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DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details) - Commodity contracts | Sep. 30, 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) |  | 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
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
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 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,012,000 |
October 2018 - December 2018 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | (6.90) |
October 2018 - December 2018 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | (12.50) |
October 2018 - December 2018 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | (10.64) |
October 2018 - December 2018 | Basis Swap | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 1,380,000 |
October 2018 - December 2018 | Basis Swap | Natural gas | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.05) |
October 2018 - December 2018 | Basis Swap | Natural gas | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.19) |
October 2018 - December 2018 | Basis Swap | Natural gas | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | $ / MMBTU | (1.10) |
October 2018 - December 2018 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,196,000 | 92,000
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 | 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 |
October 2018 - December 2018 | Collars | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 55.80 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 63.00 |
October 2018 - December 2018 | Collars | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 50.08 | 50.65
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.87 | 55.65
October 2018 - December 2018 | Collars | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 690,000 |
October 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 |
October 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 |
October 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 |
October 2018 - December 2018 | Swaps | Natural gas liquids |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 92,000 |
October 2018 - December 2018 | Swaps | Natural gas liquids | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 32.50 |
October 2018 - December 2018 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 32.50 |
October 2018 - December 2018 | WTI NYMEX Roll | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 460,000 |
Basis Differential | 0.35 |
October 2018 - December 2018 | WTI NYMEX Roll | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | 0.35 |
October 2018 - December 2018 with weighted average price of $59.92 | Call option | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,196,000 |
October 2018 - December 2018 with weighted average price of $59.92 | Call option | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 59.00 |
October 2018 - December 2018 with weighted average price of $59.92 | Call option | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 63.00 |
October 2018 - December 2018 with weighted average price of $59.92 | Call option | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 59.92 |
October 2018 - December 2018 with weighted average price of $56.87 | Call option | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | (1,196,000) |
October 2018 - December 2018 with weighted average price of $56.87 | Call option | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 50.00 |
October 2018 - December 2018 with weighted average price of $56.87 | Call option | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 63.00 |
October 2018 - December 2018 with weighted average price of $56.87 | Call option | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Ceilings (in dollars per Mmbtu's/Bbl's) | 56.87 |
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 | 46.75
Ceilings (in dollars per Mmbtu's/Bbl's) | 51.75 | 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 - June 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 543,000 |
January 2019 - June 2019 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | (1.15) |
January 2019 - June 2019 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | (1.33) |
January 2019 - June 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | (1.22) |
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 | 2,365,000 | 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 | (3.73) | (1.02)
January 2019 - December 2019 | Basis Swap | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 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 | 5,110,000 | 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) | 55.00 | 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) | 53.12 | 50.24
Ceilings (in dollars per Mmbtu's/Bbl's) | 58.98 | 55.70
January 2019 - December 2019 | Collars | Natural gas |  |
Derivative and hedging activities |  |
Volume in Mmbtu's | MMBTU | 8,395,000 |
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) | $ / MMBTU | 3.00 |
January 2019 - December 2019 | Collars | Natural gas | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 2.65 |
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU | 3.03 |
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 Bbl's | bbl | 1,460,000 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Minimum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 29.08 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 30.15 |
January 2019 - December 2019 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 29.33 |
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 1,825,000 |
Basis Differential | 0.35 |
January 2019 - December 2019 | WTI NYMEX Roll | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | 0.35 |
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 | Collars | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 184,000 |
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) | 55.00 |
Ceilings (in dollars per Mmbtu's/Bbl's) | 69.00 |
October 2019 - December 2019 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 368,000 |
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 | 3.75 |
October 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | 3.65 |
October 2019 - December 2019 | Swaps | Natural gas liquids |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 92,000 |
October 2019 - December 2019 | Swaps | Natural gas liquids | Maximum |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 32.50 |
October 2019 - December 2019 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 32.50 |
January 2020 - December 2020 | Basis Swap | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 2,928,000 |
January 2020 - December 2020 | Basis Swap | Crude oil | Minimum |  |
Derivative and hedging activities |  |
Basis Differential | 2.00 |
January 2020 - December 2020 | Basis Swap | Crude oil | Maximum |  |
Derivative and hedging activities |  |
Basis Differential | 3.75 |
January 2020 - December 2020 | Basis Swap | Crude oil | Weighted Average |  |
Derivative and hedging activities |  |
Basis Differential | 2.82 |
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 | 1,464,000 |
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 | Swaps | Natural gas liquids |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 732,000 |
Floors (in dollars per Mmbtu's/Bbl's) | 31.00 |
January 2020 - December 2020 | Swaps | Natural gas liquids | Weighted Average |  |
Derivative and hedging activities |  |
Floors (in dollars per Mmbtu's/Bbl's) | 31.00 |
January 2020 - December 2020 | Put options | Crude oil |  |
Derivative and hedging activities |  |
Volume in Bbl's | bbl | 915,000 |
January 2020 - December 2020 | Put options | Crude oil | Maximum |  |
Derivative and hedging activities |  |
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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