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DERIVATIVE AND HEDGING ACTIVITIES (Details) $ in Thousands	Jun. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($) item
Derivative and hedging activities
Asset derivative contracts	$ 20,837	$ 677
Liability derivative contracts	(74,486)	(26,999)
Derivatives not designated as hedging contracts
Derivative and hedging activities
Asset derivative contracts	20,837	677
Liability derivative contracts	$ (74,486)	$ (26,999)
Derivatives not designated as hedging contracts | Commodity contracts
Derivative and hedging activities
Number of open commodity derivative contracts | item	66	34
Derivatives not designated as hedging contracts | Commodity contracts | Current assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	$ 19,391	$ 677
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent assets - receivables from derivative contracts
Derivative and hedging activities
Asset derivative contracts	1,446
Derivatives not designated as hedging contracts | Commodity contracts | Current liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	(53,513)	(19,248)
Derivatives not designated as hedging contracts | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts
Derivative and hedging activities
Liability derivative contracts	$ (20,973)	$ (7,751)
Derivatives not designated as hedging contracts | Commodity contracts | Collars | Natural gas
Derivative and hedging activities
Number of open commodity derivative contracts | item	7	3
Derivatives not designated as hedging contracts | Commodity contracts | Collars | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts | item	31	19
Derivatives not designated as hedging contracts | Commodity contracts | Basis Swap | Natural gas
Derivative and hedging activities
Number of open commodity derivative contracts | item	7
Derivatives not designated as hedging contracts | Commodity contracts | Basis Swap | Natural gas liquids
Derivative and hedging activities
Number of open commodity derivative contracts | item	3
Derivatives not designated as hedging contracts | Commodity contracts | Basis Swap | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts | item	18	12

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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