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CONSOLIDATED STATEMENTS OF OPERATIONS - (Related Party Transactions) (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues: |  |  |  |
Revenues |  | $ 797,963 | $ 1,018,878 | $ 882,431
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold |  | 389,680 | 623,306 | 533,098
Expenses: |  |  |  |
Operating expenses | [1] | 252,211 | 251,886 | 193,952
Selling, general and administrative | [1] | 40,826 | 41,812 | 41,012
Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 86,514 | 80,193 | 75,223
Transportation |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 223,677 | 219,008 | 144,314
Product sales |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 474,342 | 707,340 | 651,095
Specialty products |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 346,777 | 540,513 | 517,852
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold | [1] | 305,903 | 503,225 | 443,896
Sulfur services |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 127,565 | 166,827 | 133,243
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold | [1] | 83,702 | 120,062 | 89,134
Terminalling and storage |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold | [1] | 75 | 19 | 68
Related Party |  |  |  |
Revenues: |  |  |  |
Revenues |  | 110,181 | 95,814 | 83,202
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold |  | 47,187 | 50,092 | 37,846
Expenses: |  |  |  |
Operating expenses |  | 100,851 | 93,630 | 78,607
Selling, general and administrative |  | 32,021 | 31,758 | 32,924
Related Party | Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Revenues |  | 72,138 | 66,867 | 62,677
Related Party | Transportation |  |  |  |
Revenues: |  |  |  |
Revenues |  | 29,276 | 28,393 | 20,046
Expenses: |  |  |  |
Operating expenses |  | 73,866 | 66,682 | 55,382
Selling, general and administrative |  | 8,927 | 7,553 | 6,996
Related Party | Product sales |  |  |  |
Revenues: |  |  |  |
Revenues |  | 8,767 | 554 | 479
Related Party | Specialty products |  |  |  |
Revenues: |  |  |  |
Revenues |  | 8,547 | 404 | 370
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold |  | 35,930 | 39,356 | 27,856
Expenses: |  |  |  |
Selling, general and administrative |  | 4,152 | 5,565 | 7,414
Related Party | Sulfur services |  |  |  |
Revenues: |  |  |  |
Revenues |  | 220 | 150 | 109
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold |  | 11,182 | 10,717 | 9,980
Expenses: |  |  |  |
Operating expenses |  | 5,738 | 6,165 | 4,411
Selling, general and administrative |  | 3,714 | 3,917 | 3,276
Related Party | Terminalling and storage |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Cost of products sold |  | 75 | 19 | 10
Expenses: |  |  |  |
Operating expenses |  | 21,247 | 20,783 | 18,814
Selling, general and administrative |  | $ 780 | $ 804 | $ 546
[1] | Related Party Transactions Included Above
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Revenues: |  |  |  |  |
Terminalling and storage | $ | 72,138 |  |  | $ | 66,867 |  |  | $ | 62,677 |
Transportation | 29,276 |  |  | 28,393 |  |  | 20,046 |
Product sales | 8,767 |  |  | 554 |  |  | 479 |
Costs and expenses: |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Specialty products | 35,930 |  |  | 39,356 |  |  | 27,856 |
Sulfur services | 11,182 |  |  | 10,717 |  |  | 9,980 |
Terminalling and storage | 75 |  |  | 19 |  |  | 10 |
Expenses: |  |  |  |  |
Operating expenses | 100,851 |  |  | 93,630 |  |  | 78,607 |
Selling, general and administrative | 32,021 |  |  | 31,758 |  |  | 32,924 |

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