Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 770,105	$ 790,612
Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	200,857	188,805
Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	546,361	579,983
Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	22,887	21,824
Offshore Pipeline Transportation [Member]
Disaggregation of Revenue [Line Items]
Total revenues	101,990	91,395
Offshore Pipeline Transportation [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	101,990	91,395
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
Soda and sulfur services
Disaggregation of Revenue [Line Items]
Total revenues	400,948	444,648
Soda and sulfur services | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Soda and sulfur services | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	378,061	422,824
Soda and sulfur services | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	22,887	21,824
Marine Transportation [Member]
Disaggregation of Revenue [Line Items]
Total revenues	83,574	83,226
Marine Transportation [Member] | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	83,574	83,226
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
Disaggregation of Revenue [Line Items]
Total revenues	183,593	171,343
Onshore facilities and transportation | Fee-based Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	15,293	14,184
Onshore facilities and transportation | Product Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	168,300	157,159
Onshore facilities and transportation | Refinery Services [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0