Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2014	Dec. 31, 2016
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 1,100		$ 1,100
Document Period End Date	Mar. 31, 2017
Environmental [Member]
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies	$ 1,100
Civil Penalty [Domain]
Loss Contingencies [Line Items]
Estimated Litigation Liability	1,400
Louisiana sales and use tax [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		$ 1,200
Litigation Settlement, Expense	100
Minimum [Member] | Environmental [Member]
Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost	900
Maximum [Member] | Environmental [Member]
Loss Contingencies [Line Items]
Environmental Exit Costs, Anticipated Cost	$ 1,300