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Derivative Instruments and Hedging Activities (Tables) | 6 Months Ended
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Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of commodity derivative activity | Commodity swaps and embedded derivatives as of December 31, 2023 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross Amounts | ​ | Gross Amounts | ​ | Net Amount
​ |  | Recognized |  | Offset |  | Presented
Assets: |  | ​ |  |  | ​ |  |  | ​ |
Fueling agreements: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaid expenses and other current assets | ​ | $ | 2,593 | ​ | $ | — | ​ | $ | 2,593
Notes receivable and other long-term assets, net | ​ | ​ | 2,035 | ​ | ​ | — | ​ | ​ | 2,035
Total derivative assets | ​ | $ | 4,628 | ​ | $ | — | ​ | $ | 4,628
Liabilities: |  | ​ |  |  | ​ |  |  | ​ |
Commodity swaps: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current portion of derivative liabilities, related party | ​ | $ | 1,875 | ​ | $ | — | ​ | $ | 1,875
Total derivative liabilities | ​ | $ | 1,875 | ​ | $ | — | ​ | $ | 1,875
​ Embedded derivatives as of June 30, 2024 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross Amounts | ​ | Gross Amounts | ​ | Net Amount
​ |  | Recognized |  | Offset |  | Presented
Assets: |  | ​ |  |  | ​ |  |  | ​ |
Fueling agreements: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Prepaid expenses and other current assets | ​ | $ | 2,656 | ​ | $ | — | ​ | $ | 2,656
Notes receivable and other long-term assets, net | ​ | ​ | 1,780 | ​ | ​ | — | ​ | ​ | 1,780
Total derivative assets | ​ | $ | 4,436 | ​ | $ | — | ​ | $ | 4,436
Schedule of weighted-average price of open commodity swap contract | The following table reflects the weighted-average price of open commodity swap contracts as of December 31, 2023 and June 30, 2024, by year with associated volumes: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 | ​ | June 30, 2024
​ | ​ | Volumes | ​ | Weighted-Average Price per | ​ | Volumes | ​ | Weighted-Average Price per
Year |  | (Diesel Gallons) |  | Diesel Gallon |  | (Diesel Gallons) |  | Diesel Gallon
2024 |  | 1,875,000 | ​ | $ | 3.18 | ​ | — | ​ | $ | —
​

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