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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The carrying amount of Intangible Assets for the years ended December 31, 2022 and 2021 is as follows:
December 31, 2022December 31, 2021
Cost(in thousands)
Customer relationships$4,076,435 $4,056,642 
Order backlog536,934 528,022 
Trade names & brands204,621 204,685 
Patient database170,238 170,525 
Technology assets120,984 121,507 
Total cost5,109,212 5,081,381 
Accumulated amortization(830,553)(370,538)
 
Net book value
$4,278,659 $4,710,843 
On July 1, 2021, ICON plc announced the completion of its Merger with PRA Health Sciences, Inc. The Merger resulted in the recognition of Customer relationships of $3,938.0 million, Order backlog of $500.0 million, Trade names of $202.0 million, Patient database of $168.0 million and Technology assets of $111.0 million. These assets will be amortized over their expected useful lives of between 3 and 23 years. The valuation of these assets were finalized in June 30, 2022. In total, $677.1 million has been amortized in the period since the date of acquisition, $453.6 million has been amortized in the year ended December 31, 2022.

Future intangible asset amortization expense for the years ended December 31, 2023 to December 31, 2027 is as follows:
 Year Ended
December 31, 2022
(in thousands)
2023$460,711 
2024339,940 
2025223,674 
2026209,681 
2027198,300 
 $1,432,306