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Intangible assets, net (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Other than Goodwill | Intangible assets, net, other than goodwill, consist of the following:
(In thousands) | Amortization period |  | December 31, 2018 |  | December 31, 2017
Gross amount: |  |  |  |  |  |  |
Software developed for internal use | 3 years |  | $ | 3,037 |  |  | $ | 2,972 |
Acquired proprietary technology | 5 years |  | 11,459 |  |  | 11,382 |
Customer relationships | 7-10 years |  | 34,986 |  |  | 34,986 |
Trade names | 20 years |  | 16,357 |  |  | 16,357 |
Domain names | 20 years |  | 191 |  |  | 191 |
Databases | 5-10 years |  | 31,292 |  |  | 31,292 |
Non-competition agreements | 2-5 years |  | 1,768 |  |  | 1,768 |
|  |  | 99,090 |  |  | 98,948 |
Accumulated amortization: |  |  |  |  |
Software developed for internal use |  |  | (1,282 | ) |  | (490 | )
Acquired proprietary technology |  |  | (6,987 | ) |  | (4,693 | )
Customer relationships |  |  | (14,417 | ) |  | (9,628 | )
Trade names |  |  | (2,504 | ) |  | (1,686 | )
Domain names |  |  | (29 | ) |  | (20 | )
Databases |  |  | (10,573 | ) |  | (6,964 | )
Non-competition agreements |  |  | (1,486 | ) |  | (1,113 | )
|  |  | (37,278 | ) |  | (24,594 | )
Net intangible assets: |  |  |  |  |
Software developed for internal use |  |  | 1,755 |  |  | 2,482 |
Acquired proprietary technology |  |  | 4,472 |  |  | 6,689 |
Customer relationships |  |  | 20,569 |  |  | 25,358 |
Trade names |  |  | 13,853 |  |  | 14,671 |
Domain names |  |  | 162 |  |  | 171 |
Databases |  |  | 20,719 |  |  | 24,328 |
Non-competition agreements |  |  | 282 |  |  | 655 |
|  |  | $ | 61,812 |  |  | $ | 74,354 |
Schedule of Estimated Amortization Expenses | As of December 31, 2018, estimated amortization expenses related to the Company’s intangible assets for 2019 through 2024 and thereafter are as follows:
(In thousands) |
Year | December 31, 2018
2019 | $ | 12,495 |
2020 | 12,371 |
2021 | 8,757 |
2022 | 8,008 |
2023 | 3,967 |
2024 and thereafter | 16,214 |
Total | $ | 61,812 |

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