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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
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, 2017 |  |  |  |  | $ | 337,751 |
Additions |  |  |  |  | — |
Foreign currency exchange rate fluctuations |  |  |  |  | (1,864) |
Balance as of December 31, 2018 |  |  |  |  | 335,887 |
Additions |  |  |  |  | — |
Foreign currency exchange rate fluctuations |  |  |  |  | 652 |
Balance as of December 31, 2019 |  |  |  |  | $ | 336,539 |
Intangible Assets, Net The carrying amounts and useful lives of intangible assets as of December 31, 2019 and 2018 were as follows:
| 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 |  |  |
| December 31, 2018 |  |  |  |  |  |  |  |
| 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 |  |  | $ | (45,029) |  |  | $ | (1,185) |  |  | $ | 89,020 |  |  | 10 - 30
Acquired technology | 78,122 |  |  | (29,206) |  |  | 42 |  |  | 48,958 |  |  | 3 - 20
Backlog | 21,350 |  |  | (20,703) |  |  | — |  |  | 647 |  |  | 1 - 4
Trade names | 7,650 |  |  | (4,361) |  |  | 17 |  |  | 3,306 |  |  | 6 - 12
Patents | 3,239 |  |  | (1,488) |  |  | 4 |  |  | 1,755 |  |  | 2 - 20
Non-compete agreements | 1,900 |  |  | (1,900) |  |  | — |  |  | — |  |  | 3
Total intangibles assets, net | $ | 247,495 |  |  | $ | (102,687) |  |  | $ | (1,122) |  |  | $ | 143,686 |  |  |
_________________________________________________ (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 $18.9 million, $23.8 million, and $25.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. The estimated future amortization expenses for amortizable intangible assets were as follows:
| December 31, 2019
| (In thousands)
2020 | $ | 17,502 |
2021 | 16,180 |
2022 | 14,832 |
2023 | 13,724 |
2024 | 7,972 |
Thereafter |  | 54,657 |
Total |  | $ | 124,867 |

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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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