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INTANGIBLE ASSETS | 3 Months Ended
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Mar. 31, 2021
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | ​ 6. INTANGIBLE ASSETS Intangible assets on the Company’s condensed consolidated balance sheets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ |  | ​ |  | Gross |  | Accumulated |  | Net Book |  | Gross |  | Accumulated |  | Net Book
​ | ​ | Life | ​ | Amount | ​ | amortization | ​ | Value | ​ | Amount | ​ | amortization | ​ | Value
Customer lists |  | 8 - 17 years | ​ | $ | 69,405 | ​ | $ | (24,520) | ​ | $ | 44,885 | ​ | $ | 69,833 | ​ | $ | (23,636) | ​ | $ | 46,197
Trade name |  | 10 - 19 years | ​ |  | 13,934 | ​ |  | (5,260) | ​ |  | 8,674 | ​ |  | 14,055 | ​ |  | (5,061) | ​ |  | 8,994
Design and technologies |  | 10 - 15 years | ​ |  | 15,232 | ​ |  | (4,946) | ​ |  | 10,286 | ​ |  | 15,531 | ​ |  | (4,874) | ​ |  | 10,657
Patents | ​ | 17 years | ​ |  | 24 | ​ |  | (13) | ​ |  | 11 | ​ |  | 24 | ​ |  | (13) | ​ |  | 11
Total | ​ | ​ | ​ | $ | 98,595 | ​ | $ | (34,739) | ​ | $ | 63,856 | ​ | $ | 99,443 | ​ | $ | (33,584) | ​ | $ | 65,859
​ Amortization expense for intangible assets was $1,512 and $1,441 for the three months ended March 31, 2021 and 2020, respectively. Estimated future intangible asset amortization expense as of March 31, 2021 is as follows (in thousands):
​ | ​ | ​ | ​
​ | ​ | Estimated
​ |  | Amortization Expense
Remainder of 2021 | ​ | $ | 4,512
2022 | ​ |  | 6,065
2023 | ​ |  | 6,080
2024 | ​ | ​ | 5,751
2025 | ​ |  | 5,734
2026 | ​ | ​ | 5,722
Thereafter | ​ |  | 29,992
Total estimated amortization expense | ​ | $ | 63,856
​

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- Definition The entire disclosure for all or part of the information related to 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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- References No definition available. + Details
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