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CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenues: |  |  |  |  |
Revenues |  | $ 266,996 | $ 184,293 | $ 546,197 | $ 385,267
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Cost of products sold |  | 156,926 | 105,993 | 328,508 | 220,844
Expenses: |  |  |  |  |
Operating expenses | [1] | 64,082 | 47,313 | 120,577 | 91,947
Selling, general and administrative | [1] | 9,944 | 8,960 | 21,147 | 19,569
Depreciation and amortization |  | 14,800 | 14,483 | 29,286 | 28,917
Total costs and expenses |  | 245,752 | 176,749 | 499,518 | 361,277
Other operating income (loss), net |  | 246 | 89 | 260 | (671)
Operating income |  | 21,490 | 7,633 | 46,939 | 23,319
Other income (expense): |  |  |  |  |
Interest expense, net |  | (12,846) | (13,309) | (25,275) | (26,262)
Other, net |  | (1) | (1) | (2) | (1)
Total other expense |  | (12,847) | (13,310) | (25,277) | (26,263)
Net income before taxes |  | 8,643 | (5,677) | 21,662 | (2,944)
Income tax expense |  | (2,037) | (935) | (3,578) | (1,157)
Net income |  | 6,606 | (6,612) | 18,084 | (4,101)
Less general partner's interest in net income |  | (132) | 132 | (362) | 82
Less income allocable to unvested restricted units |  | (21) | 20 | (51) | 10
Limited partners' interest in net income |  | $ 6,453 | $ (6,460) | $ 17,671 | $ (4,009)
Net income per unit attributable to limited partners - basic (in dollars per share) |  | $ 0.17 | $ (0.17) | $ 0.46 | $ (0.10)
Net income per unit attributable to limited partners - diluted (in dollars per share) |  | $ 0.17 | $ (0.17) | $ 0.46 | $ (0.10)
Weighted average limited partner units - basic (in shares) |  | 38,729,118 | 38,687,874 | 38,725,701 | 38,690,228
Weighted average limited partner units - diluted (in shares) |  | 38,750,153 | 38,687,874 | 38,753,197 | 38,690,228
Terminalling and storage |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | $ 20,439 | $ 18,702 | $ 39,852 | $ 37,080
Transportation |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | 55,832 | 34,926 | 102,542 | 64,741
Sulfur services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 3,084 | 2,949 | 6,168 | 5,899
Product sales |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | 187,641 | 127,716 | 397,635 | 277,547
Natural gas liquids |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | 97,580 | 67,232 | 218,143 | 165,317
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Cost of products sold | [1] | 91,584 | 61,590 | 198,682 | 140,725
Sulfur services |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | 53,869 | 35,337 | 109,908 | 67,222
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Cost of products sold | [1] | 37,063 | 24,177 | 74,848 | 45,391
Terminalling and storage |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | [1] | 36,192 | 25,147 | 69,584 | 45,008
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |
Cost of products sold | [1] | $ 28,279 | $ 20,226 | $ 54,978 | $ 34,728
[1] | Related Party Transactions Included Above
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Revenues:* |  |  |  |  |  |  |
Terminalling and storage | $ | 17,416 |  |  | $ | 15,569 |  |  | $ | 33,620 |  |  | $ | 30,875 |
Transportation | 7,463 |  |  | 4,889 |  |  | 13,751 |  |  | 8,899 |
Product Sales | 95 |  |  | 71 |  |  | 416 |  |  | 185 |
Costs and expenses:* |  |  |  |  |  |  |
Cost of products sold: (excluding depreciation and amortization) |  |  |  |  |  |  |
Sulfur services | 2,592 |  |  | 2,403 |  |  | 5,268 |  |  | 4,938 |
Terminalling and storage | 10,209 |  |  | 7,036 |  |  | 19,860 |  |  | 11,604 |
Expenses: |  |  |  |  |  |  |
Operating expenses | 23,446 |  |  | 19,590 |  |  | 44,826 |  |  | 37,958 |
Selling, general and administrative | 7,498 |  |  | 7,285 |  |  | 16,306 |  |  | 15,965 |

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