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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