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Business Segments
 3 Months Ended
Mar. 31, 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 months ended March 31, 2025 and 2024.
Terminalling and StorageTransportationSulfur ServicesSpecialty ProductsIndirect selling, general and administrativeTotal
Three Months Ended March 31, 2025:
Operating revenues from external customers$21,549 $52,985 $48,704 $69,305 $— $192,543 
Intersegment operating revenues 1,865 4,490 — 23 — 6,378 
Total segment revenues23,414 57,475 48,704 69,328 — 198,921 
Reconciliation of revenues:
Elimination of intersegment revenues(1,865)(4,490)— (23)— (6,378)
Total consolidated revenues21,549 52,985 48,704 69,305 — 192,543 
Less: cost of products sold:
Direct product costs— — 26,819 57,627 — 84,446 
Manufacturing costs (plant, labor, transportation, and other)— — 5,183 5,418 — 10,601 
Segment gross margin23,414 57,475 16,702 6,283 — 103,874 
Less:
Employment related expenses2
6,552 15,254 2,163 1,452 3,094 28,515 
Driver pay — 12,081 — — — 12,081 
Pass-through expenses— 6,097 864 — — 6,961 
Utilities, materials, and supplies3,634 609 255 27 — 4,525 
Repairs and maintenance1,399 4,494 208 1 — 6,102 
Insurance related expenses1,471 3,950 160 34 89 5,704 
Lease expenses1,156 4,636 125 22 — 5,939 
Other segment expenses1
1,524 2,394 1,654 244 1,492 7,308 
Depreciation and amortization5,569 2,932 3,557 758 — 12,816 
(Gain) loss on sale or disposition of property, plant and equipment(1)(478)— — — (479)
21,304 51,969 8,986 2,538 4,675 89,472 
Operating income (loss)$2,110 $5,506 $7,716 $3,745 $(4,675)$14,402 
Segment assets - as of March 31, 2025$166,644 $169,819 $131,702 $65,245 $— $533,410 
Capital expenditures and plant turnaround costs$922 $2,822 $1,741 $123 $— $5,608 
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 March 31, 2024:
Operating revenues from external customers$22,517 $58,307 $33,681 $66,325 $— $180,830 
Intersegment operating revenues 1,768 3,735 — 21 — 5,524 
Total segment revenues24,285 62,042 33,681 66,346 — 186,354 
Reconciliation of revenues:
Elimination of intersegment revenues(1,768)(3,735)— (21)— (5,524)
Total consolidated revenues22,517 58,307 33,681 66,325 — 180,830 
— 
Less: cost of products sold:
Direct product costs— — 18,444 54,185 — 72,629 
Manufacturing costs (plant, labor, transportation, and other)18 — 4,326 5,459 — 9,803 
Segment gross margin24,267 62,042 10,911 6,702 — 103,922 
Less:
Employment related expenses2
5,580 14,741 1,835 1,021 3,130 26,307 
Driver pay — 12,698 — — — 12,698 
Pass-through expenses— 7,173 697 — — 7,870 
Utilities, materials, and supplies4,067 512 209 31 — 4,819 
Repairs and maintenance1,387 4,460 141 3 — 5,991 
Insurance related expenses1,496 3,195 171 26 — 4,888 
Lease expenses966 3,872 87 38 — 4,963 
Other segment expenses1
1,821 2,189 1,104 229 706 6,049 
Depreciation and amortization5,395 3,476 2,982 796 — 12,649 
(Gain) loss on sale or disposition of property, plant and equipment(102)(105)— — — (207)
20,610 52,211 7,226 2,144 3,836 86,027 
Operating income (loss)$3,657 $9,831 $3,685 $4,558 $(3,836)$17,895 
Segment assets - as of March 31, 2024$171,078 $158,127 $107,519 $75,353 $— $512,077 
Capital expenditures and plant turnaround costs$7,050 $2,855 $6,336 $1,152 $— $17,393 
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.