Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2016
defendant
Feb. 09, 2016
defendant
Mar. 11, 1997
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
well
Jul. 29, 2016
claim
Jun. 30, 2016
USD ($)
Dec. 31, 1997
USD ($)
well
Commitments [Line Items]                
Plugging and abandonment escrow account on the WCBB properties (Note 10)         $ 3,100      
Number of claims filed | claim           2    
Judicial District Court for the Parish of Cameron                
Commitments [Line Items]                
Number of defendants | defendant   26            
Judicial District Court for the Parish of Vermillion                
Commitments [Line Items]                
Number of defendants | defendant 40              
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         513      
Loss on long-term purchase commitment | Muskie Proppant LLC                
Commitments [Line Items]                
Long-term purchase commitment, accrued damages year to date       $ 700 $ 0   $ 2,000  
Minimum                
Commitments [Line Items]                
Operating lease, term         1 year