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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 19, 2019
Intangible assets subject to amortization |  |  |  |
Gross Amount | $ 89,735 | $ 50,043 |  |
Accumulated amortization | (21,381) | (17,970) |  |
Net Book Value | 68,354 | 32,073 |  |
Amortization expense for intangible assets | 3,655 | 3,219 | $ 3,204 |
Estimated amortization expense |  |  |  |
2019 | 5,736 |  |  |
2020 | 5,736 |  |  |
2021 | 5,481 |  |  |
2022 | 5,481 |  |  |
2023 | 5,400 |  |  |
Thereafter | 40,520 |  |  |
Total estimated amortization expense | 68,354 |  |  |
TCI |  |  |  |
Intangible assets subject to amortization |  |  |  |
Intangible assets resulting from the acquisition | 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 | 64,439 | 38,659 |  |
Accumulated amortization | (15,343) | (12,721) |  |
Net Book Value | $ 49,096 | 25,938 |  |
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 | $ 12,249 | 6,213 |  |
Accumulated amortization | (3,305) | (2,798) |  |
Net Book Value | $ 8,944 | 3,415 |  |
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 | $ 13,023 | 5,147 |  |
Accumulated amortization | (2,723) | (2,443) |  |
Net Book Value | $ 10,300 | 2,704 |  |
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) | (8) |  |
Net Book Value | $ 14 | $ 16 |  |

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