Quarterly report pursuant to Section 13 or 15(d)

COMMITTMENTS AND CONTINGENCIES (Narrative) (Details)

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COMMITTMENTS AND CONTINGENCIES (Narrative) (Details)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 29, 2016
complaint
defendant
Feb. 09, 2016
complaint
defendant
Mar. 11, 1997
Sep. 30, 2018
USD ($)
well
Jul. 29, 2016
complaint
Sep. 30, 2018
USD ($)
well
Sep. 30, 2017
USD ($)
Dec. 31, 1997
USD ($)
well
Commitments [Line Items]                
Plugging and abandonment trust on the WCBB properties       $ 3,100,000   $ 3,100,000    
Number of claims filed (in claims) | complaint         2      
Judicial District Court for the Parish of Cameron                
Commitments [Line Items]                
Number of claims filed (in claims) | complaint   1            
Number of defendants (in defendants) | defendant   26            
Judicial District Court for the Parish of Vermillion                
Commitments [Line Items]                
Number of claims filed (in claims) | complaint 1              
Number of defendants (in defendants) | defendant 40              
Purchase commitment                
Commitments [Line Items]                
Future minimum commitments       154,200,000   154,200,000    
Transportation commitment                
Commitments [Line Items]                
Firm transportation contracted with third parties       3,566,330,000   3,566,330,000    
Future minimum commitments       62,012,000   62,012,000    
Loss on long-term purchase commitment | Muskie Proppant LLC                
Commitments [Line Items]                
Non-utilization fees, accrued damages year to date       $ 1,300,000   $ 1,500,000 $ 0  
Minimum                
Commitments [Line Items]                
Operating lease, term (in years)       1 year   1 year    
WCBB                
Commitments [Line Items]                
Remaining interest in oil and gas property acquisition, percent               50.00%
Payments of seller's obligation to contribute               $ 18,000
Minimum number of wells to be plugged (in wells) | well               20
Tenure of minimum wells to be plugged (in years)     20 years          
Number of wells plugged (in wells) | well       555   555