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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) MMBTU in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) MMBTU | Apr. 15, 2019 violation | Jan. 04, 2017 violation | Dec. 11, 2013 | Apr. 30, 2020 | Oct. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) MMBTU | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) MMBTU complaint | Jun. 30, 2019 USD ($)
Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of claims filed (in claims) | complaint |  |  |  |  |  |  |  |  | 2 |
Loss contingency, damages sought | $ 28,000 |  |  |  |  |  |  |  |  |
Loss contingency, damages sought, percentages of unpaid overtime compensation |  |  |  |  | 6.00% |  |  |  |  |
FOVs (in sites) |  | 1 | 1 | 1 |  |  |  |  | 17 |
Loss contingency accrual | $ 1,700 |  |  |  |  |  | $ 1,700 |  | $ 1,700 |
Environmental cost |  |  |  |  |  | $ 180 |  |  |  |
Transportation commitment |  |  |  |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Firm transportation contracts, remainder of 2020 and 2021 | MMBTU | 1,455 |  |  |  |  |  | 1,455 |  | 1,455 |
Loss on long-term purchase commitment | Muskie Proppant LLC |  |  |  |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Non-utilization fees, accrued damages year to date |  |  |  |  |  |  | $ 1,900 | $ 300 | $ 3,800 | $ 300

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