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INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2020
INTANGIBLE ASSETS |
INTANGIBLE ASSETS | 7. INTANGIBLE ASSETS Intangible assets on the Company’s condensed consolidated balance sheets consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | September 30, 2020 | ​ | December 31, 2019
​ |  | ​ |  | Gross |  | Accumulated |  | Net Book |  | Gross |  | Accumulated |  | Net Book
​ | ​ | Life | ​ | Amount | ​ | amortization | ​ | Value | ​ | Amount | ​ | amortization | ​ | Value
Customer lists |  | 8 - 17 years | ​ | $ | 69,112 | ​ | $ | (22,462) | ​ | $ | 46,650 | ​ | $ | 64,314 | ​ | $ | (19,311) | ​ | $ | 45,003
Trade name |  | 10 - 19 years | ​ |  | 13,837 | ​ |  | (4,799) | ​ |  | 9,038 | ​ |  | 12,222 | ​ |  | (4,114) | ​ |  | 8,108
Design and technologies |  | 10 - 15 years | ​ |  | 15,103 | ​ |  | (4,437) | ​ |  | 10,666 | ​ |  | 12,927 | ​ |  | (3,554) | ​ |  | 9,373
Patents | ​ | 17 years | ​ |  | 24 | ​ |  | (12) | ​ |  | 12 | ​ |  | 24 | ​ |  | (11) | ​ |  | 13
Total | ​ | ​ | ​ | $ | 98,076 | ​ | $ | (31,710) | ​ | $ | 66,366 | ​ | $ | 89,487 | ​ | $ | (26,990) | ​ | $ | 62,497
​ Intangible assets resulting from the acquisition of Dynamic Controls were $7,800 (Note 2). The intangible assets acquired consist of customer lists, technology and a trade name. Amortization expense for intangible assets was $1,499 and $1,429 for the quarters ended September 30, 2020 and 2019, respectively. For the nine months ended September 30, 2020 and 2019, amortization expense was $4,423 and $4,291, respectively. Estimated future intangible asset amortization expense as of September 30, 2020 is as follows (in thousands): ​
​ | ​ | ​ | ​
​ | ​ | Estimated
​ |  | Amortization Expense
Remainder of 2020 | ​ | $ | 1,499
2021 | ​ |  | 5,984
2022 | ​ |  | 6,031
2023 | ​ | ​ | 6,040
2024 | ​ |  | 5,713
Thereafter | ​ |  | 41,099
Total estimated amortization expense | ​ | $ | 66,366
​

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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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