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Business Segments
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Business Segments BUSINESS SEGMENTS
    The Chief Operating Decision Maker ("CODM") is a group of executives, comprised of the Chief Executive Officer, Chief Financial Officer and Chief Operating Officer of the Partnership's general partner. The CODM may use different operating measures to assess operating results and allocate resources among the Partnership's four segments (outlined below), however the measure that is most consistent with the amounts included in the consolidated financial statements is operating income. The CODM utilizes this measure to evaluate the current financial performance and project the future financial performance of each segment to determine the allocation of capital resources.

The Partnership's four reportable segments are comprised of (1) Terminalling and Storage, (2) Transportation, (3) Sulfur Services and (4) Specialty Products. The operating segments within each of our reportable segments have been aggregated based on the similarity of their economic and other characteristics, including different product type and services.

The Terminalling and Storage segment generates revenue by providing terminalling, processing, and storage services for petroleum products and by-products. Storage revenue is earned through contracted monthly tank fixed fees, while throughput revenue is based on the volume moved through the Partnership’s terminals at contracted rates. Tolling revenue is derived from contracted monthly reservation fees and throughput volumes processed at the facility.

The Transportation segment earns revenue by offering land and marine transportation services for petroleum products, by-products, chemicals, and specialty products. Land transportation revenue is based on mileage rates for line hauls or completion of contracted trips. Marine transportation revenue comes from time charters, calculated on a per-day basis, or from the completion of contracted trips.

The Sulfur Services segment generates revenue by providing processing, manufacturing, marketing, and distribution services for sulfur and sulfur-based products. Revenue from sulfur and fertilizer product sales is recognized when the customer takes title to the product. Revenue from sulfur services is earned as services are performed during each monthly period.
The Specialty Products segment earns revenue by providing marketing, distribution, and transportation services for NGLs as well as blending and packaging services for specialty lubricants and greases. NGL revenue is recognized upon the sale of products via truck, rail, or pipeline. For lubricants and greases, revenue is recognized upon their sale by truck or rail.

The following tables present selected financial information with respect to the Partnership's operating segments for the three and nine months ended September 30, 2025 and 2024.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Three Months Ended September 30, 2025
Operating revenues from external customers23,930 49,709 32,635 62,443 — $168,717 
Intersegment operating revenues 1,869 4,081 — 39 — 5,989 
Total segment revenues25,799 53,790 32,635 62,482 — 174,706 
Reconciliation of revenues:
Elimination of intersegment revenues(1,869)(4,081)— (39)— (5,989)
Total consolidated revenues23,930 49,709 32,635 62,443 — 168,717 
Less: cost of products sold:
Direct product costs— — 16,878 52,534 — 69,412 
Manufacturing costs (plant, labor, transportation, and other)— — 7,237 4,318 — 11,555 
Segment gross margin25,799 53,790 8,520 5,630 — 93,739 
Less:
Employment related expenses2
6,727 15,012 2,105 1,344 3,036 28,224 
Driver pay — 11,305 — — — 11,305 
Pass-through expenses— 5,650 815 — — 6,465 
Utilities, materials, and supplies3,563 656 235 29 — 4,483 
Repairs and maintenance883 4,618 118 1 — 5,620 
Insurance related expenses1,558 4,489 195 45 13 6,300 
Lease expenses1,111 5,424 117 20 — 6,672 
Other segment expenses1
2,235 1,324 1,211 248 818 5,836 
Depreciation and amortization5,143 2,907 3,531 755 — 12,336 
(Gain) loss on sale or disposition of property, plant and equipment2 (383)(2)(13)— (396)
21,222 51,002 8,325 2,429 3,867 86,845 
Operating income (loss)$4,577 $2,788 $195 $3,201 $(3,867)$6,894 
Segment assets - as of September 30, 2025$155,876 $159,937 $127,554 $66,755 $— $510,122 
Capital expenditures and plant turnaround costs$2,808 $2,217 $5,496 $523 $— $11,044 

1 Other segment expenses include outside services, property taxes, terminalling fees, regulatory expenses, professional fees, communications expenses, and many other less significant expense categories used in operations.
2 These employment expenses include allocated overhead from Martin Resource Management Corporation and exclude those that are part of our manufacturing operations. Payroll expenses in our manufacturing operations are included in cost of products sold.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Nine Months Ended September 30, 2025
Operating revenues from external customers$67,883 $156,520 $125,467 $192,066 $— $541,936 
Intersegment operating revenues 5,558 12,446 — 85 — 18,089 
Total segment revenues73,441 168,966 125,467 192,151 — 560,025 
Reconciliation of revenues:
Elimination of intersegment revenues(5,558)(12,446)— (85)— (18,089)
Total consolidated revenues67,883 156,520 125,467 192,066 — 541,936 
Less: cost of products sold:
Direct product costs— — 66,302 160,379 — 226,681 
Manufacturing costs (plant, labor, transportation, and other)— — 19,126 13,684 — 32,810 
Segment gross margin73,441 168,966 40,039 18,088 — 300,534 
Less:
Employment related expenses2
19,863 45,448 6,489 4,228 9,295 85,323 
Driver pay — 34,891 — — — 34,891 
Pass-through expenses— 17,632 2,456 — — 20,088 
Utilities, materials, and supplies10,783 1,851 726 88 — 13,448 
Repairs and maintenance3,188 13,594 541 10 — 17,333 
Insurance related expenses4,589 12,734 535 122 105 18,085 
Lease expenses3,343 14,979 351 73 — 18,746 
Other segment expenses1
5,872 6,031 4,420 736 3,079 20,138 
Depreciation and amortization16,123 8,755 10,644 2,268 — 37,790 
(Gain) loss on sale or disposition of property, plant and equipment(7)(1,460)(3)(17)— (1,487)
63,754 154,455 26,159 7,508 12,479 264,355 
Operating income (loss)$9,687 $14,511 $13,880 $10,580 $(12,479)$36,179 
Segment assets - as of September 30, 2025$155,876 $159,937 $127,554 $66,755 $— $510,122 
Capital expenditures and plant turnaround costs$5,655 $7,116 $8,824 $1,072 $— $22,667 

1 Other segment expenses include outside services, property taxes, terminalling fees, regulatory expenses, professional fees, communications expenses, and many other less significant expense categories used in operations.

2 These employment expenses include allocated overhead from Martin Resource Management Corporation and exclude those that are part of our manufacturing operations. Payroll expenses in our manufacturing operations are included in cost of products sold.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Three Months Ended September 30, 2024
Operating revenues from external customers$22,562 $56,506 $24,660 $67,206 $— $170,934 
Intersegment operating revenues 1,852 3,690 — 19 — 5,561 
Total segment revenues24,414 60,196 24,660 67,225 — 176,495 
Reconciliation of revenues:
Elimination of intersegment revenues(1,852)(3,690)— (19)— (5,561)
Total consolidated revenues22,562 56,506 24,660 67,206 — 170,934 
Less: cost of products sold:
Direct product costs— — 8,302 55,689 — 63,991 
Manufacturing costs (plant, labor, transportation, and other)23 — 6,990 4,756 — 11,769 
Segment gross margin24,391 60,196 9,368 6,780 — 100,735 
Less:
Employment related expenses2
6,726 15,348 2,654 1,790 3,026 29,544 
Driver pay — 12,393 — — — 12,393 
Pass-through expenses— 5,218 863 — — 6,081 
Utilities, materials, and supplies3,151 560 183 48 — 3,942 
Repairs and maintenance1,436 4,451 139 7 — 6,033 
Insurance related expenses1,501 3,808 132 35 — 5,476 
Lease expenses1,179 4,298 101 28 — 5,606 
Other segment expenses1
1,994 2,485 1,108 257 716 6,560 
Depreciation and amortization5,695 3,182 2,937 794 — 12,608 
(Gain) loss on sale or disposition of property, plant and equipment34 (130)(3)(60)— (159)
21,716 51,613 8,114 2,899 3,742 88,084 
Operating income (loss)$2,675 $8,583 $1,254 $3,881 $(3,742)$12,651 
Segment assets - as of September 30, 2024$192,058 $166,448 $116,748 $79,503 $— $554,757 
Capital expenditures and plant turnaround costs$2,193 $1,929 $7,929 $484 $— $12,535 

1 Other segment expenses include outside services, property taxes, terminalling fees, regulatory expenses, professional fees, communications expenses, and many other less significant expense categories used in operations.

2 These employment expenses include allocated overhead from Martin Resource Management Corporation and exclude those that are part of our manufacturing operations. Payroll expenses in our manufacturing operations are included in cost of products sold.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Nine Months Ended September 30, 2024
Operating revenues from external customers$67,454 $172,489 $95,533 $200,819 $— $536,295 
Intersegment operating revenues 5,647 11,216 1 69 — 16,933 
Total segment revenues73,101 183,705 95,534 200,888 — 553,228 
Reconciliation of revenues:
Elimination of intersegment revenues(5,647)(11,216)(1)(69)— (16,933)
Total consolidated revenues67,454 172,489 95,533 200,819 — 536,295 
— 
Less: cost of products sold:
Direct product costs— — 43,482 164,641 — 208,123 
Manufacturing costs (plant, labor, transportation, and other)65 — 16,764 15,159 — 31,988 
Segment gross margin73,036 183,705 35,288 21,088 — 313,117 
Less:
Employment related expenses2
18,771 44,885 6,736 4,328 9,271 83,991 
Driver pay — 38,260 — — — 38,260 
Pass-through expenses— 18,896 2,192 — — 21,088 
Utilities, materials, and supplies10,291 1,678 578 111 — 12,658 
Repairs and maintenance4,103 13,951 354 16 — 18,424 
Insurance related expenses5,759 11,243 427 91 — 17,520 
Lease expenses3,120 11,916 302 94 — 15,432 
Other segment expenses1
5,602 6,883 3,295 741 2,126 18,647 
Depreciation and amortization16,819 10,039 8,697 2,389 — 37,944 
(Gain) loss on sale or disposition of property, plant and equipment(1,063)(496)305 (66)— (1,320)
63,402 157,255 22,886 7,704 11,397 262,644 
Operating income (loss)$9,634 $26,450 $12,402 $13,384 $(11,397)$50,473 
Segment assets - as of September 30, 2024$192,058 $166,448 $116,748 $79,503 $— $554,757 
Capital expenditures and plant turnaround costs$11,318 $6,554 $22,826 $2,434 $— $43,132 

1 Other segment expenses include outside services, property taxes, terminalling fees, regulatory expenses, professional fees, communications expenses, and many other less significant expense categories used in operations.

2 These employment expenses include allocated overhead from Martin Resource Management Corporation and exclude those that are part of our manufacturing operations. Payroll expenses in our manufacturing operations are included in cost of products sold.