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Intangible Assets | 12 Months Ended
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Dec. 31, 2022
Intangible Assets |
Intangible Assets | 19. Intangible Assets ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ |
At December 31, 2022 | ​ | Cost | ​ | amortization | ​ | Net book value |
Trade names and trademarks | ​ | $ | 54,023 | ​ | $ | (2,889) | ​ | $ | 51,134 | ​
Customer relationships | ​ |  | 245,407 | ​ |  | (85,657) | ​ |  | 159,750 | ​
Software and technology assets | ​ |  | 289,078 | ​ |  | (182,303) | ​ |  | 106,775 | ​
Software under development | ​ |  | 4,535 | ​ |  | — | ​ |  | 4,535 | ​
Backlog | ​ | ​ | 1,100 | ​ | ​ | (642) | ​ | ​ | 458 | ​
​ | ​ | $ | 594,143 | ​ | $ | (271,491) | ​ | $ | 322,652 | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ | ​
At December 31, 2021 | ​ | Cost | ​ | amortization | ​ | Net book value | ​
Trade names and trademarks | ​ | $ | 54,400 | ​ | $ | (2,147) | ​ | $ | 52,253 | ​
Customer relationships | ​ |  | 245,984 | ​ |  | (65,480) | ​ |  | 180,504 | ​
Software and technology assets | ​ |  | 255,636 | ​ |  | (144,309) | ​ |  | 111,327 | ​
Software under development | ​ |  | 5,424 | ​ |  | — | ​ |  | 5,424 | ​
Backlog | ​ | ​ | 1,100 | ​ | ​ | (92) | ​ | ​ | 1,008 | ​
​ | ​ | $ | 562,544 | ​ | $ | (212,028) | ​ | $ | 350,516 | ​
​ At December 31, 2022, a net carrying amount of $54.5 million (December 31, 2021: $55.6 million) included in intangible assets was not subject to amortization. During the year ended December 31, 2022, the cost of additions was reduced by $1.1 million for recognition of tax credits (2021: $2.2 million; 2020: $2.6 million). During the year ended December 31, 2022, interest of $0.4 million (2021: $0.3 million; 2020: $0.3 million) was capitalized to the cost of software under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 4.82% (2021: 2.48%; 2020: 3.04%). During the year ended December 31, 2022, the weighted average amortization period for all classes of intangible assets was 8.6 years (2021: 9.0; 2020: 9.1). At December 31, 2022, estimated annual amortization expense for the next five years ended December 31 are as follows: ​
​ | ​ | ​ | ​
2023 |  | $ | 55,829
2024 | ​ |  | 41,016
2025 | ​ |  | 24,661
2026 | ​ |  | 20,672
2027 | ​ |  | 18,590
​ | ​ | $ | 160,768
​

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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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