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

3 Months Ended

6 Months Ended

Jun. 30, 2023

Jun. 30, 2022

Jun. 30, 2023

Jun. 30, 2022

Disaggregation of Revenue

Revenues

$ 195,636

$ 266,996

$ 440,165

$ 546,197

Throughput and storage

Disaggregation of Revenue

Revenues

^[1]

21,684

20,423

42,542

39,820

Sulfur services

Disaggregation of Revenue

Revenues

3,357

3,084

6,715

6,168

Terminalling and storage

Disaggregation of Revenue

Revenues

21,684

20,423

42,542

39,820

Terminalling and storage | Throughput and storage

Disaggregation of Revenue

Revenues

21,684

20,423

42,542

39,820

Transportation segment

Disaggregation of Revenue

Revenues

54,750

55,832

110,473

102,542

Transportation segment | Land transportation

Disaggregation of Revenue

Revenues

40,869

42,980

83,099

78,485

Transportation segment | Inland marine transportation

Disaggregation of Revenue

Revenues

12,357

11,036

24,435

20,455

Transportation segment | Offshore marine transportation

Disaggregation of Revenue

Revenues

1,524

1,816

2,939

3,602

Sulfur services segment

Disaggregation of Revenue

Revenues

40,330

56,953

76,009

116,076

Sulfur services segment | Sulfur product sales

Disaggregation of Revenue

Revenues

7,462

13,565

13,738

23,635

Sulfur services segment | Fertilizer product sales

Disaggregation of Revenue

Revenues

29,511

40,304

55,556

86,273

Sulfur services segment | Sulfur services

Disaggregation of Revenue

Revenues

3,357

3,084

6,715

6,168

Specialty products segment

Disaggregation of Revenue

Revenues

78,872

133,788

211,141

287,759

Specialty products segment | Natural gas liquids product sales

Disaggregation of Revenue

Revenues

45,678

97,318

143,900

217,724

Specialty products segment | Lubricant product sales

Disaggregation of Revenue

Revenues

$ 33,194

$ 36,470

$ 67,241

$ 70,035

[1]

Related Party Transactions Included Above

			Three Months Ended												Six Months Ended
			June 30,												June 30,
			2023						2022						2023						2022
Revenues:*
Terminalling and storage			$	18,077					$	17,416					$	35,579					$	33,620
Transportation			7,277						7,463						12,788						13,751
Product Sales			7,497						96						8,422						423
Costs and expenses:*
Cost of products sold: (excluding depreciation and amortization)
Specialty products			5,829						10,205						15,339						19,851
Sulfur services			2,644						2,592						5,352						5,268
Terminalling and storage			25						4						31						9
Expenses:
Operating expenses			25,058						23,447						48,885						44,826
Selling, general and administrative			6,556						7,498						15,072						16,306

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