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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) MMBTU in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) MMBTU | Apr. 30, 2020 | Oct. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) MMBTU | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MMBTU complaint | Sep. 30, 2019 USD ($)
Commitments [Line Items] |  |  |  |  |  |  |
Number of claims filed (in claims) | complaint |  |  |  |  |  | 2 |
Loss contingency, damages sought, percentages of unpaid overtime compensation |  | 6.00% |  |  |  |  |
Environmental cost |  |  | $ 180 |  |  |  |
Muskie v. Company |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |
Loss contingency, damages sought | $ 2,500 |  |  |  |  |  |
Stingray Pressure Pumping LLC v. Gulfport Energy Corporation |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |
Loss contingency, damages sought | $ 37,000 |  |  |  |  |  |
Transportation Commitment |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |
Firm transportation contracts, remainder of 2020 (in mmbtu) | MMBTU | 1,380 |  |  | 1,380 |  | 1,380 |
Firm transportation contracts, due in 2021 (in mmbtu) | MMBTU | 1,399 |  |  | 1,399 |  | 1,399 |
Midship Pipeline LLC | Transportation Commitment |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |
Prepayment reservation charges |  |  |  |  |  | $ 32,900 |
Loss on Long-Term Purchase Commitment | Muskie Proppant LLC |  |  |  |  |  |  |
Commitments [Line Items] |  |  |  |  |  |  |
Non-utilization fees, accrued damages year to date |  |  |  | $ 1,900 | $ 20 | $ 5,600 | $ 400

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