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Intangible assets | 6 Months Ended
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Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets | Intangible assets The carrying amount of Intangible Assets for the periods ended June 30, 2024 and December 31, 2023 is as follows:
| June 30, 2024 | December 31, 2023
| (in thousands)
Cost |  |
Customer relationships | $ | 4,089,261 |  | $ | 4,090,393 |
Order backlog | 540,795 |  | 541,302 |
Trade names & brands | 204,621 |  | 204,653 |
Patient database | 170,348 |  | 170,366 |
Technology assets | 150,933 |  | 141,257 |
Total cost | 5,155,958 |  | 5,147,971 |
Accumulated amortization | (1,523,604) |  | (1,292,106) |
Net book value | $ | 3,632,354 |  | $ | 3,855,865 |
In the six months ended June 30, 2024, the amortization expense recognized by the Company was $233.0 million (year ended December 31, 2023: $459.9 million). On January 9, 2024, the Company acquired HumanFirst. The acquisition resulted in the recognition of a developed technology intangible asset of $9.9 million. Refer to note 5. Goodwill for further details. The identifiable intangible assets are amortized over their estimated useful lives.

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