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Business Segments - Financial Information of Partnership's Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information |  |  |  |
Total consolidated revenues | $ 168,717 | $ 170,934 | $ 541,936 | $ 536,295
Depreciation and amortization | 12,336 | 12,608 | 37,790 | 37,944
(Gain) loss on sale or disposition of property, plant and equipment | (395) | (159) | (1,487) | (1,320)
Operating income | 6,894 | 12,651 | 36,179 | 50,473
Segment assets - as of September 30, 2024 | 510,122 | 554,757 | 510,122 | 554,757
Capital expenditures and plant turnaround costs | 11,044 | 12,535 | 22,667 | 43,132
Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 174,706 | 176,495 | 560,025 | 553,228
Direct product costs | 69,412 | 63,991 | 226,681 | 208,123
Manufacturing costs (plant, labor, transportation, and other) | 11,555 | 11,769 | 32,810 | 31,988
Segment gross margin | 93,739 | 100,735 | 300,534 | 313,117
Employment related expenses | 28,224 | 29,544 | 85,323 | 83,991
Driver pay | 11,305 | 12,393 | 34,891 | 38,260
Pass-through expenses | 6,465 | 6,081 | 20,088 | 21,088
Utilities, materials, and supplies | 4,483 | 3,942 | 13,448 | 12,658
Repairs and maintenance | 5,620 | 6,033 | 17,333 | 18,424
Insurance related expenses | 6,300 | 5,476 | 18,085 | 17,520
Lease expenses | 6,672 | 5,606 | 18,746 | 15,432
Other segment expenses | 5,836 | 6,560 | 20,138 | 18,647
Depreciation and amortization | 12,336 | 12,608 | 37,790 | 37,944
(Gain) loss on sale or disposition of property, plant and equipment | (396) | (159) | (1,487) | (1,320)
Operating expenses | 86,845 | 88,084 | 264,355 | 262,644
Operating income | 6,894 | 12,651 | 36,179 | 50,473
Elimination of intersegment revenues |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | (5,989) | (5,561) | (18,089) | (16,933)
Indirect selling, general and administrative |  |  |  |
Segment Reporting Information |  |  |  |
Employment related expenses | 3,036 | 3,026 | 9,295 | 9,271
Insurance related expenses | 13 | 0 | 105 | 0
Other segment expenses | 818 | 716 | 3,079 | 2,126
Operating expenses | 3,867 | 3,742 | 12,479 | 11,397
Operating income | (3,867) | (3,742) | (12,479) | (11,397)
Terminalling and storage |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 23,930 | 22,562 | 67,883 | 67,454
Terminalling and storage | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 25,799 | 24,414 | 73,441 | 73,101
Direct product costs | 0 | 0 | 0 | 0
Manufacturing costs (plant, labor, transportation, and other) | 0 | 23 | 0 | 65
Segment gross margin | 25,799 | 24,391 | 73,441 | 73,036
Employment related expenses | 6,727 | 6,726 | 19,863 | 18,771
Driver pay | 0 | 0 | 0 | 0
Pass-through expenses | 0 | 0 | 0 | 0
Utilities, materials, and supplies | 3,563 | 3,151 | 10,783 | 10,291
Repairs and maintenance | 883 | 1,436 | 3,188 | 4,103
Insurance related expenses | 1,558 | 1,501 | 4,589 | 5,759
Lease expenses | 1,111 | 1,179 | 3,343 | 3,120
Other segment expenses | 2,235 | 1,994 | 5,872 | 5,602
Depreciation and amortization | 5,143 | 5,695 | 16,123 | 16,819
(Gain) loss on sale or disposition of property, plant and equipment | 2 | 34 | (7) | (1,063)
Operating expenses | 21,222 | 21,716 | 63,754 | 63,402
Operating income | 4,577 | 2,675 | 9,687 | 9,634
Segment assets - as of September 30, 2024 | 155,876 | 192,058 | 155,876 | 192,058
Capital expenditures and plant turnaround costs | 2,808 | 2,193 | 5,655 | 11,318
Terminalling and storage | Elimination of intersegment revenues |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | (1,869) | (1,852) | (5,558) | (5,647)
Transportation segment |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 49,709 | 56,506 | 156,520 | 172,489
Transportation segment | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 53,790 | 60,196 | 168,966 | 183,705
Direct product costs | 0 | 0 | 0 | 0
Manufacturing costs (plant, labor, transportation, and other) | 0 | 0 | 0 | 0
Segment gross margin | 53,790 | 60,196 | 168,966 | 183,705
Employment related expenses | 15,012 | 15,348 | 45,448 | 44,885
Driver pay | 11,305 | 12,393 | 34,891 | 38,260
Pass-through expenses | 5,650 | 5,218 | 17,632 | 18,896
Utilities, materials, and supplies | 656 | 560 | 1,851 | 1,678
Repairs and maintenance | 4,618 | 4,451 | 13,594 | 13,951
Insurance related expenses | 4,489 | 3,808 | 12,734 | 11,243
Lease expenses | 5,424 | 4,298 | 14,979 | 11,916
Other segment expenses | 1,324 | 2,485 | 6,031 | 6,883
Depreciation and amortization | 2,907 | 3,182 | 8,755 | 10,039
(Gain) loss on sale or disposition of property, plant and equipment | (383) | (130) | (1,460) | (496)
Operating expenses | 51,002 | 51,613 | 154,455 | 157,255
Operating income | 2,788 | 8,583 | 14,511 | 26,450
Segment assets - as of September 30, 2024 | 159,937 | 166,448 | 159,937 | 166,448
Capital expenditures and plant turnaround costs | 2,217 | 1,929 | 7,116 | 6,554
Transportation segment | Elimination of intersegment revenues |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | (4,081) | (3,690) | (12,446) | (11,216)
Sulfur services segment |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 32,635 | 24,660 | 125,467 | 95,533
Sulfur services segment | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 32,635 | 24,660 | 125,467 | 95,534
Direct product costs | 16,878 | 8,302 | 66,302 | 43,482
Manufacturing costs (plant, labor, transportation, and other) | 7,237 | 6,990 | 19,126 | 16,764
Segment gross margin | 8,520 | 9,368 | 40,039 | 35,288
Employment related expenses | 2,105 | 2,654 | 6,489 | 6,736
Driver pay | 0 | 0 | 0 | 0
Pass-through expenses | 815 | 863 | 2,456 | 2,192
Utilities, materials, and supplies | 235 | 183 | 726 | 578
Repairs and maintenance | 118 | 139 | 541 | 354
Insurance related expenses | 195 | 132 | 535 | 427
Lease expenses | 117 | 101 | 351 | 302
Other segment expenses | 1,211 | 1,108 | 4,420 | 3,295
Depreciation and amortization | 3,531 | 2,937 | 10,644 | 8,697
(Gain) loss on sale or disposition of property, plant and equipment | (2) | (3) | (3) | 305
Operating expenses | 8,325 | 8,114 | 26,159 | 22,886
Operating income | 195 | 1,254 | 13,880 | 12,402
Segment assets - as of September 30, 2024 | 127,554 | 116,748 | 127,554 | 116,748
Capital expenditures and plant turnaround costs | 5,496 | 7,929 | 8,824 | 22,826
Sulfur services segment | Elimination of intersegment revenues |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 0 | 0 | 0 | (1)
Specialty Products |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 62,443 | 67,206 | 192,066 | 200,819
Specialty Products | Operating Segments |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | 62,482 | 67,225 | 192,151 | 200,888
Direct product costs | 52,534 | 55,689 | 160,379 | 164,641
Manufacturing costs (plant, labor, transportation, and other) | 4,318 | 4,756 | 13,684 | 15,159
Segment gross margin | 5,630 | 6,780 | 18,088 | 21,088
Employment related expenses | 1,344 | 1,790 | 4,228 | 4,328
Driver pay | 0 | 0 | 0 | 0
Pass-through expenses | 0 | 0 | 0 | 0
Utilities, materials, and supplies | 29 | 48 | 88 | 111
Repairs and maintenance | 1 | 7 | 10 | 16
Insurance related expenses | 45 | 35 | 122 | 91
Lease expenses | 20 | 28 | 73 | 94
Other segment expenses | 248 | 257 | 736 | 741
Depreciation and amortization | 755 | 794 | 2,268 | 2,389
(Gain) loss on sale or disposition of property, plant and equipment | (13) | (60) | (17) | (66)
Operating expenses | 2,429 | 2,899 | 7,508 | 7,704
Operating income | 3,201 | 3,881 | 10,580 | 13,384
Segment assets - as of September 30, 2024 | 66,755 | 79,503 | 66,755 | 79,503
Capital expenditures and plant turnaround costs | 523 | 484 | 1,072 | 2,434
Specialty Products | Elimination of intersegment revenues |  |  |  |
Segment Reporting Information |  |  |  |
Total consolidated revenues | $ (39) | $ (19) | $ (85) | $ (69)

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