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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | he components of amortized intangible assets at September 30, 2017 and December 31, 2016 were as follows:
| September 30, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 200,269 |  |  | $ | 126,845 |  |  | 13 years
Proprietary Software & Database | 3,687 |  |  | 3,111 |  |  | 8 years
Patents & Proprietary Technology | 6,633 |  |  | 3,859 |  |  | 11 years
Other | 4,807 |  |  | 4,032 |  |  | 3 years
| $ | 215,396 |  |  | $ | 137,847 |  |  |
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 191,316 |  |  | $ | 111,342 |  |  | 13 years
Proprietary Software & Database | 3,616 |  |  | 3,056 |  |  | 8 years
Patents & Proprietary Technology | 6,434 |  |  | 3,420 |  |  | 11 years
Other | 3,713 |  |  | 3,668 |  |  | 3 years
| $ | 205,079 |  |  | $ | 121,486 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen and thirty-nine weeks ended September 30, 2017 and September 24, 2016, respectively was as follows:
Thirteen Weeks Ended |  | Thirty-nine Weeks Ended
2017 |  | 2016 |  | 2017 |  | 2016
4,025 |  |  | 3,964 |  |  | 11,792 |  |  | 12,037 |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2017 | $ | 15,823 |
2018 | 14,492 |
2019 | 13,718 |
2020 | 12,608 |
2021 | 10,474 |
Schedule of non-amortized intangible assets | The carrying values of trade names at September 30, 2017 and December 31, 2016 were as follows:
| September 30, 2017 |  | December 31, 2016 |  | Year Acquired
Webforge | $ | 9,362 |  |  | $ | 8,624 |  |  | 2010
Valmont SM | 9,839 |  |  | 8,765 |  |  | 2014
Newmark | 11,111 |  |  | 11,111 |  |  | 2004
Ingal EPS/Ingal Civil Products | 7,633 |  |  | 7,032 |  |  | 2010
Donhad | 5,758 |  |  | 5,305 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Industrial Galvanizers | 2,390 |  |  | 2,201 |  |  | 2010
Other | 14,448 |  |  | 13,747 |  |  |
| $ | 64,541 |  |  | $ | 60,785 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of September 30, 2017 and December 31, 2016 was as follows:
| Engineered Support Structures Segment |  | Energy & Mining Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  | Total
Balance at December 31, 2016 | $ | 94,314 |  |  | $ | 72,212 |  |  | $ | 75,404 |  |  | $ | 59,569 |  |  | $ | 19,611 |  |  |  | $ | 321,110 |
Foreign currency translation | 4,568 |  |  | 6,704 |  |  | — |  |  | 951 |  |  | 94 |  |  |  | 12,317 |
Acquisitions | 3,327 |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 3,327 |
Balance at September 30, 2017 | $ | 102,209 |  |  | $ | 78,916 |  |  | $ | 75,404 |  |  | $ | 60,520 |  |  | $ | 19,705 |  |  |  | $ | 336,754 |

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