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DERIVATIVE AND HEDGING ACTIVITIES - Number of Contracts (Details) - Derivatives not designated as hedging contracts - Commodity contracts - item | Sep. 30, 2018 | Dec. 31, 2017
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Derivative and hedging activities |  |
Number of open commodity derivative contracts | 85 | 34
Collars | Natural gas |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 8 | 3
Collars | Crude oil |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 31 | 19
Basis Swap | Natural gas |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 7 |
Basis Swap | Natural gas liquids |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 8 |
Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 25 | 12
Put options | Crude oil |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 2 |
Call option | Crude oil |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 3 |
WTI NYMEX Roll | Crude oil |  |
Derivative and hedging activities |  |
Number of open commodity derivative contracts | 1 |

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