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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 24, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | he components of amortized intangible assets at September 24, 2016 and December 26, 2015 were as follows:
| September 24, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 195,371 |  |  | $ | 109,595 |  |  | 13 years
Proprietary Software & Database | 3,658 |  |  | 3,056 |  |  | 8 years
Patents & Proprietary Technology | 6,998 |  |  | 3,831 |  |  | 11 years
Other | 3,886 |  |  | 3,829 |  |  | 3 years
| $ | 209,913 |  |  | $ | 120,311 |  |  |
| December 26, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 201,801 |  |  | $ | 101,614 |  |  | 13 years
Proprietary Software & Database | 3,571 |  |  | 2,966 |  |  | 8 years
Patents & Proprietary Technology | 6,815 |  |  | 3,421 |  |  | 11 years
Other | 3,752 |  |  | 3,671 |  |  | 3 years
| $ | 215,939 |  |  | $ | 111,672 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen and thirty-nine weeks ended September 24, 2016 and September 26, 2015, respectively was as follows:
Thirteen Weeks Ended |  | Thirty-nine Weeks Ended
2016 |  | 2015 |  | 2016 |  | 2015
$ | 3,964 |  |  | $ | 4,507 |  |  | $ | 12,037 |  |  | $ | 14,157 |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2016 | $ | 15,895 |
2017 | 15,390 |
2018 | 13,764 |
2019 | 12,994 |
2020 | 11,945 |
Schedule of non-amortized intangible assets | The carrying values of trade names at September 24, 2016 and December 26, 2015 were as follows:
| September 24, 2016 |  | December 26, 2015 |  | Year Acquired
Webforge | $ | 9,061 |  |  | $ | 10,430 |  |  | 2010
Valmont SM | 9,333 |  |  | 8,919 |  |  | 2014
Newmark | 11,111 |  |  | 11,111 |  |  | 2004
Ingal EPS/Ingal Civil Products | 7,387 |  |  | 8,504 |  |  | 2010
Donhad | 5,573 |  |  | 6,415 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Industrial Galvanizers | 2,313 |  |  | 2,662 |  |  | 2010
Other | 14,089 |  |  | 13,889 |  |  |
| $ | 62,867 |  |  | $ | 65,930 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of September 24, 2016 and December 26, 2015 was as follows:
| Engineered Support Structures Segment |  | Energy & Mining Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  | Total
Gross goodwill at December 26, 2015 | $ | 101,275 |  |  | $ | 99,829 |  |  | $ | 75,404 |  |  | $ | 75,941 |  |  | $ | 19,359 |  |  |  | $ | 371,808 |
Accumulated impairment losses | — |  |  | (18,670 | ) |  | — |  |  | (16,222 | ) |  | — |  |  |  | (34,892 | )
Balance at December 26, 2015 | $ | 101,275 |  |  | $ | 81,159 |  |  | $ | 75,404 |  |  | $ | 59,719 |  |  | $ | 19,359 |  |  |  | $ | 336,916 |
Foreign currency translation | (4,559 | ) |  | (4,968 | ) |  | — |  |  | 163 |  |  | 311 |  |  |  | (9,053 | )
Balance at September 24, 2016 | $ | 96,716 |  |  | $ | 76,191 |  |  | $ | 75,404 |  |  | $ | 59,882 |  |  | $ | 19,670 |  |  |  | $ | 327,863 |

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