMBTU
$ / MMBTU
Jun. 30, 2017
$ / MMBTU
Derivative [Line Items]    
Derivative, extension option term   12 months
2018    
Derivative [Line Items]    
Daily Volume (in MMBtu) | MMBTU 30,000  
Weighted average price (in usd per MMBtu or Bbls) | $ / MMBTU 3.36 3.36
2018 | Short    
Derivative [Line Items]    
Daily Volume (in MMBtu) | MMBTU 30,000  
Weighted average price (in usd per MMBtu or Bbls) | $ / MMBTU 3.36 3.36