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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Other intangible assets |  |  |  |  |
Gross carrying amount | $ 258,190 |  | $ 258,190 |  | $ 258,554
Accumulated amortization | (121,606) |  | (121,606) |  | (95,962)
Net carrying amount | 136,584 |  | 136,584 |  | 162,592
Amortization expense | 8,543 | $ 9,560 | 26,675 | $ 17,232 |
Estimated amortization expense for other intangibles for each of the next five quarters |  |  |  |  |
December 31, 2021 | 8,201 |  | 8,201 |  |
March 31, 2022 | 7,931 |  | 7,931 |  |
June 30, 2022 | 7,666 |  | 7,666 |  |
September 30, 2022 | 7,230 |  | 7,230 |  |
December 31, 2022 | 7,229 |  | 7,229 |  |
Thereafter | 98,327 |  | 98,327 |  |
Net carrying amount | $ 136,584 |  | $ 136,584 |  | $ 162,592
Minimum |  |  |  |  |
Other intangible assets |  |  |  |  |
Estimated useful lives |  |  | 2 years |  |
Maximum |  |  |  |  |
Other intangible assets |  |  |  |  |
Estimated useful lives |  |  | 15 years |  |

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