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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2020
Intangible Assets, Net [Abstract] |
Intangible Assets, Net | 10.INTANGIBLE ASSETS, NET Intangible assets, exclusive of goodwill, consisted of the following at September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 588,000 | ​ | $ | (220,502) | ​ | $ | — | ​ | $ | 367,498
Customer lists | ​ |  | 594,215 | ​ |  | (360,264) | ​ |  | — | ​ |  | 233,951
Permits and other | ​ |  | 364,263 | ​ |  | (74,120) | ​ |  | — | ​ |  | 290,143
​ | ​ |  | 1,546,478 | ​ |  | (654,886) | ​ |  | — | ​ |  | 891,592
Indefinite-lived intangible assets: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Solid waste collection and transportation permits | ​ |  | 172,056 | ​ |  | — | ​ |  | — | ​ |  | 172,056
Material recycling facility permits | ​ |  | 42,283 | ​ |  | — | ​ |  | — | ​ |  | 42,283
E&P facility permits | ​ |  | 59,855 | ​ |  | — | ​ |  | (38,507) | ​ |  | 21,348
​ | ​ |  | 274,194 | ​ |  | — | ​ |  | (38,507) | ​ |  | 235,687
Intangible assets, exclusive of goodwill | ​ | $ | 1,820,672 | ​ | $ | (654,886) | ​ | $ | (38,507) | ​ | $ | 1,127,279
​ The weighted-average amortization period of long-term franchise agreements and contracts acquired during the nine months ended September 30, 2020 was 14.1 years. The weighted-average amortization period of customer lists acquired during the nine months ended September 30, 2020 was 11.0 years. Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 550,340 | ​ | $ | (192,462) | ​ | $ | — | ​ | $ | 357,878
Customer lists | ​ |  | 587,562 | ​ |  | (308,427) | ​ |  | — | ​ |  | 279,135
Permits and other | ​ |  | 367,127 | ​ |  | (63,299) | ​ |  | — | ​ |  | 303,828
​ | ​ |  | 1,505,029 | ​ |  | (564,188) | ​ |  | — | ​ |  | 940,841
Indefinite-lived intangible assets: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Solid waste collection and transportation permits | ​ |  | 158,591 | ​ |  | — | ​ |  | — | ​ |  | 158,591
Material recycling facility permits | ​ |  | 42,283 | ​ |  | — | ​ |  | — | ​ |  | 42,283
E&P facility permits | ​ |  | 59,855 | ​ |  | — | ​ |  | (38,507) | ​ |  | 21,348
​ | ​ |  | 260,729 | ​ |  | — | ​ |  | (38,507) | ​ |  | 222,222
Intangible assets, exclusive of goodwill | ​ | $ | 1,765,758 | ​ | $ | (564,188) | ​ | $ | (38,507) | ​ | $ | 1,163,063
​ Estimated future amortization expense for the next five years relating to finite-lived intangible assets is as follows: ​
​ | ​ | ​ | ​
For the year ending December 31, 2020 |  | $ | 128,665
For the year ending December 31, 2021 | ​ | $ | 113,928
For the year ending December 31, 2022 | ​ | $ | 98,516
For the year ending December 31, 2023 | ​ | $ | 83,699
For the year ending December 31, 2024 | ​ | $ | 72,100
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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