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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Feb. 28, 2018 bbl	Mar. 31, 2013 bbl
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease)	$ 0.1
Accrual for environmental loss contingencies, expected reimbursements	6.1
SALA Gathering System February 2018 Release - First
Loss Contingencies [Line Items]
Crude oil released (in barrels) | bbl		203
Magnolia Release
Loss Contingencies [Line Items]
Crude oil released (in barrels) | bbl			5,900
Magnolia Release | Other Current Liabilities [Member] | Magnolia Release
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 1.0

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Accrual for Environmental Loss Contingencies, Expected Reimbursements

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Barrels of crude oil released

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Increase (decrease) in the accrual for environmental loss contingencies during the reporting period.

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