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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2020
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:
| December 31, 2019 |  | Additions |  | Foreign currency exchange rate fluctuations |  | September 30, 2020
| (In thousands)
Goodwill | $ | 336,539 |  |  | $ | — |  |  | $ | (83) |  |  | $ | 336,456 |
Intangible Assets, Net The carrying amounts and useful lives of intangible assets as of September 30, 2020 and December 31, 2019 were as follows:
| September 30, 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 | $ | 134,889 |  |  | $ | (60,964) |  |  | $ | (1,088) |  |  | $ | 72,837 |  |  | 10 - 30
Acquired technology | 77,029 |  |  | (42,008) |  |  | 6 |  |  | 35,027 |  |  | 5 - 20
Backlog | 1,150 |  |  | (1,006) |  |  | — |  |  | 144 |  |  | 4
Trade names | 7,650 |  |  | (5,603) |  |  | 15 |  |  | 2,062 |  |  | 6 - 12
Patents | 3,217 |  |  | (1,701) |  |  | 1 |  |  | 1,517 |  |  | 2 - 20
Total intangibles assets, net | $ | 223,935 |  |  | $ | (111,282) |  |  | $ | (1,066) |  |  | $ | 111,587 |  |  |
| December 31, 2019
| Gross carrying amount (1) |  | Accumulated amortization |  | Foreign currency exchange rate fluctuations |  | Net carrying amount |  | Useful life (years)
| (In thousands, except for years)
Customer relationships | $ | 135,234 |  |  | $ | (54,860) |  |  | $ | (1,058) |  |  | $ | 79,316 |  |  | 10 - 30
Acquired technology | 77,142 |  |  | (36,194) |  |  | 5 |  |  | 40,953 |  |  | 3 - 20
Backlog | 1,150 |  |  | (791) |  |  | — |  |  | 359 |  |  | 4
Trade names | 7,650 |  |  | (5,037) |  |  | 11 |  |  | 2,624 |  |  | 6 - 12
Patents | 3,217 |  |  | (1,603) |  |  | 1 |  |  | 1,615 |  |  | 2 - 20
Total intangibles assets, net | $ | 224,393 |  |  | $ | (98,485) |  |  | $ | (1,041) |  |  | $ | 124,867 |  |  |
_________________________________________________ (1) The differences in gross carrying amounts between periods are primarily due to the write-off of certain fully amortized intangible assets. Amortization expense of intangible assets was $4.4 million and $4.6 million for the three months ended September 30, 2020 and 2019, respectively, and $13.3 million and $14.1 million for the nine months ended September 30, 2020 and 2019, respectively. The estimated future amortization expenses for amortizable intangible assets were as follows:
| September 30, 2020
| (In thousands)
Remaining three months of 2020 | $ | 4,280 |
2021 | 16,109 |
2022 | 14,814 |
2023 | 13,718 |
2024 | 7,959 |
Thereafter | 54,707 |
Total | $ | 111,587 |

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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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