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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative and hedging activities
Total net gain (loss) on derivative contracts	$ 17,010	$ (12,100)	$ (47,789)	$ (6,197)
Derivatives not designated as hedging contracts | Commodity contracts | Other Income Expense
Derivative and hedging activities
Unrealized gain (loss) on commodity contracts	10,764	(37,874)	(57,405)	(26,761)
Realized gain (loss) on commodity contracts	6,246	25,774	9,616	20,564
Total net gain (loss) on derivative contracts	$ 17,010	$ (12,100)	$ (47,789)	$ (6,197)

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Gain (loss) incurred in hedging activities.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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