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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Assets
Asset transfers between levels	$ 0	$ 0
Liabilities
Liability transfers between levels	0	0
Recurring | Total
Assets
Receivables from derivative contracts	20,837	677
Liabilities
Liabilities from derivative contracts	74,486	26,999
Recurring | Level 2
Assets
Receivables from derivative contracts	20,837	677
Liabilities
Liabilities from derivative contracts	$ 74,486	$ 26,999

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