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INTANGIBLE ASSETS | 6 Months Ended
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Jun. 30, 2021
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | 6. INTANGIBLE ASSETS Intangible assets on the Company’s condensed consolidated balance sheets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ |  | ​ |  | Gross |  | Accumulated |  | Net Book |  | Gross |  | Accumulated |  | Net Book
​ | ​ | Life | ​ | Amount | ​ | Amortization | ​ | Value | ​ | Amount | ​ | Amortization | ​ | Value
Customer lists |  | 8 - 17 years | ​ | $ | 69,489 | ​ | $ | (25,611) | ​ | $ | 43,878 | ​ | $ | 69,833 | ​ | $ | (23,636) | ​ | $ | 46,197
Trade name |  | 10 - 19 years | ​ |  | 13,951 | ​ |  | (5,497) | ​ |  | 8,454 | ​ |  | 14,055 | ​ |  | (5,061) | ​ |  | 8,994
Design and technologies |  | 10 - 15 years | ​ |  | 15,295 | ​ |  | (5,225) | ​ |  | 10,070 | ​ |  | 15,531 | ​ |  | (4,874) | ​ |  | 10,657
Patents | ​ | 17 years | ​ |  | 24 | ​ |  | (14) | ​ |  | 10 | ​ |  | 24 | ​ |  | (13) | ​ |  | 11
Total | ​ | ​ | ​ | $ | 98,759 | ​ | $ | (36,347) | ​ | $ | 62,412 | ​ | $ | 99,443 | ​ | $ | (33,584) | ​ | $ | 65,859
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ Amortization expense for intangible assets was $1,511 and $1,483 for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, amortization expense was $3,023 and $2,924, respectively. Estimated future intangible asset amortization expense as of June 30, 2021 is as follows (in thousands):
​ | ​ | ​ | ​
​ | ​ | Estimated
​ |  | Amortization Expense
Remainder of 2021 | ​ | $ | 3,011
2022 | ​ |  | 6,073
2023 | ​ |  | 6,087
2024 | ​ | ​ | 5,759
2025 | ​ |  | 5,741
2026 | ​ | ​ | 5,729
Thereafter | ​ |  | 30,012
Total estimated amortization expense | ​ | $ | 62,412
​ | ​ | ​ | ​
​

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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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