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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2019
Intangible Assets, Net [Abstract] |
Intangible Assets, Net | 8.INTANGIBLE ASSETS, NET Intangible assets, exclusive of goodwill, consisted of the following at September 30, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 487,001 | ​ | $ | (183,121) | ​ | $ | — | ​ | $ | 303,880
Customer lists | ​ |  | 561,642 | ​ |  | (288,732) | ​ |  | — | ​ |  | 272,910
Permits and other | ​ |  | 358,314 | ​ |  | (60,290) | ​ |  | — | ​ |  | 298,024
​ | ​ |  | 1,406,957 | ​ |  | (532,143) | ​ |  | — | ​ |  | 874,814
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 | ​ | $ | 1,667,686 | ​ | $ | (532,143) | ​ | $ | (38,507) | ​ | $ | 1,097,036
​ The weighted-average amortization period of long-term franchise agreements and contracts acquired during the nine months ended September 30, 2019 was 19.2 years. The weighted-average amortization period of customer lists acquired during the nine months ended September 30, 2019 was 10.0 years. The weighted-average amortization period of finite-lived permits and other intangibles acquired during the nine months ended September 30, 2019 was 36.8 years. Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2018: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | ​ | ​ |  | Accumulated |  | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Impairment | ​ | Carrying
​ | ​ | Amount | ​ | Amortization | ​ | Loss | ​ | Amount
Finite-lived intangible assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Long-term franchise agreements and contracts | ​ | $ | 476,833 | ​ | $ | (157,986) | ​ | $ | — | ​ | $ | 318,847
Customer lists | ​ |  | 530,614 | ​ |  | (232,461) | ​ |  | — | ​ |  | 298,153
Permits and other | ​ |  | 338,601 | ​ |  | (49,195) | ​ |  | — | ​ |  | 289,406
​ | ​ |  | 1,346,048 | ​ |  | (439,642) | ​ |  | — | ​ |  | 906,406
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 | ​ | $ | 1,606,777 | ​ | $ | (439,642) | ​ | $ | (38,507) | ​ | $ | 1,128,628
​ Estimated future amortization expense for the next five years relating to finite-lived intangible assets is as follows: ​
​ | ​ | ​ | ​
For the year ending December 31, 2019 |  | $ | 125,699
For the year ending December 31, 2020 | ​ | $ | 113,177
For the year ending December 31, 2021 | ​ | $ | 98,310
For the year ending December 31, 2022 | ​ | $ | 84,543
For the year ending December 31, 2023 | ​ | $ | 71,283
​

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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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