Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 09, 2016
complaint
company
Mar. 11, 1997
Jun. 30, 2016
USD ($)
well
Jun. 30, 2016
USD ($)
well
Dec. 31, 1997
USD ($)
well
Dec. 31, 2015
USD ($)
Commitments [Line Items]            
Loss Contingency, New Claims Filed, Number | complaint 2          
Plugging and abandonment escrow account on the WCBB properties (Note 10)     $ 3,081 $ 3,081   $ 3,089
WCBB            
Commitments [Line Items]            
Purchasing remaining percent interest In oil and gas property, percent         50.00%  
Payments held for restricted cash         $ 18  
Significant plugging commitment minimum number of wells to be plugged | well         20  
Tenure of minimum wells to be plugged   20 years        
Number of wells plugged | well     463 463    
Muskie Proppant LLC            
Commitments [Line Items]            
Long-term purchase commitment, accrued damages , amount     $ 700 $ 2,000    
Cameron Parish            
Commitments [Line Items]            
Loss Contingency, Number of Defendant Companies in a Complaint | company 26          
Vermillion Parish            
Commitments [Line Items]            
Loss Contingency, Number of Defendant Companies in a Complaint | company 9