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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($)
Commitments and contingencies |  |  |
Rent expense |  | $ 2,800 | $ 3,000
Approximate future minimum lease payments for all non-cancelable operating leases |  |  |
Remaining period in 2018 | $ 846 | 846 |
2019 | 2,990 | 2,990 |
2020 | 1,811 | 1,811 |
2021 | 1,497 | 1,497 |
2022 | 835 | 835 |
Thereafter | 1,345 | 1,345 |
Total | 9,324 | 9,324 |
Obligation under contractual commitments |  |  |
Remaining period in 2018 | 4,419 | 4,419 |
2019 | 4,726 | 4,726 |
Total | 9,145 | 9,145 |
Other contractual commitments for, among other things, stacking charges on certain drilling rig commitments |  |  |
Additional Fees may incur if certain requirements are not met by January 12, 2020 | 3,000 | 3,000 |
Drilling rig commitments |  |  |
Obligation under contractual commitments |  |  |
Non-cancelable termination penalties | 8,200 | 8,200 |
Drilling rig commitments | 9,100 | $ 9,100 |
Gathering, transportation and sales | West Texas |  |  |
Other contractual commitments for, among other things, stacking charges on certain drilling rig commitments |  |  |
Number of long-term crude oil sales contracts to which the entity is committed | item |  | 3 |
Number of long-term natural gas sales contracts to which the entity is committed | item |  | 11 |
Gathering, transportation and sales | West Texas | Minimum |  |  |
Other contractual commitments for, among other things, stacking charges on certain drilling rig commitments |  |  |
Period of commitment for production from the date of first production |  | 1 year |
Gathering, transportation and sales | West Texas | Maximum |  |  |
Other contractual commitments for, among other things, stacking charges on certain drilling rig commitments |  |  |
Period of commitment for production from the date of first production |  | 20 years |
Purchase agreement for natural gas treating equipment |  |  |
Other contractual commitments for, among other things, stacking charges on certain drilling rig commitments |  |  |
Purchase agreement amount | 13,300 |  |
Remaining commitment | $ 9,800 | $ 9,800 |

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