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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 12, 2016
Intangible assets subject to amortization |  |  |  |
Gross Amount | $ 48,467 | $ 41,137 |  |
Accumulated amortization | (14,215) | (11,153) |  |
Net Book Value | 34,252 | 29,984 |  |
Amortization expense for intangible assets | 3,204 | 2,644 | $ 2,714 |
Estimated amortization expense |  |  |  |
2017 | 3,162 |  |  |
2018 | 3,162 |  |  |
2019 | 3,162 |  |  |
2020 | 3,162 |  |  |
2021 | 2,929 |  |  |
Thereafter | 18,675 |  |  |
Net Book Value | $ 34,252 | 29,984 |  |
Heidrive |  |  |  |
Intangible assets subject to amortization |  |  |  |
Estimated Life | 14 years 6 months |  |  |
Intangible assets acquired from the acquisition | $ 7,710 |  |  | $ 7,710
Customer lists |  |  |  |
Intangible assets subject to amortization |  |  |  |
Gross Amount | 37,868 | 34,149 |  |
Accumulated amortization | (10,087) | (7,785) |  |
Net Book Value | 27,781 | 26,364 |  |
Estimated amortization expense |  |  |  |
Net Book Value | $ 27,781 | 26,364 |  |
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 | $ 6,038 | 4,775 |  |
Accumulated amortization | (2,281) | (1,793) |  |
Net Book Value | 3,757 | 2,982 |  |
Estimated amortization expense |  |  |  |
Net Book Value | $ 3,757 | 2,982 |  |
Trade name | Minimum |  |  |  |
Intangible assets subject to amortization |  |  |  |
Estimated Life | 10 years |  |  |
Trade name | Maximum |  |  |  |
Intangible assets subject to amortization |  |  |  |
Estimated Life | 12 years |  |  |
Design and technologies |  |  |  |
Intangible assets subject to amortization |  |  |  |
Gross Amount | $ 4,537 | 2,189 |  |
Accumulated amortization | (1,840) | (1,570) |  |
Net Book Value | 2,697 | 619 |  |
Estimated amortization expense |  |  |  |
Net Book Value | $ 2,697 | 619 |  |
Design and technologies | Minimum |  |  |  |
Intangible assets subject to amortization |  |  |  |
Estimated Life | 10 years |  |  |
Design and technologies | Maximum |  |  |  |
Intangible assets subject to amortization |  |  |  |
Estimated Life | 12 years |  |  |
Patents |  |  |  |
Intangible assets subject to amortization |  |  |  |
Gross Amount | $ 24 | 24 |  |
Accumulated amortization | (7) | (5) |  |
Net Book Value | $ 17 | 19 |  |
Estimated Life | 17 years |  |  |
Estimated amortization expense |  |  |  |
Net Book Value | $ 17 | $ 19 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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