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DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details) - Commodity contracts | Dec. 31, 2018 MMBTU $ / MMBTU $ / bbl bbl | Dec. 31, 2017 MMBTU $ / MMBTU $ / bbl bbl
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January 2018 - December 2018 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 2,555,000
January 2018 - December 2018 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.05)
January 2018 - December 2018 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.50)
January 2018 - December 2018 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.29)
January 2018 - December 2018 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 2,920,000
January 2018 - December 2018 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 45.00
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 50.00
January 2018 - December 2018 | Collars | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 53.00
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 60.00
January 2018 - December 2018 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 49.29
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 56.82
January 2018 - December 2018 | Collars | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU |  | 2,737,500
January 2018 - December 2018 | Collars | Natural gas | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.00
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.22
January 2018 - December 2018 | Collars | Natural gas | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.03
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.38
January 2018 - December 2018 | Collars | Natural gas | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.01
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU |  | 3.30
April 2018 - December 2018 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 275,000
Basis Differential |  | (1.15)
April 2018 - December 2018 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.15)
April 2018 - December 2018 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 275,000
April 2018 - December 2018 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 46.75
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 51.75
April 2018 - December 2018 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 46.75
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 51.75
July 2018 - December 2018 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 1,012,000
July 2018 - December 2018 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential |  | (0.98)
July 2018 - December 2018 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.18)
July 2018 - December 2018 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential |  | (1.12)
July 2018 - December 2018 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 184,000
July 2018 - December 2018 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 48.50
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 53.50
July 2018 - December 2018 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 48.50
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 53.50
October 2018 - December 2018 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl |  | 92,000
October 2018 - December 2018 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 50.65
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 55.65
October 2018 - December 2018 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 50.65
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 55.65
January 2019 - March 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 90,000 | 90,000
Floors (in dollars per Mmbtu's/Bbl's) | 46.75 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 51.75 |
January 2019 - March 2019 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) |  | 46.75
Ceilings (in dollars per Mmbtu's/Bbl's) |  | 51.75
January 2019 - March 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 46.75 | 46.75
Ceilings (in dollars per Mmbtu's/Bbl's) | 51.75 | 51.75
January 2019 - March 2019 | Call option | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,350,000 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 62.64 |
January 2019 - March 2019 | Call option | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 62.64 |
January 2019 - March 2019 | Call option | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | (1,350,000) |
Ceilings (in dollars per Mmbtu's/Bbl's) | 58.64 |
January 2019 - March 2019 | Call option | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 58.64 |
January 2019 - June 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 181,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 51.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.00 |
January 2019 - June 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 51.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.00 |
January 2019 - September 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 546,000 |
January 2019 - September 2019 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | (6.20) |
January 2019 - September 2019 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | (7.60) |
January 2019 - September 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | (6.90) |
January 2019 - December 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 2,448,000 | 4,380,000
January 2019 - December 2019 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | (0.98) | (0.50)
January 2019 - December 2019 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | (6.50) | (1.33)
January 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | (2.80) | (1.02)
January 2019 - December 2019 | Basis Swap | Natural gas |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 9,307,500 |
January 2019 - December 2019 | Basis Swap | Natural gas | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.05) |
January 2019 - December 2019 | Basis Swap | Natural gas | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.40) |
January 2019 - December 2019 | Basis Swap | Natural gas | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.18) |
January 2019 - December 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 3,650,000 | 1,825,000
January 2019 - December 2019 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 | 50.00
Ceilings (in dollars per Mmbtu's/Bbl's) | 55.20 | 55.00
January 2019 - December 2019 | Collars | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 58.00 | 51.00
Ceilings (in dollars per Mmbtu's/Bbl's) | 63.00 | 57.30
January 2019 - December 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 53.87 | 50.24
Ceilings (in dollars per Mmbtu's/Bbl's) | 60.07 | 55.70
January 2019 - December 2019 | Collars | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 8,760,000 |
January 2019 - December 2019 | Collars | Natural gas | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 2.52 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 3.00 |
January 2019 - December 2019 | Collars | Natural gas | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 2.70 |
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 3.10 |
January 2019 - December 2019 | Collars | Natural gas | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 2.60 |
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 3.01 |
January 2019 - December 2019 | Swaps | Natural gas liquids |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 1,460,000 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 29.08 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 30.15 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 29.33 |
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,825,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 0.35 |
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 0.35 |
April 2019 - June 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 91,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 55.00 |
April 2019 - June 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 55.00 |
April 2019 - December 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 275,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 55.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 62.85 |
April 2019 - December 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 55.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 62.85 |
July 2019 - December 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 460,000 |
July 2019 - December 2019 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | (2.40) |
July 2019 - December 2019 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | (6.50) |
July 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | (5.68) |
July 2019 - December 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 552,000 |
July 2019 - December 2019 | Collars | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 55.00 |
July 2019 - December 2019 | Collars | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 55.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 69.00 |
July 2019 - December 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 53.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 61.00 |
October 2019 - December 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 460,000 |
October 2019 - December 2019 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | 3.45 |
October 2019 - December 2019 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | 4.00 |
October 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | 3.72 |
October 2019 - December 2019 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 92,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 51.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.00 |
October 2019 - December 2019 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 51.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.00 |
October 2019 - December 2019 | Swaps | Natural gas liquids |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 92,000 |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 32.50 |
October 2019 - December 2019 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 32.50 |
January 2020 - December 2020 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 3,294,000 |
January 2020 - December 2020 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 2.00 |
January 2020 - December 2020 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 4.00 |
January 2020 - December 2020 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 2.95 |
January 2020 - December 2020 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 549,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 70.00 |
January 2020 - December 2020 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 50.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 70.00 |
January 2020 - December 2020 | Call option | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 2,342,400 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 70.00 |
January 2020 - December 2020 | Call option | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 70.00 |
January 2020 - December 2020 | Put options | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 915,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 55.00 |
January 2020 - December 2020 | Put options | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 55.00 |

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