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

3 Months Ended

9 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2023

Sep. 30, 2022

Disaggregation of Revenue

Revenues

$ 176,697

$ 229,305

$ 616,862

$ 775,502

Throughput and storage

Disaggregation of Revenue

Revenues

^[1]

22,202

19,988

64,744

59,808

Sulfur services

Disaggregation of Revenue

Revenues

3,358

3,085

10,073

9,253

Terminalling and storage

Disaggregation of Revenue

Revenues

22,202

19,988

64,744

59,808

Terminalling and storage | Throughput and storage

Disaggregation of Revenue

Revenues

22,202

19,988

64,744

59,808

Transportation segment

Disaggregation of Revenue

Revenues

55,223

58,993

165,696

161,535

Transportation segment | Land transportation

Disaggregation of Revenue

Revenues

40,965

45,604

124,064

124,089

Transportation segment | Inland marine transportation

Disaggregation of Revenue

Revenues

12,658

11,542

37,093

31,997

Transportation segment | Offshore marine transportation

Disaggregation of Revenue

Revenues

1,600

1,847

4,539

5,449

Sulfur services segment

Disaggregation of Revenue

Revenues

32,577

28,868

108,586

144,944

Sulfur services segment | Sulfur product sales

Disaggregation of Revenue

Revenues

8,453

10,341

22,191

33,975

Sulfur services segment | Fertilizer product sales

Disaggregation of Revenue

Revenues

20,766

15,442

76,322

101,716

Sulfur services segment | Sulfur services

Disaggregation of Revenue

Revenues

3,358

3,085

10,073

9,253

Specialty products segment

Disaggregation of Revenue

Revenues

66,695

121,456

277,836

409,215

Specialty products segment | Natural gas liquids product sales

Disaggregation of Revenue

Revenues

31,225

81,361

175,125

299,085

Specialty products segment | Lubricant product sales

Disaggregation of Revenue

Revenues

$ 35,470

$ 40,095

$ 102,711

$ 110,130

[1]

Related Party Transactions Included Above

			Three Months Ended												Nine Months Ended
			September 30,												September 30,
			2023						2022						2023						2022
Revenues:*
Terminalling and storage			$	18,542					$	16,065					$	54,121					$	49,685
Transportation			7,426						7,111						20,214						20,862
Product Sales			122						63						8,544						486
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products			9,896						10,196						27,324						30,047
Sulfur services			2,787						2,616						8,139						7,884
Terminalling and storage			23						5						54						14
Expenses:
Operating expenses			25,606						23,856						74,491						68,682
Selling, general and administrative			8,477						7,627						23,549						23,933

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