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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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