Annual report pursuant to Section 13 and 15(d)

Commitments - Narrative (Details)

v3.6.0.2
Commitments - Narrative (Details)
MMBTU / d in Thousands, $ in Thousands
 12 Months Ended
Nov. 02, 2016
shares
Mar. 13, 2015
Apr. 22, 2014
Nov. 01, 2012
Mar. 11, 1997
USD ($)
well
Dec. 31, 2016
USD ($)
MMBTU / d
well
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments [Line Items]                
Plugging and abandonment escrow account on the WCBB properties (Note 15)           $ 3,100    
Maximum annual contributions per employee (401K Plan)           100.00%    
Cost recognized on defined contribution plan           $ 1,700 $ 1,400 $ 800
Purchase commitment daily volume | MMBTU / d           1,379    
Chief Executive Officer                
Commitments [Line Items]                
Employment agreement term     3 years          
Chief Operating Officer                
Commitments [Line Items]                
Employment agreement term   2 years            
Post employment benefits, eligibility term 18 months              
Chief Financial Officer                
Commitments [Line Items]                
Employment agreement term   3 years            
Management                
Commitments [Line Items]                
Employment agreement term       3 years        
Period of employment automatic extension       1 year        
Employment agreement, notice period allowed for termination       90 days        
Minimum                
Commitments [Line Items]                
Minimum matching employer contribution for 401K           3.00%    
Operating lease term (exceeding one year)           1 year    
WCBB                
Commitments [Line Items]                
Remaining percent interest in properties         50.00%      
Monthly payments to abandonment trust obligation         $ 18      
Plugging commitment, minimum number of wells to be plugged | well         20      
Period of well plugging commitment         20 years      
Number of wells plugged to date | well           513    
Restricted stock | Chief Operating Officer                
Commitments [Line Items]                
Annual employee compensation commitment, shares awarded (shares) | shares 3,000              
Restricted Stock Units (RSUs) | Chief Operating Officer                
Commitments [Line Items]                
Annual employee compensation commitment, shares awarded (shares) | shares 14,820              
Salary commitment under employment agreements | Management                
Commitments [Line Items]                
Other liabilities           $ 400    
Transportation commitment                
Commitments [Line Items]                
Other liabilities           $ 3,820,181