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Business Segments - Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information |  |  |
Revenues | $ (707,622) | $ (797,963) | $ (1,018,878)
Depreciation and amortization | 50,787 | 49,895 | 56,280
(Gain) loss on sale or disposition of property, plant and equipment | (1,584) | (1,373) | (5,669)
Costs and expenses | 651,911 | 732,612 | 973,284
Operating income (loss) | 57,295 | 66,724 | 51,263
Segment assets | 538,509 | 509,375 | 598,851
Capital expenditures and plant turnaround costs | 52,623 | 40,136 | 31,133
Operating Segments |  |  |
Segment Reporting Information |  |  |
Revenues | (731,079) | (824,243) | (1,051,687)
Direct product costs | 275,968 | 369,007 | 576,094
Manufacturing costs (plant, labor, transportation, and other) | 41,490 | 44,109 | 76,986
Segment gross margin | 413,621 | 411,127 | 398,607
Employment related expenses | 113,952 | 105,477 | 102,290
Driver pay | 50,573 | 52,650 | 52,178
Pass-through expenses | 27,379 | 30,853 | 38,343
Utilities, materials, and supplies | 16,776 | 20,379 | 21,479
Repairs and maintenance | 24,716 | 27,226 | 25,511
Insurance related expenses | 23,677 | 19,462 | 16,774
Lease expenses | 21,351 | 15,833 | 15,230
Other segment expenses | 28,699 | 24,001 | 24,928
Depreciation and amortization | 50,787 | 49,895 | 56,280
(Gain) loss on sale or disposition of property, plant and equipment | (1,584) | (1,373) | (5,669)
Costs and expenses | 356,326 | 344,403 | 347,344
Operating income (loss) | 57,295 | 66,724 | 51,263
Elimination of intersegment revenues |  |  |
Segment Reporting Information |  |  |
Revenues | 23,457 | 26,280 | 32,809
Indirect selling, general and administrative |  |  |
Segment Reporting Information |  |  |
Employment related expenses | 12,267 | 12,755 | 13,715
Insurance related expenses | 825 |  | 2
Other segment expenses | 6,464 | 3,275 | 3,197
Costs and expenses | 19,556 | 16,030 | 16,914
Operating income (loss) | (19,556) | (16,030) | (16,914)
Indirect selling, general and administrative | Martin Resource Management Corporation |  |  |
Segment Reporting Information |  |  |
Other segment expenses | 3,674 |  |
Terminalling and storage |  |  |
Segment Reporting Information |  |  |
Revenues | (89,067) | (86,514) | (80,193)
Terminalling and storage | Operating Segments |  |  |
Segment Reporting Information |  |  |
Revenues | (96,555) | (95,459) | (92,612)
Direct product costs | 0 | 0 | 0
Manufacturing costs (plant, labor, transportation, and other) | 72 | 75 | 19
Segment gross margin | 96,483 | 95,384 | 92,593
Employment related expenses | 25,714 | 23,018 | 22,612
Driver pay | 0 | 0 | 0
Pass-through expenses | 0 | 0 | 13
Utilities, materials, and supplies | 13,591 | 16,863 | 17,996
Repairs and maintenance | 5,776 | 4,259 | 3,937
Insurance related expenses | 6,914 | 4,525 | 4,964
Lease expenses | 4,268 | 3,779 | 8,432
Other segment expenses | 7,470 | 7,019 | 7,190
Depreciation and amortization | 22,757 | 21,030 | 26,094
(Gain) loss on sale or disposition of property, plant and equipment | (1,105) | 359 | 166
Costs and expenses | 85,385 | 80,852 | 91,404
Operating income (loss) | 11,098 | 14,532 | 1,189
Segment assets | 180,769 | 171,320 | 184,537
Capital expenditures and plant turnaround costs | 13,764 | 13,168 | 15,308
Terminalling and storage | Elimination of intersegment revenues |  |  |
Segment Reporting Information |  |  |
Revenues | 7,488 | 8,945 | 12,419
Transportation |  |  |
Segment Reporting Information |  |  |
Revenues | (223,934) | (223,677) | (219,008)
Transportation | Operating Segments |  |  |
Segment Reporting Information |  |  |
Revenues | (239,807) | (240,926) | (239,275)
Direct product costs | 0 | 0 | 0
Manufacturing costs (plant, labor, transportation, and other) | 0 | 0 | 0
Segment gross margin | 239,807 | 240,926 | 239,275
Employment related expenses | 60,882 | 56,244 | 50,626
Driver pay | 50,573 | 52,650 | 52,178
Pass-through expenses | 24,454 | 27,196 | 33,998
Utilities, materials, and supplies | 2,254 | 2,134 | 2,172
Repairs and maintenance | 18,219 | 22,582 | 20,900
Insurance related expenses | 15,083 | 14,056 | 10,499
Lease expenses | 16,548 | 11,544 | 6,352
Other segment expenses | 9,296 | 7,715 | 7,688
Depreciation and amortization | 13,027 | 14,879 | 14,567
(Gain) loss on sale or disposition of property, plant and equipment | (713) | (1,775) | (1,062)
Costs and expenses | 209,623 | 207,225 | 197,918
Operating income (loss) | 30,184 | 33,701 | 41,357
Segment assets | 165,093 | 161,506 | 153,451
Capital expenditures and plant turnaround costs | 9,188 | 7,598 | 7,619
Transportation | Elimination of intersegment revenues |  |  |
Segment Reporting Information |  |  |
Revenues | 15,873 | 17,249 | 20,267
Sulfur Services |  |  |
Segment Reporting Information |  |  |
Revenues | (129,771) | (140,995) | (179,164)
Sulfur Services | Operating Segments |  |  |
Segment Reporting Information |  |  |
Revenues | (129,772) | (140,995) | (179,164)
Direct product costs | 58,102 | 75,002 | 96,793
Manufacturing costs (plant, labor, transportation, and other) | 21,882 | 18,839 | 30,225
Segment gross margin | 49,788 | 47,154 | 52,146
Employment related expenses | 9,148 | 7,997 | 8,137
Driver pay | 0 | 0 | 0
Pass-through expenses | 2,925 | 3,657 | 4,332
Utilities, materials, and supplies | 794 | 1,225 | 1,131
Repairs and maintenance | 706 | 340 | 613
Insurance related expenses | 730 | 759 | 1,115
Lease expenses | 414 | 375 | 303
Other segment expenses | 4,473 | 4,716 | 5,785
Depreciation and amortization | 11,769 | 10,690 | 11,099
(Gain) loss on sale or disposition of property, plant and equipment | 298 | (17) | (4,555)
Costs and expenses | 31,257 | 29,742 | 27,960
Operating income (loss) | 18,531 | 17,412 | 24,186
Segment assets | 126,074 | 103,779 | 110,688
Capital expenditures and plant turnaround costs | 26,380 | 16,851 | 6,857
Sulfur Services | Elimination of intersegment revenues |  |  |
Segment Reporting Information |  |  |
Revenues | 1 | 0 | 0
Specialty Products |  |  |
Segment Reporting Information |  |  |
Revenues | (264,850) | (346,777) | (540,513)
Specialty Products | Operating Segments |  |  |
Segment Reporting Information |  |  |
Revenues | (264,945) | (346,863) | (540,636)
Direct product costs | 217,866 | 294,005 | 479,301
Manufacturing costs (plant, labor, transportation, and other) | 19,536 | 25,195 | 46,742
Segment gross margin | 27,543 | 27,663 | 14,593
Employment related expenses | 5,941 | 5,463 | 7,200
Driver pay | 0 | 0 | 0
Pass-through expenses | 0 | 0 | 0
Utilities, materials, and supplies | 137 | 157 | 180
Repairs and maintenance | 15 | 45 | 61
Insurance related expenses | 125 | 122 | 194
Lease expenses | 121 | 135 | 143
Other segment expenses | 996 | 1,276 | 1,068
Depreciation and amortization | 3,234 | 3,296 | 4,520
(Gain) loss on sale or disposition of property, plant and equipment | (64) | (60) | 218
Costs and expenses | 10,505 | 10,554 | 13,148
Operating income (loss) | 17,038 | 17,109 | 1,445
Segment assets | 66,573 | 72,770 | 150,175
Capital expenditures and plant turnaround costs | 3,291 | 2,519 | 1,349
Specialty Products | Elimination of intersegment revenues |  |  |
Segment Reporting Information |  |  |
Revenues | $ 95 | $ 86 | $ 123

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