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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue
Revenues	$ 192,543	$ 180,830
Sulfur services
Disaggregation of Revenue
Revenues	4,223	3,477
Terminalling and storage segment
Disaggregation of Revenue
Revenues	21,549	22,517
Terminalling and storage segment | Throughput and storage
Disaggregation of Revenue
Revenues	21,549	22,517
Transportation segment
Disaggregation of Revenue
Revenues	52,985	58,307
Transportation segment | Land transportation
Disaggregation of Revenue
Revenues	38,679	42,743
Transportation segment | Inland marine transportation
Disaggregation of Revenue
Revenues	12,002	14,323
Transportation segment | Offshore marine transportation
Disaggregation of Revenue
Revenues	2,304	1,241
Sulfur services segment
Disaggregation of Revenue
Revenues	48,704	33,681
Sulfur services segment | Sulfur product sales
Disaggregation of Revenue
Revenues	9,712	5,683
Sulfur services segment | Fertilizer product sales
Disaggregation of Revenue
Revenues	34,769	24,521
Sulfur services segment | Sulfur services
Disaggregation of Revenue
Revenues	4,223	3,477
Specialty products segment
Disaggregation of Revenue
Revenues	69,305	66,325
Specialty products segment | Natural gas liquids product sales
Disaggregation of Revenue
Revenues	42,120	38,131
Specialty products segment | Lubricant product sales
Disaggregation of Revenue
Revenues	$ 27,185	$ 28,194

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