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SUMMARY OF SIGNIFICANT EVENTS AND ACCOUNTING POLICIES - Related Party Transactions (Details) - USD ($) $ in Millions			12 Months Ended
	Jul. 27, 2018	Nov. 16, 2017	Dec. 31, 2018
Chairman, Chief Executive Officer and President
Related Party Transactions
Amount paid for charter of aircraft			$ 0.9
Chairman, Chief Executive Officer and President | Accounts payable and accrued liabilities
Related Party Transactions
Amount payable			0.2
Ares Management LLC | Halcon Resources Corporation
Related Party Transactions
Ownership interest (as a percent)	10.00%	10.00%
Salt Creek Midstream, LLC
Related Party Transactions
Term		15 years
Amount received			0.4
SCM Crude, LLC
Related Party Transactions
Term	15 years
Amount received			13.0
Receivable from related party			$ 10.9

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