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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenues: |  |  |  |
Total revenues |  | $ 1,018,878 | $ 882,431 | $ 672,142
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Total cost of products sold (excluding depreciation and amortization) |  | 623,306 | 533,098 | 356,926
Expenses: |  |  |  |
Operating expenses | [1] | 251,886 | 193,952 | 183,747
Selling, general and administrative | [1] | 41,812 | 41,012 | 40,900
Depreciation and amortization |  | 56,280 | 56,751 | 61,462
Total costs and expenses |  | 973,284 | 824,813 | 643,035
Other operating income (loss), net |  | 5,669 | (534) | 12,488
Gain on involuntary conversion of property, plant and equipment |  | 0 | 196 | 4,907
Operating income |  | 51,263 | 57,280 | 46,502
Other income (expense): |  |  |  |
Interest expense, net |  | (53,665) | (54,107) | (46,210)
Gain on retirement of senior unsecured notes |  | 0 | 0 | 3,484
Loss on exchange of senior unsecured notes |  | 0 | 0 | (8,817)
Other, net |  | (5) | (4) | 6
Total other income (expense) |  | (53,670) | (54,111) | (51,537)
Net income (loss) before taxes |  | (2,407) | 3,169 | (5,035)
Income tax expense |  | (7,927) | (3,380) | (1,736)
Net loss |  | (10,334) | (211) | (6,771)
Less general partner's interest in net loss |  | 207 | 4 | 135
Less loss allocable to unvested restricted units |  | 40 | 0 | 21
Limited partners' interest in net loss |  | $ (10,087) | $ (207) | $ (6,615)
Net loss per unit attributable to limited partners - basic (in dollars per share) |  | $ (0.26) | $ (0.01) | $ (0.17)
Net loss per unit attributable to limited partners - diluted (in dollars per share) |  | $ (0.26) | $ (0.01) | $ (0.17)
Weighted average limited partner units - diluted (in shares) |  | 38,726,048 | 38,689,041 | 38,656,559
Basic weighted average limited partner units outstanding (in shares) |  | 38,726,048 | 38,689,041 | 38,656,559
Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | $ 80,268 | $ 75,223 | $ 80,864
Transportation |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | 219,008 | 144,314 | 132,492
Sulfur services |  |  |  |
Revenues: |  |  |  |
Total revenues |  | 12,337 | 11,799 | 11,659
Product sales |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | 707,265 | 651,095 | 447,127
Natural gas liquids |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | 398,422 | 414,043 | 247,479
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Total cost of products sold (excluding depreciation and amortization) | [1] | 389,504 | 362,706 | 215,895
Sulfur services |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | 166,827 | 133,243 | 96,348
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Total cost of products sold (excluding depreciation and amortization) | [1] | 120,062 | 89,134 | 58,515
Terminalling and storage |  |  |  |
Revenues: |  |  |  |
Total revenues | [1] | 142,016 | 103,809 | 103,300
Cost of products sold: (excluding depreciation and amortization) |  |  |  |
Total cost of products sold (excluding depreciation and amortization) | [1] | $ 113,740 | $ 81,258 | $ 82,516
[1] | Related Party Transactions Included Above
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Revenues: |  |  |  |  |
Terminalling and storage | $ | 66,867 |  |  | $ | 62,677 |  |  | $ | 63,823 |
Transportation | 28,393 |  |  | 20,046 |  |  | 21,997 |
Product sales | 554 |  |  | 479 |  |  | 317 |
Costs and expenses: |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Sulfur services | 10,717 |  |  | 9,980 |  |  | 10,519 |
Terminalling and storage | 39,375 |  |  | 27,866 |  |  | 18,429 |
Expenses: |  |  |  |  |
Operating expenses | 93,630 |  |  | 78,607 |  |  | 80,075 |
Selling, general and administrative | 31,758 |  |  | 32,924 |  |  | 32,886 |

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