Commitments and Contingencies Crude Oil Releases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Apr. 28, 2015 bbl	Apr. 30, 2014 bbl	Oct. 31, 2013 bbl	Mar. 31, 2013 bbl
Loss Contingencies [Line Items]
Environmental Remediation Expense		$ 1.0	$ 0.6
Haynesville Crude Oil Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released | bbl					400
Accrual for Environmental Loss Contingencies	$ 0.2
Environmental Remediation Expense		1.0	$ 0.3
Maximum Exposure for Environmental Remediation under Omnibus Agreement	1.0
Magnolia Station Spill [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released | bbl							5,900
Accrual for Environmental Loss Contingencies	1.0
Maximum Exposure for Environmental Remediation under Omnibus Agreement	0.3
Fouke Junction Crude Oil Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released | bbl				130
Accrual for Environmental Loss Contingencies	0.1
Macedonia Crude Oil Release [Member]
Loss Contingencies [Line Items]
Barrels of crude oil released | bbl						50
Maximum Exposure for Environmental Remediation under Omnibus Agreement	0.3
Operating Expense [Member] | Macedonia Crude Oil Release [Member]
Loss Contingencies [Line Items]
Cost incurred for environmental remediation	$ 0.0	$ 0.3