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Commitments and Contingencies Crude Oil Releases (Details) $ in Millions	Dec. 31, 2016 USD ($)	Jan. 31, 2016 bbl	Apr. 28, 2015 bbl	Apr. 30, 2014 bbl	Mar. 31, 2013 bbl
Haynesville Crude Oil Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released				400
Magnolia Station Spill [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released					5,900
Accrual for Environmental Loss Contingencies | $	$ 1.0
Fouke Junction Crude Oil Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released			130
Modisette Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released		30
Paline Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released		350
Accrual for Environmental Loss Contingencies | $	$ 0.1

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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.

+ 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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