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COMMITTMENTS AND CONTINGENCIES (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 6 Months Ended
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Apr. 15, 2019 violation | Jan. 04, 2017 violation | Jul. 29, 2016 complaint | Feb. 09, 2016 complaint | Dec. 11, 2013 site | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) site | Jun. 30, 2018 USD ($)
Commitments [Line Items] |  |  |  |  |  |  |  |  |
FOVs (in sites) | 1 | 1 |  |  | 1 |  |  | 12 |
Loss contingency accrual | $ |  |  |  |  |  | $ 100,000 |  | $ 100,000 |
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 | $ |  |  |  |  |  | $ 0 | $ 0 | $ 300,000 | $ 900,000

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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
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