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Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | 8.INTANGIBLE ASSETS, NET Intangible assets, exclusive of goodwill, consisted of the following at March 31, 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 1,127,530 | ​ | $ | (414,406) | ​ | $ | — | ​ | $ | 713,124
Customer lists | ​ |  | 1,024,163 | ​ |  | (716,336) | ​ |  | — | ​ |  | 307,827
Permits and other | ​ |  | 1,077,247 | ​ |  | (171,763) | ​ |  | (40,784) | ​ |  | 864,700
​ | ​ |  | 3,228,940 | ​ |  | (1,302,505) | ​ |  | (40,784) | ​ |  | 1,885,651
Indefinite-lived intangible assets: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Solid waste collection and transportation permits | ​ |  | 181,613 | ​ |  | — | ​ |  | — | ​ |  | 181,613
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets, exclusive of goodwill | ​ | $ | 3,410,553 | ​ | $ | (1,302,505) | ​ | $ | (40,784) | ​ | $ | 2,067,264
​ The weighted-average amortization period of long-term franchise agreements and contracts acquired during the three months ended March 31, 2025 was 8.5 years. The weighted-average amortization period of customer lists acquired during the three months ended March 31, 2025 was 10.2 years. The weighted-average amortization period of finite-lived permits and other acquired during the three months ended March 31, 2025 was 37.2 years. Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 1,104,585 | ​ | $ | (400,674) | ​ | $ | — | ​ | $ | 703,911
Customer lists | ​ |  | 1,005,355 | ​ |  | (693,594) | ​ |  | — | ​ |  | 311,761
Permits and other | ​ |  | 999,357 | ​ |  | (164,239) | ​ |  | (40,784) | ​ |  | 794,334
​ | ​ |  | 3,109,297 | ​ |  | (1,258,507) | ​ |  | (40,784) | ​ |  | 1,810,006
Indefinite-lived intangible assets: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Solid waste collection and transportation permits | ​ |  | 181,613 | ​ |  | — | ​ |  | — | ​ |  | 181,613
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Intangible assets, exclusive of goodwill | ​ | $ | 3,290,910 | ​ | $ | (1,258,507) | ​ | $ | (40,784) | ​ | $ | 1,991,619
​ Estimated future amortization expense for the next five years relating to finite-lived intangible assets owned as of March 31, 2025 is as follows: ​
​ | ​ | ​ | ​
For the year ending December 31, 2025 |  | $ | 194,886
For the year ending December 31, 2026 | ​ | $ | 172,070
For the year ending December 31, 2027 | ​ | $ | 150,608
For the year ending December 31, 2028 | ​ | $ | 133,744
For the year ending December 31, 2029 | ​ | $ | 120,860
​ ​ ​

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