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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | he components of amortized intangible assets at September 29, 2018 and December 30, 2017 were as follows:
| September 29, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 218,492 |  |  | $ | 130,082 |  |  | 13 years
Patents & Proprietary Technology | 23,846 |  |  | 4,440 |  |  | 14 years
Other | 7,991 |  |  | 6,868 |  |  | 5 years
| $ | 250,329 |  |  | $ | 141,390 |  |  |
| December 30, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 200,810 |  |  | $ | 131,062 |  |  | 13 years
Patents & Proprietary Technology | 6,693 |  |  | 3,999 |  |  | 11 years
Other | 8,532 |  |  | 7,228 |  |  | 5 years
| $ | 216,035 |  |  | $ | 142,289 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen and thirty-nine weeks ended September 29, 2018 and September 30, 2017, respectively was as follows:
Thirteen Weeks Ended |  | Thirty-nine Weeks Ended
2018 |  | 2017 |  | 2018 |  | 2017
3,721 |  |  | 4,025 |  |  | 11,176 |  |  | 11,792 |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2018 | $ | 15,264 |
2019 | 16,081 |
2020 | 14,969 |
2021 | 12,885 |
2022 | 10,740 |
Schedule of non-amortized intangible assets | The carrying values of trade names at September 29, 2018 and December 30, 2017 were as follows:
| September 29, 2018 |  | December 30, 2017 |  | Year Acquired
Newmark | $ | 11,111 |  |  | $ | 11,111 |  |  | 2004
Valmont SM | 8,283 |  |  | 9,973 |  |  | 2014
Webforge | 9,105 |  |  | 9,432 |  |  | 2010
Convert Italia S.p.A | 8,703 |  |  | — |  |  | 2018
Ingal EPS/Ingal Civil Products | 7,424 |  |  | 7,690 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Other | 21,128 |  |  | 22,647 |  |  |
| $ | 69,754 |  |  | $ | 64,853 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of September 29, 2018 and December 30, 2017 was as follows:
| Engineered Support Structures Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  | Other |  | Total
Gross balance at December 30, 2017 | $ | 170,076 |  |  | $ | 90,248 |  |  | $ | 76,696 |  |  | $ | 19,778 |  |  | $ | 15,814 |  |  | $ | 372,612 |
Accumulated impairment losses | (18,670 | ) |  | — |  |  | (16,222 | ) |  | — |  |  | — |  |  | (34,892 | )
Balance at December 30, 2017 | 151,406 |  |  | 90,248 |  |  | 60,474 |  |  | 19,778 |  |  | 15,814 |  |  | 337,720 |
Acquisitions | 40,919 |  |  | 41,432 |  |  | — |  |  | 5,503 |  |  | — |  |  | 87,854 |
Asset impairment | — |  |  | (14,355 | ) |  | — |  |  | — |  |  | — |  |  | (14,355 | )
Divestiture of grinding media | — |  |  | — |  |  | — |  |  | — |  |  | (15,814 | ) |  | (15,814 | )
Foreign currency translation | (4,797 | ) |  | (489 | ) |  | (380 | ) |  | (145 | ) |  | — |  |  | (5,811 | )
Balance at September 29, 2018 | $ | 187,528 |  |  | $ | 116,836 |  |  | $ | 60,094 |  |  | $ | 25,136 |  |  | $ | — |  |  | $ | 389,594 |

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