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DERIVATIVE AND HEDGING ACTIVITIES - Open contracts (Details) $ in Thousands	Jun. 30, 2018 USD ($) MMBTU $ / MMBTU $ / bbl bbl	Dec. 31, 2017 USD ($) MMBTU $ / MMBTU $ / bbl bbl
Derivative Assets
Gross Amounts Presented in the Consolidated Balance Sheet | $	$ 20,837	$ 677
Amounts Not Offset in the Consolidated Balance Sheet | $	(14,982)	(231)
Net Amount | $	5,855	446
Derivative Liabilities
Gross Amounts Presented in the Consolidated Balance Sheet | $	(74,486)	(26,999)
Amounts Not Offset in the Consolidated Balance Sheet | $	14,982	231
Net Amount | $	$ (59,504)	$ (26,768)
January 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		2,555,000
January 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		(1.05)
January 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		(1.50)
January 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		(1.29)
January 2018 - December 2018 | Collars | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		2,920,000
January 2018 - December 2018 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU		2,737,500
January 2018 - December 2018 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		275,000
Basis Differential		(1.15)
April 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		(1.15)
April 2018 - December 2018 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	1,472,000	1,012,000
July 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	(10.75)	(0.98)
July 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	(12.50)	(1.18)
July 2018 - December 2018 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	(11.69)	(1.12)
July 2018 - December 2018 | Basis Swap | Commodity contracts | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU	2,760,000
July 2018 - December 2018 | Basis Swap | Commodity contracts | Natural gas | Minimum
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.05)
July 2018 - December 2018 | Basis Swap | Commodity contracts | Natural gas | Maximum
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.19)
July 2018 - December 2018 | Basis Swap | Commodity contracts | Natural gas | Weighted Average
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.10)
July 2018 - December 2018 | Collars | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	1,840,000	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 | Commodity contracts | 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
July 2018 - December 2018 | Collars | Commodity contracts | 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
July 2018 - December 2018 | Collars | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	48.96	48.50
Ceilings (in dollars per Mmbtu's/Bbl's)	55.98	53.50
July 2018 - December 2018 | Collars | Commodity contracts | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU	1,380,000
July 2018 - December 2018 | Collars | Commodity contracts | 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
July 2018 - December 2018 | Collars | Commodity contracts | 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
July 2018 - December 2018 | Collars | Commodity contracts | 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 | Collars | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	276,000	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 | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	53.82	50.65
Ceilings (in dollars per Mmbtu's/Bbl's)	59.82	55.65
January 2019 - March 2019 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	2,172,000
January 2019 - June 2019 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	(0.98)
January 2019 - June 2019 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	(6.50)
January 2019 - June 2019 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	(3.02)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		4,380,000
January 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		(0.50)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		(1.33)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		(1.02)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU	9,307,500
January 2019 - December 2019 | Basis Swap | Commodity contracts | Natural gas | Minimum
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.05)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Natural gas | Maximum
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.40)
January 2019 - December 2019 | Basis Swap | Commodity contracts | Natural gas | Weighted Average
Derivative and hedging activities
Basis Differential | $ / MMBTU	(1.18)
January 2019 - December 2019 | Collars | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	5,110,000	1,825,000
January 2019 - December 2019 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Natural gas
Derivative and hedging activities
Volume in Mmbtu's | MMBTU	7,300,000
January 2019 - December 2019 | Collars | Commodity contracts | 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 | Commodity contracts | Natural gas | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU	2.62
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU	3.02
January 2019 - December 2019 | Collars | Commodity contracts | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU	2.59
Ceilings (in dollars per Mmbtu's/Bbl's) | $ / MMBTU	3.00
January 2019 - December 2019 | Swaps | Commodity contracts | Natural gas liquids
Derivative and hedging activities
Volume in Bbl's | bbl	912,500
January 2019 - December 2019 | Swaps | Commodity contracts | Natural gas liquids | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.08
January 2019 - December 2019 | Swaps | Commodity contracts | Natural gas liquids | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.10
January 2019 - December 2019 | Swaps | Commodity contracts | Natural gas liquids | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.09
April 2019 - December 2019 | Collars | Commodity contracts | 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 | Commodity contracts | 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 | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	736,000
July 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	(0.98)
July 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	(6.50)
July 2019 - December 2019 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	(3.95)
July 2019 - December 2019 | Collars | Commodity contracts | 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 | Commodity contracts | 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
January 2020 - December 2020 | Basis Swap | Commodity contracts | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	2,196,000
January 2020 - December 2020 | Basis Swap | Commodity contracts | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	2.00
January 2020 - December 2020 | Basis Swap | Commodity contracts | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	3.60
January 2020 - December 2020 | Basis Swap | Commodity contracts | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	2.56
January 2020 - December 2020 | Collars | Commodity contracts | 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 | Commodity contracts | 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

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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