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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2024

Mar. 31, 2023

Disaggregation of Revenue

Revenues

$ 180,830

$ 244,529

Throughput and storage

Disaggregation of Revenue

Revenues

^[1]

22,517

20,858

Sulfur services

Disaggregation of Revenue

Revenues

3,477

3,358

Terminalling and storage segment

Disaggregation of Revenue

Revenues

22,517

20,858

Terminalling and storage segment | Throughput and storage

Disaggregation of Revenue

Revenues

22,517

20,858

Transportation segment

Disaggregation of Revenue

Revenues

58,307

55,723

Transportation segment | Land transportation

Disaggregation of Revenue

Revenues

42,743

42,230

Transportation segment | Inland marine transportation

Disaggregation of Revenue

Revenues

14,323

12,078

Transportation segment | Offshore marine transportation

Disaggregation of Revenue

Revenues

1,241

1,415

Sulfur services segment

Disaggregation of Revenue

Revenues

33,681

35,679

Sulfur services segment | Sulfur product sales

Disaggregation of Revenue

Revenues

5,683

6,276

Sulfur services segment | Fertilizer product sales

Disaggregation of Revenue

Revenues

24,521

26,045

Sulfur services segment | Sulfur services

Disaggregation of Revenue

Revenues

3,477

3,358

Specialty products segment

Disaggregation of Revenue

Revenues

66,325

132,269

Specialty products segment | Natural gas liquids product sales

Disaggregation of Revenue

Revenues

38,131

98,222

Specialty products segment | Lubricant product sales

Disaggregation of Revenue

Revenues

$ 28,194

$ 34,047

[1]

Related Party Transactions Included Above

									Three Months Ended
									March 31,
															2024						2023
Revenues:*
Terminalling and storage															$	18,549					$	17,502
Transportation															8,601						5,511
Product Sales															129						925
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products															6,573						9,510
Sulfur services															2,993						2,708
Terminalling and storage															18						6
Expenses:
Operating expenses															26,423						23,827
Selling, general and administrative															6,863						8,516

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