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FINANCIAL STATEMENT PRESENTATION - Related Party Transactions (Details) - USD ($) $ in Millions			3 Months Ended
	Jul. 27, 2018	Nov. 16, 2017	Mar. 31, 2019
Chairman, Chief Executive Officer and President
Related Party Transactions
Amount incurred			$ 0.2
SCM Crude, LLC
Related Party Transactions
Term	15 years
Amount earned			39.2
Receivable from related party			11.2
Minimum percentage of funds controlled by related party	10.00%
Salt Creek Midstream, LLC
Related Party Transactions
Term		15 years
Amount earned			0.2
Receivable from related party			0.8
Minimum percentage of funds controlled by related party		10.00%
Cima
Related Party Transactions
Amount incurred			0.3
Cima | Accounts payable and accrued liabilities
Related Party Transactions
Amount payable			$ 0.2

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