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Goodwill and Intangible Assets - Carrying Amounts and Useful Lives of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 353,645 | $ 286,448
Accumulated amortization |  | (133,793) | (117,482)
Foreign currency exchange rate fluctuations |  | (896) | (755)
Net carrying amount |  | 218,956 | 168,211
Customer relationships |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | 247,389 | 187,889
Accumulated amortization |  | (73,845) | (64,254)
Foreign currency exchange rate fluctuations |  | (916) | (777)
Net carrying amount |  | $ 172,628 | 122,858
Customer relationships | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 10 years | 10 years |
Customer relationships | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 30 years | 30 years |
Acquired technology |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 93,366 | 86,029
Accumulated amortization |  | (52,631) | (44,851)
Foreign currency exchange rate fluctuations |  | 6 | 6
Net carrying amount |  | $ 40,741 | 41,184
Acquired technology | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 5 years | 5 years |
Acquired technology | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 20 years | 20 years |
Backlog |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  |  | 1,150
Accumulated amortization |  |  | (1,078)
Foreign currency exchange rate fluctuations |  |  | 0
Net carrying amount |  |  | 72
Useful life | 4 years |  |
Trade names |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 9,400 | 7,850
Accumulated amortization |  | (5,539) | (5,794)
Foreign currency exchange rate fluctuations |  | 14 | 14
Net carrying amount |  | $ 3,875 | 2,070
Trade names | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 1 year | 1 year |
Trade names | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 12 years | 12 years |
Patents |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 2,890 | 2,930
Accumulated amortization |  | (1,578) | (1,455)
Foreign currency exchange rate fluctuations |  | 0 | 2
Net carrying amount |  | $ 1,312 | 1,477
Patents | Minimum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 2 years | 2 years |
Patents | Maximum |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life | 20 years | 20 years |
Non-compete agreements |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount |  | $ 600 | 600
Accumulated amortization |  | (200) | (50)
Foreign currency exchange rate fluctuations |  | 0 | 0
Net carrying amount |  | $ 400 | $ 550
Useful life | 3 years | 3 years |

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