Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue
Total revenues		$ 882,431	$ 672,142	$ 847,118
Lubricant product sales
Disaggregation of Revenue
Total revenues	[1]	103,809	103,300	122,257
Throughput and storage
Disaggregation of Revenue
Total revenues	[1]	75,223	80,864	87,397
Sulfur services
Disaggregation of Revenue
Total revenues		11,799	11,659	11,434
Natural gas liquids product sales
Disaggregation of Revenue
Total revenues	[1]	414,043	247,479	366,502
Terminalling and storage segment
Disaggregation of Revenue
Total revenues		179,032	184,164	209,654
Terminalling and storage segment | Lubricant product sales
Disaggregation of Revenue
Total revenues		103,809	103,300	122,257
Terminalling and storage segment | Throughput and storage
Disaggregation of Revenue
Total revenues		75,223	80,864	87,397
Transportation segment
Disaggregation of Revenue
Total revenues		144,314	132,492	159,622
Transportation segment | Land transportation
Disaggregation of Revenue
Total revenues		111,611	88,652	98,895
Transportation segment | Inland transportation
Disaggregation of Revenue
Total revenues		29,536	40,507	54,834
Transportation segment | Offshore transportation
Disaggregation of Revenue
Total revenues		3,167	3,333	5,893
Sulfur service segment
Disaggregation of Revenue
Total revenues		145,042	108,007	111,340
Sulfur service segment | Sulfur product sales
Disaggregation of Revenue
Total revenues		32,416	24,176	30,135
Sulfur service segment | Fertilizer product sales
Disaggregation of Revenue
Total revenues		100,827	72,172	69,771
Sulfur service segment | Sulfur services
Disaggregation of Revenue
Total revenues		11,799	11,659	11,434
Natural gas liquids
Disaggregation of Revenue
Total revenues		414,043	247,479	366,502
Natural gas liquids | Natural gas liquids product sales
Disaggregation of Revenue
Total revenues		$ 414,043	$ 247,479	$ 366,502

[1] Related Party Transactions Included Above Year Ended December 31, 202120202019Revenues:   Terminalling and storage$62,677 $63,823 $71,733 Transportation20,046 21,997 24,243 Product sales479 317 931 Costs and expenses:   Cost of products sold: (excluding depreciation and amortization)   Sulfur services9,980 10,519 10,765           Terminalling and storage27,866 18,429 23,859 Expenses:   Operating expenses78,607 80,075 88,194 Selling, general and administrative32,924 32,886 32,622