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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of changes to the carrying amount of goodwill by reporting unit
The table below presents changes to the carrying amount of goodwill by segment during the nine months ended September 30, 2022 (in thousands).
 ResearchConferencesConsultingTotal
Balance at December 31, 2021 (1)$2,670,934 $184,021 $96,362 $2,951,317 
Foreign currency translation impact (12,751)(148)(2,278)(15,177)
Balance at September 30, 2022 (1)$2,658,183 $183,873 $94,084 $2,936,140 
(1)The Company does not have any accumulated goodwill impairment losses.
Schedule of amortizable intangible assets
The tables below present reconciliations of the carrying amounts of the Company’s finite-lived intangible assets as of the dates indicated (in thousands).
September 30, 2022Customer
Relationships		Technology-relatedOtherTotal
Gross cost at December 31, 2021$1,096,358 $61,216 $10,436 $1,168,010 
Foreign currency translation impact (60,366)(888)— (61,254)
Gross cost1,035,992 60,328 10,436 1,106,756 
Accumulated amortization (1)(454,382)(43,189)(5,352)(502,923)
Balance at September 30, 2022$581,610 $17,139 $5,084 $603,833 
December 31, 2021Customer
Relationships		Technology-relatedOther Total
Gross cost $1,096,358 $61,216 $10,436 $1,168,010 
Accumulated amortization (1)(413,266)(35,727)(4,599)(453,592)
Balance at December 31, 2021$683,092 $25,489 $5,837 $714,418 
(1) Finite-lived intangible assets are amortized using the straight-line method over the following periods: Customer relationships—6 to 13 years; Technology-related—3 to 7 years; and Other—4 to 11 years.
Schedule of estimated future amortization expense by year The estimated future amortization expense by year for finite-lived intangible assets is presented in the table below (in thousands).
2022 (remaining three months)$23,979 
202395,901 
202488,802 
202578,302 
202675,628 
Thereafter241,221 
$603,833