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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 09, 2016 USD ($)	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Commitments and contingencies
Rent expense		$ 1,400	$ 5,900	$ 3,700	$ 3,900
Approximate future minimum lease payments for all non-cancelable operating leases
2018				3,792
2019				2,350
2020				1,899
2021				968
2022				999
Thereafter				599
Total				10,607
Obligations under rig termination and stacking fees commitments
2019				781
2020				3,000
Total				3,781
Purchase commitments related to equipment
2019				20,233
Total				20,233
Drilling rig commitments
Obligation under contractual commitments
2018				4,973
Total				4,973
Non-cancelable termination penalties				4,700
Drilling rig commitments				$ 5,000
Gathering, transportation and sales | West Texas
Purchase commitments related to equipment
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				10
Gathering, transportation and sales | West Texas | Minimum
Purchase commitments related to equipment
Period of commitment for production from the date of first production				1 year
Gathering, transportation and sales | West Texas | Maximum
Purchase commitments related to equipment
Period of commitment for production from the date of first production				20 years
Reorganization Adjustments
Commitments and contingencies
Payments for amended certain office lease arrangements	$ 3,400

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