Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Total revenues		$ 797,963	$ 1,018,878	$ 882,431
Throughput and storage
Disaggregation of Revenue
Total revenues	[1]	86,514	80,193	75,223
Sulfur services
Disaggregation of Revenue
Total revenues		13,430	12,337	11,799
Terminalling and storage segment
Disaggregation of Revenue
Total revenues		86,514	80,193	75,223
Terminalling and storage segment | Throughput and storage
Disaggregation of Revenue
Total revenues		86,514	80,193	75,223
Transportation segment
Disaggregation of Revenue
Total revenues		223,677	219,008	144,314
Transportation segment | Land transportation
Disaggregation of Revenue
Total revenues		166,717	166,631	111,611
Transportation segment | Inland transportation
Disaggregation of Revenue
Total revenues		50,890	45,050	29,536
Transportation segment | Offshore transportation
Disaggregation of Revenue
Total revenues		6,070	7,327	3,167
Sulfur service segment
Disaggregation of Revenue
Total revenues		140,995	179,164	145,042
Sulfur service segment | Sulfur product sales
Disaggregation of Revenue
Total revenues		30,170	42,247	32,416
Sulfur service segment | Fertilizer product sales
Disaggregation of Revenue
Total revenues		97,395	124,580	100,827
Sulfur service segment | Sulfur services
Disaggregation of Revenue
Total revenues		13,430	12,337	11,799
Specialty products segment
Disaggregation of Revenue
Total revenues		346,777	540,513	517,852
Specialty products segment | Natural gas liquids product sales
Disaggregation of Revenue
Total revenues		214,713	398,422	414,046
Specialty products segment | Lubricant product sales
Disaggregation of Revenue
Total revenues		$ 132,064	$ 142,091	$ 103,806

[1] Related Party Transactions Included Above Year Ended December 31, 202320222021Revenues:   Terminalling and storage$72,138 $66,867 $62,677 Transportation29,276 28,393 20,046 Product sales8,767 554 479 Costs and expenses:   Cost of products sold: (excluding depreciation and amortization)   Specialty products35,930 39,356 27,856 Sulfur services11,182 10,717 9,980           Terminalling and storage75 19 10 Expenses:   Operating expenses100,851 93,630 78,607 Selling, general and administrative32,021 31,758 32,924