COMMITMENTS AND CONTINGENCIES - Narrative (Details) - Maximum - Meadowlark Midstream Gathering System - Principal Owner	9 Months Ended
Sep. 30, 2020 USD ($)
Loss Contingencies [Line Items]
Coverage from pollution liability insurance policy	$ 25,000,000.0
Coverage from property and business interruption insurance policy	$ 200,000,000.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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