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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Assets
Asset transfers between levels	$ 0
Liabilities
Liability transfers between levels	0
Recurring | Total
Assets
Receivables from derivative contracts	15,468	$ 69,717
Liabilities
Liabilities from derivative contracts	16,062	12,907
Recurring | Level 2
Assets
Receivables from derivative contracts	15,468	69,717
Liabilities
Liabilities from derivative contracts	$ 16,062	$ 12,907

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