Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 745,278	$ 2,223,474
Transferred over time | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	168,599	482,290
Transferred over time | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	23,515	75,190
Transferred at point in time | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	553,164	1,665,994
Onshore facilities and transportation
Disaggregation of Revenue [Line Items]
Total revenues	327,145	972,207
Onshore facilities and transportation | Transferred over time | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	42,188	107,536
Onshore facilities and transportation | Transferred over time | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Onshore facilities and transportation | Transferred at point in time | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	284,957	864,671
Sodium Minerals & Sulfur Services
Disaggregation of Revenue [Line Items]
Total revenues	291,722	876,513
Sodium Minerals & Sulfur Services | Transferred over time | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Sodium Minerals & Sulfur Services | Transferred over time | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	23,515	75,190
Sodium Minerals & Sulfur Services | Transferred at point in time | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	268,207	801,323
Offshore Pipeline Transportation
Disaggregation of Revenue [Line Items]
Total revenues	70,115	213,344
Offshore Pipeline Transportation | Transferred over time | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	70,115	213,344
Offshore Pipeline Transportation | Transferred over time | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Offshore Pipeline Transportation | Transferred at point in time | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Marine Transportation
Disaggregation of Revenue [Line Items]
Total revenues	56,296	161,410
Marine Transportation | Transferred over time | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	56,296	161,410
Marine Transportation | Transferred over time | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Marine Transportation | Transferred at point in time | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0