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GOODWILL AND INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 27, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | The components of amortized intangible assets at March 27, 2021 and December 26, 2020 were as follows:
| March 27, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 237,388 |  |  | $ | 160,088 |  |  | 13 years
Patents & Proprietary Technology | 25,823 |  |  | 8,642 |  |  | 14 years
Other | 7,484 |  |  | 7,211 |  |  | 4 years
| $ | 270,695 |  |  | $ | 175,941 |  |  |
| December 26, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 237,232 |  |  | $ | 155,760 |  |  | 13 years
Patents & Proprietary Technology | 26,208 |  |  | 8,301 |  |  | 14 years
Other | 7,602 |  |  | 6,786 |  |  | 4 years
| $ | 271,042 |  |  | $ | 170,847 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen weeks ended March 27, 2021 and March 28, 2020, respectively was as follows:
Thirteen weeks ended |  |
2021 |  | 2020 |  |  |  |
$ | 4,232 |  |  | $ | 4,593 |  |  |  |  |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite-lived intangible assets is as follows:
| Estimated Amortization Expense
2021 | $ | 15,976 |
2022 | 13,337 |
2023 | 11,503 |
2024 | 9,587 |
2025 | 8,153 |
Schedule of non-amortized intangible assets | The carrying value of trade names at March 27, 2021 and December 26, 2020 are as follows:
| March 27, 2021 |  | December 26, 2020 |  | Year Acquired
Newmark | $ | 11,111 |  |  | $ | 11,111 |  |  | 2004
Webforge | 8,104 |  |  | 7,972 |  |  | 2010
Convert Italia S.p.A | 8,845 |  |  | 9,137 |  |  | 2018
Valmont SM | 8,443 |  |  | 8,720 |  |  | 2014
Ingal EPS/Ingal Civil Products | 7,857 |  |  | 7,730 |  |  | 2010
Walpar | 3,500 |  |  | 3,500 |  |  | 2018
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Other | 14,925 |  |  | 14,828 |  |  | Various
| $ | 66,785 |  |  | $ | 66,998 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of March 27, 2021 and December 26, 2020 was as follows:
| Engineered Support Structures Segment |  | Utility Support Structures Segment |  | Coatings Segment |  | Irrigation Segment |  |  |  | Total
Gross Balance December 26, 2020 | $ | 232,323 |  |  | $ | 135,335 |  |  | $ | 94,309 |  |  | $ | 30,177 |  |  |  |  | $ | 492,144 |
Accumulated impairment losses | (31,245) |  |  | (14,355) |  |  | (16,222) |  |  | — |  |  |  |  | (61,822) |
Balance at December 26, 2020 | 201,078 |  |  | 120,980 |  |  | 78,087 |  |  | 30,177 |  |  |  |  | 430,322 |
Foreign currency translation | 1,204 |  |  | (1,438) |  |  | 207 |  |  | (368) |  |  |  |  | (395) |
Balance at March 27, 2021 | $ | 202,282 |  |  | $ | 119,542 |  |  | $ | 78,294 |  |  | $ | 29,809 |  |  |  |  | $ | 429,927 |

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