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INTANGIBLE ASSETS, NET | 12 Months Ended
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Dec. 31, 2022
Intangible Assets, net |
Intangible Assets, net | NOTE 8. INTANGIBLE ASSETS, NET Intangible assets include customer relationships associated with various business and asset acquisitions. These acquired intangible assets were recorded at fair value determined as of the date of acquisition and are being amortized over the period we expect to benefit from the assets. Intangible assets, net is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Gross carrying amount | ​ | $ | 141,462 | ​ | $ | 144,322
Accumulated amortization | ​ |  | (104,385) | ​ |  | (96,435)
Intangible assets, net | ​ | $ | 37,077 | ​ | $ | 47,887
​ Intangible assets are amortized on a straight–line basis with estimated useful lives ranging from 15 to 25 years. Amortization expense was $8.9 million, $11.3 million and $15.6 million during the years ended December 31, 2022, 2021 and 2020, respectively. Estimated amortization expense for each of the subsequent five fiscal years is expected to be as follows: ​
​ | ​ | ​ | ​
2023 | ​ | $ | 6,890
2024 | ​ |  | 5,721
2025 | ​ |  | 3,595
2026 | ​ |  | 3,032
2027 | ​ |  | 2,157
Thereafter | ​ |  | 15,682
Total | ​ | $ | 37,077
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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