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 9 Months Ended
Apr. 15, 2019
violation
Jan. 04, 2017
violation
Jul. 29, 2016
complaint
Feb. 09, 2016
complaint
Dec. 11, 2013
site
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
site
Sep. 30, 2018
USD ($)
Commitments [Line Items]                  
FOVs (in sites) 1 1     1     12  
Loss contingency accrual | $           $ 100   $ 100  
Judicial District Court for the Parish of Cameron                  
Commitments [Line Items]                  
Number of claims filed (in claims) | complaint       1          
Judicial District Court for the Parish of Vermillion                  
Commitments [Line Items]                  
Number of claims filed (in claims) | complaint     1            
Loss on long-term purchase commitment | Muskie Proppant LLC                  
Commitments [Line Items]                  
Non-utilization fees, accrued damages year to date | $           $ 20 $ 1,300 $ 400 $ 1,500