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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Intangible Assets and GoodwillAll intangible assets determined to have finite lives are amortized over their estimated useful lives. The useful life of an intangible asset is the period over which the asset is expected to contribute directly or indirectly to future cash flows. There was no change in the gross amount of identifiable intangible assets during the twelve months ended December 31, 2021. Amortization expense of $2.4 million, $2.4 million and $2.7 million for the twelve months ended December 31, 2021, 2020 and 2019, respectively, was included in depreciation and amortization in the consolidated statements of comprehensive income. Intangible assets subject to amortization consisted of the following at December 31, 2021 and 2020:
| 2021
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands)
Customer relationships | 15-20 |  | $ | 23,000 |  |  | $ | 5,842 |  |  | $ | 17,158 |
Tradename | 0.5-10 |  | 12,900 |  |  | 9,220 |  |  | 3,680 |
Covenants not to compete | 1-10 |  | 5,300 |  |  | 3,783 |  |  | 1,517 |
|  |  | $ | 41,200 |  |  | $ | 18,845 |  |  | $ | 22,355 |
| 2020
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands)
Customer relationships | 15-20 |  | $ | 23,000 |  |  | $ | 4,531 |  |  | $ | 18,469 |
Tradename | 0.5-10 |  | 12,900 |  |  | 8,740 |  |  | 4,160 |
Covenants not to compete | 1-10 |  | 5,300 |  |  | 3,183 |  |  | 2,117 |
|  |  | $ | 41,200 |  |  | $ | 16,454 |  |  | $ | 24,746 |
Future amortization expense for intangible assets is estimated at $2.3 million for 2022, $2.2 million for 2023, $1.9 million for 2024, $1.9 million for 2025, and $1.9 million for 2026. There were no changes in the carrying amount of goodwill during the twelve months ended December 31, 2021 and 2020.

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- Definition The entire disclosure for goodwill and 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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