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Intangible assets | 12 Months Ended
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Dec. 31, 2021
Intangible assets |
Intangible Assets | 18. Intangible assets ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ |
As 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 | ​
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​ | ​
As at December 31, 2020 | ​ | Cost | ​ | amortization | ​ | Net book value | ​
Trade names and trademarks | ​ | $ | 53,871 | ​ | $ | (1,595) | ​ | $ | 52,276 | ​
Customer relationships | ​ |  | 196,407 | ​ |  | (47,752) | ​ |  | 148,655 | ​
Software and technology assets | ​ |  | 206,829 | ​ |  | (108,127) | ​ |  | 98,702 | ​
Software under development | ​ |  | 1,315 | ​ |  | — | ​ |  | 1,315 | ​
Backlog | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
​ | ​ | $ | 458,422 | ​ | $ | (157,474) | ​ | $ | 300,948 | ​
​ At December 31, 2021, a net carrying amount of $55,613,000 (December 31, 2020: $51,864,000) included in intangible assets was not subject to amortization. During the year ended December 31, 2021, the cost of additions was reduced by $2,224,000 for recognition of tax credits (2020: $2,639,000; 2019: $1,022,000). During the year ended December 31, 2021, interest of $291,000 (2020: $299,000; 2019: $402,000) was capitalized to the cost of software under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 2.48% (2020: 3.04%; 2019: 4.01%). During the year ended December 31, 2021, the weighted average amortization period for all classes of intangible assets was 9.0 years (2020: 9.1; 2019: 7.8). As at December 31, 2021, estimated annual amortization expense for the next five years ended December 31 are as follows: ​
​ | ​ | ​ | ​
2022 |  | $ | 56,583
2023 | ​ |  | 44,659
2024 | ​ |  | 29,222
2025 | ​ |  | 19,505
2026 | ​ |  | 16,481
​ | ​ | $ | 166,450
​

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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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