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Intangibles | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangibles | Intangible assets Intangible assets other than goodwill were comprised of the following:
| December 31,
| 2020 |  | 2019
Indefinite-lived licenses | $ | 100,138 |  |  | $ | 90,209 |
Noncompetition agreements | 84,022 |  |  | 103,510 |
Customer relationships and other | 52,566 |  |  | 23,887 |
| 236,726 |  |  | 217,606 |
Less accumulated amortization | (70,141) |  |  | (81,922) |
| $ | 166,585 |  |  | $ | 135,684 |
Noncompetition agreements are generally amortized over three years to 10 years and customer relationships are principally amortized over 10 years to 20 years. Amortization expense from amortizable intangible assets was $13,809, $14,247, and $16,236 for 2020, 2019 and 2018, respectively. For the years ended December 31, 2020, 2019 and 2018, the Company recognized no impairment charges on any intangible assets other than the goodwill impairment charges discussed in Note 10. Scheduled amortization expenses from amortizable intangible assets as of December 31, 2020 were as follows:
| Noncompetition agreements |  | Customer relationships and other
2021 | $ | 10,274 |  |  | $ | 3,143 |
2022 | 6,680 |  |  | 3,139 |
2023 | 3,883 |  |  | 3,102 |
2024 | 1,714 |  |  | 2,851 |
2025 | 585 |  |  | 2,660 |
Thereafter | 168 |  |  | 28,248 |
Total | $ | 23,304 |  |  | $ | 43,143 |

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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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