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FINANCIAL STATEMENT PRESENTATION - Related Party Transaction (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
	Jul. 27, 2018	Nov. 16, 2017	Jun. 30, 2018	Jun. 30, 2018
Chairman, Chief Executive Officer and President
Related Party Transaction
Amount paid for charter of aircraft			$ 0.1	$ 0.6
Amount payable			0.2	0.2
Salt Creek Midstream, LLC
Related Party Transaction
Term		15 years
Receivable from related party			0.3	0.3
Amount received			$ 0.4	$ 0.4
Minimum percentage of funds controlled by related party		10.00%
SCM Crude, LLC
Related Party Transaction
Term	15 years
Minimum percentage of funds controlled by related party	10.00%

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Amounts due to recorded owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company.

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