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Commitments and Contingencies Crude Oil Releases (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Jan. 31, 2016 bbl	Mar. 31, 2013 bbl
Modisette Release [Member]
Loss Contingencies [Line Items]
Remediation costs incurred	$ 0.3
Crude oil released (barrels) | bbl			30
Paline Release [Member]
Loss Contingencies [Line Items]
Remediation costs incurred	0.6
Accrual for Environmental Loss Contingencies	0.2
Crude oil released (barrels) | bbl			350
Magnolia Station Spill [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	1.0
Crude oil released (barrels) | bbl				5,900
Operating Expense [Member]
Loss Contingencies [Line Items]
Remediation costs incurred	$ 0.9	$ 0.1

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- Definition

Barrels of crude oil released

+ References

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- Definition

Cost incurred during the period to clean up and remediate site.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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