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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The following table represents changes in the carrying amount of goodwill:
|  |  |  |  | (In thousands)
Balance as of December 31, 2019 |  |  |  |  | $ | 336,539 |
Additions (1) |  |  |  |  | 161,117 |
Foreign currency exchange rate fluctuations |  |  |  |  | 1,653 |
Balance as of December 31, 2020 |  |  |  |  | 499,309 |
Additions (1) |  |  |  |  | 242,964 |
Measurement period adjustments (1) |  |  |  |  | (2,321) |
Foreign currency exchange rate fluctuations |  |  |  |  | (1,052) |
Balance as of December 31, 2021 |  |  |  |  | $ | 738,900 |
_________________________________________________ (1) Refer to Note 2, Business Combinations, for further information. Intangible Assets, Net The carrying amounts and useful lives of intangible assets as of December 31, 2021 and 2020 were as follows:
| December 31, 2021
| Gross carrying amount (1) |  | Accumulated amortization |  | Foreign currency exchange rate fluctuations |  | Net carrying amount |  | Useful life (years)
| (In thousands, except for years)
Customer relationships | $ | 309,989 |  |  | $ | (78,093) |  |  | $ | (933) |  |  | $ | 230,963 |  |  | 10 - 30
Acquired technology | 95,466 |  |  | (55,859) |  |  | 6 |  |  | 39,613 |  |  | 4 - 20
Backlog | 1,800 |  |  | — |  |  | — |  |  | 1,800 |  |  | 2
Trade names | 9,200 |  |  | (5,600) |  |  | 14 |  |  | 3,614 |  |  | 5 - 12
Patents | 2,462 |  |  | (1,186) |  |  | — |  |  | 1,276 |  |  | 2 - 20
Non-compete agreements | 600 |  |  | (250) |  |  | — |  |  | 350 |  |  | 3
Total intangibles assets, net | $ | 419,517 |  |  | $ | (140,988) |  |  | $ | (913) |  |  | $ | 277,616 |  |  |
| December 31, 2020
| Gross carrying amount (1) |  | Accumulated amortization |  | Foreign currency exchange rate fluctuations |  | Net carrying amount |  | Useful life (years)
| (In thousands, except for years)
Customer relationships | $ | 187,889 |  |  | $ | (64,254) |  |  | $ | (777) |  |  | $ | 122,858 |  |  | 10 - 30
Acquired technology | 86,029 |  |  | (44,851) |  |  | 6 |  |  | 41,184 |  |  | 5 - 20
Backlog | 1,150 |  |  | (1,078) |  |  | — |  |  | 72 |  |  | 4
Trade names | 7,850 |  |  | (5,794) |  |  | 14 |  |  | 2,070 |  |  | 1 - 12
Patents | 2,930 |  |  | (1,455) |  |  | 2 |  |  | 1,477 |  |  | 2 - 20
Non-compete agreements | 600 |  |  | (50) |  |  | — |  |  | 550 |  |  | 3
Total intangibles assets, net | $ | 286,448 |  |  | $ | (117,482) |  |  | $ | (755) |  |  | $ | 168,211 |  |  |
_________________________________________________ (1) The differences in gross carrying amounts between periods are primarily due to additions of intangible assets in connection with acquisitions, partially offset by the write-off of certain fully amortized intangible assets. Amortization expense of intangible assets was $26.5 million, $19.7 million, and $18.9 million for the years ended December 31, 2021, 2020, and 2019, respectively. The estimated future amortization expenses for amortizable intangible assets were as follows:
| December 31, 2021
| (In thousands)
2022 | $ | 35,400 |
2023 | 31,486 |
2024 | 22,985 |
2025 | 20,859 |
2026 | 17,885 |
Thereafter | 149,001 |
Total | $ | 277,616 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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