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GOODWILL AND INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of components of amortized intangible assets | he components of amortized intangible assets at June 30, 2018 and December 30, 2017 were as follows:
| June 30, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 188,767 |  |  | $ | 126,904 |  |  | 13 years
Proprietary Software & Database | 3,589 |  |  | 3,075 |  |  | 8 years
Patents & Proprietary Technology | 7,225 |  |  | 4,238 |  |  | 11 years
Other | 4,496 |  |  | 3,789 |  |  | 3 years
| $ | 204,077 |  |  | $ | 138,006 |  |  |
| December 30, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Weighted Average Life
Customer Relationships | $ | 200,810 |  |  | $ | 131,062 |  |  | 13 years
Proprietary Software & Database | 3,671 |  |  | 3,107 |  |  | 8 years
Patents & Proprietary Technology | 6,693 |  |  | 3,999 |  |  | 11 years
Other | 4,861 |  |  | 4,121 |  |  | 3 years
| $ | 216,035 |  |  | $ | 142,289 |  |  |
Schedule of amortization expense for intangible assets | Amortization expense for intangible assets for the thirteen and twenty-six weeks ended June 30, 2018 and July 1, 2017, respectively was as follows:
Thirteen Weeks Ended |  | Twenty-six Weeks Ended
2018 |  | 2017 |  | 2018 |  | 2017
3,572 |  |  | 3,903 |  |  | 7,455 |  |  | 7,767 |
Schedule of future estimated amortization expense | Estimated annual amortization expense related to finite‑lived intangible assets is as follows:
| Estimated Amortization Expense
2018 | $ | 14,187 |
2019 | 12,903 |
2020 | 11,804 |
2021 | 9,748 |
2022 | 7,573 |
Schedule of non-amortized intangible assets | The carrying values of trade names at June 30, 2018 and December 30, 2017 were as follows:
| June 30, 2018 |  | December 30, 2017 |  | Year Acquired
Newmark | $ | 11,111 |  |  | $ | 11,111 |  |  | 2004
Valmont SM | 9,717 |  |  | 9,973 |  |  | 2014
Webforge | 9,230 |  |  | 9,432 |  |  | 2010
Ingal EPS/Ingal Civil Products | 7,526 |  |  | 7,690 |  |  | 2010
Shakespeare | 4,000 |  |  | 4,000 |  |  | 2014
Other | 16,894 |  |  | 22,647 |  |  |
| $ | 58,478 |  |  | $ | 64,853 |  |  |
Schedule of carrying amount of goodwill | The carrying amount of goodwill by segment as of June 30, 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 | — |  |  | — |  |  | — |  |  | 3,922 |  |  | — |  |  | 3,922 |
Divestiture of grinding media | — |  |  | — |  |  | — |  |  | — |  |  | (15,814 | ) |  | (15,814 | )
Foreign currency translation | (3,443 | ) |  | (380 | ) |  | (527 | ) |  | (116 | ) |  | — |  |  | (4,466 | )
Balance at June 30, 2018 | $ | 147,963 |  |  | $ | 89,868 |  |  | $ | 59,947 |  |  | $ | 23,584 |  |  | $ | — |  |  | $ | 321,362 |

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