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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Jun. 07, 2020
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 1,581,085 | $ 1,563,942 |
CSFL |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  | $ 562,400 | $ 562,400 | $ 562,370
Goodwill related to the CSFL merger |  | $ 15,800 |  |  |
Goodwill increased | $ 1,300 |  |  |  |

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