Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Narrative (Details)

v3.8.0.1
Derivative Instruments - Narrative (Details)
12 Months Ended
Dec. 31, 2017
MMBTU
$ / MMBTU
Derivative [Line Items]  
Derivative, extension option term 12 months
Production delivered under fixed price swaps, percentage 68.00%
Fixed Price Swap 2019  
Derivative [Line Items]  
Daily volume (MMBtu/day) | MMBTU 100,000
Weighted average price of derivative swap (usd per MMBtu or Bbls) | $ / MMBTU 3.05