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CONSOLIDATED STATEMENTS OF OPERATIONS - 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
Depreciation and amortization |  | 49,895 | 56,280 | 56,751
Total costs and expenses |  | 732,612 | 973,284 | 824,813
Other operating income (loss), net |  | 1,373 | 5,669 | (534)
Gain on involuntary conversion of property, plant and equipment |  | 0 | 0 | 196
Operating income |  | 66,724 | 51,263 | 57,280
Other income (expense): |  |  |  |
Interest expense, net |  | (60,290) | (53,665) | (54,107)
Loss on extinguishment of debt |  | (5,121) | 0 | 0
Other, net |  | 56 | (5) | (4)
Total other income (expense) |  | (65,355) | (53,670) | (54,111)
Net income (loss) before taxes |  | 1,369 | (2,407) | 3,169
Income tax expense |  | (5,918) | (7,927) | (3,380)
Net loss |  | (4,549) | (10,334) | (211)
Less general partner's interest in net loss |  | 91 | 207 | 4
Less loss allocable to unvested restricted units |  | 14 | 40 | 0
Limited partners' interest in net loss |  | $ (4,444) | $ (10,087) | $ (207)
Net loss per unit attributable to limited partners - basic (in dollars per share) |  | $ (0.11) | $ (0.26) | $ (0.01)
Net loss per unit attributable to limited partners - diluted (in dollars per share) |  | $ (0.11) | $ (0.26) | $ (0.01)
Weighted average limited partner units - basic (in shares) |  | 38,771,657 | 38,726,048 | 38,689,041
Weighted average limited partner units - diluted (in shares) |  | 38,771,657 | 38,726,048 | 38,689,041
Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | $ 86,514 | $ 80,193 | $ 75,223
Transportation |  |  |  |
Revenues: |  |  |  |
Revenues | [1] | 223,677 | 219,008 | 144,314
Sulfur services |  |  |  |
Revenues: |  |  |  |
Revenues |  | 13,430 | 12,337 | 11,799
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
[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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