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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Concentration Risk [Line Items] |
Schedule of credit loss allowance included in accounts receivable | The following table presents changes in the credit loss allowance for the years ended December 31 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ | ​ ​ ​ | ​ | ​ | ​ ​ ​ | Write-offs | ​ ​ ​ | ​ | ​ | ​ ​ ​ | ​ | ​ |
​ | ​ | Balance at | ​ | Current | ​ | Charged | ​ | ​ | ​ | ​ | Balance | ​
​ | ​ | Beginning | ​ | Period | ​ | Against Allowance | ​ | Recoveries | ​ | at End |
Description | ​ | of Period | ​ | Provision | ​ | for Credit Losses | ​ | Collected | ​ | of Period |
Year ended December 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit loss allowance—accounts receivable | ​ | $ | 3,132 | ​ | $ | 1,063 | ​ | $ | (256) | ​ | $ | 235 | ​ | $ | 4,174 | ​
Year ended December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit loss allowance—accounts receivable | ​ | $ | 3,360 | ​ | $ | 221 | ​ | $ | (496) | ​ | $ | 47 | ​ | $ | 3,132 | ​
Year ended December 31, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Credit loss allowance—accounts receivable | ​ | $ | 3,062 | ​ | $ | 358 | ​ | $ | (63) | ​ | $ | 3 | ​ | $ | 3,360 | ​
Schedule of inventories | Inventories consisted of the following at December 31 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​
Distillates: home heating oil, diesel and kerosene | ​ | $ | 201,496 | ​ | $ | 234,486 | ​
Gasoline | ​ |  | 181,135 | ​ |  | 222,092 | ​
Gasoline blendstocks | ​ |  | 58,117 | ​ |  | 50,870 | ​
Residual oil | ​ |  | 77,449 | ​ |  | 55,908 | ​
Renewable identification numbers (RINs) | ​ |  | 1,614 | ​ |  | 3,313 | ​
Convenience store inventory | ​ |  | 29,307 | ​ |  | 27,403 | ​
Total | ​ | $ | 549,118 | ​ | $ | 594,072 | ​
Schedule of estimated useful lives of property and equipment | The estimated useful lives are as follows:
​ | ​ | ​ | ​ | ​
Gasoline station buildings, improvements and storage tanks | ​ ​ ​ | 15-25 | years | ​
Buildings, docks, terminal facilities and improvements |  | 5-25 | years | ​
Gasoline station equipment |  | 7 | years | ​
Fixtures, equipment and capitalized internal use software |  | 3-7 | years | ​
Schedule of original contracted terms for operating leases | The Partnership’s leases have contracted terms as follows:
​ | ​ | ​ | ​ | ​
Gasoline station and convenience store leases | ​ ​ ​ | 1-20 | years | ​
Terminal lease arrangements |  | 1-20 | years | ​
Dedicated storage facility leases | ​ | 10 | years | ​
Barge and railcar equipment leases | ​ | 1-5 | years | ​
Office space leases |  | 1-12 | years | ​
Computer equipment, convenience store equipment and automobile leases |  | 1-10 | years | ​
Revenue Benchmark [Member] |
Concentration Risk [Line Items] |
Schedule of concentration of risk as percentage of consolidated amount | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023 |
Gasoline sales: gasoline and gasoline blendstocks (such as ethanol) |  | 65 | % | 67 | % | 68 | %
Distillates (home heating oil, diesel and kerosene), residual oil and crude oil sales |  | 32 | % | 30 | % | 28 | %
Convenience store and prepared food sales, rental income and sundries | ​ | 3 | % | 3 | % | 4 | %
Total |  | 100 | % | 100 | % | 100 | %
Product Margin |
Concentration Risk [Line Items] |
Schedule of concentration of risk as percentage of consolidated amount | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024 | ​ ​ ​ | 2023 |
Wholesale segment |  | 27 | % | 25 | % | 19 | %
Gasoline Distribution and Station Operations segment |  | 71 | % | 73 | % | 78 | %
Commercial segment | ​ | 2 | % | 2 | % | 3 | %
Total |  | 100 | % | 100 | % | 100 | %

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