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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue
Revenues	$ 180,676	$ 184,531	$ 373,219	$ 365,361
Sulfur services
Disaggregation of Revenue
Revenues	4,073	3,477	8,296	6,954
Terminalling and storage segment
Disaggregation of Revenue
Revenues	22,404	22,375	43,953	44,892
Terminalling and storage segment | Throughput and storage
Disaggregation of Revenue
Revenues	22,404	22,375	43,953	44,892
Transportation segment
Disaggregation of Revenue
Revenues	53,826	57,676	106,811	115,983
Transportation segment | Land transportation
Disaggregation of Revenue
Revenues	38,942	42,860	77,621	85,603
Transportation segment | Inland marine transportation
Disaggregation of Revenue
Revenues	12,678	12,977	24,680	27,300
Transportation segment | Offshore marine transportation
Disaggregation of Revenue
Revenues	2,206	1,839	4,510	3,080
Sulfur services segment
Disaggregation of Revenue
Revenues	44,128	37,192	92,832	70,873
Sulfur services segment | Sulfur product sales
Disaggregation of Revenue
Revenues	8,894	7,521	18,606	13,204
Sulfur services segment | Fertilizer product sales
Disaggregation of Revenue
Revenues	31,161	26,194	65,930	50,715
Sulfur services segment | Sulfur services
Disaggregation of Revenue
Revenues	4,073	3,477	8,296	6,954
Specialty products segment
Disaggregation of Revenue
Revenues	60,318	67,288	129,623	133,613
Specialty products segment | Natural gas liquids product sales
Disaggregation of Revenue
Revenues	32,976	35,435	75,096	73,566
Specialty products segment | Lubricant product sales
Disaggregation of Revenue
Revenues	$ 27,342	$ 31,853	$ 54,527	$ 60,047

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