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Related Party Transactions - Schedule of the Impact of Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |  |
Revenues |  | $ 707,622 | $ 797,963 | $ 1,018,878
Cost of products sold: |  |  |  |
Cost of products sold |  | 297,036 | 389,680 | 623,306
Operating expenses: |  |  |  |
Operating costs and expenses | [1] | 255,586 | 252,211 | 251,886
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses | [1] | 48,502 | 40,826 | 41,812
Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 89,067 | 86,514 | 80,193
Transportation |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 223,934 | 223,677 | 219,008
Specialty products |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 264,850 | 346,777 | 540,513
Cost of products sold: |  |  |  |
Cost of products sold | [1] | 228,600 | 305,903 | 503,225
Product sales |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 380,049 | 474,342 | 707,340
Sulfur services |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 115,199 | 127,565 | 166,827
Cost of products sold: |  |  |  |
Cost of products sold | [1] | 68,364 | 83,702 | 120,062
Terminalling and storage |  |  |  |
Cost of products sold: |  |  |  |
Cost of products sold | [1] | 72 | 75 | 19
Related Party |  |  |  |
Revenues: |  |  |  |
Revenues |  | 106,170 | 110,181 | 95,814
Cost of products sold: |  |  |  |
Cost of products sold |  | 43,776 | 47,187 | 50,092
Operating expenses: |  |  |  |
Operating costs and expenses |  | 106,831 | 100,851 | 93,630
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 39,385 | 32,021 | 31,758
Related Party | Indirect overhead allocation, net of reimbursement |  |  |  |
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 14,235 | 14,448 | 13,919
Related Party | Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Revenues |  | 71,799 | 72,138 | 66,867
Related Party | Transportation |  |  |  |
Revenues: |  |  |  |
Revenues |  | 33,250 | 29,276 | 28,393
Operating expenses: |  |  |  |
Operating costs and expenses |  | 79,441 | 73,866 | 66,682
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 11,218 | 8,927 | 7,553
Related Party | Specialty products |  |  |  |
Revenues: |  |  |  |
Revenues |  | 352 | 8,547 | 150
Cost of products sold: |  |  |  |
Cost of products sold |  | 31,789 | 35,930 | 39,356
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 5,454 | 4,152 | 5,565
Related Party | Product sales |  |  |  |
Revenues: |  |  |  |
Revenues |  | 457 | 8,767 | 554
Related Party | Sulfur services |  |  |  |
Revenues: |  |  |  |
Revenues |  | 105 | 220 | 404
Cost of products sold: |  |  |  |
Cost of products sold |  | 11,915 | 11,182 | 10,717
Operating expenses: |  |  |  |
Operating costs and expenses |  | 4,888 | 5,738 | 6,165
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 5,427 | 3,714 | 3,917
Related Party | Terminalling and storage |  |  |  |
Cost of products sold: |  |  |  |
Cost of products sold |  | 72 | 75 | 19
Operating expenses: |  |  |  |
Operating costs and expenses |  | 22,502 | 21,247 | 20,783
Selling, general and administrative: |  |  |  |
Selling, general and administrative expenses |  | 3,051 | 780 | 804
Related Party | Sulfur Services |  |  |  |
Revenues: |  |  |  |
Revenues |  | $ 664 | $ 0 | $ 0
[1] | Related Party Transactions Included Above
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
Revenues: |  |  |  |  |
Terminalling and storage | $ | 71,799 |  |  | $ | 72,138 |  |  | $ | 66,867 |
Transportation | 33,250 |  |  | 29,276 |  |  | 28,393 |
Sulfur Services | 664 |  |  | — |  |  | — |
Product sales | 457 |  |  | 8,767 |  |  | 554 |
Costs and expenses: |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Specialty products | 31,789 |  |  | 35,930 |  |  | 39,356 |
Sulfur services | 11,915 |  |  | 11,182 |  |  | 10,717 |
Terminalling and storage | 72 |  |  | 75 |  |  | 19 |
Expenses: |  |  |  |  |
Operating expenses | 106,831 |  |  | 100,851 |  |  | 93,630 |
Selling, general and administrative | 39,385 |  |  | 32,021 |  |  | 31,758 |

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