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DERIVATIVE AND HEDGING ACTIVITIES - (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Derivative and hedging activities |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Predecessor | Successor
Asset derivative contracts |  | $ 5,219 | $ 51,551 |  | $ 51,551 |  | $ 5,219
Liability derivative contracts |  | $ (12,923) | (14,097) |  | $ (14,097) |  | (12,923)
Derivatives not designated as hedging contracts under ASC 815 |  |  |  |  |  |  |
Derivative and hedging activities |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor |  |  | Successor |  |
Asset derivative contracts |  | $ 5,219 | 51,551 |  | $ 51,551 |  | 5,219
Liability derivative contracts |  | (12,923) | (14,097) |  | (14,097) |  | (12,923)
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Current assets - receivables from derivative contracts |  |  |  |  |  |  |
Derivative and hedging activities |  |  |  |  |  |  |
Asset derivative contracts |  | 4,995 | 27,229 |  | 27,229 |  | 4,995
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Other noncurrent assets - receivables from derivative contracts |  |  |  |  |  |  |
Derivative and hedging activities |  |  |  |  |  |  |
Asset derivative contracts |  | 224 | 24,322 |  | 24,322 |  | 224
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Current liabilities - liabilities from derivative contracts |  |  |  |  |  |  |
Derivative and hedging activities |  |  |  |  |  |  |
Liability derivative contracts |  | (8,069) | (8,466) |  | (8,466) |  | (8,069)
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Other noncurrent liabilities - liabilities from derivative contracts |  |  |  |  |  |  |
Derivative and hedging activities |  |  |  |  |  |  |
Liability derivative contracts |  | $ (4,854) | $ (5,631) |  | $ (5,631) |  | $ (4,854)

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