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GOODWILL AND OTHER INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND OTHER INTANGIBLE ASSETS | 7. GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill
(in thousands) | 2020 |  | 2019
January 1, | $ | 79,039 |  |  | $ | 72,858 |
Acquisition | — |  |  | 6,179 |
Currency translation adjustments | 192 |  |  | 2 |
December 31, | $ | 79,231 |  |  | $ | 79,039 |
Intangibles Intangible assets are recorded at cost and amortized using the straight-line method over their estimated useful lives as follows:
|  |  | December 31, 2020
(in thousands) | Useful Lives |  | Cost |  | Accumulated Amortization |  | Net Book Value (1)
Client-related | 4-10 years |  | $ | 63,168 |  |  | $ | (55,877) |  |  | $ | 7,291 |
Technology | 2-10 years |  | 64,843 |  |  | (56,386) |  |  | 8,457 |
Other | 1-5 years |  | 5,361 |  |  | (5,361) |  |  | — |
|  |  | $ | 133,372 |  |  | $ | (117,624) |  |  | $ | 15,748 |
(1) Included in other long-term assets.
|  |  | December 31, 2019
(in thousands) | Useful Lives |  | Cost |  | Accumulated Amortization |  | Net Book Value (1)
Client-related | 4-10 years |  | $ | 63,140 |  |  | $ | (54,368) |  |  | $ | 8,772 |
Technology | 2-10 years |  | 64,843 |  |  | (53,898) |  |  | 10,945 |
Other | 1-5 years |  | 5,361 |  |  | (5,361) |  |  | — |
|  |  | $ | 133,344 |  |  | $ | (113,627) |  |  | $ | 19,717 |
(1) Included in other long-term assets. Amortization of intangible assets was:
(in thousands) | 2020 |  | 2019 |  | 2018
Cost of revenue | $ | 2,487 |  |  | $ | 3,500 |  |  | $ | 5,027 |
Selling and marketing | 1,483 |  |  | 3,125 |  |  | 6,416 |
| $ | 3,970 |  |  | $ | 6,625 |  |  | $ | 11,443 |
Future estimated amortization expense related to intangible assets:
(in thousands) | December 31, 2020
2021 | $ | 3,657 |
2022 | 3,557 |
2023 | 3,289 |
2024 | 2,520 |
2025 and after | 2,725 |
| $ | 15,748 |

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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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