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GOODWILL AND INTANGIBLE ASSETS | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | GOODWILL AND INTANGIBLE ASSETS Amortized Intangible Assets The 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 |  |  |
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 |
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 |
The useful lives assigned to finite‑lived intangible assets included consideration of factors such as the Company’s past and expected experience related to customer retention rates, the remaining legal or contractual life of the underlying arrangement that resulted in the recognition of the intangible asset and the Company’s expected use of the intangible asset. (5) GOODWILL AND INTANGIBLE ASSETS (Continued) Non-amortized intangible assets Intangible assets with indefinite lives are not amortized. 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 |  |  |
In its determination of these intangible assets as indefinite‑lived, the Company considered such factors as its expected future use of the intangible asset, legal, regulatory, technological and competitive factors that may impact the useful life or value of the intangible asset and the expected costs to maintain the value of the intangible asset. The Company expects that these intangible assets will maintain their value indefinitely. Accordingly, these assets are not amortized. The Company’s trade names were tested for impairment in the third quarter of 2017. The values of each trade name was determined using the relief-from-royalty method. Based on this evaluation, no trade names were determined to be impaired. 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 |
The Company’s annual impairment test of goodwill was performed during the third quarter of 2017. As a result of that testing, the Company determined that its goodwill was not impaired, as the valuation of the reporting units exceeded their respective carrying values. The Company's offshore and other complex steel structures reporting unit with $14,464 of goodwill, is the reporting unit that did not have a substantial excess of estimated fair value over its carrying value. The Company continues to monitor changes in global market conditions, including commodity prices, which could impact future results of any of its reporting units.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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