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Intangible Assets, Net | 6 Months Ended
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Jun. 30, 2024
Intangible Assets, Net |
Intangible Assets, Net | Note 9. Intangible Assets, Net The following table summarizes intangible assets, net as of June 30, 2024 and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024
​ | ​ | ​ | ​ | Accumulated | ​ | ​
(Thousands) |  | Cost |  | Amortization |  | Net
Customer relationships | ​ | $ | 148,648 | ​ | $ | (30,342) | ​ | $ | 118,306
Favorable lease asset | ​ | ​ | 790 | ​ | ​ | (548) | ​ | ​ | 242
Software | ​ | ​ | 1,179 | ​ | ​ | (774) | ​ | ​ | 405
Intangible assets, net | ​ | $ | 150,617 | ​ | $ | (31,664) | ​ | $ | 118,953
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | Accumulated | ​ | ​
(Thousands) |  | Cost |  | Amortization |  | Net
Customer relationships | ​ | $ | 148,648 | ​ | $ | (26,487) | ​ | $ | 122,161
Favorable lease asset | ​ | ​ | 790 | ​ | ​ | (413) | ​ | ​ | 377
Software | ​ | ​ | 1,079 | ​ | ​ | (672) | ​ | ​ | 407
Intangible assets, net | ​ | $ | 150,517 | ​ | $ | (27,572) | ​ | $ | 122,945
​ Amortization expense of intangible assets was $2.1 million and $4.1 million for the three and six months ended June 30, 2024, respectively, and amortization expense of intangible assets was $2.0 million and $4.0 million for the three and six months ended June 30, 2023, respectively. As of June 30, 2024, the weighted average useful life for definite-lived intangibles is approximately 20 years.

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