Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Narrative) (Details)

v3.5.0.2
Derivative Instruments (Narrative) (Details)
6 Months Ended
Jun. 30, 2016
MMBTU / d
$ / MMBTU
Derivative [Line Items]  
Derivative, Extension Option Term 12 months
January 2017 - December 2017  
Derivative [Line Items]  
Daily Volume | MMBTU / d 30,000
Weighted Average Price (in usd per MMBtu) | $ / MMBTU 3.33
January 2017 - December 2017 | Short  
Derivative [Line Items]  
Daily Volume | MMBTU / d 30,000
Weighted Average Price (in usd per MMBtu) | $ / MMBTU 3.33