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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jan. 12, 2016 | Dec. 31, 2015
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount | $ 49,211 |  | $ 49,211 |  |  | $ 41,137
Accumulated amortization | (13,642) |  | (13,642) |  |  | (11,153)
Total estimated amortization expense | 35,569 |  | 35,569 |  |  | 29,984
Amortization expense for intangible assets | 802 | $ 661 | 2,409 | $ 1,983 |  |
Estimated amortization expense |  |  |  |  |  |
Remainder of 2016 | 803 |  | 803 |  |  |
2017 | 3,212 |  | 3,212 |  |  |
2018 | 3,212 |  | 3,212 |  |  |
2019 | 3,212 |  | 3,212 |  |  |
2020 | 3,212 |  | 3,212 |  |  |
2021 | 2,963 |  | 2,963 |  |  |
Thereafter | 18,955 |  | 18,955 |  |  |
Total estimated amortization expense | 35,569 |  | 35,569 |  |  | 29,984
Heidrive |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Intangible assets acquired from the acquisition |  |  |  |  | $ 7,710 |
Customer lists |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount | 38,241 |  | 38,241 |  |  | 34,149
Accumulated amortization | (9,605) |  | (9,605) |  |  | (7,785)
Total estimated amortization expense | 28,636 |  | 28,636 |  |  | 26,364
Estimated amortization expense |  |  |  |  |  |
Total estimated amortization expense | 28,636 |  | $ 28,636 |  |  | 26,364
Customer lists | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 8 years |  |  |
Customer lists | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 15 years |  |  |
Trade name |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount | 6,121 |  | $ 6,121 |  |  | 4,775
Accumulated amortization | (2,163) |  | (2,163) |  |  | (1,793)
Total estimated amortization expense | 3,958 |  | 3,958 |  |  | 2,982
Estimated amortization expense |  |  |  |  |  |
Total estimated amortization expense | 3,958 |  | $ 3,958 |  |  | 2,982
Trade name | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 10 years |  |  |
Trade name | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 17 years |  |  |
Design and technologies |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount | 4,825 |  | $ 4,825 |  |  | 2,189
Accumulated amortization | (1,867) |  | (1,867) |  |  | (1,570)
Total estimated amortization expense | 2,958 |  | 2,958 |  |  | 619
Estimated amortization expense |  |  |  |  |  |
Total estimated amortization expense | 2,958 |  | $ 2,958 |  |  | 619
Design and technologies | Minimum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 8 years |  |  |
Design and technologies | Maximum |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Estimated Life |  |  | 15 years |  |  |
Patents |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |
Gross Amount | 24 |  | $ 24 |  |  | 24
Accumulated amortization | (7) |  | (7) |  |  | (5)
Total estimated amortization expense | 17 |  | 17 |  |  | 19
Estimated amortization expense |  |  |  |  |  |
Total estimated amortization expense | $ 17 |  | $ 17 |  |  | $ 19

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