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

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

Disaggregation of Revenue

Revenues

$ 244,529

$ 279,201

Throughput and storage

Disaggregation of Revenue

Revenues

^[1]

20,858

19,397

Sulfur services

Disaggregation of Revenue

Revenues

3,358

3,084

Terminalling and storage

Disaggregation of Revenue

Revenues

20,858

19,397

Terminalling and storage | Throughput and storage

Disaggregation of Revenue

Revenues

20,858

19,397

Transportation segment

Disaggregation of Revenue

Revenues

55,723

46,710

Transportation segment | Land transportation

Disaggregation of Revenue

Revenues

42,230

35,505

Transportation segment | Inland transportation

Disaggregation of Revenue

Revenues

12,078

9,419

Transportation segment | Offshore transportation

Disaggregation of Revenue

Revenues

1,415

1,786

Sulfur services segment

Disaggregation of Revenue

Revenues

35,679

59,123

Sulfur services segment | Sulfur product sales

Disaggregation of Revenue

Revenues

6,276

10,069

Sulfur services segment | Fertilizer product sales

Disaggregation of Revenue

Revenues

26,045

45,970

Sulfur services segment | Sulfur services

Disaggregation of Revenue

Revenues

3,358

3,084

Specialty products segment

Disaggregation of Revenue

Revenues

132,269

153,971

Specialty products segment | Natural gas liquids product sales

Disaggregation of Revenue

Revenues

98,222

120,406

Specialty products segment | Lubricant product sales

Disaggregation of Revenue

Revenues

$ 34,047

$ 33,565

[1]

Related Party Transactions Included Above

									Three Months Ended
									March 31,
															2023						2022
Revenues:*
Terminalling and storage															$	17,502					$	16,204
Transportation															5,511						6,288
Product Sales															925						321
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products															9,510						9,646
Sulfur services															2,708						2,676
Terminalling and storage															6						5
Expenses:
Operating expenses															23,827						21,380
Selling, general and administrative															8,516						8,808

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