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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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