Major Customers and Concentration Of Risks (Details)	12 Months Ended
	Dec. 31, 2017 Employee
Concentration Risk [Line Items]
Number of employees	1,802
Refined Products Segment [Member]
Concentration Risk [Line Items]
Number of employees	940
Crude Oil Pipeline and Terminals Segment [Member]
Concentration Risk [Line Items]
Number of employees	151
Marine Storage Segment [Member]
Concentration Risk [Line Items]
Number of employees	177
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Customer Concentration Risk, Benchmark Percentage	10.00%
Unionized Employees Concentration Risk [Member] | Refined Products Segment [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	24.00%
Unionized Employees Concentration Risk [Member] | Crude Oil Pipeline and Terminals Segment [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	0.00%
Unionized Employees Concentration Risk [Member] | Marine Storage Segment [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	16.00%