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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2024
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 three months ended March 31, 2024 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2023 (1) | $ | 2,657,549 |  |  | $ | 183,997 |  |  | $ | 95,714 |  |  | $ | 2,937,260 |
Foreign currency translation impact | (2,634) |  |  | (34) |  |  | (194) |  |  | (2,862) |
Balance at March 31, 2024 (1) | $ | 2,654,915 |  |  | $ | 183,963 |  |  | $ | 95,520 |  |  | $ | 2,934,398 |
(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).
March 31, 2024 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost at December 31, 2023 |  | $ | 1,077,183 |  |  | $ | 11,200 |  |  |  |  | $ | 10,200 |  |  | $ | 1,098,583 |
Foreign currency translation impact |  | (2,699) |  |  | — |  |  |  |  | — |  |  | (2,699) |
Gross cost |  | 1,074,484 |  |  | 11,200 |  |  |  |  | 10,200 |  |  | 1,095,884 |
Accumulated amortization (1) |  | (601,317) |  |  | (10,267) |  |  |  |  | (6,599) |  |  | (618,183) |
Balance at March 31, 2024 |  | $ | 473,167 |  |  | $ | 933 |  |  |  |  | $ | 3,601 |  |  | $ | 477,701 |
December 31, 2023 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost |  | $ | 1,077,183 |  |  | 11,200 |  |  |  |  | $ | 10,200 |  |  | $ | 1,098,583 |
Accumulated amortization (1) |  | (580,937) |  |  | (9,333) |  |  |  |  | (6,355) |  |  | (596,625) |
Balance at December 31, 2023 |  | $ | 496,246 |  |  | $ | 1,867 |  |  |  |  | $ | 3,845 |  |  | $ | 501,958 |
(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 years; and Other—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).
2024 (remaining nine months) | $ | 66,973 |
2025 | 81,263 |
2026 | 78,589 |
2027 | 77,980 |
2028 | 76,509 |
Thereafter | 96,387 |
| $ | 477,701 |

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