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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2023
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 six months ended June 30, 2023 (in thousands).
| Research |  | Conferences |  | Consulting |  | Total
Balance at December 31, 2022 (1) | $ | 2,651,193 |  |  | $ | 183,951 |  |  | $ | 95,067 |  |  | $ | 2,930,211 |
Foreign currency translation impact | 1,033 |  |  | 22 |  |  | 555 |  |  | 1,610 |
Balance at June 30, 2023 (1) | $ | 2,652,226 |  |  | $ | 183,973 |  |  | $ | 95,622 |  |  | $ | 2,931,821 |
(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).
June 30, 2023 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost at December 31, 2022 |  | $ | 1,060,541 |  |  | $ | 11,200 |  |  |  |  | $ | 10,436 |  |  | $ | 1,082,177 |
Intangible assets fully amortized |  | — |  |  | (632) |  |  |  |  | — |  |  | (632) |
Foreign currency translation impact |  | 16,292 |  |  | 38 |  |  |  |  | — |  |  | 16,330 |
Gross cost |  | 1,076,833 |  |  | 10,606 |  |  |  |  | 10,436 |  |  | 1,097,875 |
Accumulated amortization (1) |  | (537,103) |  |  | (6,873) |  |  |  |  | (6,105) |  |  | (550,081) |
Balance at June 30, 2023 |  | $ | 539,730 |  |  | $ | 3,733 |  |  |  |  | $ | 4,331 |  |  | $ | 547,794 |
December 31, 2022 |  | Customer Relationships |  | Technology-related |  |  |  | Other |  | Total
Gross cost |  | $ | 1,060,541 |  |  | 11,200 |  |  |  |  | $ | 10,436 |  |  | $ | 1,082,177 |
Accumulated amortization (1) |  | (486,260) |  |  | (5,600) |  |  |  |  | (5,603) |  |  | (497,463) |
Balance at December 31, 2022 |  | $ | 574,281 |  |  | $ | 5,600 |  |  |  |  | $ | 4,833 |  |  | $ | 584,714 |
(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—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).
2023 (remaining six months) | $ | 46,004 |
2024 | 90,111 |
2025 | 81,444 |
2026 | 78,769 |
2027 | 78,161 |
Thereafter | 173,305 |
| $ | 547,794 |

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