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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Assets
Asset transfers between levels	$ 0
Liabilities
Liability transfers between levels		$ 0
Recurring | Total
Assets
Receivables from derivative contracts	69,717	677
Liabilities
Liabilities from derivative contracts	12,907	26,999
Recurring | Level 2
Assets
Receivables from derivative contracts	69,717	677
Liabilities
Liabilities from derivative contracts	$ 12,907	$ 26,999

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