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Business Segments
 6 Months Ended
Jun. 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 six months ended June 30, 2025 and 2024.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Three Months Ended June 30, 2025
Operating revenues from external customers22,404 53,826 44,128 60,318 — $180,676 
Intersegment operating revenues 1,824 3,875 — 23 — 5,722 
Total segment revenues24,228 57,701 44,128 60,341 — 186,398 
Reconciliation of revenues:
Elimination of intersegment revenues(1,824)(3,875)— (23)— (5,722)
Total consolidated revenues22,404 53,826 44,128 60,318 — 180,676 
Less: cost of products sold:
Direct product costs— — 22,604 50,218 — 72,822 
Manufacturing costs (plant, labor, transportation, and other)— — 6,707 3,948 — 10,655 
Segment gross margin24,228 57,701 14,817 6,175 — 102,921 
Less:
Employment related expenses2
6,584 15,183 2,221 1,431 3,165 28,584 
Driver pay — 11,504 — — — 11,504 
Pass-through expenses— 5,884 777 — — 6,661 
Utilities, materials, and supplies3,587 587 236 31 — 4,441 
Repairs and maintenance905 4,481 215 9 — 5,610 
Insurance related expenses1,560 4,296 179 44 3 6,082 
Lease expenses1,075 4,920 110 31 — 6,136 
Other segment expenses1
2,114 2,313 1,555 244 769 6,995 
Depreciation and amortization5,411 2,916 3,556 755 — 12,638 
(Gain) loss on sale or disposition of property, plant and equipment(8)(600)(1)(4)— (613)
21,228 51,484 8,848 2,541 3,937 88,038 
Operating income (loss)$3,000 $6,217 $5,969 $3,634 $(3,937)$14,883 
Segment assets - as of June 30, 2025$159,001 $162,974 $128,266 $65,391 $— $515,632 
Capital expenditures and plant turnaround costs$1,925 $2,077 $1,587 $426 $— $6,015 

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
Six Months Ended June 30, 2025
Operating revenues from external customers$43,953 $106,811 $92,832 $129,623 $— $373,219 
Intersegment operating revenues 3,689 8,365 — 46 — 12,100 
Total segment revenues47,642 115,176 92,832 129,669 — 385,319 
Reconciliation of revenues:
Elimination of intersegment revenues(3,689)(8,365)— (46)— (12,100)
Total consolidated revenues43,953 106,811 92,832 129,623 — 373,219 
Less: cost of products sold:
Direct product costs— — 49,424 107,845 — 157,269 
Manufacturing costs (plant, labor, transportation, and other)— — 11,889 9,366 — 21,255 
Segment gross margin47,642 115,176 31,519 12,458 — 206,795 
Less:
Employment related expenses2
13,137 30,436 4,384 2,884 6,259 57,100 
Driver pay — 23,585 — — — 23,585 
Pass-through expenses— 11,982 1,641 — — 13,623 
Utilities, materials, and supplies7,220 1,196 491 58 — 8,965 
Repairs and maintenance2,305 8,976 424 10 — 11,715 
Insurance related expenses3,031 8,246 339 77 92 11,785 
Lease expenses2,231 9,555 235 53 — 12,074 
Other segment expenses1
3,637 4,707 3,208 488 2,261 14,301 
Depreciation and amortization10,980 5,848 7,113 1,513 — 25,454 
(Gain) loss on sale or disposition of property, plant and equipment(9)(1,078)(1)(4)— (1,092)
42,532 103,453 17,834 5,079 8,612 177,510 
Operating income (loss)$5,110 $11,723 $13,685 $7,379 $(8,612)$29,285 
Segment assets - as of June 30, 2025$159,001 $162,974 $128,266 $65,391 $— $515,632 
Capital expenditures and plant turnaround costs$2,847 $4,899 $3,328 $549 $— $11,623 

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 June 30, 2024
Operating revenues from external customers$22,375 $57,676 $37,192 $67,288 $— $184,531 
Intersegment operating revenues 2,027 3,791 1 29 — 5,848 
Total segment revenues24,402 61,467 37,193 67,317 — 190,379 
Reconciliation of revenues:
Elimination of intersegment revenues(2,027)(3,791)(1)(29)— (5,848)
Total consolidated revenues22,375 57,676 37,192 67,288 — 184,531 
Less: cost of products sold:
Direct product costs— — 16,735 54,766 — 71,501 
Manufacturing costs (plant, labor, transportation, and other)24 — 5,448 4,945 — 10,417 
Segment gross margin24,378 61,467 15,010 7,606 — 108,461 
Less:
Employment related expenses2
6,465 14,796 2,246 1,517 3,115 28,139 
Driver pay — 13,168 — — — 13,168 
Pass-through expenses— 6,506 633 — — 7,139 
Utilities, materials, and supplies3,073 605 186 32 — 3,896 
Repairs and maintenance1,280 5,041 74 7 — 6,402 
Insurance related expenses2,762 4,239 125 29 — 7,155 
Lease expenses975 3,746 113 28 — 4,862 
Other segment expenses1
1,787 2,209 1,084 255 704 6,039 
Depreciation and amortization5,729 3,381 2,778 799 — 12,687 
(Gain) loss on sale or disposition of property, plant and equipment(995)(260)308 (6)— (953)
21,076 53,431 7,547 2,661 3,819 88,534 
Operating income (loss)$3,302 $8,036 $7,463 $4,945 $(3,819)$19,927 
Segment assets - as of June 30, 2024$179,047 $164,571 $112,644 $78,816 $— $535,078 
Capital expenditures and plant turnaround costs$2,075 $1,770 $8,561 $798 $— $13,204 

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
Six Months Ended June 30, 2024
Operating revenues from external customers$44,892 $115,983 $70,873 $133,613 $— $365,361 
Intersegment operating revenues 3,795 7,526 1 50 — 11,372 
Total segment revenues48,687 123,509 70,874 133,663 — 376,733 
Reconciliation of revenues:
Elimination of intersegment revenues(3,795)(7,526)(1)(50)— (11,372)
Total consolidated revenues44,892 115,983 70,873 133,613 — 365,361 
— 
Less: cost of products sold:
Direct product costs— — 35,179 108,952 — 144,131 
Manufacturing costs (plant, labor, transportation, and other)42 — 9,775 10,403 — 20,220 
Segment gross margin48,645 123,509 25,920 14,308 — 212,382 
Less:
Employment related expenses2
12,045 29,537 4,081 2,538 6,245 54,446 
Driver pay — 25,866 — — — 25,866 
Pass-through expenses— 13,679 1,329 — — 15,008 
Utilities, materials, and supplies7,140 1,118 395 63 — 8,716 
Repairs and maintenance2,667 9,501 215 10 — 12,393 
Insurance related expenses4,258 7,434 295 55 — 12,042 
Lease expenses1,941 7,618 201 66 — 9,826 
Other segment expenses1
3,608 4,398 2,188 484 1,410 12,088 
Depreciation and amortization11,124 6,857 5,760 1,595 — 25,336 
(Gain) loss on sale or disposition of property, plant and equipment(1,097)(366)308 (6)— (1,161)
41,686 105,642 14,772 4,805 7,655 174,560 
Operating income (loss)$6,959 $17,867 $11,148 $9,503 $(7,655)$37,822 
Segment assets - as of June 30, 2024$179,047 $164,571 $112,644 $78,816 $— $535,078 
Capital expenditures and plant turnaround costs$9,125 $4,625 $14,897 $1,950 $— $30,597 

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.