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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 06, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jan. 19, 2018
Intangible assets subject to amortization |  |  |  |  |
Gross Amount |  | $ 89,490 |  | $ 89,735 |
Accumulated amortization |  | (22,702) |  | (21,381) |
Net Book Value |  | 66,788 |  | 68,354 |
Amortization expense for intangible assets |  | 1,432 | $ 884 |  |
Estimated amortization expense |  |  |  |  |
Remainder of 2019 |  | 4,289 |  |  |
2020 |  | 5,719 |  |  |
2021 |  | 5,470 |  |  |
2022 |  | 5,470 |  |  |
2023 |  | 5,389 |  |  |
2023 |  | 5,087 |  |  |
Thereafter |  | 35,364 |  |  |
Total estimated amortization expense |  | 66,788 |  |  |
TCI |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Amortizable intangible assets | $ 36,400 | 36,400 |  |  |
Maval OE Steering |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Intangible assets resulting from the acquisition |  | 3,870 |  |  | $ 3,870
Customer lists |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Gross Amount |  | 64,316 |  | 64,439 |
Accumulated amortization |  | (16,297) |  | (15,343) |
Net Book Value |  | $ 48,019 |  | 49,096 |
Customer lists | TCI |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Estimated Life | 16 years |  |  |  |
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 |  | $ 12,222 |  | 12,249 |
Accumulated amortization |  | (3,502) |  | (3,305) |
Net Book Value |  | $ 8,720 |  | 8,944 |
Trade name | TCI |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |
Estimated Life | 19 years |  |  |  |
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 |  | $ 12,928 |  | 13,023 |
Accumulated amortization |  | (2,893) |  | (2,723) |
Net Book Value |  | $ 10,035 |  | 10,300 |
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 |
Accumulated amortization |  | (10) |  | (10) |
Net Book Value |  | $ 14 |  | $ 14 |

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