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Revenue
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue REVENUE
    The following table disaggregates our revenue by major source:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Terminalling and storage segment
Throughput and storage$22,404 $22,375 $43,953 $44,892 
$22,404 $22,375 $43,953 $44,892 
Transportation segment
Land transportation$38,942 $42,860 $77,621 $85,603 
Inland marine transportation12,678 12,977 24,680 27,300 
Offshore marine transportation2,206 1,839 4,510 3,080 
$53,826 $57,676 $106,811 $115,983 
Sulfur services segment
Sulfur product sales$8,894 $7,521 $18,606 $13,204 
Fertilizer product sales31,161 26,194 65,930 50,715 
Sulfur services 4,073 3,477 8,296 6,954 
$44,128 $37,192 $92,832 $70,873 
Specialty products segment
Natural gas liquids product sales$32,976 $35,435 $75,096 $73,566 
Lubricant product sales27,342 31,853 54,527 60,047 
$60,318 $67,288 $129,623 $133,613 

    Revenue is measured based on a consideration specified in a contract with a customer and excludes amounts collected on behalf of third parties where the Partnership is acting as an agent. The Partnership recognizes revenue when the Partnership satisfies a performance obligation, which typically occurs when the Partnership transfers control over a product to a customer or as the Partnership delivers a service.

    The following is a description of the principal activities - separated by reportable segments - from which the Partnership generates revenue.

Terminalling and Storage Segment

    Revenue is recognized for storage contracts based on the contracted monthly tank fixed fee. For throughput contracts, revenue is recognized based on the volume moved through the Partnership’s terminals at the contracted rate. For storage and throughput contracts at the Partnership's underground NGL storage facility, revenue is recognized based on the volume stored and moved through the facility at the contracted rate. For the Partnership’s tolling agreement, revenue is recognized based on the contracted monthly reservation fee and throughput volumes moved through the facility. Throughput and storage revenue in the table above includes non-cancelable revenue arrangements that are under the scope of ASC 842, whereby the Partnership has committed certain Terminalling and Storage assets in exchange for a minimum fee.

Transportation Segment

    Revenue related to land transportation is recognized for line hauls based on a mileage rate. For contracted trips, revenue is recognized upon completion of the particular trip. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.
    Revenue related to marine transportation is recognized for time charters based on a per day rate. For contracted trips, revenue is recognized upon completion of the particular trip. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

Sulfur Services Segment

    Revenue from sulfur and fertilizer product sales is recognized when the customer takes title to the product. Delivery of product is invoiced as the transaction occurs and is generally paid within a month. Revenue from sulfur services is recognized as services are performed during each monthly period. The performance of the service is invoiced as the transaction occurs and is generally paid within a month.

Specialty Products Segment

    NGL revenue is recognized when title is transferred, which is generally when the product is delivered by truck, rail, or pipeline to the Partnership's NGL customers or when the customer picks up the product from our facilities. When lubricants are sold by truck or rail, revenue is recognized when title is transferred, which is generally when the product leaves the Partnership's facility, but can vary based on the specific terms of the contract. Delivery of the product is invoiced as the transaction occurs and is generally paid within a month.

    The table below includes estimated minimum revenue expected to be recognized in the future related to performance obligations that are unsatisfied at the end of the reporting period. The Partnership applies the practical expedient in ASC 606-10-50-14(a) and does not disclose information about remaining performance obligations that have original expected durations of one year or less.
20252026202720282029ThereafterTotal
Terminalling and storage
Throughput and storage$22,475 $46,117 $47,500 $48,990 $50,393 $105,367 $320,842 
Sulfur services
Product sales7,118 14,237 14,237 — — — 35,592 
Service revenues5,174 9,374 3,153 2,655 2,655 39,161 62,172 
Specialty Products
NGL product sales3,404 3,934 — — — — 7,338 
Total$38,171 $73,662 $64,890 $51,645 $53,048 $144,528 $425,944 
In addition, the Partnership has non-cancelable revenue arrangements that are under the scope of ASC 842 whereby we have committed certain terminalling and storage assets in exchange for a minimum fee. Future minimum revenues the Partnership expects to receive under these non-cancelable arrangements as of June 30, 2025, are as follows: 2025 - $13,069; 2026 - $16,053; 2027 - $12,987; 2028 - $12,213; 2029 - $9,909; subsequent years - $8,587.