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FINANCIAL STATEMENT PRESENTATION - Related Party Transaction (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Jul. 27, 2018	Nov. 16, 2017	Sep. 30, 2018	Sep. 30, 2018
Chairman, Chief Executive Officer and President
Related Party Transaction
Amount paid for charter of aircraft			$ 0.2	$ 0.8
Chairman, Chief Executive Officer and President | Accounts payable and accrued liabilities
Related Party Transaction
Amount payable			0.1	0.1
Salt Creek Midstream, LLC
Related Party Transaction
Term		15 years
Amount received			$ 0.0	$ 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%

X

- Definition

Period of gas purchase and processing agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-03.1(e))
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