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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($)
Commitments and contingencies |  |
Rent expense | $ 1,900 | $ 2,000
Approximate future minimum lease payments for all non-cancelable operating leases |  |
Remaining period in 2018 | 1,678 |
2019 | 2,990 |
2020 | 1,811 |
2021 | 1,497 |
2022 | 835 |
Thereafter | 1,345 |
Total | 10,156 |
Obligation under contractual commitments |  |
Remaining period in 2018 | 6,949 |
2019 | 2,850 |
Total | 9,799 |
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 |
Drilling rig commitments |  |
Obligation under contractual commitments |  |
Non-cancelable termination penalties | 8,700 |
Drilling rig commitments | $ 9,800 |
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 | 2 |
Number of long-term natural gas sales contracts to which the entity is committed | item | 10 |
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 |

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