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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 07, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount |  | $ 98,076 |  | $ 98,076 |  | $ 89,487
Accumulated amortization |  | (31,710) |  | (31,710) |  | (26,990)
Net Book Value |  | 66,366 |  | 66,366 |  | 62,497
Amortization expense for intangible assets |  | 1,499 | $ 1,429 | 4,423 | $ 4,291 |
Estimated amortization expense |  |  |  |  |  |
Remainder of 2020 |  | 1,499 |  | 1,499 |  |
2021 |  | 5,984 |  | 5,984 |  |
2022 |  | 6,031 |  | 6,031 |  |
2023 |  | 6,040 |  | 6,040 |  |
2024 |  | 5,713 |  | 5,713 |  |
Thereafter |  | 41,099 |  | 41,099 |  |
Total estimated amortization expense |  | 66,366 |  | 66,366 |  |
Dynamic Controls |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Intangible assets | $ 7,800 | 7,800 |  | 7,800 |  |
Customer lists |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount |  | 69,112 |  | 69,112 |  | 64,314
Accumulated amortization |  | (22,462) |  | (22,462) |  | (19,311)
Net Book Value |  | 46,650 |  | 46,650 |  | 45,003
Customer lists | Dynamic Controls |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life | 16 years |  |  |  |  |
Intangible assets |  | 4,400 |  | $ 4,400 |  |
Customer lists | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 8 years |  |
Customer lists | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 17 years |  |
Trade name |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount |  | 13,837 |  | $ 13,837 |  | 12,222
Accumulated amortization |  | (4,799) |  | (4,799) |  | (4,114)
Net Book Value |  | 9,038 |  | 9,038 |  | 8,108
Trade name | Dynamic Controls |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life | 18 years |  |  |  |  |
Intangible assets |  | 1,500 |  | $ 1,500 |  |
Trade name | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 10 years |  |
Trade name | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 19 years |  |
Design and technologies |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount |  | 15,103 |  | $ 15,103 |  | 12,927
Accumulated amortization |  | (4,437) |  | (4,437) |  | (3,554)
Net Book Value |  | 10,666 |  | $ 10,666 |  | 9,373
Design and technologies | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 10 years |  |
Design and technologies | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 15 years |  |
Patents |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  |  | 17 years |  |
Gross Amount |  | 24 |  | $ 24 |  | 24
Accumulated amortization |  | (12) |  | (12) |  | (11)
Net Book Value |  | $ 12 |  | $ 12 |  | $ 13

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