Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Narrative (Details)

v3.6.0.2
Derivative Instruments - Narrative (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
MMBTU / d
$ / MMBTU
Dec. 31, 2014
USD ($)
Derivative [Line Items]      
Production delivered under fixed price swaps, percentage 77.00%    
January 2017 - December 2017      
Derivative [Line Items]      
Notional quantity (MMBtu/day) | MMBTU / d   30,000  
Weighted average price of derivative swap (usd per share) | $ / MMBTU   3.36  
January 2017 - December 2017 | Short      
Derivative [Line Items]      
Notional quantity (MMBtu/day) | MMBTU / d   30,000  
Weighted average price of derivative swap (usd per share) | $ / MMBTU   3.36  
Swap      
Derivative [Line Items]      
Cash flow hedges $ 0 $ 0 $ 0
Swaption      
Derivative [Line Items]      
Cash flow hedges 0 0 0
Basis swap      
Derivative [Line Items]      
Cash flow hedges $ 0 $ 0 $ 0