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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 740,743 | $ 683,083 | $ 588,213
Intangibles : |  |  |
Total intangibles | 260,876 | 218,328 |
Total goodwill and other intangibles assets | 1,001,619 | 901,411 |
Accumulated amortization: |  |  |
Total accumulated amortization | (160,836) | (144,661) |
Goodwill and other intangible assets, net | 840,783 | 756,750 |
Client lists |  |  |
Intangibles : |  |  |
Total intangibles | 249,422 | 207,084 |
Accumulated amortization: |  |  |
Total accumulated amortization | (152,326) | (137,284) |
Other intangibles |  |  |
Intangibles : |  |  |
Total intangibles | 11,454 | 11,244 |
Accumulated amortization: |  |  |
Total accumulated amortization | $ (8,510) | $ (7,377) |

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