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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 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:
| December 31, 2018 |  | Additions |  | Foreign currency exchange rate fluctuations |  | June 30, 2019
| (In thousands)
Goodwill | $ | 335,887 |  |  | $ | — |  |  | $ | (188 | ) |  | $ | 335,699 |
Intangible Assets, Net The carrying amounts and useful lives of intangible assets as of June 30, 2019 and December 31, 2018 were as follows:
| June 30, 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 |  |  | $ | (49,999 | ) |  | $ | (1,215 | ) |  | $ | 84,020 |  |  | 1 - 30
Acquired technology | 77,142 |  |  | (32,230 | ) |  | 25 |  |  | 44,937 |  |  | 3 - 20
Backlog | 1,150 |  |  | (647 | ) |  | — |  |  | 503 |  |  | 4
Trade names | 7,650 |  |  | (4,699 | ) |  | 14 |  |  | 2,965 |  |  | 1 - 12
Patents | 3,217 |  |  | (1,543 | ) |  | 2 |  |  | 1,676 |  |  | 2 - 20
Total intangibles assets, net | $ | 224,393 |  |  | $ | (89,118 | ) |  | $ | (1,174 | ) |  | $ | 134,101 |  |  |
| 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 |  |  | 1 - 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 |  |  | 1 - 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 |  |  |
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(1) | The differences in gross carrying amounts between periods are primarily due to the write-off of fully amortized intangible assets.
Amortization expense of intangible assets was $4.7 million and $6.0 million for the three months ended June 30, 2019 and 2018, respectively. Amortization expense of intangible assets was $9.5 million and $12.0 million for the six months ended June 30, 2019 and 2018, respectively. The estimated future amortization expenses for amortizable intangible assets were as follows:
| June 30, 2019
| (In thousands)
Remaining six months of 2019 | $ | 9,171 |
2020 | 17,499 |
2021 | 16,171 |
2022 | 14,819 |
2023 | 13,705 |
Thereafter | 62,736 |
Total | $ | 134,101 |

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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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