Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 621,697	$ 745,278	$ 1,876,491	$ 2,223,474
Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	176,079	168,599	523,955	482,290
Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	427,423	553,164	1,294,181	1,665,994
Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	18,195	23,515	58,355	75,190
Onshore Facilities & Transportation
Disaggregation of Revenue [Line Items]
Total revenues	205,028	327,145	637,630	972,207
Onshore Facilities & Transportation | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	36,937	42,188	112,713	107,536
Onshore Facilities & Transportation | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	168,091	284,957	524,917	864,671
Onshore Facilities & Transportation | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Sodium Minerals & Sulfur Services
Disaggregation of Revenue [Line Items]
Total revenues	277,527	291,722	827,619	876,513
Sodium Minerals & Sulfur Services | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Sodium Minerals & Sulfur Services | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	259,332	268,207	769,264	801,323
Sodium Minerals & Sulfur Services | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	18,195	23,515	58,355	75,190
Offshore Pipeline Transportation
Disaggregation of Revenue [Line Items]
Total revenues	79,738	70,115	236,482	213,344
Offshore Pipeline Transportation | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	79,738	70,115	236,482	213,344
Offshore Pipeline Transportation | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Offshore Pipeline Transportation | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Marine Transportation
Disaggregation of Revenue [Line Items]
Total revenues	59,404	56,296	174,760	161,410
Marine Transportation | Fee-based revenues
Disaggregation of Revenue [Line Items]
Total revenues	59,404	56,296	174,760	161,410
Marine Transportation | Product Sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Marine Transportation | Refinery Services
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0	$ 0