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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets At December 31, 2021 and 2020, intangible assets consisted of the following, respectively (in thousands):
| December 31, 2021
| Gross carrying amount |  | Accumulated amortization |  | Net intangibles |  | Amortization period (in years)
Customer relationships | $ | 269,589 |  |  | $ | (133,451) |  |  | $ | 136,138 |  |  | 10 - 15
Patents and technology | 89,449 |  |  | (29,785) |  |  | 59,664 |  |  | 5 - 19
Non-compete agreements | 191 |  |  | (173) |  |  | 18 |  |  | 2 - 6
Trade names | 43,125 |  |  | (25,187) |  |  | 17,938 |  |  | 7 - 19
Trademark | 5,089 |  |  | (1,442) |  |  | 3,647 |  |  | 15
Intangible Assets Total | $ | 407,443 |  |  | $ | (190,038) |  |  | $ | 217,405 |  |  |
| December 31, 2020
| Gross carrying amount |  | Accumulated amortization |  | Net intangibles |  | Amortization period (in years)
Customer relationships | $ | 272,470 |  |  | $ | (121,294) |  |  | $ | 151,176 |  |  | 10 - 15
Patents and technology | 89,626 |  |  | (24,440) |  |  | 65,186 |  |  | 5 - 19
Non-compete agreements | 190 |  |  | (137) |  |  | 53 |  |  | 2 - 6
Trade names | 42,984 |  |  | (22,941) |  |  | 20,043 |  |  | 7 - 19
Trademark | 5,089 |  |  | (1,103) |  |  | 3,986 |  |  | 15
Intangible Assets Total | $ | 410,359 |  |  | $ | (169,915) |  |  | $ | 240,444 |  |  |
Intangible assets with definite lives are tested for impairment whenever events or changes in circumstances indicate that their carrying amount may not be recoverable. For the year ended December 31, 2021, we did not recognize any intangible asset impairment charges. For the year ended December 31, 2020, we recognized intangible asset impairment charges totaling $5.3 million, which are included in “Impairments of intangible assets, property and equipment” in the consolidated statements of comprehensive loss. See Note 8 Impairments of Long-Lived Assets for further information related to these charges. Amortization expense was $25.1 million and $26.5 million for the years ended December 31, 2021 and 2020, respectively. The estimated future amortization expense for the next five years is as follows (in thousands):
Year ending December 31, |  | Amount
2022 |  | $ | 25,161 |
2023 |  | 24,200 |
2024 |  | 22,881 |
2025 |  | 21,694 |
2026 |  | 20,837 |

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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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