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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2025
Goodwill. |
Goodwill and Intangible Assets | Note 6. Goodwill and Intangible Assets Goodwill, all of which has been allocated to the GDSO segment, was $421.9 million at both December 31, 2025 and 2024. There were no changes to goodwill during the year ended December 31, 2025. Intangible assets consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gross | ​ | ​ | ​ | ​ | Net | ​ | ​ | ​
​ | ​ | Carrying | ​ | Accumulated | ​ | Intangible | ​ | Amortization | ​
​ | ​ | Amount | ​ | Amortization | ​ | Assets | ​ | Period | ​
At December 31, 2025 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Terminalling services | ​ | $ | 26,365 | ​ | $ | (24,443) | ​ | $ | 1,922 |  | 20 years | ​
Customer relationships | ​ |  | 52,226 | ​ |  | (45,906) | ​ |  | 6,320 |  | 2-15 years | ​
Supply contracts | ​ |  | 97,269 | ​ |  | (92,430) | ​ |  | 4,839 |  | 5-10 years | ​
Other intangible assets | ​ |  | 5,995 | ​ |  | (5,726) | ​ |  | 269 |  | 2-20 years | ​
Total intangible assets | ​ | $ | 181,855 | ​ | $ | (168,505) | ​ | $ | 13,350 | ​ | ​ | ​
At December 31, 2024 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Terminalling services | ​ | $ | 26,365 | ​ | $ | (23,108) | ​ | $ | 3,257 |  | 20 years | ​
Customer relationships | ​ |  | 52,226 | ​ |  | (44,605) | ​ |  | 7,621 |  | 2-15 years | ​
Supply contracts | ​ |  | 97,269 | ​ |  | (89,733) | ​ |  | 7,536 |  | 5-10 years | ​
Other intangible assets | ​ |  | 5,995 | ​ |  | (5,726) | ​ |  | 269 |  | 2-20 years | ​
Total intangible assets | ​ | $ | 181,855 | ​ | $ | (163,172) | ​ | $ | 18,683 | ​ | ​ | ​
​ The aggregate amortization expense was $5.3 million, $8.3 million and $8.1 million for the years ended December 31, 2025, 2024 and 2023, respectively. The estimated annual intangible asset amortization expense for future years ending December 31 is as follows (in thousands):
​ | ​ | ​ | ​ | ​
2026 | ​ ​ ​ | $ | 5,151 | ​
2027 | ​ |  | 3,650 | ​
2028 | ​ |  | 921 | ​
2029 | ​ |  | 720 | ​
2030 | ​ |  | 680 | ​
Thereafter | ​ |  | 2,228 | ​
Total intangible assets | ​ | $ | 13,350 | ​
​

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