Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 631,947	$ 521,219
Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	137,473	129,109
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	467,575	369,601
Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	26,899	22,509
Offshore Pipeline Transportation [Member]
Disaggregation of Revenue [Line Items]
Total revenues	68,068	64,384
Offshore Pipeline Transportation [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	68,068	64,384
Offshore Pipeline Transportation [Member] | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Offshore Pipeline Transportation [Member] | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Sodium Minerals and Sulfur Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	285,674	227,287
Sodium Minerals and Sulfur Services [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Sodium Minerals and Sulfur Services [Member] | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	258,775	204,778
Sodium Minerals and Sulfur Services [Member] | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	26,899	22,509
Marine Transportation [Member]
Disaggregation of Revenue [Line Items]
Total revenues	55,774	40,331
Marine Transportation [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	55,774	40,331
Marine Transportation [Member] | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Marine Transportation [Member] | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Onshore Facilities and Transportation [Member]
Disaggregation of Revenue [Line Items]
Total revenues	222,431	189,217
Onshore Facilities and Transportation [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	13,631	24,394
Onshore Facilities and Transportation [Member] | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	208,800	164,823
Onshore Facilities and Transportation [Member] | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0